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<title>[186507] branches/safari-600.1.4.17-branch/Source/WebCore</title>
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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/186507">186507</a></dd>
<dt>Author</dt> <dd>matthew_hanson@apple.com</dd>
<dt>Date</dt> <dd>2015-07-08 09:41:44 -0700 (Wed, 08 Jul 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>Merge <a href="http://trac.webkit.org/projects/webkit/changeset/186384">r186384</a>. rdar://problem/21708281</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branchessafari6001417branchSourceWebCoreChangeLog">branches/safari-600.1.4.17-branch/Source/WebCore/ChangeLog</a></li>
<li><a href="#branchessafari6001417branchSourceWebCorehtmlcanvasWebGLRenderingContextcpp">branches/safari-600.1.4.17-branch/Source/WebCore/html/canvas/WebGLRenderingContext.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#branchessafari6001417branchSourceWebCorehtmlcanvasWebGLRenderingContextBasecpp">branches/safari-600.1.4.17-branch/Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="branchessafari6001417branchSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-600.1.4.17-branch/Source/WebCore/ChangeLog (186506 => 186507)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-600.1.4.17-branch/Source/WebCore/ChangeLog 2015-07-08 16:41:39 UTC (rev 186506)
+++ branches/safari-600.1.4.17-branch/Source/WebCore/ChangeLog 2015-07-08 16:41:44 UTC (rev 186507)
</span><span class="lines">@@ -1,5 +1,20 @@
</span><span class="cx"> 2015-07-08 Matthew Hanson <matthew_hanson@apple.com>
</span><span class="cx">
</span><ins>+ Merge r186384. rdar://problem/21708281
+
+ 2015-07-06 Dean Jackson <dino@apple.com>
+
+ Memory corruption in WebGLRenderingContext::simulateVertexAttrib0
+ https://bugs.webkit.org/show_bug.cgi?id=146652
+ <rdar://problem/21567767>
+
+ Follow-up fix.
+
+ * html/canvas/WebGLRenderingContextBase.cpp:
+ (WebCore::WebGLRenderingContextBase::simulateVertexAttrib0):
+
+2015-07-08 Matthew Hanson <matthew_hanson@apple.com>
+
</ins><span class="cx"> Merge r186380. rdar://problem/21708281
</span><span class="cx">
</span><span class="cx"> 2015-07-06 Dean Jackson <dino@apple.com>
</span></span></pre></div>
<a id="branchessafari6001417branchSourceWebCorehtmlcanvasWebGLRenderingContextcpp"></a>
<div class="modfile"><h4>Modified: branches/safari-600.1.4.17-branch/Source/WebCore/html/canvas/WebGLRenderingContext.cpp (186506 => 186507)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-600.1.4.17-branch/Source/WebCore/html/canvas/WebGLRenderingContext.cpp 2015-07-08 16:41:39 UTC (rev 186506)
+++ branches/safari-600.1.4.17-branch/Source/WebCore/html/canvas/WebGLRenderingContext.cpp 2015-07-08 16:41:44 UTC (rev 186507)
</span><span class="lines">@@ -5907,7 +5907,9 @@
</span><span class="cx"> return false;
</span><span class="cx"> m_vertexAttrib0UsedBefore = true;
</span><span class="cx"> m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, m_vertexAttrib0Buffer->object());
</span><del>- Checked<GC3Dsizeiptr, RecordOverflow> bufferDataSize = (numVertex + 1) * 4 * sizeof(GC3Dfloat);
</del><ins>+ Checked<GC3Dsizeiptr, RecordOverflow> bufferDataSize(numVertex);
+ bufferDataSize += 1;
+ bufferDataSize *= Checked<GC3Dsizeiptr, RecordOverflow>(4 * sizeof(GC3Dfloat));
</ins><span class="cx"> if (bufferDataSize.hasOverflowed())
</span><span class="cx"> return false;
</span><span class="cx"> if (bufferDataSize.unsafeGet() > m_vertexAttrib0BufferSize) {
</span></span></pre></div>
<a id="branchessafari6001417branchSourceWebCorehtmlcanvasWebGLRenderingContextBasecppfromrev186506branchessafari6001417branchSourceWebCorehtmlcanvasWebGLRenderingContextcpp"></a>
<div class="copfile"><h4>Copied: branches/safari-600.1.4.17-branch/Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp (from rev 186506, branches/safari-600.1.4.17-branch/Source/WebCore/html/canvas/WebGLRenderingContext.cpp) (0 => 186507)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-600.1.4.17-branch/Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp (rev 0)
+++ branches/safari-600.1.4.17-branch/Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp 2015-07-08 16:41:44 UTC (rev 186507)
</span><span class="lines">@@ -0,0 +1,5050 @@
</span><ins>+/*
+ * Copyright (C) 2015 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#if ENABLE(WEBGL)
+#include "WebGLRenderingContextBase.h"
+
+#include "ANGLEInstancedArrays.h"
+#include "CachedImage.h"
+#include "DOMWindow.h"
+#include "Document.h"
+#include "EXTBlendMinMax.h"
+#include "EXTFragDepth.h"
+#include "EXTShaderTextureLOD.h"
+#include "EXTTextureFilterAnisotropic.h"
+#include "EXTsRGB.h"
+#include "ExceptionCode.h"
+#include "Extensions3D.h"
+#include "Frame.h"
+#include "FrameLoader.h"
+#include "FrameLoaderClient.h"
+#include "FrameView.h"
+#include "GraphicsContext.h"
+#include "HTMLCanvasElement.h"
+#include "HTMLImageElement.h"
+#include "HTMLVideoElement.h"
+#include "ImageBuffer.h"
+#include "ImageData.h"
+#include "IntSize.h"
+#include "Logging.h"
+#include "MainFrame.h"
+#include "NotImplemented.h"
+#include "OESElementIndexUint.h"
+#include "OESStandardDerivatives.h"
+#include "OESTextureFloat.h"
+#include "OESTextureFloatLinear.h"
+#include "OESTextureHalfFloat.h"
+#include "OESTextureHalfFloatLinear.h"
+#include "OESVertexArrayObject.h"
+#include "Page.h"
+#include "RenderBox.h"
+#include "Settings.h"
+#include "WebGL2RenderingContext.h"
+#include "WebGLActiveInfo.h"
+#include "WebGLBuffer.h"
+#include "WebGLCompressedTextureATC.h"
+#include "WebGLCompressedTexturePVRTC.h"
+#include "WebGLCompressedTextureS3TC.h"
+#include "WebGLContextAttributes.h"
+#include "WebGLContextEvent.h"
+#include "WebGLContextGroup.h"
+#include "WebGLDebugRendererInfo.h"
+#include "WebGLDebugShaders.h"
+#include "WebGLDepthTexture.h"
+#include "WebGLDrawBuffers.h"
+#include "WebGLFramebuffer.h"
+#include "WebGLLoseContext.h"
+#include "WebGLProgram.h"
+#include "WebGLRenderbuffer.h"
+#include "WebGLRenderingContext.h"
+#include "WebGLShader.h"
+#include "WebGLShaderPrecisionFormat.h"
+#include "WebGLTexture.h"
+#include "WebGLUniformLocation.h"
+
+#include <runtime/JSCInlines.h>
+#include <runtime/TypedArrayInlines.h>
+#include <runtime/Uint32Array.h>
+#include <wtf/CheckedArithmetic.h>
+#include <wtf/StdLibExtras.h>
+#include <wtf/text/CString.h>
+#include <wtf/text/StringBuilder.h>
+
+namespace WebCore {
+
+const double secondsBetweenRestoreAttempts = 1.0;
+const int maxGLErrorsAllowedToConsole = 256;
+
+namespace {
+
+ Platform3DObject objectOrZero(WebGLObject* object)
+ {
+ return object ? object->object() : 0;
+ }
+
+ GC3Dint clamp(GC3Dint value, GC3Dint min, GC3Dint max)
+ {
+ if (value < min)
+ value = min;
+ if (value > max)
+ value = max;
+ return value;
+ }
+
+ // Return true if a character belongs to the ASCII subset as defined in
+ // GLSL ES 1.0 spec section 3.1.
+ bool validateCharacter(unsigned char c)
+ {
+ // Printing characters are valid except " $ ` @ \ ' DEL.
+ if (c >= 32 && c <= 126
+ && c != '"' && c != '$' && c != '`' && c != '@' && c != '\\' && c != '\'')
+ return true;
+ // Horizontal tab, line feed, vertical tab, form feed, carriage return
+ // are also valid.
+ if (c >= 9 && c <= 13)
+ return true;
+ return false;
+ }
+
+ bool isPrefixReserved(const String& name)
+ {
+ if (name.startsWith("gl_") || name.startsWith("webgl_") || name.startsWith("_webgl_"))
+ return true;
+ return false;
+ }
+
+ // Strips comments from shader text. This allows non-ASCII characters
+ // to be used in comments without potentially breaking OpenGL
+ // implementations not expecting characters outside the GLSL ES set.
+ class StripComments {
+ public:
+ StripComments(const String& str)
+ : m_parseState(BeginningOfLine)
+ , m_sourceString(str)
+ , m_length(str.length())
+ , m_position(0)
+ {
+ parse();
+ }
+
+ String result()
+ {
+ return m_builder.toString();
+ }
+
+ private:
+ bool hasMoreCharacters() const
+ {
+ return (m_position < m_length);
+ }
+
+ void parse()
+ {
+ while (hasMoreCharacters()) {
+ process(current());
+ // process() might advance the position.
+ if (hasMoreCharacters())
+ advance();
+ }
+ }
+
+ void process(UChar);
+
+ bool peek(UChar& character) const
+ {
+ if (m_position + 1 >= m_length)
+ return false;
+ character = m_sourceString[m_position + 1];
+ return true;
+ }
+
+ UChar current() const
+ {
+ ASSERT_WITH_SECURITY_IMPLICATION(m_position < m_length);
+ return m_sourceString[m_position];
+ }
+
+ void advance()
+ {
+ ++m_position;
+ }
+
+ bool isNewline(UChar character) const
+ {
+ // Don't attempt to canonicalize newline related characters.
+ return (character == '\n' || character == '\r');
+ }
+
+ void emit(UChar character)
+ {
+ m_builder.append(character);
+ }
+
+ enum ParseState {
+ // Have not seen an ASCII non-whitespace character yet on
+ // this line. Possible that we might see a preprocessor
+ // directive.
+ BeginningOfLine,
+
+ // Have seen at least one ASCII non-whitespace character
+ // on this line.
+ MiddleOfLine,
+
+ // Handling a preprocessor directive. Passes through all
+ // characters up to the end of the line. Disables comment
+ // processing.
+ InPreprocessorDirective,
+
+ // Handling a single-line comment. The comment text is
+ // replaced with a single space.
+ InSingleLineComment,
+
+ // Handling a multi-line comment. Newlines are passed
+ // through to preserve line numbers.
+ InMultiLineComment
+ };
+
+ ParseState m_parseState;
+ String m_sourceString;
+ unsigned m_length;
+ unsigned m_position;
+ StringBuilder m_builder;
+ };
+
+ void StripComments::process(UChar c)
+ {
+ if (isNewline(c)) {
+ // No matter what state we are in, pass through newlines
+ // so we preserve line numbers.
+ emit(c);
+
+ if (m_parseState != InMultiLineComment)
+ m_parseState = BeginningOfLine;
+
+ return;
+ }
+
+ UChar temp = 0;
+ switch (m_parseState) {
+ case BeginningOfLine:
+ if (WTF::isASCIISpace(c)) {
+ emit(c);
+ break;
+ }
+
+ if (c == '#') {
+ m_parseState = InPreprocessorDirective;
+ emit(c);
+ break;
+ }
+
+ // Transition to normal state and re-handle character.
+ m_parseState = MiddleOfLine;
+ process(c);
+ break;
+
+ case MiddleOfLine:
+ if (c == '/' && peek(temp)) {
+ if (temp == '/') {
+ m_parseState = InSingleLineComment;
+ emit(' ');
+ advance();
+ break;
+ }
+
+ if (temp == '*') {
+ m_parseState = InMultiLineComment;
+ // Emit the comment start in case the user has
+ // an unclosed comment and we want to later
+ // signal an error.
+ emit('/');
+ emit('*');
+ advance();
+ break;
+ }
+ }
+
+ emit(c);
+ break;
+
+ case InPreprocessorDirective:
+ // No matter what the character is, just pass it
+ // through. Do not parse comments in this state. This
+ // might not be the right thing to do long term, but it
+ // should handle the #error preprocessor directive.
+ emit(c);
+ break;
+
+ case InSingleLineComment:
+ // The newline code at the top of this function takes care
+ // of resetting our state when we get out of the
+ // single-line comment. Swallow all other characters.
+ break;
+
+ case InMultiLineComment:
+ if (c == '*' && peek(temp) && temp == '/') {
+ emit('*');
+ emit('/');
+ m_parseState = MiddleOfLine;
+ advance();
+ break;
+ }
+
+ // Swallow all other characters. Unclear whether we may
+ // want or need to just emit a space per character to try
+ // to preserve column numbers for debugging purposes.
+ break;
+ }
+ }
+} // namespace anonymous
+
+class WebGLRenderingContextLostCallback : public GraphicsContext3D::ContextLostCallback {
+ WTF_MAKE_FAST_ALLOCATED;
+public:
+ explicit WebGLRenderingContextLostCallback(WebGLRenderingContextBase* cb) : m_context(cb) { }
+ virtual void onContextLost() override { m_context->forceLostContext(WebGLRenderingContext::RealLostContext); }
+ virtual ~WebGLRenderingContextLostCallback() {}
+private:
+ WebGLRenderingContextBase* m_context;
+};
+
+class WebGLRenderingContextErrorMessageCallback : public GraphicsContext3D::ErrorMessageCallback {
+ WTF_MAKE_FAST_ALLOCATED;
+public:
+ explicit WebGLRenderingContextErrorMessageCallback(WebGLRenderingContextBase* cb) : m_context(cb) { }
+ virtual void onErrorMessage(const String& message, GC3Dint) override
+ {
+ if (m_context->m_synthesizedErrorsToConsole)
+ m_context->printGLErrorToConsole(message);
+ }
+ virtual ~WebGLRenderingContextErrorMessageCallback() { }
+private:
+ WebGLRenderingContextBase* m_context;
+};
+
+std::unique_ptr<WebGLRenderingContextBase> WebGLRenderingContextBase::create(HTMLCanvasElement* canvas, WebGLContextAttributes* attrs, const String& type)
+{
+#if !ENABLE(WEBGL2)
+ UNUSED_PARAM(type);
+#endif
+
+ Document& document = canvas->document();
+ Frame* frame = document.frame();
+ if (!frame)
+ return nullptr;
+
+ // The FrameLoaderClient might block creation of a new WebGL context despite the page settings; in
+ // particular, if WebGL contexts were lost one or more times via the GL_ARB_robustness extension.
+ if (!frame->loader().client().allowWebGL(frame->settings().webGLEnabled())) {
+ canvas->dispatchEvent(WebGLContextEvent::create(eventNames().webglcontextcreationerrorEvent, false, true, "Web page was not allowed to create a WebGL context."));
+ return nullptr;
+ }
+
+ bool isPendingPolicyResolution = false;
+ Document& topDocument = document.topDocument();
+ Page* page = topDocument.page();
+ bool forcingPendingPolicy = frame->settings().isForcePendingWebGLPolicy();
+
+ if (forcingPendingPolicy || (page && !topDocument.url().isLocalFile())) {
+ WebGLLoadPolicy policy = forcingPendingPolicy ? WebGLPendingCreation : page->mainFrame().loader().client().webGLPolicyForURL(topDocument.url());
+
+ if (policy == WebGLBlockCreation) {
+ LOG(WebGL, "The policy for this URL (%s) is to block WebGL.", topDocument.url().host().utf8().data());
+ return nullptr;
+ }
+
+ if (policy == WebGLPendingCreation) {
+ LOG(WebGL, "WebGL policy is pending. May need to be resolved later.");
+ isPendingPolicyResolution = true;
+ }
+ }
+
+ GraphicsContext3D::Attributes attributes = attrs ? attrs->attributes() : GraphicsContext3D::Attributes();
+
+ if (attributes.antialias) {
+ if (!frame->settings().openGLMultisamplingEnabled())
+ attributes.antialias = false;
+ }
+
+ attributes.noExtensions = true;
+ attributes.shareResources = false;
+ attributes.preferDiscreteGPU = true;
+
+ if (frame->settings().forceSoftwareWebGLRendering())
+ attributes.forceSoftwareRenderer = true;
+
+ if (page)
+ attributes.devicePixelRatio = page->deviceScaleFactor();
+
+ if (isPendingPolicyResolution) {
+ LOG(WebGL, "Create a WebGL context that looks real, but will require a policy resolution if used.");
+ std::unique_ptr<WebGLRenderingContextBase> renderingContext = nullptr;
+#if ENABLE(WEBGL2)
+ if (type == "experimental-webgl2")
+ renderingContext = std::unique_ptr<WebGL2RenderingContext>(new WebGL2RenderingContext(canvas, attributes));
+ else
+#endif
+ renderingContext = std::unique_ptr<WebGLRenderingContext>(new WebGLRenderingContext(canvas, attributes));
+ renderingContext->suspendIfNeeded();
+ return renderingContext;
+ }
+
+ HostWindow* hostWindow = document.view()->root()->hostWindow();
+ RefPtr<GraphicsContext3D> context(GraphicsContext3D::create(attributes, hostWindow));
+
+ if (!context || !context->makeContextCurrent()) {
+ canvas->dispatchEvent(WebGLContextEvent::create(eventNames().webglcontextcreationerrorEvent, false, true, "Could not create a WebGL context."));
+ return nullptr;
+ }
+
+ Extensions3D* extensions = context->getExtensions();
+ if (extensions->supports("GL_EXT_debug_marker"))
+ extensions->pushGroupMarkerEXT("WebGLRenderingContext");
+
+ std::unique_ptr<WebGLRenderingContextBase> renderingContext = nullptr;
+#if ENABLE(WEBGL2)
+ if (type == "experimental-webgl2")
+ renderingContext = std::unique_ptr<WebGL2RenderingContext>(new WebGL2RenderingContext(canvas, context, attributes));
+ else
+#endif
+ renderingContext = std::unique_ptr<WebGLRenderingContext>(new WebGLRenderingContext(canvas, context, attributes));
+ renderingContext->suspendIfNeeded();
+
+ return renderingContext;
+}
+
+WebGLRenderingContextBase::WebGLRenderingContextBase(HTMLCanvasElement* passedCanvas, GraphicsContext3D::Attributes attributes)
+ : CanvasRenderingContext(passedCanvas)
+ , ActiveDOMObject(&passedCanvas->document())
+ , m_context(0)
+ , m_dispatchContextLostEventTimer(*this, &WebGLRenderingContextBase::dispatchContextLostEvent)
+ , m_restoreAllowed(false)
+ , m_restoreTimer(*this, &WebGLRenderingContextBase::maybeRestoreContext)
+ , m_generatedImageCache(0)
+ , m_contextLost(false)
+ , m_contextLostMode(SyntheticLostContext)
+ , m_attributes(attributes)
+ , m_synthesizedErrorsToConsole(true)
+ , m_numGLErrorsToConsoleAllowed(maxGLErrorsAllowedToConsole)
+ , m_isPendingPolicyResolution(true)
+ , m_hasRequestedPolicyResolution(false)
+{
+}
+
+WebGLRenderingContextBase::WebGLRenderingContextBase(HTMLCanvasElement* passedCanvas, PassRefPtr<GraphicsContext3D> context, GraphicsContext3D::Attributes attributes)
+ : CanvasRenderingContext(passedCanvas)
+ , ActiveDOMObject(&passedCanvas->document())
+ , m_context(context)
+ , m_dispatchContextLostEventTimer(*this, &WebGLRenderingContextBase::dispatchContextLostEvent)
+ , m_restoreAllowed(false)
+ , m_restoreTimer(*this, &WebGLRenderingContextBase::maybeRestoreContext)
+ , m_generatedImageCache(4)
+ , m_contextLost(false)
+ , m_contextLostMode(SyntheticLostContext)
+ , m_attributes(attributes)
+ , m_synthesizedErrorsToConsole(true)
+ , m_numGLErrorsToConsoleAllowed(maxGLErrorsAllowedToConsole)
+ , m_isPendingPolicyResolution(false)
+ , m_hasRequestedPolicyResolution(false)
+{
+ ASSERT(m_context);
+ m_contextGroup = WebGLContextGroup::create();
+ m_contextGroup->addContext(this);
+
+ m_context->setWebGLContext(this);
+
+ m_maxViewportDims[0] = m_maxViewportDims[1] = 0;
+ m_context->getIntegerv(GraphicsContext3D::MAX_VIEWPORT_DIMS, m_maxViewportDims);
+
+ setupFlags();
+ initializeNewContext();
+}
+
+void WebGLRenderingContextBase::initializeNewContext()
+{
+ ASSERT(!m_contextLost);
+ m_needsUpdate = true;
+ m_markedCanvasDirty = false;
+ m_activeTextureUnit = 0;
+ m_packAlignment = 4;
+ m_unpackAlignment = 4;
+ m_unpackFlipY = false;
+ m_unpackPremultiplyAlpha = false;
+ m_unpackColorspaceConversion = GraphicsContext3D::BROWSER_DEFAULT_WEBGL;
+ m_boundArrayBuffer = nullptr;
+ m_currentProgram = nullptr;
+ m_framebufferBinding = nullptr;
+ m_renderbufferBinding = nullptr;
+ m_depthMask = true;
+ m_stencilEnabled = false;
+ m_stencilMask = 0xFFFFFFFF;
+ m_stencilMaskBack = 0xFFFFFFFF;
+ m_stencilFuncRef = 0;
+ m_stencilFuncRefBack = 0;
+ m_stencilFuncMask = 0xFFFFFFFF;
+ m_stencilFuncMaskBack = 0xFFFFFFFF;
+ m_layerCleared = false;
+ m_numGLErrorsToConsoleAllowed = maxGLErrorsAllowedToConsole;
+
+ m_clearColor[0] = m_clearColor[1] = m_clearColor[2] = m_clearColor[3] = 0;
+ m_scissorEnabled = false;
+ m_clearDepth = 1;
+ m_clearStencil = 0;
+ m_colorMask[0] = m_colorMask[1] = m_colorMask[2] = m_colorMask[3] = true;
+
+ GC3Dint numCombinedTextureImageUnits = 0;
+ m_context->getIntegerv(GraphicsContext3D::MAX_COMBINED_TEXTURE_IMAGE_UNITS, &numCombinedTextureImageUnits);
+ m_textureUnits.clear();
+ m_textureUnits.resize(numCombinedTextureImageUnits);
+
+ GC3Dint numVertexAttribs = 0;
+ m_context->getIntegerv(GraphicsContext3D::MAX_VERTEX_ATTRIBS, &numVertexAttribs);
+ m_maxVertexAttribs = numVertexAttribs;
+
+ m_maxTextureSize = 0;
+ m_context->getIntegerv(GraphicsContext3D::MAX_TEXTURE_SIZE, &m_maxTextureSize);
+ m_maxTextureLevel = WebGLTexture::computeLevelCount(m_maxTextureSize, m_maxTextureSize);
+ m_maxCubeMapTextureSize = 0;
+ m_context->getIntegerv(GraphicsContext3D::MAX_CUBE_MAP_TEXTURE_SIZE, &m_maxCubeMapTextureSize);
+ m_maxCubeMapTextureLevel = WebGLTexture::computeLevelCount(m_maxCubeMapTextureSize, m_maxCubeMapTextureSize);
+ m_maxRenderbufferSize = 0;
+ m_context->getIntegerv(GraphicsContext3D::MAX_RENDERBUFFER_SIZE, &m_maxRenderbufferSize);
+
+ // These two values from EXT_draw_buffers are lazily queried.
+ m_maxDrawBuffers = 0;
+ m_maxColorAttachments = 0;
+
+ m_backDrawBuffer = GraphicsContext3D::BACK;
+ m_drawBuffersWebGLRequirementsChecked = false;
+ m_drawBuffersSupported = false;
+
+ m_vertexAttribValue.resize(m_maxVertexAttribs);
+
+ if (!isGLES2NPOTStrict())
+ createFallbackBlackTextures1x1();
+
+ IntSize canvasSize = clampedCanvasSize();
+ m_context->reshape(canvasSize.width(), canvasSize.height());
+ m_context->viewport(0, 0, canvasSize.width(), canvasSize.height());
+ m_context->scissor(0, 0, canvasSize.width(), canvasSize.height());
+
+ m_context->setContextLostCallback(std::make_unique<WebGLRenderingContextLostCallback>(this));
+ m_context->setErrorMessageCallback(std::make_unique<WebGLRenderingContextErrorMessageCallback>(this));
+}
+
+void WebGLRenderingContextBase::setupFlags()
+{
+ ASSERT(m_context);
+
+ if (Page* page = canvas()->document().page())
+ m_synthesizedErrorsToConsole = page->settings().webGLErrorsToConsoleEnabled();
+
+ m_isGLES2Compliant = m_context->isGLES2Compliant();
+ m_isErrorGeneratedOnOutOfBoundsAccesses = m_context->getExtensions()->isEnabled("GL_CHROMIUM_strict_attribs");
+ m_isResourceSafe = m_context->getExtensions()->isEnabled("GL_CHROMIUM_resource_safe");
+ if (m_isGLES2Compliant) {
+ m_isGLES2NPOTStrict = !m_context->getExtensions()->isEnabled("GL_OES_texture_npot");
+ m_isDepthStencilSupported = m_context->getExtensions()->isEnabled("GL_OES_packed_depth_stencil");
+ } else {
+ m_isGLES2NPOTStrict = !m_context->getExtensions()->isEnabled("GL_ARB_texture_non_power_of_two");
+ m_isDepthStencilSupported = m_context->getExtensions()->isEnabled("GL_EXT_packed_depth_stencil");
+ }
+ m_isRobustnessEXTSupported = m_context->getExtensions()->isEnabled("GL_EXT_robustness");
+}
+
+bool WebGLRenderingContextBase::allowPrivilegedExtensions() const
+{
+ if (Page* page = canvas()->document().page())
+ return page->settings().privilegedWebGLExtensionsEnabled();
+ return false;
+}
+
+void WebGLRenderingContextBase::addCompressedTextureFormat(GC3Denum format)
+{
+ if (!m_compressedTextureFormats.contains(format))
+ m_compressedTextureFormats.append(format);
+}
+
+WebGLRenderingContextBase::~WebGLRenderingContextBase()
+{
+ // Remove all references to WebGLObjects so if they are the last reference
+ // they will be freed before the last context is removed from the context group.
+ m_boundArrayBuffer = nullptr;
+ m_defaultVertexArrayObject = nullptr;
+ m_boundVertexArrayObject = nullptr;
+ m_vertexAttrib0Buffer = nullptr;
+ m_currentProgram = nullptr;
+ m_framebufferBinding = nullptr;
+ m_renderbufferBinding = nullptr;
+
+ for (size_t i = 0; i < m_textureUnits.size(); ++i) {
+ m_textureUnits[i].texture2DBinding = nullptr;
+ m_textureUnits[i].textureCubeMapBinding = nullptr;
+ }
+
+ m_blackTexture2D = nullptr;
+ m_blackTextureCubeMap = nullptr;
+
+ if (!m_isPendingPolicyResolution) {
+ detachAndRemoveAllObjects();
+ destroyGraphicsContext3D();
+ m_contextGroup->removeContext(this);
+ }
+}
+
+void WebGLRenderingContextBase::destroyGraphicsContext3D()
+{
+ if (m_isPendingPolicyResolution)
+ return;
+
+ if (m_context) {
+ m_context->setContextLostCallback(nullptr);
+ m_context->setErrorMessageCallback(nullptr);
+ m_context = nullptr;
+ }
+}
+
+void WebGLRenderingContextBase::markContextChanged()
+{
+ if (m_framebufferBinding)
+ return;
+
+ m_context->markContextChanged();
+
+ m_layerCleared = false;
+ RenderBox* renderBox = canvas()->renderBox();
+ if (isAccelerated() && renderBox && renderBox->hasAcceleratedCompositing()) {
+ m_markedCanvasDirty = true;
+ canvas()->clearCopiedImage();
+ renderBox->contentChanged(CanvasChanged);
+ } else {
+ if (!m_markedCanvasDirty) {
+ m_markedCanvasDirty = true;
+ canvas()->didDraw(FloatRect(FloatPoint(0, 0), clampedCanvasSize()));
+ }
+ }
+}
+
+bool WebGLRenderingContextBase::clearIfComposited(GC3Dbitfield mask)
+{
+ if (isContextLostOrPending())
+ return false;
+
+ if (!m_context->layerComposited() || m_layerCleared
+ || m_attributes.preserveDrawingBuffer || (mask && m_framebufferBinding))
+ return false;
+
+ RefPtr<WebGLContextAttributes> contextAttributes = getContextAttributes();
+
+ // Determine if it's possible to combine the clear the user asked for and this clear.
+ bool combinedClear = mask && !m_scissorEnabled;
+
+ m_context->disable(GraphicsContext3D::SCISSOR_TEST);
+ if (combinedClear && (mask & GraphicsContext3D::COLOR_BUFFER_BIT))
+ m_context->clearColor(m_colorMask[0] ? m_clearColor[0] : 0,
+ m_colorMask[1] ? m_clearColor[1] : 0,
+ m_colorMask[2] ? m_clearColor[2] : 0,
+ m_colorMask[3] ? m_clearColor[3] : 0);
+ else
+ m_context->clearColor(0, 0, 0, 0);
+ m_context->colorMask(true, true, true, true);
+ GC3Dbitfield clearMask = GraphicsContext3D::COLOR_BUFFER_BIT;
+ if (contextAttributes->depth()) {
+ if (!combinedClear || !m_depthMask || !(mask & GraphicsContext3D::DEPTH_BUFFER_BIT))
+ m_context->clearDepth(1.0f);
+ clearMask |= GraphicsContext3D::DEPTH_BUFFER_BIT;
+ m_context->depthMask(true);
+ }
+ if (contextAttributes->stencil()) {
+ if (combinedClear && (mask & GraphicsContext3D::STENCIL_BUFFER_BIT))
+ m_context->clearStencil(m_clearStencil & m_stencilMask);
+ else
+ m_context->clearStencil(0);
+ clearMask |= GraphicsContext3D::STENCIL_BUFFER_BIT;
+ m_context->stencilMaskSeparate(GraphicsContext3D::FRONT, 0xFFFFFFFF);
+ }
+ if (m_framebufferBinding)
+ m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, 0);
+ m_context->clear(clearMask);
+
+ restoreStateAfterClear();
+ if (m_framebufferBinding)
+ m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, objectOrZero(m_framebufferBinding.get()));
+ m_layerCleared = true;
+
+ return combinedClear;
+}
+
+void WebGLRenderingContextBase::restoreStateAfterClear()
+{
+ // Restore the state that the context set.
+ if (m_scissorEnabled)
+ m_context->enable(GraphicsContext3D::SCISSOR_TEST);
+ m_context->clearColor(m_clearColor[0], m_clearColor[1],
+ m_clearColor[2], m_clearColor[3]);
+ m_context->colorMask(m_colorMask[0], m_colorMask[1],
+ m_colorMask[2], m_colorMask[3]);
+ m_context->clearDepth(m_clearDepth);
+ m_context->clearStencil(m_clearStencil);
+ m_context->stencilMaskSeparate(GraphicsContext3D::FRONT, m_stencilMask);
+ m_context->depthMask(m_depthMask);
+}
+
+void WebGLRenderingContextBase::markLayerComposited()
+{
+ if (isContextLostOrPending())
+ return;
+ m_context->markLayerComposited();
+}
+
+void WebGLRenderingContextBase::paintRenderingResultsToCanvas()
+{
+ if (isContextLostOrPending())
+ return;
+
+ if (canvas()->document().printing())
+ canvas()->clearPresentationCopy();
+
+ // Until the canvas is written to by the application, the clear that
+ // happened after it was composited should be ignored by the compositor.
+ if (m_context->layerComposited() && !m_attributes.preserveDrawingBuffer) {
+ m_context->paintCompositedResultsToCanvas(canvas()->buffer());
+
+ canvas()->makePresentationCopy();
+ } else
+ canvas()->clearPresentationCopy();
+ clearIfComposited();
+
+ if (!m_markedCanvasDirty && !m_layerCleared)
+ return;
+
+ canvas()->clearCopiedImage();
+ m_markedCanvasDirty = false;
+
+ m_context->paintRenderingResultsToCanvas(canvas()->buffer());
+}
+
+PassRefPtr<ImageData> WebGLRenderingContextBase::paintRenderingResultsToImageData()
+{
+ if (isContextLostOrPending())
+ return nullptr;
+ clearIfComposited();
+ return m_context->paintRenderingResultsToImageData();
+}
+
+void WebGLRenderingContextBase::reshape(int width, int height)
+{
+ if (isContextLostOrPending())
+ return;
+
+ // This is an approximation because at WebGLRenderingContext level we don't
+ // know if the underlying FBO uses textures or renderbuffers.
+ GC3Dint maxSize = std::min(m_maxTextureSize, m_maxRenderbufferSize);
+ // Limit drawing buffer size to 4k to avoid memory exhaustion.
+ const int sizeUpperLimit = 4096;
+ maxSize = std::min(maxSize, sizeUpperLimit);
+ GC3Dint maxWidth = std::min(maxSize, m_maxViewportDims[0]);
+ GC3Dint maxHeight = std::min(maxSize, m_maxViewportDims[1]);
+ width = clamp(width, 1, maxWidth);
+ height = clamp(height, 1, maxHeight);
+
+ if (m_needsUpdate) {
+ RenderBox* renderBox = canvas()->renderBox();
+ if (renderBox && renderBox->hasAcceleratedCompositing())
+ renderBox->contentChanged(CanvasChanged);
+ m_needsUpdate = false;
+ }
+
+ // We don't have to mark the canvas as dirty, since the newly created image buffer will also start off
+ // clear (and this matches what reshape will do).
+ m_context->reshape(width, height);
+
+ m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, objectOrZero(m_textureUnits[m_activeTextureUnit].texture2DBinding.get()));
+ m_context->bindRenderbuffer(GraphicsContext3D::RENDERBUFFER, objectOrZero(m_renderbufferBinding.get()));
+ if (m_framebufferBinding)
+ m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, objectOrZero(m_framebufferBinding.get()));
+}
+
+int WebGLRenderingContextBase::drawingBufferWidth() const
+{
+ if (m_isPendingPolicyResolution && !m_hasRequestedPolicyResolution)
+ return 0;
+
+ return m_context->getInternalFramebufferSize().width();
+}
+
+int WebGLRenderingContextBase::drawingBufferHeight() const
+{
+ if (m_isPendingPolicyResolution && !m_hasRequestedPolicyResolution)
+ return 0;
+
+ return m_context->getInternalFramebufferSize().height();
+}
+
+unsigned WebGLRenderingContextBase::sizeInBytes(GC3Denum type)
+{
+ switch (type) {
+ case GraphicsContext3D::BYTE:
+ return sizeof(GC3Dbyte);
+ case GraphicsContext3D::UNSIGNED_BYTE:
+ return sizeof(GC3Dubyte);
+ case GraphicsContext3D::SHORT:
+ return sizeof(GC3Dshort);
+ case GraphicsContext3D::UNSIGNED_SHORT:
+ return sizeof(GC3Dushort);
+ case GraphicsContext3D::INT:
+ return sizeof(GC3Dint);
+ case GraphicsContext3D::UNSIGNED_INT:
+ return sizeof(GC3Duint);
+ case GraphicsContext3D::FLOAT:
+ return sizeof(GC3Dfloat);
+ }
+ ASSERT_NOT_REACHED();
+ return 0;
+}
+
+void WebGLRenderingContextBase::activeTexture(GC3Denum texture, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return;
+ if (texture - GraphicsContext3D::TEXTURE0 >= m_textureUnits.size()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "activeTexture", "texture unit out of range");
+ return;
+ }
+ m_activeTextureUnit = texture - GraphicsContext3D::TEXTURE0;
+ m_context->activeTexture(texture);
+}
+
+void WebGLRenderingContextBase::attachShader(WebGLProgram* program, WebGLShader* shader, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("attachShader", program) || !validateWebGLObject("attachShader", shader))
+ return;
+ if (!program->attachShader(shader)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "attachShader", "shader attachment already has shader");
+ return;
+ }
+ m_context->attachShader(objectOrZero(program), objectOrZero(shader));
+ shader->onAttached();
+}
+
+void WebGLRenderingContextBase::bindAttribLocation(WebGLProgram* program, GC3Duint index, const String& name, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("bindAttribLocation", program))
+ return;
+ if (!validateLocationLength("bindAttribLocation", name))
+ return;
+ if (!validateString("bindAttribLocation", name))
+ return;
+ if (isPrefixReserved(name)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "bindAttribLocation", "reserved prefix");
+ return;
+ }
+ if (index >= m_maxVertexAttribs) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "bindAttribLocation", "index out of range");
+ return;
+ }
+ m_context->bindAttribLocation(objectOrZero(program), index, name);
+}
+
+bool WebGLRenderingContextBase::checkObjectToBeBound(const char* functionName, WebGLObject* object, bool& deleted)
+{
+ deleted = false;
+ if (isContextLostOrPending())
+ return false;
+ if (object) {
+ if (!object->validate(contextGroup(), this)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "object not from this context");
+ return false;
+ }
+ deleted = !object->object();
+ }
+ return true;
+}
+
+void WebGLRenderingContextBase::bindBuffer(GC3Denum target, WebGLBuffer* buffer, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ bool deleted;
+ if (!checkObjectToBeBound("bindBuffer", buffer, deleted))
+ return;
+ if (deleted)
+ buffer = 0;
+ if (buffer && buffer->getTarget() && buffer->getTarget() != target) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "bindBuffer", "buffers can not be used with multiple targets");
+ return;
+ }
+ if (target == GraphicsContext3D::ARRAY_BUFFER)
+ m_boundArrayBuffer = buffer;
+ else if (target == GraphicsContext3D::ELEMENT_ARRAY_BUFFER)
+ m_boundVertexArrayObject->setElementArrayBuffer(buffer);
+ else {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "bindBuffer", "invalid target");
+ return;
+ }
+
+ m_context->bindBuffer(target, objectOrZero(buffer));
+ if (buffer)
+ buffer->setTarget(target);
+}
+
+void WebGLRenderingContextBase::bindFramebuffer(GC3Denum target, WebGLFramebuffer* buffer, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ bool deleted;
+ if (!checkObjectToBeBound("bindFramebuffer", buffer, deleted))
+ return;
+ if (deleted)
+ buffer = 0;
+ if (target != GraphicsContext3D::FRAMEBUFFER) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "bindFramebuffer", "invalid target");
+ return;
+ }
+ m_framebufferBinding = buffer;
+ m_context->bindFramebuffer(target, objectOrZero(buffer));
+ if (buffer)
+ buffer->setHasEverBeenBound();
+ applyStencilTest();
+}
+
+void WebGLRenderingContextBase::bindRenderbuffer(GC3Denum target, WebGLRenderbuffer* renderBuffer, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ bool deleted;
+ if (!checkObjectToBeBound("bindRenderbuffer", renderBuffer, deleted))
+ return;
+ if (deleted)
+ renderBuffer = 0;
+ if (target != GraphicsContext3D::RENDERBUFFER) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "bindRenderbuffer", "invalid target");
+ return;
+ }
+ m_renderbufferBinding = renderBuffer;
+ m_context->bindRenderbuffer(target, objectOrZero(renderBuffer));
+ if (renderBuffer)
+ renderBuffer->setHasEverBeenBound();
+}
+
+void WebGLRenderingContextBase::bindTexture(GC3Denum target, WebGLTexture* texture, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ bool deleted;
+ if (!checkObjectToBeBound("bindTexture", texture, deleted))
+ return;
+ if (deleted)
+ texture = 0;
+ if (texture && texture->getTarget() && texture->getTarget() != target) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "bindTexture", "textures can not be used with multiple targets");
+ return;
+ }
+ GC3Dint maxLevel = 0;
+ if (target == GraphicsContext3D::TEXTURE_2D) {
+ m_textureUnits[m_activeTextureUnit].texture2DBinding = texture;
+ maxLevel = m_maxTextureLevel;
+ } else if (target == GraphicsContext3D::TEXTURE_CUBE_MAP) {
+ m_textureUnits[m_activeTextureUnit].textureCubeMapBinding = texture;
+ maxLevel = m_maxCubeMapTextureLevel;
+ } else {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "bindTexture", "invalid target");
+ return;
+ }
+ m_context->bindTexture(target, objectOrZero(texture));
+ if (texture)
+ texture->setTarget(target, maxLevel);
+
+ // Note: previously we used to automatically set the TEXTURE_WRAP_R
+ // repeat mode to CLAMP_TO_EDGE for cube map textures, because OpenGL
+ // ES 2.0 doesn't expose this flag (a bug in the specification) and
+ // otherwise the application has no control over the seams in this
+ // dimension. However, it appears that supporting this properly on all
+ // platforms is fairly involved (will require a HashMap from texture ID
+ // in all ports), and we have not had any complaints, so the logic has
+ // been removed.
+}
+
+void WebGLRenderingContextBase::blendColor(GC3Dfloat red, GC3Dfloat green, GC3Dfloat blue, GC3Dfloat alpha)
+{
+ if (isContextLostOrPending())
+ return;
+ m_context->blendColor(red, green, blue, alpha);
+}
+
+void WebGLRenderingContextBase::blendEquation(GC3Denum mode)
+{
+ if (isContextLostOrPending() || !validateBlendEquation("blendEquation", mode))
+ return;
+ m_context->blendEquation(mode);
+}
+
+void WebGLRenderingContextBase::blendEquationSeparate(GC3Denum modeRGB, GC3Denum modeAlpha)
+{
+ if (isContextLostOrPending() || !validateBlendEquation("blendEquation", modeRGB) || !validateBlendEquation("blendEquation", modeAlpha))
+ return;
+ m_context->blendEquationSeparate(modeRGB, modeAlpha);
+}
+
+
+void WebGLRenderingContextBase::blendFunc(GC3Denum sfactor, GC3Denum dfactor)
+{
+ if (isContextLostOrPending() || !validateBlendFuncFactors("blendFunc", sfactor, dfactor))
+ return;
+ m_context->blendFunc(sfactor, dfactor);
+}
+
+void WebGLRenderingContextBase::blendFuncSeparate(GC3Denum srcRGB, GC3Denum dstRGB, GC3Denum srcAlpha, GC3Denum dstAlpha)
+{
+ // Note: Alpha does not have the same restrictions as RGB.
+ if (isContextLostOrPending() || !validateBlendFuncFactors("blendFunc", srcRGB, dstRGB))
+ return;
+ m_context->blendFuncSeparate(srcRGB, dstRGB, srcAlpha, dstAlpha);
+}
+
+void WebGLRenderingContextBase::bufferData(GC3Denum target, long long size, GC3Denum usage, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return;
+ WebGLBuffer* buffer = validateBufferDataParameters("bufferData", target, usage);
+ if (!buffer)
+ return;
+ if (size < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "bufferData", "size < 0");
+ return;
+ }
+ if (!size) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "bufferData", "size == 0");
+ return;
+ }
+ if (!isErrorGeneratedOnOutOfBoundsAccesses()) {
+ if (!buffer->associateBufferData(static_cast<GC3Dsizeiptr>(size))) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "bufferData", "invalid buffer");
+ return;
+ }
+ }
+
+ m_context->moveErrorsToSyntheticErrorList();
+ m_context->bufferData(target, static_cast<GC3Dsizeiptr>(size), usage);
+ if (m_context->moveErrorsToSyntheticErrorList()) {
+ // The bufferData function failed. Tell the buffer it doesn't have the data it thinks it does.
+ buffer->disassociateBufferData();
+ }
+}
+
+void WebGLRenderingContextBase::bufferData(GC3Denum target, ArrayBuffer* data, GC3Denum usage, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return;
+ WebGLBuffer* buffer = validateBufferDataParameters("bufferData", target, usage);
+ if (!buffer)
+ return;
+ if (!data) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "bufferData", "no data");
+ return;
+ }
+ if (!isErrorGeneratedOnOutOfBoundsAccesses()) {
+ if (!buffer->associateBufferData(data)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "bufferData", "invalid buffer");
+ return;
+ }
+ }
+
+ m_context->moveErrorsToSyntheticErrorList();
+ m_context->bufferData(target, data->byteLength(), data->data(), usage);
+ if (m_context->moveErrorsToSyntheticErrorList()) {
+ // The bufferData function failed. Tell the buffer it doesn't have the data it thinks it does.
+ buffer->disassociateBufferData();
+ }
+}
+
+void WebGLRenderingContextBase::bufferData(GC3Denum target, ArrayBufferView* data, GC3Denum usage, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return;
+ WebGLBuffer* buffer = validateBufferDataParameters("bufferData", target, usage);
+ if (!buffer)
+ return;
+ if (!data) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "bufferData", "no data");
+ return;
+ }
+ if (!isErrorGeneratedOnOutOfBoundsAccesses()) {
+ if (!buffer->associateBufferData(data)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "bufferData", "invalid buffer");
+ return;
+ }
+ }
+
+ m_context->moveErrorsToSyntheticErrorList();
+ m_context->bufferData(target, data->byteLength(), data->baseAddress(), usage);
+ if (m_context->moveErrorsToSyntheticErrorList()) {
+ // The bufferData function failed. Tell the buffer it doesn't have the data it thinks it does.
+ buffer->disassociateBufferData();
+ }
+}
+
+void WebGLRenderingContextBase::bufferSubData(GC3Denum target, long long offset, ArrayBuffer* data, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return;
+ WebGLBuffer* buffer = validateBufferDataParameters("bufferSubData", target, GraphicsContext3D::STATIC_DRAW);
+ if (!buffer)
+ return;
+ if (offset < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "bufferSubData", "offset < 0");
+ return;
+ }
+ if (!data)
+ return;
+ if (!isErrorGeneratedOnOutOfBoundsAccesses()) {
+ if (!buffer->associateBufferSubData(static_cast<GC3Dintptr>(offset), data)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "bufferSubData", "offset out of range");
+ return;
+ }
+ }
+
+ m_context->moveErrorsToSyntheticErrorList();
+ m_context->bufferSubData(target, static_cast<GC3Dintptr>(offset), data->byteLength(), data->data());
+ if (m_context->moveErrorsToSyntheticErrorList()) {
+ // The bufferSubData function failed. Tell the buffer it doesn't have the data it thinks it does.
+ buffer->disassociateBufferData();
+ }
+}
+
+void WebGLRenderingContextBase::bufferSubData(GC3Denum target, long long offset, ArrayBufferView* data, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return;
+ WebGLBuffer* buffer = validateBufferDataParameters("bufferSubData", target, GraphicsContext3D::STATIC_DRAW);
+ if (!buffer)
+ return;
+ if (offset < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "bufferSubData", "offset < 0");
+ return;
+ }
+ if (!data)
+ return;
+ if (!isErrorGeneratedOnOutOfBoundsAccesses()) {
+ if (!buffer->associateBufferSubData(static_cast<GC3Dintptr>(offset), data)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "bufferSubData", "offset out of range");
+ return;
+ }
+ }
+
+ m_context->moveErrorsToSyntheticErrorList();
+ m_context->bufferSubData(target, static_cast<GC3Dintptr>(offset), data->byteLength(), data->baseAddress());
+ if (m_context->moveErrorsToSyntheticErrorList()) {
+ // The bufferSubData function failed. Tell the buffer it doesn't have the data it thinks it does.
+ buffer->disassociateBufferData();
+ }
+}
+
+GC3Denum WebGLRenderingContextBase::checkFramebufferStatus(GC3Denum target)
+{
+ if (isContextLostOrPending())
+ return GraphicsContext3D::FRAMEBUFFER_UNSUPPORTED;
+ if (target != GraphicsContext3D::FRAMEBUFFER) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "checkFramebufferStatus", "invalid target");
+ return 0;
+ }
+ if (!m_framebufferBinding || !m_framebufferBinding->object())
+ return GraphicsContext3D::FRAMEBUFFER_COMPLETE;
+ const char* reason = "framebuffer incomplete";
+ GC3Denum result = m_framebufferBinding->checkStatus(&reason);
+ if (result != GraphicsContext3D::FRAMEBUFFER_COMPLETE) {
+ printGLWarningToConsole("checkFramebufferStatus", reason);
+ return result;
+ }
+ result = m_context->checkFramebufferStatus(target);
+ return result;
+}
+
+void WebGLRenderingContextBase::clearColor(GC3Dfloat r, GC3Dfloat g, GC3Dfloat b, GC3Dfloat a)
+{
+ if (isContextLostOrPending())
+ return;
+ if (std::isnan(r))
+ r = 0;
+ if (std::isnan(g))
+ g = 0;
+ if (std::isnan(b))
+ b = 0;
+ if (std::isnan(a))
+ a = 1;
+ m_clearColor[0] = r;
+ m_clearColor[1] = g;
+ m_clearColor[2] = b;
+ m_clearColor[3] = a;
+ m_context->clearColor(r, g, b, a);
+}
+
+void WebGLRenderingContextBase::clearDepth(GC3Dfloat depth)
+{
+ if (isContextLostOrPending())
+ return;
+ m_clearDepth = depth;
+ m_context->clearDepth(depth);
+}
+
+void WebGLRenderingContextBase::clearStencil(GC3Dint s)
+{
+ if (isContextLostOrPending())
+ return;
+ m_clearStencil = s;
+ m_context->clearStencil(s);
+}
+
+void WebGLRenderingContextBase::colorMask(GC3Dboolean red, GC3Dboolean green, GC3Dboolean blue, GC3Dboolean alpha)
+{
+ if (isContextLostOrPending())
+ return;
+ m_colorMask[0] = red;
+ m_colorMask[1] = green;
+ m_colorMask[2] = blue;
+ m_colorMask[3] = alpha;
+ m_context->colorMask(red, green, blue, alpha);
+}
+
+void WebGLRenderingContextBase::compileShader(WebGLShader* shader, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("compileShader", shader))
+ return;
+ m_context->compileShader(objectOrZero(shader));
+ GC3Dint value;
+ m_context->getShaderiv(objectOrZero(shader), GraphicsContext3D::COMPILE_STATUS, &value);
+ shader->setValid(value);
+}
+
+void WebGLRenderingContextBase::compressedTexImage2D(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dsizei width,
+ GC3Dsizei height, GC3Dint border, ArrayBufferView* data)
+{
+ if (isContextLostOrPending())
+ return;
+ if (!validateTexFuncLevel("compressedTexImage2D", target, level))
+ return;
+
+ if (!validateCompressedTexFormat(internalformat)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "compressedTexImage2D", "invalid internalformat");
+ return;
+ }
+ if (border) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "compressedTexImage2D", "border not 0");
+ return;
+ }
+ if (!validateCompressedTexDimensions("compressedTexImage2D", target, level, width, height, internalformat))
+ return;
+ if (!validateCompressedTexFuncData("compressedTexImage2D", width, height, internalformat, data))
+ return;
+
+ WebGLTexture* tex = validateTextureBinding("compressedTexImage2D", target, true);
+ if (!tex)
+ return;
+ if (!isGLES2NPOTStrict()) {
+ if (level && WebGLTexture::isNPOT(width, height)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "compressedTexImage2D", "level > 0 not power of 2");
+ return;
+ }
+ }
+ m_context->moveErrorsToSyntheticErrorList();
+ m_context->compressedTexImage2D(target, level, internalformat, width, height,
+ border, data->byteLength(), data->baseAddress());
+ if (m_context->moveErrorsToSyntheticErrorList()) {
+ // The compressedTexImage2D function failed. Tell the WebGLTexture it doesn't have the data for this level.
+ tex->markInvalid(target, level);
+ return;
+ }
+
+ tex->setLevelInfo(target, level, internalformat, width, height, GraphicsContext3D::UNSIGNED_BYTE);
+ tex->setCompressed();
+}
+
+void WebGLRenderingContextBase::compressedTexSubImage2D(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset,
+ GC3Dsizei width, GC3Dsizei height, GC3Denum format, ArrayBufferView* data)
+{
+ if (isContextLostOrPending())
+ return;
+ if (!validateTexFuncLevel("compressedTexSubImage2D", target, level))
+ return;
+ if (!validateCompressedTexFormat(format)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "compressedTexSubImage2D", "invalid format");
+ return;
+ }
+ if (!validateCompressedTexFuncData("compressedTexSubImage2D", width, height, format, data))
+ return;
+
+ WebGLTexture* tex = validateTextureBinding("compressedTexSubImage2D", target, true);
+ if (!tex)
+ return;
+
+ if (format != tex->getInternalFormat(target, level)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "compressedTexSubImage2D", "format does not match texture format");
+ return;
+ }
+
+ if (!validateCompressedTexSubDimensions("compressedTexSubImage2D", target, level, xoffset, yoffset, width, height, format, tex))
+ return;
+
+ graphicsContext3D()->compressedTexSubImage2D(target, level, xoffset, yoffset,
+ width, height, format, data->byteLength(), data->baseAddress());
+ tex->setCompressed();
+}
+
+bool WebGLRenderingContextBase::validateSettableTexFormat(const char* functionName, GC3Denum format)
+{
+ if (GraphicsContext3D::getClearBitsByFormat(format) & (GraphicsContext3D::DEPTH_BUFFER_BIT | GraphicsContext3D::STENCIL_BUFFER_BIT)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "format can not be set, only rendered to");
+ return false;
+ }
+ return true;
+}
+
+void WebGLRenderingContextBase::copyTexSubImage2D(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height)
+{
+ if (isContextLostOrPending())
+ return;
+ if (!validateTexFuncLevel("copyTexSubImage2D", target, level))
+ return;
+ WebGLTexture* tex = validateTextureBinding("copyTexSubImage2D", target, true);
+ if (!tex)
+ return;
+ if (!validateSize("copyTexSubImage2D", xoffset, yoffset) || !validateSize("copyTexSubImage2D", width, height))
+ return;
+ // Before checking if it is in the range, check if overflow happens first.
+ if (xoffset + width < 0 || yoffset + height < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "copyTexSubImage2D", "bad dimensions");
+ return;
+ }
+ if (xoffset + width > tex->getWidth(target, level) || yoffset + height > tex->getHeight(target, level)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "copyTexSubImage2D", "rectangle out of range");
+ return;
+ }
+ GC3Denum internalformat = tex->getInternalFormat(target, level);
+ if (!validateSettableTexFormat("copyTexSubImage2D", internalformat))
+ return;
+ if (!isTexInternalFormatColorBufferCombinationValid(internalformat, getBoundFramebufferColorFormat())) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "copyTexSubImage2D", "framebuffer is incompatible format");
+ return;
+ }
+ const char* reason = "framebuffer incomplete";
+ if (m_framebufferBinding && !m_framebufferBinding->onAccess(graphicsContext3D(), !isResourceSafe(), &reason)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_FRAMEBUFFER_OPERATION, "copyTexSubImage2D", reason);
+ return;
+ }
+ clearIfComposited();
+ if (isResourceSafe())
+ m_context->copyTexSubImage2D(target, level, xoffset, yoffset, x, y, width, height);
+ else {
+ GC3Dint clippedX, clippedY;
+ GC3Dsizei clippedWidth, clippedHeight;
+ if (clip2D(x, y, width, height, getBoundFramebufferWidth(), getBoundFramebufferHeight(), &clippedX, &clippedY, &clippedWidth, &clippedHeight)) {
+ GC3Denum format = tex->getInternalFormat(target, level);
+ GC3Denum type = tex->getType(target, level);
+ std::unique_ptr<unsigned char[]> zero;
+ if (width && height) {
+ unsigned int size;
+ GC3Denum error = m_context->computeImageSizeInBytes(format, type, width, height, m_unpackAlignment, &size, 0);
+ if (error != GraphicsContext3D::NO_ERROR) {
+ synthesizeGLError(error, "copyTexSubImage2D", "bad dimensions");
+ return;
+ }
+ zero = std::make_unique<unsigned char[]>(size);
+ if (!zero) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "copyTexSubImage2D", "out of memory");
+ return;
+ }
+ memset(zero.get(), 0, size);
+ }
+ m_context->texSubImage2D(target, level, xoffset, yoffset, width, height, format, type, zero.get());
+ if (clippedWidth > 0 && clippedHeight > 0)
+ m_context->copyTexSubImage2D(target, level, xoffset + clippedX - x, yoffset + clippedY - y,
+ clippedX, clippedY, clippedWidth, clippedHeight);
+ } else
+ m_context->copyTexSubImage2D(target, level, xoffset, yoffset, x, y, width, height);
+ }
+}
+
+PassRefPtr<WebGLBuffer> WebGLRenderingContextBase::createBuffer()
+{
+ if (isContextLostOrPending())
+ return nullptr;
+ RefPtr<WebGLBuffer> o = WebGLBuffer::create(this);
+ addSharedObject(o.get());
+ return o;
+}
+
+PassRefPtr<WebGLFramebuffer> WebGLRenderingContextBase::createFramebuffer()
+{
+ if (isContextLostOrPending())
+ return nullptr;
+ RefPtr<WebGLFramebuffer> o = WebGLFramebuffer::create(this);
+ addContextObject(o.get());
+ return o;
+}
+
+PassRefPtr<WebGLTexture> WebGLRenderingContextBase::createTexture()
+{
+ if (isContextLostOrPending())
+ return nullptr;
+ RefPtr<WebGLTexture> o = WebGLTexture::create(this);
+ addSharedObject(o.get());
+ return o;
+}
+
+PassRefPtr<WebGLProgram> WebGLRenderingContextBase::createProgram()
+{
+ if (isContextLostOrPending())
+ return nullptr;
+ RefPtr<WebGLProgram> o = WebGLProgram::create(this);
+ addSharedObject(o.get());
+ return o;
+}
+
+PassRefPtr<WebGLRenderbuffer> WebGLRenderingContextBase::createRenderbuffer()
+{
+ if (isContextLostOrPending())
+ return nullptr;
+ RefPtr<WebGLRenderbuffer> o = WebGLRenderbuffer::create(this);
+ addSharedObject(o.get());
+ return o;
+}
+
+PassRefPtr<WebGLShader> WebGLRenderingContextBase::createShader(GC3Denum type, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return nullptr;
+ if (type != GraphicsContext3D::VERTEX_SHADER && type != GraphicsContext3D::FRAGMENT_SHADER) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "createShader", "invalid shader type");
+ return nullptr;
+ }
+
+ RefPtr<WebGLShader> o = WebGLShader::create(this, type);
+ addSharedObject(o.get());
+ return o;
+}
+
+void WebGLRenderingContextBase::cullFace(GC3Denum mode)
+{
+ if (isContextLostOrPending())
+ return;
+ m_context->cullFace(mode);
+}
+
+bool WebGLRenderingContextBase::deleteObject(WebGLObject* object)
+{
+ if (isContextLostOrPending() || !object)
+ return false;
+ if (!object->validate(contextGroup(), this)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "delete", "object does not belong to this context");
+ return false;
+ }
+ if (object->object())
+ // We need to pass in context here because we want
+ // things in this context unbound.
+ object->deleteObject(graphicsContext3D());
+ return true;
+}
+
+void WebGLRenderingContextBase::deleteBuffer(WebGLBuffer* buffer)
+{
+ if (!deleteObject(buffer))
+ return;
+ if (m_boundArrayBuffer == buffer)
+ m_boundArrayBuffer = nullptr;
+
+ m_boundVertexArrayObject->unbindBuffer(buffer);
+}
+
+void WebGLRenderingContextBase::deleteFramebuffer(WebGLFramebuffer* framebuffer)
+{
+ if (!deleteObject(framebuffer))
+ return;
+ if (framebuffer == m_framebufferBinding) {
+ m_framebufferBinding = nullptr;
+ m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, 0);
+ }
+}
+
+void WebGLRenderingContextBase::deleteProgram(WebGLProgram* program)
+{
+ deleteObject(program);
+ // We don't reset m_currentProgram to 0 here because the deletion of the
+ // current program is delayed.
+}
+
+void WebGLRenderingContextBase::deleteRenderbuffer(WebGLRenderbuffer* renderbuffer)
+{
+ if (!deleteObject(renderbuffer))
+ return;
+ if (renderbuffer == m_renderbufferBinding)
+ m_renderbufferBinding = nullptr;
+ if (m_framebufferBinding)
+ m_framebufferBinding->removeAttachmentFromBoundFramebuffer(renderbuffer);
+}
+
+void WebGLRenderingContextBase::deleteShader(WebGLShader* shader)
+{
+ deleteObject(shader);
+}
+
+void WebGLRenderingContextBase::deleteTexture(WebGLTexture* texture)
+{
+ if (!deleteObject(texture))
+ return;
+ for (size_t i = 0; i < m_textureUnits.size(); ++i) {
+ if (texture == m_textureUnits[i].texture2DBinding)
+ m_textureUnits[i].texture2DBinding = nullptr;
+ if (texture == m_textureUnits[i].textureCubeMapBinding)
+ m_textureUnits[i].textureCubeMapBinding = nullptr;
+ }
+ if (m_framebufferBinding)
+ m_framebufferBinding->removeAttachmentFromBoundFramebuffer(texture);
+}
+
+void WebGLRenderingContextBase::depthFunc(GC3Denum func)
+{
+ if (isContextLostOrPending())
+ return;
+ m_context->depthFunc(func);
+}
+
+void WebGLRenderingContextBase::depthMask(GC3Dboolean flag)
+{
+ if (isContextLostOrPending())
+ return;
+ m_depthMask = flag;
+ m_context->depthMask(flag);
+}
+
+void WebGLRenderingContextBase::depthRange(GC3Dfloat zNear, GC3Dfloat zFar)
+{
+ if (isContextLostOrPending())
+ return;
+ if (zNear > zFar) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "depthRange", "zNear > zFar");
+ return;
+ }
+ m_context->depthRange(zNear, zFar);
+}
+
+void WebGLRenderingContextBase::detachShader(WebGLProgram* program, WebGLShader* shader, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("detachShader", program) || !validateWebGLObject("detachShader", shader))
+ return;
+ if (!program->detachShader(shader)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "detachShader", "shader not attached");
+ return;
+ }
+ m_context->detachShader(objectOrZero(program), objectOrZero(shader));
+ shader->onDetached(graphicsContext3D());
+}
+
+void WebGLRenderingContextBase::disable(GC3Denum cap)
+{
+ if (isContextLostOrPending() || !validateCapability("disable", cap))
+ return;
+ if (cap == GraphicsContext3D::STENCIL_TEST) {
+ m_stencilEnabled = false;
+ applyStencilTest();
+ return;
+ }
+ if (cap == GraphicsContext3D::SCISSOR_TEST)
+ m_scissorEnabled = false;
+ m_context->disable(cap);
+}
+
+void WebGLRenderingContextBase::disableVertexAttribArray(GC3Duint index, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return;
+ if (index >= m_maxVertexAttribs) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "disableVertexAttribArray", "index out of range");
+ return;
+ }
+
+ WebGLVertexArrayObjectBase::VertexAttribState& state = m_boundVertexArrayObject->getVertexAttribState(index);
+ state.enabled = false;
+
+ if (index > 0 || isGLES2Compliant())
+ m_context->disableVertexAttribArray(index);
+}
+
+bool WebGLRenderingContextBase::validateElementArraySize(GC3Dsizei count, GC3Denum type, GC3Dintptr offset)
+{
+ RefPtr<WebGLBuffer> elementArrayBuffer = m_boundVertexArrayObject->getElementArrayBuffer();
+
+ if (!elementArrayBuffer)
+ return false;
+
+ if (offset < 0)
+ return false;
+
+ if (type == GraphicsContext3D::UNSIGNED_INT) {
+ // For an unsigned int array, offset must be divisible by 4 for alignment reasons.
+ if (offset % 4)
+ return false;
+
+ // Make uoffset an element offset.
+ offset /= 4;
+
+ GC3Dsizeiptr n = elementArrayBuffer->byteLength() / 4;
+ if (offset > n || count > n - offset)
+ return false;
+ } else if (type == GraphicsContext3D::UNSIGNED_SHORT) {
+ // For an unsigned short array, offset must be divisible by 2 for alignment reasons.
+ if (offset % 2)
+ return false;
+
+ // Make uoffset an element offset.
+ offset /= 2;
+
+ GC3Dsizeiptr n = elementArrayBuffer->byteLength() / 2;
+ if (offset > n || count > n - offset)
+ return false;
+ } else if (type == GraphicsContext3D::UNSIGNED_BYTE) {
+ GC3Dsizeiptr n = elementArrayBuffer->byteLength();
+ if (offset > n || count > n - offset)
+ return false;
+ }
+ return true;
+}
+
+bool WebGLRenderingContextBase::validateIndexArrayPrecise(GC3Dsizei count, GC3Denum type, GC3Dintptr offset, unsigned& numElementsRequired)
+{
+ ASSERT(count >= 0 && offset >= 0);
+ unsigned lastIndex = 0;
+
+ RefPtr<WebGLBuffer> elementArrayBuffer = m_boundVertexArrayObject->getElementArrayBuffer();
+
+ if (!elementArrayBuffer)
+ return false;
+
+ if (!count) {
+ numElementsRequired = 0;
+ return true;
+ }
+
+ if (!elementArrayBuffer->elementArrayBuffer())
+ return false;
+
+ unsigned long uoffset = offset;
+ unsigned long n = count;
+
+ if (type == GraphicsContext3D::UNSIGNED_INT) {
+ // Make uoffset an element offset.
+ uoffset /= sizeof(GC3Duint);
+ const GC3Duint* p = static_cast<const GC3Duint*>(elementArrayBuffer->elementArrayBuffer()->data()) + uoffset;
+ while (n-- > 0) {
+ if (*p > lastIndex)
+ lastIndex = *p;
+ ++p;
+ }
+ } else if (type == GraphicsContext3D::UNSIGNED_SHORT) {
+ // Make uoffset an element offset.
+ uoffset /= sizeof(GC3Dushort);
+ const GC3Dushort* p = static_cast<const GC3Dushort*>(elementArrayBuffer->elementArrayBuffer()->data()) + uoffset;
+ while (n-- > 0) {
+ if (*p > lastIndex)
+ lastIndex = *p;
+ ++p;
+ }
+ } else if (type == GraphicsContext3D::UNSIGNED_BYTE) {
+ const GC3Dubyte* p = static_cast<const GC3Dubyte*>(elementArrayBuffer->elementArrayBuffer()->data()) + uoffset;
+ while (n-- > 0) {
+ if (*p > lastIndex)
+ lastIndex = *p;
+ ++p;
+ }
+ }
+
+ // Then set the last index in the index array and make sure it is valid.
+ numElementsRequired = lastIndex + 1;
+ return numElementsRequired > 0;
+}
+
+bool WebGLRenderingContextBase::validateVertexAttributes(unsigned elementCount, unsigned primitiveCount)
+{
+ if (!m_currentProgram)
+ return false;
+
+ // Look in each enabled vertex attrib and check if they've been bound to a buffer.
+ for (unsigned i = 0; i < m_maxVertexAttribs; ++i) {
+ if (!m_boundVertexArrayObject->getVertexAttribState(i).validateBinding())
+ return false;
+ }
+
+ if (elementCount <= 0)
+ return true;
+
+
+ // Look in each consumed vertex attrib (by the current program).
+ bool sawNonInstancedAttrib = false;
+ bool sawEnabledAttrib = false;
+ int numActiveAttribLocations = m_currentProgram->numActiveAttribLocations();
+ for (int i = 0; i < numActiveAttribLocations; ++i) {
+ int loc = m_currentProgram->getActiveAttribLocation(i);
+ if (loc >= 0 && loc < static_cast<int>(m_maxVertexAttribs)) {
+ const WebGLVertexArrayObjectBase::VertexAttribState& state = m_boundVertexArrayObject->getVertexAttribState(loc);
+ if (state.enabled) {
+ sawEnabledAttrib = true;
+ // Avoid off-by-one errors in numElements computation.
+ // For the last element, we will only touch the data for the
+ // element and nothing beyond it.
+ int bytesRemaining = static_cast<int>(state.bufferBinding->byteLength() - state.offset);
+ unsigned numElements = 0;
+ ASSERT(state.stride > 0);
+ if (bytesRemaining >= state.bytesPerElement)
+ numElements = 1 + (bytesRemaining - state.bytesPerElement) / state.stride;
+ unsigned instancesRequired = 0;
+ if (state.divisor) {
+ instancesRequired = ceil(static_cast<float>(primitiveCount) / state.divisor);
+ if (instancesRequired > numElements)
+ return false;
+ } else {
+ sawNonInstancedAttrib = true;
+ if (elementCount > numElements)
+ return false;
+ }
+ }
+ }
+ }
+
+ if (!sawNonInstancedAttrib && sawEnabledAttrib)
+ return false;
+
+ return true;
+}
+
+bool WebGLRenderingContextBase::validateWebGLObject(const char* functionName, WebGLObject* object)
+{
+ if (!object || !object->object()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "no object or object deleted");
+ return false;
+ }
+ if (!object->validate(contextGroup(), this)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "object does not belong to this context");
+ return false;
+ }
+ return true;
+}
+
+bool WebGLRenderingContextBase::validateDrawArrays(const char* functionName, GC3Denum mode, GC3Dint first, GC3Dsizei count, GC3Dsizei primitiveCount)
+{
+ if (isContextLostOrPending() || !validateDrawMode(functionName, mode))
+ return false;
+
+ if (!validateStencilSettings(functionName))
+ return false;
+
+ if (first < 0 || count < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "first or count < 0");
+ return false;
+ }
+
+ if (!count) {
+ markContextChanged();
+ return false;
+ }
+
+ if (primitiveCount < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "primcount < 0");
+ return false;
+ }
+
+ if (!isErrorGeneratedOnOutOfBoundsAccesses()) {
+ // Ensure we have a valid rendering state
+ Checked<GC3Dint, RecordOverflow> checkedFirst(first);
+ Checked<GC3Dint, RecordOverflow> checkedCount(count);
+ Checked<GC3Dint, RecordOverflow> checkedSum = checkedFirst + checkedCount;
+ Checked<GC3Dint, RecordOverflow> checkedPrimitiveCount(primitiveCount);
+ if (checkedSum.hasOverflowed() || checkedPrimitiveCount.hasOverflowed() || !validateVertexAttributes(checkedSum.unsafeGet(), checkedPrimitiveCount.unsafeGet())) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "attempt to access out of bounds arrays");
+ return false;
+ }
+ } else {
+ if (!validateVertexAttributes(0)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "attribs not setup correctly");
+ return false;
+ }
+ }
+
+ const char* reason = "framebuffer incomplete";
+ if (m_framebufferBinding && !m_framebufferBinding->onAccess(graphicsContext3D(), !isResourceSafe(), &reason)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_FRAMEBUFFER_OPERATION, functionName, reason);
+ return false;
+ }
+
+ return true;
+}
+
+bool WebGLRenderingContextBase::validateDrawElements(const char* functionName, GC3Denum mode, GC3Dsizei count, GC3Denum type, long long offset, unsigned& numElements, GC3Dsizei primitiveCount)
+{
+ if (isContextLostOrPending() || !validateDrawMode(functionName, mode))
+ return false;
+
+ if (!validateStencilSettings(functionName))
+ return false;
+
+ switch (type) {
+ case GraphicsContext3D::UNSIGNED_BYTE:
+ case GraphicsContext3D::UNSIGNED_SHORT:
+ break;
+ case GraphicsContext3D::UNSIGNED_INT:
+ if (m_oesElementIndexUint || isWebGL2())
+ break;
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, functionName, "invalid type");
+ return false;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, functionName, "invalid type");
+ return false;
+ }
+
+ if (count < 0 || offset < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "count or offset < 0");
+ return false;
+ }
+
+ if (!count) {
+ markContextChanged();
+ return false;
+ }
+
+ if (primitiveCount < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "primcount < 0");
+ return false;
+ }
+
+ if (!m_boundVertexArrayObject->getElementArrayBuffer()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "no ELEMENT_ARRAY_BUFFER bound");
+ return false;
+ }
+
+ if (!isErrorGeneratedOnOutOfBoundsAccesses()) {
+ // Ensure we have a valid rendering state
+ if (!validateElementArraySize(count, type, static_cast<GC3Dintptr>(offset))) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "request out of bounds for current ELEMENT_ARRAY_BUFFER");
+ return false;
+ }
+ if (!count)
+ return false;
+
+ Checked<GC3Dint, RecordOverflow> checkedCount(count);
+ Checked<GC3Dint, RecordOverflow> checkedPrimitiveCount(primitiveCount);
+ if (checkedCount.hasOverflowed() || checkedPrimitiveCount.hasOverflowed()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "attempt to access out of bounds arrays");
+ return false;
+ }
+
+ if (!validateIndexArrayConservative(type, numElements) || !validateVertexAttributes(numElements, checkedPrimitiveCount.unsafeGet())) {
+ if (!validateIndexArrayPrecise(checkedCount.unsafeGet(), type, static_cast<GC3Dintptr>(offset), numElements) || !validateVertexAttributes(numElements, checkedPrimitiveCount.unsafeGet())) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "attempt to access out of bounds arrays");
+ return false;
+ }
+ }
+ } else {
+ if (!validateVertexAttributes(0)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "attribs not setup correctly");
+ return false;
+ }
+ }
+
+ const char* reason = "framebuffer incomplete";
+ if (m_framebufferBinding && !m_framebufferBinding->onAccess(graphicsContext3D(), !isResourceSafe(), &reason)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_FRAMEBUFFER_OPERATION, functionName, reason);
+ return false;
+ }
+
+ return true;
+}
+
+void WebGLRenderingContextBase::drawArrays(GC3Denum mode, GC3Dint first, GC3Dsizei count, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+
+ if (!validateDrawArrays("drawArrays", mode, first, count, 0))
+ return;
+
+ clearIfComposited();
+
+ bool vertexAttrib0Simulated = false;
+ if (!isGLES2Compliant())
+ vertexAttrib0Simulated = simulateVertexAttrib0(first + count - 1);
+ if (!isGLES2NPOTStrict())
+ checkTextureCompleteness("drawArrays", true);
+
+ m_context->drawArrays(mode, first, count);
+
+ if (!isGLES2Compliant() && vertexAttrib0Simulated)
+ restoreStatesAfterVertexAttrib0Simulation();
+ if (!isGLES2NPOTStrict())
+ checkTextureCompleteness("drawArrays", false);
+ markContextChanged();
+}
+
+void WebGLRenderingContextBase::drawElements(GC3Denum mode, GC3Dsizei count, GC3Denum type, long long offset, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+
+ unsigned numElements = 0;
+ if (!validateDrawElements("drawElements", mode, count, type, offset, numElements, 0))
+ return;
+
+ clearIfComposited();
+
+ bool vertexAttrib0Simulated = false;
+ if (!isGLES2Compliant()) {
+ if (!numElements)
+ validateIndexArrayPrecise(count, type, static_cast<GC3Dintptr>(offset), numElements);
+ vertexAttrib0Simulated = simulateVertexAttrib0(numElements);
+ }
+ if (!isGLES2NPOTStrict())
+ checkTextureCompleteness("drawElements", true);
+
+ m_context->drawElements(mode, count, type, static_cast<GC3Dintptr>(offset));
+
+ if (!isGLES2Compliant() && vertexAttrib0Simulated)
+ restoreStatesAfterVertexAttrib0Simulation();
+ if (!isGLES2NPOTStrict())
+ checkTextureCompleteness("drawElements", false);
+ markContextChanged();
+}
+
+void WebGLRenderingContextBase::enable(GC3Denum cap)
+{
+ if (isContextLostOrPending() || !validateCapability("enable", cap))
+ return;
+ if (cap == GraphicsContext3D::STENCIL_TEST) {
+ m_stencilEnabled = true;
+ applyStencilTest();
+ return;
+ }
+ if (cap == GraphicsContext3D::SCISSOR_TEST)
+ m_scissorEnabled = true;
+ m_context->enable(cap);
+}
+
+void WebGLRenderingContextBase::enableVertexAttribArray(GC3Duint index, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return;
+ if (index >= m_maxVertexAttribs) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "enableVertexAttribArray", "index out of range");
+ return;
+ }
+
+ WebGLVertexArrayObjectBase::VertexAttribState& state = m_boundVertexArrayObject->getVertexAttribState(index);
+ state.enabled = true;
+
+ m_context->enableVertexAttribArray(index);
+}
+
+void WebGLRenderingContextBase::finish()
+{
+ if (isContextLostOrPending())
+ return;
+ m_context->finish();
+}
+
+void WebGLRenderingContextBase::flush()
+{
+ if (isContextLostOrPending())
+ return;
+ m_context->flush();
+}
+
+void WebGLRenderingContextBase::framebufferRenderbuffer(GC3Denum target, GC3Denum attachment, GC3Denum renderbuffertarget, WebGLRenderbuffer* buffer, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateFramebufferFuncParameters("framebufferRenderbuffer", target, attachment))
+ return;
+ if (renderbuffertarget != GraphicsContext3D::RENDERBUFFER) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "framebufferRenderbuffer", "invalid target");
+ return;
+ }
+ if (buffer && !buffer->validate(contextGroup(), this)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "framebufferRenderbuffer", "no buffer or buffer not from this context");
+ return;
+ }
+ // Don't allow the default framebuffer to be mutated; all current
+ // implementations use an FBO internally in place of the default
+ // FBO.
+ if (!m_framebufferBinding || !m_framebufferBinding->object()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "framebufferRenderbuffer", "no framebuffer bound");
+ return;
+ }
+ Platform3DObject bufferObject = objectOrZero(buffer);
+ switch (attachment) {
+ case GraphicsContext3D::DEPTH_STENCIL_ATTACHMENT:
+ m_context->framebufferRenderbuffer(target, GraphicsContext3D::DEPTH_ATTACHMENT, renderbuffertarget, bufferObject);
+ m_context->framebufferRenderbuffer(target, GraphicsContext3D::STENCIL_ATTACHMENT, renderbuffertarget, bufferObject);
+ break;
+ default:
+ m_context->framebufferRenderbuffer(target, attachment, renderbuffertarget, bufferObject);
+ }
+ m_framebufferBinding->setAttachmentForBoundFramebuffer(attachment, buffer);
+ applyStencilTest();
+}
+
+void WebGLRenderingContextBase::framebufferTexture2D(GC3Denum target, GC3Denum attachment, GC3Denum textarget, WebGLTexture* texture, GC3Dint level, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateFramebufferFuncParameters("framebufferTexture2D", target, attachment))
+ return;
+ if (level) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "framebufferTexture2D", "level not 0");
+ return;
+ }
+ if (texture && !texture->validate(contextGroup(), this)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "framebufferTexture2D", "no texture or texture not from this context");
+ return;
+ }
+ // Don't allow the default framebuffer to be mutated; all current
+ // implementations use an FBO internally in place of the default
+ // FBO.
+ if (!m_framebufferBinding || !m_framebufferBinding->object()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "framebufferTexture2D", "no framebuffer bound");
+ return;
+ }
+ Platform3DObject textureObject = objectOrZero(texture);
+ switch (attachment) {
+ case GraphicsContext3D::DEPTH_STENCIL_ATTACHMENT:
+ m_context->framebufferTexture2D(target, GraphicsContext3D::DEPTH_ATTACHMENT, textarget, textureObject, level);
+ m_context->framebufferTexture2D(target, GraphicsContext3D::STENCIL_ATTACHMENT, textarget, textureObject, level);
+ break;
+ case GraphicsContext3D::DEPTH_ATTACHMENT:
+ m_context->framebufferTexture2D(target, attachment, textarget, textureObject, level);
+ break;
+ case GraphicsContext3D::STENCIL_ATTACHMENT:
+ m_context->framebufferTexture2D(target, attachment, textarget, textureObject, level);
+ break;
+ default:
+ m_context->framebufferTexture2D(target, attachment, textarget, textureObject, level);
+ }
+ m_framebufferBinding->setAttachmentForBoundFramebuffer(attachment, textarget, texture, level);
+ applyStencilTest();
+}
+
+void WebGLRenderingContextBase::frontFace(GC3Denum mode)
+{
+ if (isContextLostOrPending())
+ return;
+ m_context->frontFace(mode);
+}
+
+void WebGLRenderingContextBase::generateMipmap(GC3Denum target)
+{
+ if (isContextLostOrPending())
+ return;
+ WebGLTexture* tex = validateTextureBinding("generateMipmap", target, false);
+ if (!tex)
+ return;
+ if (!tex->canGenerateMipmaps()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "generateMipmap", "level 0 not power of 2 or not all the same size");
+ return;
+ }
+ // FIXME: https://bugs.webkit.org/show_bug.cgi?id=123916. Compressed textures should be allowed in WebGL 2:
+ if (tex->isCompressed()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "generateMipmap", "trying to generate mipmaps from compressed texture");
+ return;
+ }
+ if (!validateSettableTexFormat("generateMipmap", tex->getInternalFormat(target, 0)))
+ return;
+
+ // generateMipmap won't work properly if minFilter is not NEAREST_MIPMAP_LINEAR
+ // on Mac. Remove the hack once this driver bug is fixed.
+#if OS(DARWIN)
+ bool needToResetMinFilter = false;
+ if (tex->getMinFilter() != GraphicsContext3D::NEAREST_MIPMAP_LINEAR) {
+ m_context->texParameteri(target, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::NEAREST_MIPMAP_LINEAR);
+ needToResetMinFilter = true;
+ }
+#endif
+ m_context->generateMipmap(target);
+#if OS(DARWIN)
+ if (needToResetMinFilter)
+ m_context->texParameteri(target, GraphicsContext3D::TEXTURE_MIN_FILTER, tex->getMinFilter());
+#endif
+ tex->generateMipmapLevelInfo();
+}
+
+PassRefPtr<WebGLActiveInfo> WebGLRenderingContextBase::getActiveAttrib(WebGLProgram* program, GC3Duint index, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("getActiveAttrib", program))
+ return nullptr;
+ ActiveInfo info;
+ if (!m_context->getActiveAttrib(objectOrZero(program), index, info))
+ return nullptr;
+
+ LOG(WebGL, "Returning active attribute %d: %s", index, info.name.utf8().data());
+
+ return WebGLActiveInfo::create(info.name, info.type, info.size);
+}
+
+PassRefPtr<WebGLActiveInfo> WebGLRenderingContextBase::getActiveUniform(WebGLProgram* program, GC3Duint index, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("getActiveUniform", program))
+ return 0;
+ ActiveInfo info;
+ if (!m_context->getActiveUniform(objectOrZero(program), index, info))
+ return nullptr;
+ if (!isGLES2Compliant())
+ if (info.size > 1 && !info.name.endsWith("[0]"))
+ info.name.append("[0]");
+
+ LOG(WebGL, "Returning active uniform %d: %s", index, info.name.utf8().data());
+
+ return WebGLActiveInfo::create(info.name, info.type, info.size);
+}
+
+bool WebGLRenderingContextBase::getAttachedShaders(WebGLProgram* program, Vector<RefPtr<WebGLShader>>& shaderObjects, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ shaderObjects.clear();
+ if (isContextLostOrPending() || !validateWebGLObject("getAttachedShaders", program))
+ return false;
+
+ const GC3Denum shaderType[] = {
+ GraphicsContext3D::VERTEX_SHADER,
+ GraphicsContext3D::FRAGMENT_SHADER
+ };
+ for (unsigned i = 0; i < sizeof(shaderType) / sizeof(GC3Denum); ++i) {
+ WebGLShader* shader = program->getAttachedShader(shaderType[i]);
+ if (shader)
+ shaderObjects.append(shader);
+ }
+ return true;
+}
+
+GC3Dint WebGLRenderingContextBase::getAttribLocation(WebGLProgram* program, const String& name)
+{
+ if (isContextLostOrPending() || !validateWebGLObject("getAttribLocation", program))
+ return -1;
+ if (!validateLocationLength("getAttribLocation", name))
+ return -1;
+ if (!validateString("getAttribLocation", name))
+ return -1;
+ if (isPrefixReserved(name))
+ return -1;
+ if (!program->getLinkStatus()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "getAttribLocation", "program not linked");
+ return -1;
+ }
+ return m_context->getAttribLocation(objectOrZero(program), name);
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getBufferParameter(GC3Denum target, GC3Denum pname, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return WebGLGetInfo();
+ if (target != GraphicsContext3D::ARRAY_BUFFER && target != GraphicsContext3D::ELEMENT_ARRAY_BUFFER) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "getBufferParameter", "invalid target");
+ return WebGLGetInfo();
+ }
+
+ if (pname != GraphicsContext3D::BUFFER_SIZE && pname != GraphicsContext3D::BUFFER_USAGE) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "getBufferParameter", "invalid parameter name");
+ return WebGLGetInfo();
+ }
+
+ GC3Dint value = 0;
+ m_context->getBufferParameteriv(target, pname, &value);
+ if (pname == GraphicsContext3D::BUFFER_SIZE)
+ return WebGLGetInfo(value);
+ return WebGLGetInfo(static_cast<unsigned int>(value));
+}
+
+PassRefPtr<WebGLContextAttributes> WebGLRenderingContextBase::getContextAttributes()
+{
+ if (isContextLostOrPending())
+ return nullptr;
+ // We always need to return a new WebGLContextAttributes object to
+ // prevent the user from mutating any cached version.
+
+ // Also, we need to enforce requested values of "false" for depth
+ // and stencil, regardless of the properties of the underlying
+ // GraphicsContext3D.
+ RefPtr<WebGLContextAttributes> attributes = WebGLContextAttributes::create(m_context->getContextAttributes());
+ if (!m_attributes.depth)
+ attributes->setDepth(false);
+ if (!m_attributes.stencil)
+ attributes->setStencil(false);
+ return attributes.release();
+}
+
+GC3Denum WebGLRenderingContextBase::getError()
+{
+ if (m_isPendingPolicyResolution)
+ return GraphicsContext3D::NO_ERROR;
+ return m_context->getError();
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getProgramParameter(WebGLProgram* program, GC3Denum pname, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("getProgramParameter", program))
+ return WebGLGetInfo();
+
+ GC3Dint value = 0;
+ switch (pname) {
+ case GraphicsContext3D::DELETE_STATUS:
+ return WebGLGetInfo(program->isDeleted());
+ case GraphicsContext3D::VALIDATE_STATUS:
+ m_context->getProgramiv(objectOrZero(program), pname, &value);
+ return WebGLGetInfo(static_cast<bool>(value));
+ case GraphicsContext3D::LINK_STATUS:
+ return WebGLGetInfo(program->getLinkStatus());
+ case GraphicsContext3D::ATTACHED_SHADERS:
+ m_context->getProgramiv(objectOrZero(program), pname, &value);
+ return WebGLGetInfo(value);
+ case GraphicsContext3D::ACTIVE_ATTRIBUTES:
+ case GraphicsContext3D::ACTIVE_UNIFORMS:
+ m_context->getNonBuiltInActiveSymbolCount(objectOrZero(program), pname, &value);
+ return WebGLGetInfo(value);
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "getProgramParameter", "invalid parameter name");
+ return WebGLGetInfo();
+ }
+}
+
+String WebGLRenderingContextBase::getProgramInfoLog(WebGLProgram* program, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("getProgramInfoLog", program))
+ return String();
+ return ensureNotNull(m_context->getProgramInfoLog(objectOrZero(program)));
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getRenderbufferParameter(GC3Denum target, GC3Denum pname, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return WebGLGetInfo();
+ if (target != GraphicsContext3D::RENDERBUFFER) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "getRenderbufferParameter", "invalid target");
+ return WebGLGetInfo();
+ }
+ if (!m_renderbufferBinding || !m_renderbufferBinding->object()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "getRenderbufferParameter", "no renderbuffer bound");
+ return WebGLGetInfo();
+ }
+
+ if (m_renderbufferBinding->getInternalFormat() == GraphicsContext3D::DEPTH_STENCIL
+ && !m_renderbufferBinding->isValid()) {
+ ASSERT(!isDepthStencilSupported());
+ int value = 0;
+ switch (pname) {
+ case GraphicsContext3D::RENDERBUFFER_WIDTH:
+ value = m_renderbufferBinding->getWidth();
+ break;
+ case GraphicsContext3D::RENDERBUFFER_HEIGHT:
+ value = m_renderbufferBinding->getHeight();
+ break;
+ case GraphicsContext3D::RENDERBUFFER_RED_SIZE:
+ case GraphicsContext3D::RENDERBUFFER_GREEN_SIZE:
+ case GraphicsContext3D::RENDERBUFFER_BLUE_SIZE:
+ case GraphicsContext3D::RENDERBUFFER_ALPHA_SIZE:
+ value = 0;
+ break;
+ case GraphicsContext3D::RENDERBUFFER_DEPTH_SIZE:
+ value = 24;
+ break;
+ case GraphicsContext3D::RENDERBUFFER_STENCIL_SIZE:
+ value = 8;
+ break;
+ case GraphicsContext3D::RENDERBUFFER_INTERNAL_FORMAT:
+ return WebGLGetInfo(m_renderbufferBinding->getInternalFormat());
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "getRenderbufferParameter", "invalid parameter name");
+ return WebGLGetInfo();
+ }
+ return WebGLGetInfo(value);
+ }
+
+ GC3Dint value = 0;
+ switch (pname) {
+ case GraphicsContext3D::RENDERBUFFER_WIDTH:
+ case GraphicsContext3D::RENDERBUFFER_HEIGHT:
+ case GraphicsContext3D::RENDERBUFFER_RED_SIZE:
+ case GraphicsContext3D::RENDERBUFFER_GREEN_SIZE:
+ case GraphicsContext3D::RENDERBUFFER_BLUE_SIZE:
+ case GraphicsContext3D::RENDERBUFFER_ALPHA_SIZE:
+ case GraphicsContext3D::RENDERBUFFER_DEPTH_SIZE:
+ case GraphicsContext3D::RENDERBUFFER_STENCIL_SIZE:
+ m_context->getRenderbufferParameteriv(target, pname, &value);
+ return WebGLGetInfo(value);
+ case GraphicsContext3D::RENDERBUFFER_INTERNAL_FORMAT:
+ return WebGLGetInfo(m_renderbufferBinding->getInternalFormat());
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "getRenderbufferParameter", "invalid parameter name");
+ return WebGLGetInfo();
+ }
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getShaderParameter(WebGLShader* shader, GC3Denum pname, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("getShaderParameter", shader))
+ return WebGLGetInfo();
+ GC3Dint value = 0;
+ switch (pname) {
+ case GraphicsContext3D::DELETE_STATUS:
+ return WebGLGetInfo(shader->isDeleted());
+ case GraphicsContext3D::COMPILE_STATUS:
+ m_context->getShaderiv(objectOrZero(shader), pname, &value);
+ return WebGLGetInfo(static_cast<bool>(value));
+ case GraphicsContext3D::SHADER_TYPE:
+ m_context->getShaderiv(objectOrZero(shader), pname, &value);
+ return WebGLGetInfo(static_cast<unsigned int>(value));
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "getShaderParameter", "invalid parameter name");
+ return WebGLGetInfo();
+ }
+}
+
+String WebGLRenderingContextBase::getShaderInfoLog(WebGLShader* shader, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("getShaderInfoLog", shader))
+ return String();
+ return ensureNotNull(m_context->getShaderInfoLog(objectOrZero(shader)));
+}
+
+PassRefPtr<WebGLShaderPrecisionFormat> WebGLRenderingContextBase::getShaderPrecisionFormat(GC3Denum shaderType, GC3Denum precisionType, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return nullptr;
+ switch (shaderType) {
+ case GraphicsContext3D::VERTEX_SHADER:
+ case GraphicsContext3D::FRAGMENT_SHADER:
+ break;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "getShaderPrecisionFormat", "invalid shader type");
+ return nullptr;
+ }
+ switch (precisionType) {
+ case GraphicsContext3D::LOW_FLOAT:
+ case GraphicsContext3D::MEDIUM_FLOAT:
+ case GraphicsContext3D::HIGH_FLOAT:
+ case GraphicsContext3D::LOW_INT:
+ case GraphicsContext3D::MEDIUM_INT:
+ case GraphicsContext3D::HIGH_INT:
+ break;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "getShaderPrecisionFormat", "invalid precision type");
+ return nullptr;
+ }
+
+ GC3Dint range[2] = {0, 0};
+ GC3Dint precision = 0;
+ m_context->getShaderPrecisionFormat(shaderType, precisionType, range, &precision);
+ return WebGLShaderPrecisionFormat::create(range[0], range[1], precision);
+}
+
+String WebGLRenderingContextBase::getShaderSource(WebGLShader* shader, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("getShaderSource", shader))
+ return String();
+ return ensureNotNull(shader->getSource());
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getTexParameter(GC3Denum target, GC3Denum pname, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return WebGLGetInfo();
+ WebGLTexture* tex = validateTextureBinding("getTexParameter", target, false);
+ if (!tex)
+ return WebGLGetInfo();
+ GC3Dint value = 0;
+ switch (pname) {
+ case GraphicsContext3D::TEXTURE_MAG_FILTER:
+ case GraphicsContext3D::TEXTURE_MIN_FILTER:
+ case GraphicsContext3D::TEXTURE_WRAP_S:
+ case GraphicsContext3D::TEXTURE_WRAP_T:
+ m_context->getTexParameteriv(target, pname, &value);
+ return WebGLGetInfo(static_cast<unsigned int>(value));
+ case Extensions3D::TEXTURE_MAX_ANISOTROPY_EXT: // EXT_texture_filter_anisotropic
+ if (m_extTextureFilterAnisotropic) {
+ m_context->getTexParameteriv(target, pname, &value);
+ return WebGLGetInfo(static_cast<unsigned int>(value));
+ }
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "getTexParameter", "invalid parameter name, EXT_texture_filter_anisotropic not enabled");
+ return WebGLGetInfo();
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "getTexParameter", "invalid parameter name");
+ return WebGLGetInfo();
+ }
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getUniform(WebGLProgram* program, const WebGLUniformLocation* uniformLocation, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("getUniform", program))
+ return WebGLGetInfo();
+ if (!uniformLocation || uniformLocation->program() != program) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "getUniform", "no uniformlocation or not valid for this program");
+ return WebGLGetInfo();
+ }
+ GC3Dint location = uniformLocation->location();
+
+ GC3Denum baseType;
+ unsigned length;
+ switch (uniformLocation->type()) {
+ case GraphicsContext3D::BOOL:
+ baseType = GraphicsContext3D::BOOL;
+ length = 1;
+ break;
+ case GraphicsContext3D::BOOL_VEC2:
+ baseType = GraphicsContext3D::BOOL;
+ length = 2;
+ break;
+ case GraphicsContext3D::BOOL_VEC3:
+ baseType = GraphicsContext3D::BOOL;
+ length = 3;
+ break;
+ case GraphicsContext3D::BOOL_VEC4:
+ baseType = GraphicsContext3D::BOOL;
+ length = 4;
+ break;
+ case GraphicsContext3D::INT:
+ baseType = GraphicsContext3D::INT;
+ length = 1;
+ break;
+ case GraphicsContext3D::INT_VEC2:
+ baseType = GraphicsContext3D::INT;
+ length = 2;
+ break;
+ case GraphicsContext3D::INT_VEC3:
+ baseType = GraphicsContext3D::INT;
+ length = 3;
+ break;
+ case GraphicsContext3D::INT_VEC4:
+ baseType = GraphicsContext3D::INT;
+ length = 4;
+ break;
+ case GraphicsContext3D::FLOAT:
+ baseType = GraphicsContext3D::FLOAT;
+ length = 1;
+ break;
+ case GraphicsContext3D::FLOAT_VEC2:
+ baseType = GraphicsContext3D::FLOAT;
+ length = 2;
+ break;
+ case GraphicsContext3D::FLOAT_VEC3:
+ baseType = GraphicsContext3D::FLOAT;
+ length = 3;
+ break;
+ case GraphicsContext3D::FLOAT_VEC4:
+ baseType = GraphicsContext3D::FLOAT;
+ length = 4;
+ break;
+ case GraphicsContext3D::FLOAT_MAT2:
+ baseType = GraphicsContext3D::FLOAT;
+ length = 4;
+ break;
+ case GraphicsContext3D::FLOAT_MAT3:
+ baseType = GraphicsContext3D::FLOAT;
+ length = 9;
+ break;
+ case GraphicsContext3D::FLOAT_MAT4:
+ baseType = GraphicsContext3D::FLOAT;
+ length = 16;
+ break;
+ case GraphicsContext3D::SAMPLER_2D:
+ case GraphicsContext3D::SAMPLER_CUBE:
+ baseType = GraphicsContext3D::INT;
+ length = 1;
+ break;
+ default:
+ // Can't handle this type
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "getUniform", "unhandled type");
+ return WebGLGetInfo();
+ }
+ switch (baseType) {
+ case GraphicsContext3D::FLOAT: {
+ GC3Dfloat value[16] = {0};
+ if (m_isRobustnessEXTSupported)
+ m_context->getExtensions()->getnUniformfvEXT(objectOrZero(program), location, 16 * sizeof(GC3Dfloat), value);
+ else
+ m_context->getUniformfv(objectOrZero(program), location, value);
+ if (length == 1)
+ return WebGLGetInfo(value[0]);
+ return WebGLGetInfo(Float32Array::create(value, length).release());
+ }
+ case GraphicsContext3D::INT: {
+ GC3Dint value[4] = {0};
+ if (m_isRobustnessEXTSupported)
+ m_context->getExtensions()->getnUniformivEXT(objectOrZero(program), location, 4 * sizeof(GC3Dint), value);
+ else
+ m_context->getUniformiv(objectOrZero(program), location, value);
+ if (length == 1)
+ return WebGLGetInfo(value[0]);
+ return WebGLGetInfo(Int32Array::create(value, length).release());
+ }
+ case GraphicsContext3D::BOOL: {
+ GC3Dint value[4] = {0};
+ if (m_isRobustnessEXTSupported)
+ m_context->getExtensions()->getnUniformivEXT(objectOrZero(program), location, 4 * sizeof(GC3Dint), value);
+ else
+ m_context->getUniformiv(objectOrZero(program), location, value);
+ if (length > 1) {
+ bool boolValue[16] = {0};
+ for (unsigned j = 0; j < length; j++)
+ boolValue[j] = static_cast<bool>(value[j]);
+ return WebGLGetInfo(boolValue, length);
+ }
+ return WebGLGetInfo(static_cast<bool>(value[0]));
+ }
+ default:
+ notImplemented();
+ }
+
+ // If we get here, something went wrong in our unfortunately complex logic above
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "getUniform", "unknown error");
+ return WebGLGetInfo();
+}
+
+PassRefPtr<WebGLUniformLocation> WebGLRenderingContextBase::getUniformLocation(WebGLProgram* program, const String& name, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("getUniformLocation", program))
+ return nullptr;
+ if (!validateLocationLength("getUniformLocation", name))
+ return nullptr;
+ if (!validateString("getUniformLocation", name))
+ return nullptr;
+ if (isPrefixReserved(name))
+ return nullptr;
+ if (!program->getLinkStatus()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "getUniformLocation", "program not linked");
+ return nullptr;
+ }
+ GC3Dint uniformLocation = m_context->getUniformLocation(objectOrZero(program), name);
+ if (uniformLocation == -1)
+ return nullptr;
+
+ GC3Dint activeUniforms = 0;
+ m_context->getNonBuiltInActiveSymbolCount(objectOrZero(program), GraphicsContext3D::ACTIVE_UNIFORMS, &activeUniforms);
+ for (GC3Dint i = 0; i < activeUniforms; i++) {
+ ActiveInfo info;
+ if (!m_context->getActiveUniform(objectOrZero(program), i, info))
+ return nullptr;
+ // Strip "[0]" from the name if it's an array.
+ if (info.name.endsWith("[0]"))
+ info.name = info.name.left(info.name.length() - 3);
+ // If it's an array, we need to iterate through each element, appending "[index]" to the name.
+ for (GC3Dint index = 0; index < info.size; ++index) {
+ String uniformName = info.name + "[" + String::number(index) + "]";
+
+ if (name == uniformName || name == info.name)
+ return WebGLUniformLocation::create(program, uniformLocation, info.type);
+ }
+ }
+ return nullptr;
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getVertexAttrib(GC3Duint index, GC3Denum pname, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+
+ if (isContextLostOrPending())
+ return WebGLGetInfo();
+
+ if (index >= m_maxVertexAttribs) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "getVertexAttrib", "index out of range");
+ return WebGLGetInfo();
+ }
+
+ const WebGLVertexArrayObjectBase::VertexAttribState& state = m_boundVertexArrayObject->getVertexAttribState(index);
+
+ if ((isWebGL2() || m_angleInstancedArrays) && pname == GraphicsContext3D::VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE)
+ return WebGLGetInfo(state.divisor);
+
+ switch (pname) {
+ case GraphicsContext3D::VERTEX_ATTRIB_ARRAY_BUFFER_BINDING:
+ if ((!isGLES2Compliant() && !index && m_boundVertexArrayObject->getVertexAttribState(0).bufferBinding == m_vertexAttrib0Buffer)
+ || !state.bufferBinding
+ || !state.bufferBinding->object())
+ return WebGLGetInfo();
+ return WebGLGetInfo(PassRefPtr<WebGLBuffer>(state.bufferBinding));
+ case GraphicsContext3D::VERTEX_ATTRIB_ARRAY_ENABLED:
+ return WebGLGetInfo(state.enabled);
+ case GraphicsContext3D::VERTEX_ATTRIB_ARRAY_NORMALIZED:
+ return WebGLGetInfo(state.normalized);
+ case GraphicsContext3D::VERTEX_ATTRIB_ARRAY_SIZE:
+ return WebGLGetInfo(state.size);
+ case GraphicsContext3D::VERTEX_ATTRIB_ARRAY_STRIDE:
+ return WebGLGetInfo(state.originalStride);
+ case GraphicsContext3D::VERTEX_ATTRIB_ARRAY_TYPE:
+ return WebGLGetInfo(state.type);
+ case GraphicsContext3D::CURRENT_VERTEX_ATTRIB:
+ return WebGLGetInfo(Float32Array::create(m_vertexAttribValue[index].value, 4).release());
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "getVertexAttrib", "invalid parameter name");
+ return WebGLGetInfo();
+ }
+}
+
+long long WebGLRenderingContextBase::getVertexAttribOffset(GC3Duint index, GC3Denum pname)
+{
+ if (isContextLostOrPending())
+ return 0;
+ GC3Dsizeiptr result = m_context->getVertexAttribOffset(index, pname);
+ return static_cast<long long>(result);
+}
+
+GC3Dboolean WebGLRenderingContextBase::isBuffer(WebGLBuffer* buffer)
+{
+ if (!buffer || isContextLostOrPending())
+ return 0;
+
+ if (!buffer->hasEverBeenBound())
+ return 0;
+
+ return m_context->isBuffer(buffer->object());
+}
+
+bool WebGLRenderingContextBase::isContextLost() const
+{
+ return m_contextLost;
+}
+
+bool WebGLRenderingContextBase::isContextLostOrPending()
+{
+ if (m_isPendingPolicyResolution && !m_hasRequestedPolicyResolution) {
+ LOG(WebGL, "Context is being used. Attempt to resolve the policy.");
+ Document& document = canvas()->document().topDocument();
+ Page* page = document.page();
+ if (page && !document.url().isLocalFile())
+ page->mainFrame().loader().client().resolveWebGLPolicyForURL(document.url());
+ // FIXME: We don't currently do anything with the result from resolution. A more
+ // complete implementation might try to construct a real context, etc and proceed
+ // with normal operation.
+ // https://bugs.webkit.org/show_bug.cgi?id=129122
+ m_hasRequestedPolicyResolution = true;
+ }
+
+ return m_contextLost || m_isPendingPolicyResolution;
+}
+
+GC3Dboolean WebGLRenderingContextBase::isEnabled(GC3Denum cap)
+{
+ if (isContextLostOrPending() || !validateCapability("isEnabled", cap))
+ return 0;
+ if (cap == GraphicsContext3D::STENCIL_TEST)
+ return m_stencilEnabled;
+ return m_context->isEnabled(cap);
+}
+
+GC3Dboolean WebGLRenderingContextBase::isFramebuffer(WebGLFramebuffer* framebuffer)
+{
+ if (!framebuffer || isContextLostOrPending())
+ return 0;
+
+ if (!framebuffer->hasEverBeenBound())
+ return 0;
+
+ return m_context->isFramebuffer(framebuffer->object());
+}
+
+GC3Dboolean WebGLRenderingContextBase::isProgram(WebGLProgram* program)
+{
+ if (!program || isContextLostOrPending())
+ return 0;
+
+ return m_context->isProgram(program->object());
+}
+
+GC3Dboolean WebGLRenderingContextBase::isRenderbuffer(WebGLRenderbuffer* renderbuffer)
+{
+ if (!renderbuffer || isContextLostOrPending())
+ return 0;
+
+ if (!renderbuffer->hasEverBeenBound())
+ return 0;
+
+ return m_context->isRenderbuffer(renderbuffer->object());
+}
+
+GC3Dboolean WebGLRenderingContextBase::isShader(WebGLShader* shader)
+{
+ if (!shader || isContextLostOrPending())
+ return 0;
+
+ return m_context->isShader(shader->object());
+}
+
+GC3Dboolean WebGLRenderingContextBase::isTexture(WebGLTexture* texture)
+{
+ if (!texture || isContextLostOrPending())
+ return 0;
+
+ if (!texture->hasEverBeenBound())
+ return 0;
+
+ return m_context->isTexture(texture->object());
+}
+
+void WebGLRenderingContextBase::lineWidth(GC3Dfloat width)
+{
+ if (isContextLostOrPending())
+ return;
+ m_context->lineWidth(width);
+}
+
+void WebGLRenderingContextBase::linkProgram(WebGLProgram* program, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("linkProgram", program))
+ return;
+ if (!isGLES2Compliant()) {
+ WebGLShader* vertexShader = program->getAttachedShader(GraphicsContext3D::VERTEX_SHADER);
+ WebGLShader* fragmentShader = program->getAttachedShader(GraphicsContext3D::FRAGMENT_SHADER);
+ if (!vertexShader || !vertexShader->isValid() || !fragmentShader || !fragmentShader->isValid() || !m_context->precisionsMatch(objectOrZero(vertexShader), objectOrZero(fragmentShader)) || !m_context->checkVaryingsPacking(objectOrZero(vertexShader), objectOrZero(fragmentShader))) {
+ program->setLinkStatus(false);
+ return;
+ }
+ }
+
+ m_context->linkProgram(objectOrZero(program));
+ program->increaseLinkCount();
+}
+
+void WebGLRenderingContextBase::pixelStorei(GC3Denum pname, GC3Dint param)
+{
+ if (isContextLostOrPending())
+ return;
+ switch (pname) {
+ case GraphicsContext3D::UNPACK_FLIP_Y_WEBGL:
+ m_unpackFlipY = param;
+ break;
+ case GraphicsContext3D::UNPACK_PREMULTIPLY_ALPHA_WEBGL:
+ m_unpackPremultiplyAlpha = param;
+ break;
+ case GraphicsContext3D::UNPACK_COLORSPACE_CONVERSION_WEBGL:
+ if (param == GraphicsContext3D::BROWSER_DEFAULT_WEBGL || param == GraphicsContext3D::NONE)
+ m_unpackColorspaceConversion = static_cast<GC3Denum>(param);
+ else {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "pixelStorei", "invalid parameter for UNPACK_COLORSPACE_CONVERSION_WEBGL");
+ return;
+ }
+ break;
+ case GraphicsContext3D::PACK_ALIGNMENT:
+ case GraphicsContext3D::UNPACK_ALIGNMENT:
+ if (param == 1 || param == 2 || param == 4 || param == 8) {
+ if (pname == GraphicsContext3D::PACK_ALIGNMENT)
+ m_packAlignment = param;
+ else // GraphicsContext3D::UNPACK_ALIGNMENT:
+ m_unpackAlignment = param;
+ m_context->pixelStorei(pname, param);
+ } else {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "pixelStorei", "invalid parameter for alignment");
+ return;
+ }
+ break;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "pixelStorei", "invalid parameter name");
+ return;
+ }
+}
+
+void WebGLRenderingContextBase::polygonOffset(GC3Dfloat factor, GC3Dfloat units)
+{
+ if (isContextLostOrPending())
+ return;
+ m_context->polygonOffset(factor, units);
+}
+
+void WebGLRenderingContextBase::readPixels(GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height, GC3Denum format, GC3Denum type, ArrayBufferView* pixels, ExceptionCode&)
+{
+ if (isContextLostOrPending())
+ return;
+ // Due to WebGL's same-origin restrictions, it is not possible to
+ // taint the origin using the WebGL API.
+ ASSERT(canvas()->originClean());
+ // Validate input parameters.
+ if (!pixels) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "readPixels", "no destination ArrayBufferView");
+ return;
+ }
+ switch (format) {
+ case GraphicsContext3D::ALPHA:
+ case GraphicsContext3D::RGB:
+ case GraphicsContext3D::RGBA:
+ break;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "readPixels", "invalid format");
+ return;
+ }
+ switch (type) {
+ case GraphicsContext3D::UNSIGNED_BYTE:
+ case GraphicsContext3D::UNSIGNED_SHORT_5_6_5:
+ case GraphicsContext3D::UNSIGNED_SHORT_4_4_4_4:
+ case GraphicsContext3D::UNSIGNED_SHORT_5_5_5_1:
+ break;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "readPixels", "invalid type");
+ return;
+ }
+ if (format != GraphicsContext3D::RGBA || type != GraphicsContext3D::UNSIGNED_BYTE) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "readPixels", "format not RGBA or type not UNSIGNED_BYTE");
+ return;
+ }
+ // Validate array type against pixel type.
+ if (pixels->getType() != JSC::TypeUint8) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "readPixels", "ArrayBufferView not Uint8Array");
+ return;
+ }
+ const char* reason = "framebuffer incomplete";
+ if (m_framebufferBinding && !m_framebufferBinding->onAccess(graphicsContext3D(), !isResourceSafe(), &reason)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_FRAMEBUFFER_OPERATION, "readPixels", reason);
+ return;
+ }
+ // Calculate array size, taking into consideration of PACK_ALIGNMENT.
+ unsigned int totalBytesRequired = 0;
+ unsigned int padding = 0;
+ if (!m_isRobustnessEXTSupported) {
+ GC3Denum error = m_context->computeImageSizeInBytes(format, type, width, height, m_packAlignment, &totalBytesRequired, &padding);
+ if (error != GraphicsContext3D::NO_ERROR) {
+ synthesizeGLError(error, "readPixels", "invalid dimensions");
+ return;
+ }
+ if (pixels->byteLength() < totalBytesRequired) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "readPixels", "ArrayBufferView not large enough for dimensions");
+ return;
+ }
+ }
+
+ clearIfComposited();
+ void* data = pixels->baseAddress();
+
+ {
+ if (m_isRobustnessEXTSupported)
+ m_context->getExtensions()->readnPixelsEXT(x, y, width, height, format, type, pixels->byteLength(), data);
+ else
+ m_context->readPixels(x, y, width, height, format, type, data);
+ }
+
+#if OS(DARWIN)
+ if (m_isRobustnessEXTSupported) // we haven't computed padding
+ m_context->computeImageSizeInBytes(format, type, width, height, m_packAlignment, &totalBytesRequired, &padding);
+ // FIXME: remove this section when GL driver bug on Mac AND the GLES driver bug
+ // on QC is fixed, i.e., when alpha is off, readPixels should
+ // set alpha to 255 instead of 0.
+ if (!m_framebufferBinding && !m_context->getContextAttributes().alpha) {
+ unsigned char* pixels = reinterpret_cast<unsigned char*>(data);
+ for (GC3Dsizei iy = 0; iy < height; ++iy) {
+ for (GC3Dsizei ix = 0; ix < width; ++ix) {
+ pixels[3] = 255;
+ pixels += 4;
+ }
+ pixels += padding;
+ }
+ }
+#endif
+}
+
+void WebGLRenderingContextBase::releaseShaderCompiler()
+{
+ if (isContextLostOrPending())
+ return;
+ m_context->releaseShaderCompiler();
+}
+
+void WebGLRenderingContextBase::sampleCoverage(GC3Dfloat value, GC3Dboolean invert)
+{
+ if (isContextLostOrPending())
+ return;
+ m_context->sampleCoverage(value, invert);
+}
+
+void WebGLRenderingContextBase::scissor(GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height)
+{
+ if (isContextLostOrPending())
+ return;
+ if (!validateSize("scissor", width, height))
+ return;
+ m_context->scissor(x, y, width, height);
+}
+
+void WebGLRenderingContextBase::shaderSource(WebGLShader* shader, const String& string, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("shaderSource", shader))
+ return;
+ String stringWithoutComments = StripComments(string).result();
+ if (!validateString("shaderSource", stringWithoutComments))
+ return;
+ shader->setSource(string);
+ m_context->shaderSource(objectOrZero(shader), stringWithoutComments);
+}
+
+void WebGLRenderingContextBase::stencilFunc(GC3Denum func, GC3Dint ref, GC3Duint mask)
+{
+ if (isContextLostOrPending())
+ return;
+ if (!validateStencilFunc("stencilFunc", func))
+ return;
+ m_stencilFuncRef = ref;
+ m_stencilFuncRefBack = ref;
+ m_stencilFuncMask = mask;
+ m_stencilFuncMaskBack = mask;
+ m_context->stencilFunc(func, ref, mask);
+}
+
+void WebGLRenderingContextBase::stencilFuncSeparate(GC3Denum face, GC3Denum func, GC3Dint ref, GC3Duint mask)
+{
+ if (isContextLostOrPending())
+ return;
+ if (!validateStencilFunc("stencilFuncSeparate", func))
+ return;
+ switch (face) {
+ case GraphicsContext3D::FRONT_AND_BACK:
+ m_stencilFuncRef = ref;
+ m_stencilFuncRefBack = ref;
+ m_stencilFuncMask = mask;
+ m_stencilFuncMaskBack = mask;
+ break;
+ case GraphicsContext3D::FRONT:
+ m_stencilFuncRef = ref;
+ m_stencilFuncMask = mask;
+ break;
+ case GraphicsContext3D::BACK:
+ m_stencilFuncRefBack = ref;
+ m_stencilFuncMaskBack = mask;
+ break;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "stencilFuncSeparate", "invalid face");
+ return;
+ }
+ m_context->stencilFuncSeparate(face, func, ref, mask);
+}
+
+void WebGLRenderingContextBase::stencilMask(GC3Duint mask)
+{
+ if (isContextLostOrPending())
+ return;
+ m_stencilMask = mask;
+ m_stencilMaskBack = mask;
+ m_context->stencilMask(mask);
+}
+
+void WebGLRenderingContextBase::stencilMaskSeparate(GC3Denum face, GC3Duint mask)
+{
+ if (isContextLostOrPending())
+ return;
+ switch (face) {
+ case GraphicsContext3D::FRONT_AND_BACK:
+ m_stencilMask = mask;
+ m_stencilMaskBack = mask;
+ break;
+ case GraphicsContext3D::FRONT:
+ m_stencilMask = mask;
+ break;
+ case GraphicsContext3D::BACK:
+ m_stencilMaskBack = mask;
+ break;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "stencilMaskSeparate", "invalid face");
+ return;
+ }
+ m_context->stencilMaskSeparate(face, mask);
+}
+
+void WebGLRenderingContextBase::stencilOp(GC3Denum fail, GC3Denum zfail, GC3Denum zpass)
+{
+ if (isContextLostOrPending())
+ return;
+ m_context->stencilOp(fail, zfail, zpass);
+}
+
+void WebGLRenderingContextBase::stencilOpSeparate(GC3Denum face, GC3Denum fail, GC3Denum zfail, GC3Denum zpass)
+{
+ if (isContextLostOrPending())
+ return;
+ m_context->stencilOpSeparate(face, fail, zfail, zpass);
+}
+
+void WebGLRenderingContextBase::texImage2DBase(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height, GC3Dint border, GC3Denum format, GC3Denum type, const void* pixels, ExceptionCode& ec)
+{
+ // FIXME: For now we ignore any errors returned.
+ ec = 0;
+ WebGLTexture* tex = validateTextureBinding("texImage2D", target, true);
+ ASSERT(validateTexFuncParameters("texImage2D", TexImage, target, level, internalformat, width, height, border, format, type));
+ ASSERT(tex);
+ ASSERT(!level || !WebGLTexture::isNPOT(width, height));
+ if (!pixels) {
+ // Note: Chromium's OpenGL implementation clears textures and isResourceSafe() is therefore true.
+ // For other implementations, if they are using ANGLE_depth_texture, ANGLE depth textures
+ // can not be cleared with texImage2D and must be cleared by binding to an fbo and calling
+ // clear.
+ if (isResourceSafe())
+ m_context->texImage2D(target, level, internalformat, width, height, border, format, type, nullptr);
+ else {
+ bool succeed = m_context->texImage2DResourceSafe(target, level, internalformat, width, height,
+ border, format, type, m_unpackAlignment);
+ if (!succeed)
+ return;
+ }
+ } else {
+ ASSERT(validateSettableTexFormat("texImage2D", internalformat));
+ m_context->moveErrorsToSyntheticErrorList();
+ m_context->texImage2D(target, level, internalformat, width, height,
+ border, format, type, pixels);
+ if (m_context->moveErrorsToSyntheticErrorList()) {
+ // The texImage2D function failed. Tell the WebGLTexture it doesn't have the data for this level.
+ tex->markInvalid(target, level);
+ return;
+ }
+ }
+ tex->setLevelInfo(target, level, internalformat, width, height, type);
+}
+
+void WebGLRenderingContextBase::texImage2DImpl(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Denum format, GC3Denum type, Image* image, GraphicsContext3D::ImageHtmlDomSource domSource, bool flipY, bool premultiplyAlpha, ExceptionCode& ec)
+{
+ ec = 0;
+ Vector<uint8_t> data;
+ GraphicsContext3D::ImageExtractor imageExtractor(image, domSource, premultiplyAlpha, m_unpackColorspaceConversion == GraphicsContext3D::NONE);
+ if (!imageExtractor.extractSucceeded()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "texImage2D", "bad image data");
+ return;
+ }
+ GraphicsContext3D::DataFormat sourceDataFormat = imageExtractor.imageSourceFormat();
+ GraphicsContext3D::AlphaOp alphaOp = imageExtractor.imageAlphaOp();
+ const void* imagePixelData = imageExtractor.imagePixelData();
+
+ bool needConversion = true;
+ if (type == GraphicsContext3D::UNSIGNED_BYTE && sourceDataFormat == GraphicsContext3D::DataFormatRGBA8 && format == GraphicsContext3D::RGBA && alphaOp == GraphicsContext3D::AlphaDoNothing && !flipY)
+ needConversion = false;
+ else {
+ if (!m_context->packImageData(image, imagePixelData, format, type, flipY, alphaOp, sourceDataFormat, imageExtractor.imageWidth(), imageExtractor.imageHeight(), imageExtractor.imageSourceUnpackAlignment(), data)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "texImage2D", "packImage error");
+ return;
+ }
+ }
+
+ if (m_unpackAlignment != 1)
+ m_context->pixelStorei(GraphicsContext3D::UNPACK_ALIGNMENT, 1);
+ texImage2DBase(target, level, internalformat, image->width(), image->height(), 0, format, type, needConversion ? data.data() : imagePixelData, ec);
+ if (m_unpackAlignment != 1)
+ m_context->pixelStorei(GraphicsContext3D::UNPACK_ALIGNMENT, m_unpackAlignment);
+}
+
+bool WebGLRenderingContextBase::validateTexFunc(const char* functionName, TexFuncValidationFunctionType functionType, TexFuncValidationSourceType sourceType, GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height, GC3Dint border, GC3Denum format, GC3Denum type, GC3Dint xoffset, GC3Dint yoffset)
+{
+ if (!validateTexFuncParameters(functionName, functionType, target, level, internalformat, width, height, border, format, type))
+ return false;
+
+ WebGLTexture* texture = validateTextureBinding(functionName, target, true);
+ if (!texture)
+ return false;
+
+ if (functionType != TexSubImage) {
+ if (level && WebGLTexture::isNPOT(width, height)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "level > 0 not power of 2");
+ return false;
+ }
+ // For SourceArrayBufferView, function validateTexFuncData() would handle whether to validate the SettableTexFormat
+ // by checking if the ArrayBufferView is null or not.
+ if (sourceType != SourceArrayBufferView) {
+ if (!validateSettableTexFormat(functionName, format))
+ return false;
+ }
+ } else {
+ if (!validateSettableTexFormat(functionName, format))
+ return false;
+ if (!validateSize(functionName, xoffset, yoffset))
+ return false;
+ // Before checking if it is in the range, check if overflow happens first.
+ if (xoffset + width < 0 || yoffset + height < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "bad dimensions");
+ return false;
+ }
+ if (xoffset + width > texture->getWidth(target, level) || yoffset + height > texture->getHeight(target, level)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "dimensions out of range");
+ return false;
+ }
+ if (texture->getInternalFormat(target, level) != format || texture->getType(target, level) != type) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "type and format do not match texture");
+ return false;
+ }
+ }
+
+ return true;
+}
+
+void WebGLRenderingContextBase::texImage2D(GC3Denum target, GC3Dint level, GC3Denum internalformat,
+ GC3Dsizei width, GC3Dsizei height, GC3Dint border,
+ GC3Denum format, GC3Denum type, ArrayBufferView* pixels, ExceptionCode& ec)
+{
+ if (isContextLostOrPending() || !validateTexFuncData("texImage2D", level, width, height, internalformat, format, type, pixels, NullAllowed)
+ || !validateTexFunc("texImage2D", TexImage, SourceArrayBufferView, target, level, internalformat, width, height, border, format, type, 0, 0))
+ return;
+ void* data = pixels ? pixels->baseAddress() : 0;
+ Vector<uint8_t> tempData;
+ bool changeUnpackAlignment = false;
+ if (data && (m_unpackFlipY || m_unpackPremultiplyAlpha)) {
+ if (!m_context->extractTextureData(width, height, format, type,
+ m_unpackAlignment,
+ m_unpackFlipY, m_unpackPremultiplyAlpha,
+ data,
+ tempData))
+ return;
+ data = tempData.data();
+ changeUnpackAlignment = true;
+ }
+ if (changeUnpackAlignment)
+ m_context->pixelStorei(GraphicsContext3D::UNPACK_ALIGNMENT, 1);
+ texImage2DBase(target, level, internalformat, width, height, border,
+ format, type, data, ec);
+ if (changeUnpackAlignment)
+ m_context->pixelStorei(GraphicsContext3D::UNPACK_ALIGNMENT, m_unpackAlignment);
+}
+
+void WebGLRenderingContextBase::texImage2D(GC3Denum target, GC3Dint level, GC3Denum internalformat,
+ GC3Denum format, GC3Denum type, ImageData* pixels, ExceptionCode& ec)
+{
+ ec = 0;
+ if (isContextLostOrPending() || !pixels || !validateTexFunc("texImage2D", TexImage, SourceImageData, target, level, internalformat, pixels->width(), pixels->height(), 0, format, type, 0, 0))
+ return;
+ Vector<uint8_t> data;
+ bool needConversion = true;
+ // The data from ImageData is always of format RGBA8.
+ // No conversion is needed if destination format is RGBA and type is USIGNED_BYTE and no Flip or Premultiply operation is required.
+ if (!m_unpackFlipY && !m_unpackPremultiplyAlpha && format == GraphicsContext3D::RGBA && type == GraphicsContext3D::UNSIGNED_BYTE)
+ needConversion = false;
+ else {
+ if (!m_context->extractImageData(pixels, format, type, m_unpackFlipY, m_unpackPremultiplyAlpha, data)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "texImage2D", "bad image data");
+ return;
+ }
+ }
+ if (m_unpackAlignment != 1)
+ m_context->pixelStorei(GraphicsContext3D::UNPACK_ALIGNMENT, 1);
+ texImage2DBase(target, level, internalformat, pixels->width(), pixels->height(), 0, format, type, needConversion ? data.data() : pixels->data()->data(), ec);
+ if (m_unpackAlignment != 1)
+ m_context->pixelStorei(GraphicsContext3D::UNPACK_ALIGNMENT, m_unpackAlignment);
+}
+
+PassRefPtr<Image> WebGLRenderingContextBase::drawImageIntoBuffer(Image* image, int width, int height, int deviceScaleFactor)
+{
+ IntSize size(width, height);
+ size.scale(deviceScaleFactor);
+ ImageBuffer* buf = m_generatedImageCache.imageBuffer(size);
+ if (!buf) {
+ synthesizeGLError(GraphicsContext3D::OUT_OF_MEMORY, "texImage2D", "out of memory");
+ return nullptr;
+ }
+
+ FloatRect srcRect(FloatPoint(), image->size());
+ FloatRect destRect(FloatPoint(), size);
+ buf->context()->drawImage(image, ColorSpaceDeviceRGB, destRect, srcRect);
+ return buf->copyImage(ImageBuffer::fastCopyImageMode());
+}
+
+void WebGLRenderingContextBase::texImage2D(GC3Denum target, GC3Dint level, GC3Denum internalformat,
+ GC3Denum format, GC3Denum type, HTMLImageElement* image, ExceptionCode& ec)
+{
+ ec = 0;
+ if (isContextLostOrPending() || !validateHTMLImageElement("texImage2D", image, ec))
+ return;
+
+ RefPtr<Image> imageForRender = image->cachedImage()->imageForRenderer(image->renderer());
+ if (imageForRender->isSVGImage())
+ imageForRender = drawImageIntoBuffer(imageForRender.get(), image->width(), image->height(), 1);
+
+ if (!imageForRender || !validateTexFunc("texImage2D", TexImage, SourceHTMLImageElement, target, level, internalformat, imageForRender->width(), imageForRender->height(), 0, format, type, 0, 0))
+ return;
+
+ texImage2DImpl(target, level, internalformat, format, type, imageForRender.get(), GraphicsContext3D::HtmlDomImage, m_unpackFlipY, m_unpackPremultiplyAlpha, ec);
+}
+
+void WebGLRenderingContextBase::texImage2D(GC3Denum target, GC3Dint level, GC3Denum internalformat,
+ GC3Denum format, GC3Denum type, HTMLCanvasElement* canvas, ExceptionCode& ec)
+{
+ ec = 0;
+ if (isContextLostOrPending() || !validateHTMLCanvasElement("texImage2D", canvas, ec) || !validateTexFunc("texImage2D", TexImage, SourceHTMLCanvasElement, target, level, internalformat, canvas->width(), canvas->height(), 0, format, type, 0, 0))
+ return;
+
+ WebGLTexture* texture = validateTextureBinding("texImage2D", target, true);
+ // If possible, copy from the canvas element directly to the texture
+ // via the GPU, without a read-back to system memory.
+ //
+ // FIXME: restriction of (RGB || RGBA)/UNSIGNED_BYTE should be lifted when
+ // ImageBuffer::copyToPlatformTexture implementations are fully functional.
+ if (GraphicsContext3D::TEXTURE_2D == target && texture && type == texture->getType(target, level)
+ && (format == GraphicsContext3D::RGB || format == GraphicsContext3D::RGBA) && type == GraphicsContext3D::UNSIGNED_BYTE) {
+ ImageBuffer* buffer = canvas->buffer();
+ if (buffer && buffer->copyToPlatformTexture(*m_context.get(), texture->object(), internalformat, m_unpackPremultiplyAlpha, m_unpackFlipY)) {
+ texture->setLevelInfo(target, level, internalformat, canvas->width(), canvas->height(), type);
+ return;
+ }
+ }
+
+ RefPtr<ImageData> imageData = canvas->getImageData();
+ if (imageData)
+ texImage2D(target, level, internalformat, format, type, imageData.get(), ec);
+ else
+ texImage2DImpl(target, level, internalformat, format, type, canvas->copiedImage(), GraphicsContext3D::HtmlDomCanvas, m_unpackFlipY, m_unpackPremultiplyAlpha, ec);
+}
+
+#if ENABLE(VIDEO)
+PassRefPtr<Image> WebGLRenderingContextBase::videoFrameToImage(HTMLVideoElement* video, BackingStoreCopy backingStoreCopy, ExceptionCode&)
+{
+ IntSize size(video->videoWidth(), video->videoHeight());
+ ImageBuffer* buf = m_generatedImageCache.imageBuffer(size);
+ if (!buf) {
+ synthesizeGLError(GraphicsContext3D::OUT_OF_MEMORY, "texImage2D", "out of memory");
+ return nullptr;
+ }
+ FloatRect destRect(0, 0, size.width(), size.height());
+ // FIXME: Turn this into a GPU-GPU texture copy instead of CPU readback.
+ video->paintCurrentFrameInContext(buf->context(), destRect);
+ return buf->copyImage(backingStoreCopy);
+}
+
+void WebGLRenderingContextBase::texImage2D(GC3Denum target, GC3Dint level, GC3Denum internalformat,
+ GC3Denum format, GC3Denum type, HTMLVideoElement* video, ExceptionCode& ec)
+{
+ ec = 0;
+ if (isContextLostOrPending() || !validateHTMLVideoElement("texImage2D", video, ec)
+ || !validateTexFunc("texImage2D", TexImage, SourceHTMLVideoElement, target, level, internalformat, video->videoWidth(), video->videoHeight(), 0, format, type, 0, 0))
+ return;
+
+ // Go through the fast path doing a GPU-GPU textures copy without a readback to system memory if possible.
+ // Otherwise, it will fall back to the normal SW path.
+ // FIXME: The current restrictions require that format shoud be RGB or RGBA,
+ // type should be UNSIGNED_BYTE and level should be 0. It may be lifted in the future.
+ WebGLTexture* texture = validateTextureBinding("texImage2D", target, true);
+ if (GraphicsContext3D::TEXTURE_2D == target && texture
+ && (format == GraphicsContext3D::RGB || format == GraphicsContext3D::RGBA)
+ && type == GraphicsContext3D::UNSIGNED_BYTE
+ && (texture->getType(target, level) == GraphicsContext3D::UNSIGNED_BYTE || !texture->isValid(target, level))
+ && !level) {
+ if (video->copyVideoTextureToPlatformTexture(m_context.get(), texture->object(), level, type, internalformat, m_unpackPremultiplyAlpha, m_unpackFlipY)) {
+ texture->setLevelInfo(target, level, internalformat, video->videoWidth(), video->videoHeight(), type);
+ return;
+ }
+ }
+
+ // Normal pure SW path.
+ RefPtr<Image> image = videoFrameToImage(video, ImageBuffer::fastCopyImageMode(), ec);
+ if (!image)
+ return;
+ texImage2DImpl(target, level, internalformat, format, type, image.get(), GraphicsContext3D::HtmlDomVideo, m_unpackFlipY, m_unpackPremultiplyAlpha, ec);
+}
+#endif
+
+void WebGLRenderingContextBase::texParameter(GC3Denum target, GC3Denum pname, GC3Dfloat paramf, GC3Dint parami, bool isFloat)
+{
+ if (isContextLostOrPending())
+ return;
+ WebGLTexture* tex = validateTextureBinding("texParameter", target, false);
+ if (!tex)
+ return;
+ switch (pname) {
+ case GraphicsContext3D::TEXTURE_MIN_FILTER:
+ case GraphicsContext3D::TEXTURE_MAG_FILTER:
+ break;
+ case GraphicsContext3D::TEXTURE_WRAP_S:
+ case GraphicsContext3D::TEXTURE_WRAP_T:
+ if ((isFloat && paramf != GraphicsContext3D::CLAMP_TO_EDGE && paramf != GraphicsContext3D::MIRRORED_REPEAT && paramf != GraphicsContext3D::REPEAT)
+ || (!isFloat && parami != GraphicsContext3D::CLAMP_TO_EDGE && parami != GraphicsContext3D::MIRRORED_REPEAT && parami != GraphicsContext3D::REPEAT)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "texParameter", "invalid parameter");
+ return;
+ }
+ break;
+ case Extensions3D::TEXTURE_MAX_ANISOTROPY_EXT: // EXT_texture_filter_anisotropic
+ if (!m_extTextureFilterAnisotropic) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "texParameter", "invalid parameter, EXT_texture_filter_anisotropic not enabled");
+ return;
+ }
+ break;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "texParameter", "invalid parameter name");
+ return;
+ }
+ if (isFloat) {
+ tex->setParameterf(pname, paramf);
+ m_context->texParameterf(target, pname, paramf);
+ } else {
+ tex->setParameteri(pname, parami);
+ m_context->texParameteri(target, pname, parami);
+ }
+}
+
+void WebGLRenderingContextBase::texParameterf(GC3Denum target, GC3Denum pname, GC3Dfloat param)
+{
+ texParameter(target, pname, param, 0, true);
+}
+
+void WebGLRenderingContextBase::texParameteri(GC3Denum target, GC3Denum pname, GC3Dint param)
+{
+ texParameter(target, pname, 0, param, false);
+}
+
+void WebGLRenderingContextBase::uniform1f(const WebGLUniformLocation* location, GC3Dfloat x, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !location)
+ return;
+
+ if (location->program() != m_currentProgram) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "uniform1f", "location not for current program");
+ return;
+ }
+
+ m_context->uniform1f(location->location(), x);
+}
+
+void WebGLRenderingContextBase::uniform1fv(const WebGLUniformLocation* location, Float32Array* v, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform1fv", location, v, 1))
+ return;
+
+ m_context->uniform1fv(location->location(), v->length(), v->data());
+}
+
+void WebGLRenderingContextBase::uniform1fv(const WebGLUniformLocation* location, GC3Dfloat* v, GC3Dsizei size, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform1fv", location, v, size, 1))
+ return;
+
+ m_context->uniform1fv(location->location(), size, v);
+}
+
+void WebGLRenderingContextBase::uniform1i(const WebGLUniformLocation* location, GC3Dint x, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !location)
+ return;
+
+ if (location->program() != m_currentProgram) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "uniform1i", "location not for current program");
+ return;
+ }
+
+ if ((location->type() == GraphicsContext3D::SAMPLER_2D || location->type() == GraphicsContext3D::SAMPLER_CUBE) && x >= (int)m_textureUnits.size()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "uniform1i", "invalid texture unit");
+ return;
+ }
+
+ m_context->uniform1i(location->location(), x);
+}
+
+void WebGLRenderingContextBase::uniform1iv(const WebGLUniformLocation* location, Int32Array* v, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform1iv", location, v, 1))
+ return;
+
+ if (location->type() == GraphicsContext3D::SAMPLER_2D || location->type() == GraphicsContext3D::SAMPLER_CUBE)
+ for (unsigned i = 0; i < v->length(); ++i) {
+ if (v->data()[i] >= static_cast<int>(m_textureUnits.size())) {
+ LOG(WebGL, "Texture unit size=%zu, v[%d]=%d. Location type = %04X.", m_textureUnits.size(), i, v->data()[i], location->type());
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "uniform1iv", "invalid texture unit");
+ return;
+ }
+ }
+
+ m_context->uniform1iv(location->location(), v->length(), v->data());
+}
+
+void WebGLRenderingContextBase::uniform1iv(const WebGLUniformLocation* location, GC3Dint* v, GC3Dsizei size, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform1iv", location, v, size, 1))
+ return;
+
+ if (location->type() == GraphicsContext3D::SAMPLER_2D || location->type() == GraphicsContext3D::SAMPLER_CUBE)
+ for (unsigned i = 0; i < static_cast<unsigned>(size); ++i) {
+ if (((GC3Dint*)v)[i] >= static_cast<int>(m_textureUnits.size())) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "uniform1iv", "invalid texture unit");
+ return;
+ }
+ }
+
+ m_context->uniform1iv(location->location(), size, v);
+}
+
+void WebGLRenderingContextBase::uniform2f(const WebGLUniformLocation* location, GC3Dfloat x, GC3Dfloat y, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !location)
+ return;
+
+ if (location->program() != m_currentProgram) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "uniform2f", "location not for current program");
+ return;
+ }
+
+ m_context->uniform2f(location->location(), x, y);
+}
+
+void WebGLRenderingContextBase::uniform2fv(const WebGLUniformLocation* location, Float32Array* v, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform2fv", location, v, 2))
+ return;
+
+ m_context->uniform2fv(location->location(), v->length() / 2, v->data());
+}
+
+void WebGLRenderingContextBase::uniform2fv(const WebGLUniformLocation* location, GC3Dfloat* v, GC3Dsizei size, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform2fv", location, v, size, 2))
+ return;
+
+ m_context->uniform2fv(location->location(), size / 2, v);
+}
+
+void WebGLRenderingContextBase::uniform2i(const WebGLUniformLocation* location, GC3Dint x, GC3Dint y, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !location)
+ return;
+
+ if (location->program() != m_currentProgram) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "uniform2i", "location not for current program");
+ return;
+ }
+
+ m_context->uniform2i(location->location(), x, y);
+}
+
+void WebGLRenderingContextBase::uniform2iv(const WebGLUniformLocation* location, Int32Array* v, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform2iv", location, v, 2))
+ return;
+
+ m_context->uniform2iv(location->location(), v->length() / 2, v->data());
+}
+
+void WebGLRenderingContextBase::uniform2iv(const WebGLUniformLocation* location, GC3Dint* v, GC3Dsizei size, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform2iv", location, v, size, 2))
+ return;
+
+ m_context->uniform2iv(location->location(), size / 2, v);
+}
+
+void WebGLRenderingContextBase::uniform3f(const WebGLUniformLocation* location, GC3Dfloat x, GC3Dfloat y, GC3Dfloat z, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !location)
+ return;
+
+ if (location->program() != m_currentProgram) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "uniform3f", "location not for current program");
+ return;
+ }
+
+ m_context->uniform3f(location->location(), x, y, z);
+}
+
+void WebGLRenderingContextBase::uniform3fv(const WebGLUniformLocation* location, Float32Array* v, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform3fv", location, v, 3))
+ return;
+
+ m_context->uniform3fv(location->location(), v->length() / 3, v->data());
+}
+
+void WebGLRenderingContextBase::uniform3fv(const WebGLUniformLocation* location, GC3Dfloat* v, GC3Dsizei size, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform3fv", location, v, size, 3))
+ return;
+
+ m_context->uniform3fv(location->location(), size / 3, v);
+}
+
+void WebGLRenderingContextBase::uniform3i(const WebGLUniformLocation* location, GC3Dint x, GC3Dint y, GC3Dint z, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !location)
+ return;
+
+ if (location->program() != m_currentProgram) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "uniform3i", "location not for current program");
+ return;
+ }
+
+ m_context->uniform3i(location->location(), x, y, z);
+}
+
+void WebGLRenderingContextBase::uniform3iv(const WebGLUniformLocation* location, Int32Array* v, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform3iv", location, v, 3))
+ return;
+
+ m_context->uniform3iv(location->location(), v->length() / 3, v->data());
+}
+
+void WebGLRenderingContextBase::uniform3iv(const WebGLUniformLocation* location, GC3Dint* v, GC3Dsizei size, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform3iv", location, v, size, 3))
+ return;
+
+ m_context->uniform3iv(location->location(), size / 3, v);
+}
+
+void WebGLRenderingContextBase::uniform4f(const WebGLUniformLocation* location, GC3Dfloat x, GC3Dfloat y, GC3Dfloat z, GC3Dfloat w, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !location)
+ return;
+
+ if (location->program() != m_currentProgram) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "uniform4f", "location not for current program");
+ return;
+ }
+
+ m_context->uniform4f(location->location(), x, y, z, w);
+}
+
+void WebGLRenderingContextBase::uniform4fv(const WebGLUniformLocation* location, Float32Array* v, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform4fv", location, v, 4))
+ return;
+
+ m_context->uniform4fv(location->location(), v->length() / 4, v->data());
+}
+
+void WebGLRenderingContextBase::uniform4fv(const WebGLUniformLocation* location, GC3Dfloat* v, GC3Dsizei size, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform4fv", location, v, size, 4))
+ return;
+
+ m_context->uniform4fv(location->location(), size / 4, v);
+}
+
+void WebGLRenderingContextBase::uniform4i(const WebGLUniformLocation* location, GC3Dint x, GC3Dint y, GC3Dint z, GC3Dint w, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !location)
+ return;
+
+ if (location->program() != m_currentProgram) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "uniform4i", "location not for current program");
+ return;
+ }
+
+ m_context->uniform4i(location->location(), x, y, z, w);
+}
+
+void WebGLRenderingContextBase::uniform4iv(const WebGLUniformLocation* location, Int32Array* v, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform4iv", location, v, 4))
+ return;
+
+ m_context->uniform4iv(location->location(), v->length() / 4, v->data());
+}
+
+void WebGLRenderingContextBase::uniform4iv(const WebGLUniformLocation* location, GC3Dint* v, GC3Dsizei size, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformParameters("uniform4iv", location, v, size, 4))
+ return;
+
+ m_context->uniform4iv(location->location(), size / 4, v);
+}
+
+void WebGLRenderingContextBase::uniformMatrix2fv(const WebGLUniformLocation* location, GC3Dboolean transpose, Float32Array* v, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformMatrixParameters("uniformMatrix2fv", location, transpose, v, 4))
+ return;
+ m_context->uniformMatrix2fv(location->location(), v->length() / 4, transpose, v->data());
+}
+
+void WebGLRenderingContextBase::uniformMatrix2fv(const WebGLUniformLocation* location, GC3Dboolean transpose, GC3Dfloat* v, GC3Dsizei size, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformMatrixParameters("uniformMatrix2fv", location, transpose, v, size, 4))
+ return;
+ m_context->uniformMatrix2fv(location->location(), size / 4, transpose, v);
+}
+
+void WebGLRenderingContextBase::uniformMatrix3fv(const WebGLUniformLocation* location, GC3Dboolean transpose, Float32Array* v, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformMatrixParameters("uniformMatrix3fv", location, transpose, v, 9))
+ return;
+ m_context->uniformMatrix3fv(location->location(), v->length() / 9, transpose, v->data());
+}
+
+void WebGLRenderingContextBase::uniformMatrix3fv(const WebGLUniformLocation* location, GC3Dboolean transpose, GC3Dfloat* v, GC3Dsizei size, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformMatrixParameters("uniformMatrix3fv", location, transpose, v, size, 9))
+ return;
+ m_context->uniformMatrix3fv(location->location(), size / 9, transpose, v);
+}
+
+void WebGLRenderingContextBase::uniformMatrix4fv(const WebGLUniformLocation* location, GC3Dboolean transpose, Float32Array* v, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformMatrixParameters("uniformMatrix4fv", location, transpose, v, 16))
+ return;
+ m_context->uniformMatrix4fv(location->location(), v->length() / 16, transpose, v->data());
+}
+
+void WebGLRenderingContextBase::uniformMatrix4fv(const WebGLUniformLocation* location, GC3Dboolean transpose, GC3Dfloat* v, GC3Dsizei size, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateUniformMatrixParameters("uniformMatrix4fv", location, transpose, v, size, 16))
+ return;
+ m_context->uniformMatrix4fv(location->location(), size / 16, transpose, v);
+}
+
+void WebGLRenderingContextBase::useProgram(WebGLProgram* program, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ bool deleted;
+ if (!checkObjectToBeBound("useProgram", program, deleted))
+ return;
+ if (deleted)
+ program = 0;
+ if (program && !program->getLinkStatus()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "useProgram", "program not valid");
+ return;
+ }
+ if (m_currentProgram != program) {
+ if (m_currentProgram)
+ m_currentProgram->onDetached(graphicsContext3D());
+ m_currentProgram = program;
+ m_context->useProgram(objectOrZero(program));
+ if (program)
+ program->onAttached();
+ }
+}
+
+void WebGLRenderingContextBase::validateProgram(WebGLProgram* program, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending() || !validateWebGLObject("validateProgram", program))
+ return;
+ m_context->validateProgram(objectOrZero(program));
+}
+
+void WebGLRenderingContextBase::vertexAttrib1f(GC3Duint index, GC3Dfloat v0)
+{
+ vertexAttribfImpl("vertexAttrib1f", index, 1, v0, 0.0f, 0.0f, 1.0f);
+}
+
+void WebGLRenderingContextBase::vertexAttrib1fv(GC3Duint index, Float32Array* v)
+{
+ vertexAttribfvImpl("vertexAttrib1fv", index, v, 1);
+}
+
+void WebGLRenderingContextBase::vertexAttrib1fv(GC3Duint index, GC3Dfloat* v, GC3Dsizei size)
+{
+ vertexAttribfvImpl("vertexAttrib1fv", index, v, size, 1);
+}
+
+void WebGLRenderingContextBase::vertexAttrib2f(GC3Duint index, GC3Dfloat v0, GC3Dfloat v1)
+{
+ vertexAttribfImpl("vertexAttrib2f", index, 2, v0, v1, 0.0f, 1.0f);
+}
+
+void WebGLRenderingContextBase::vertexAttrib2fv(GC3Duint index, Float32Array* v)
+{
+ vertexAttribfvImpl("vertexAttrib2fv", index, v, 2);
+}
+
+void WebGLRenderingContextBase::vertexAttrib2fv(GC3Duint index, GC3Dfloat* v, GC3Dsizei size)
+{
+ vertexAttribfvImpl("vertexAttrib2fv", index, v, size, 2);
+}
+
+void WebGLRenderingContextBase::vertexAttrib3f(GC3Duint index, GC3Dfloat v0, GC3Dfloat v1, GC3Dfloat v2)
+{
+ vertexAttribfImpl("vertexAttrib3f", index, 3, v0, v1, v2, 1.0f);
+}
+
+void WebGLRenderingContextBase::vertexAttrib3fv(GC3Duint index, Float32Array* v)
+{
+ vertexAttribfvImpl("vertexAttrib3fv", index, v, 3);
+}
+
+void WebGLRenderingContextBase::vertexAttrib3fv(GC3Duint index, GC3Dfloat* v, GC3Dsizei size)
+{
+ vertexAttribfvImpl("vertexAttrib3fv", index, v, size, 3);
+}
+
+void WebGLRenderingContextBase::vertexAttrib4f(GC3Duint index, GC3Dfloat v0, GC3Dfloat v1, GC3Dfloat v2, GC3Dfloat v3)
+{
+ vertexAttribfImpl("vertexAttrib4f", index, 4, v0, v1, v2, v3);
+}
+
+void WebGLRenderingContextBase::vertexAttrib4fv(GC3Duint index, Float32Array* v)
+{
+ vertexAttribfvImpl("vertexAttrib4fv", index, v, 4);
+}
+
+void WebGLRenderingContextBase::vertexAttrib4fv(GC3Duint index, GC3Dfloat* v, GC3Dsizei size)
+{
+ vertexAttribfvImpl("vertexAttrib4fv", index, v, size, 4);
+}
+
+void WebGLRenderingContextBase::vertexAttribPointer(GC3Duint index, GC3Dint size, GC3Denum type, GC3Dboolean normalized, GC3Dsizei stride, long long offset, ExceptionCode& ec)
+{
+ UNUSED_PARAM(ec);
+ if (isContextLostOrPending())
+ return;
+ switch (type) {
+ case GraphicsContext3D::BYTE:
+ case GraphicsContext3D::UNSIGNED_BYTE:
+ case GraphicsContext3D::SHORT:
+ case GraphicsContext3D::UNSIGNED_SHORT:
+ case GraphicsContext3D::FLOAT:
+ break;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "vertexAttribPointer", "invalid type");
+ return;
+ }
+ if (index >= m_maxVertexAttribs) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "vertexAttribPointer", "index out of range");
+ return;
+ }
+ if (size < 1 || size > 4 || stride < 0 || stride > 255 || offset < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "vertexAttribPointer", "bad size, stride or offset");
+ return;
+ }
+ if (!m_boundArrayBuffer) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "vertexAttribPointer", "no bound ARRAY_BUFFER");
+ return;
+ }
+ // Determine the number of elements the bound buffer can hold, given the offset, size, type and stride
+ unsigned int typeSize = sizeInBytes(type);
+ if (!typeSize) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "vertexAttribPointer", "invalid type");
+ return;
+ }
+ if ((stride % typeSize) || (static_cast<GC3Dintptr>(offset) % typeSize)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "vertexAttribPointer", "stride or offset not valid for type");
+ return;
+ }
+ GC3Dsizei bytesPerElement = size * typeSize;
+
+ m_boundVertexArrayObject->setVertexAttribState(index, bytesPerElement, size, type, normalized, stride, static_cast<GC3Dintptr>(offset), m_boundArrayBuffer);
+ m_context->vertexAttribPointer(index, size, type, normalized, stride, static_cast<GC3Dintptr>(offset));
+}
+
+void WebGLRenderingContextBase::viewport(GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height)
+{
+ if (isContextLostOrPending())
+ return;
+ if (!validateSize("viewport", width, height))
+ return;
+ m_context->viewport(x, y, width, height);
+}
+
+void WebGLRenderingContextBase::forceLostContext(WebGLRenderingContextBase::LostContextMode mode)
+{
+ if (isContextLostOrPending()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "loseContext", "context already lost");
+ return;
+ }
+
+ m_contextGroup->loseContextGroup(mode);
+}
+
+void WebGLRenderingContextBase::loseContextImpl(WebGLRenderingContextBase::LostContextMode mode)
+{
+ if (isContextLost())
+ return;
+
+ m_contextLost = true;
+ m_contextLostMode = mode;
+
+ if (mode == RealLostContext) {
+ // Inform the embedder that a lost context was received. In response, the embedder might
+ // decide to take action such as asking the user for permission to use WebGL again.
+ if (Frame* frame = canvas()->document().frame())
+ frame->loader().client().didLoseWebGLContext(m_context->getExtensions()->getGraphicsResetStatusARB());
+ }
+
+ detachAndRemoveAllObjects();
+
+ // There is no direct way to clear errors from a GL implementation and
+ // looping until getError() becomes NO_ERROR might cause an infinite loop if
+ // the driver or context implementation had a bug. So, loop a reasonably
+ // large number of times to clear any existing errors.
+ for (int i = 0; i < 100; ++i) {
+ if (m_context->getError() == GraphicsContext3D::NO_ERROR)
+ break;
+ }
+ ConsoleDisplayPreference display = (mode == RealLostContext) ? DisplayInConsole: DontDisplayInConsole;
+ synthesizeGLError(GraphicsContext3D::CONTEXT_LOST_WEBGL, "loseContext", "context lost", display);
+
+ // Don't allow restoration unless the context lost event has both been
+ // dispatched and its default behavior prevented.
+ m_restoreAllowed = false;
+
+ // Always defer the dispatch of the context lost event, to implement
+ // the spec behavior of queueing a task.
+ m_dispatchContextLostEventTimer.startOneShot(0);
+}
+
+void WebGLRenderingContextBase::forceRestoreContext()
+{
+ if (!isContextLostOrPending()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "restoreContext", "context not lost");
+ return;
+ }
+
+ if (!m_restoreAllowed) {
+ if (m_contextLostMode == SyntheticLostContext)
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "restoreContext", "context restoration not allowed");
+ return;
+ }
+
+ if (!m_restoreTimer.isActive())
+ m_restoreTimer.startOneShot(0);
+}
+
+PlatformLayer* WebGLRenderingContextBase::platformLayer() const
+{
+ return (!isContextLost() && !m_isPendingPolicyResolution) ? m_context->platformLayer() : 0;
+}
+
+void WebGLRenderingContextBase::removeSharedObject(WebGLSharedObject* object)
+{
+ if (m_isPendingPolicyResolution)
+ return;
+
+ m_contextGroup->removeObject(object);
+}
+
+void WebGLRenderingContextBase::addSharedObject(WebGLSharedObject* object)
+{
+ if (m_isPendingPolicyResolution)
+ return;
+
+ ASSERT(!isContextLost());
+ m_contextGroup->addObject(object);
+}
+
+void WebGLRenderingContextBase::removeContextObject(WebGLContextObject* object)
+{
+ if (m_isPendingPolicyResolution)
+ return;
+
+ m_contextObjects.remove(object);
+}
+
+void WebGLRenderingContextBase::addContextObject(WebGLContextObject* object)
+{
+ if (m_isPendingPolicyResolution)
+ return;
+
+ ASSERT(!isContextLost());
+ m_contextObjects.add(object);
+}
+
+void WebGLRenderingContextBase::detachAndRemoveAllObjects()
+{
+ if (m_isPendingPolicyResolution)
+ return;
+
+ while (m_contextObjects.size() > 0) {
+ HashSet<WebGLContextObject*>::iterator it = m_contextObjects.begin();
+ (*it)->detachContext();
+ }
+}
+
+bool WebGLRenderingContextBase::hasPendingActivity() const
+{
+ return false;
+}
+
+void WebGLRenderingContextBase::stop()
+{
+ if (!isContextLost() && !m_isPendingPolicyResolution) {
+ forceLostContext(SyntheticLostContext);
+ destroyGraphicsContext3D();
+ }
+}
+
+const char* WebGLRenderingContextBase::activeDOMObjectName() const
+{
+ return "WebGLRenderingContext";
+}
+
+bool WebGLRenderingContextBase::canSuspendForPageCache() const
+{
+ // FIXME: We should try and do better here.
+ return false;
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getBooleanParameter(GC3Denum pname)
+{
+ GC3Dboolean value = 0;
+ m_context->getBooleanv(pname, &value);
+ return WebGLGetInfo(static_cast<bool>(value));
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getBooleanArrayParameter(GC3Denum pname)
+{
+ if (pname != GraphicsContext3D::COLOR_WRITEMASK) {
+ notImplemented();
+ return WebGLGetInfo(0, 0);
+ }
+ GC3Dboolean value[4] = {0};
+ m_context->getBooleanv(pname, value);
+ bool boolValue[4];
+ for (int ii = 0; ii < 4; ++ii)
+ boolValue[ii] = static_cast<bool>(value[ii]);
+ return WebGLGetInfo(boolValue, 4);
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getFloatParameter(GC3Denum pname)
+{
+ GC3Dfloat value = 0;
+ m_context->getFloatv(pname, &value);
+ return WebGLGetInfo(value);
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getIntParameter(GC3Denum pname)
+{
+ GC3Dint value = 0;
+ m_context->getIntegerv(pname, &value);
+ return WebGLGetInfo(value);
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getUnsignedIntParameter(GC3Denum pname)
+{
+ GC3Dint value = 0;
+ m_context->getIntegerv(pname, &value);
+ return WebGLGetInfo(static_cast<unsigned int>(value));
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getInt64Parameter(GC3Denum pname)
+{
+ GC3Dint64 value = 0;
+ m_context->getInteger64v(pname, &value);
+ return WebGLGetInfo(value);
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getWebGLFloatArrayParameter(GC3Denum pname)
+{
+ GC3Dfloat value[4] = {0};
+ m_context->getFloatv(pname, value);
+ unsigned length = 0;
+ switch (pname) {
+ case GraphicsContext3D::ALIASED_POINT_SIZE_RANGE:
+ case GraphicsContext3D::ALIASED_LINE_WIDTH_RANGE:
+ case GraphicsContext3D::DEPTH_RANGE:
+ length = 2;
+ break;
+ case GraphicsContext3D::BLEND_COLOR:
+ case GraphicsContext3D::COLOR_CLEAR_VALUE:
+ length = 4;
+ break;
+ default:
+ notImplemented();
+ }
+ return WebGLGetInfo(Float32Array::create(value, length).release());
+}
+
+WebGLGetInfo WebGLRenderingContextBase::getWebGLIntArrayParameter(GC3Denum pname)
+{
+ GC3Dint value[4] = {0};
+ m_context->getIntegerv(pname, value);
+ unsigned length = 0;
+ switch (pname) {
+ case GraphicsContext3D::MAX_VIEWPORT_DIMS:
+ length = 2;
+ break;
+ case GraphicsContext3D::SCISSOR_BOX:
+ case GraphicsContext3D::VIEWPORT:
+ length = 4;
+ break;
+ default:
+ notImplemented();
+ }
+ return WebGLGetInfo(Int32Array::create(value, length).release());
+}
+
+void WebGLRenderingContextBase::checkTextureCompleteness(const char* functionName, bool prepareToDraw)
+{
+ bool resetActiveUnit = false;
+ WebGLTexture::TextureExtensionFlag extensions = static_cast<WebGLTexture::TextureExtensionFlag>((m_oesTextureFloatLinear ? WebGLTexture::TextureExtensionFloatLinearEnabled : 0) | (m_oesTextureHalfFloatLinear ? WebGLTexture::TextureExtensionHalfFloatLinearEnabled : 0));
+
+ for (unsigned ii = 0; ii < m_textureUnits.size(); ++ii) {
+ if ((m_textureUnits[ii].texture2DBinding && m_textureUnits[ii].texture2DBinding->needToUseBlackTexture(extensions))
+ || (m_textureUnits[ii].textureCubeMapBinding && m_textureUnits[ii].textureCubeMapBinding->needToUseBlackTexture(extensions))) {
+ if (ii != m_activeTextureUnit) {
+ m_context->activeTexture(ii);
+ resetActiveUnit = true;
+ } else if (resetActiveUnit) {
+ m_context->activeTexture(ii);
+ resetActiveUnit = false;
+ }
+ WebGLTexture* tex2D;
+ WebGLTexture* texCubeMap;
+ if (prepareToDraw) {
+ String msg(String("texture bound to texture unit ") + String::number(ii)
+ + " is not renderable. It maybe non-power-of-2 and have incompatible texture filtering or is not 'texture complete',"
+ + " or it is a float/half-float type with linear filtering and without the relevant float/half-float linear extension enabled.");
+ printGLWarningToConsole(functionName, msg.utf8().data());
+ tex2D = m_blackTexture2D.get();
+ texCubeMap = m_blackTextureCubeMap.get();
+ } else {
+ tex2D = m_textureUnits[ii].texture2DBinding.get();
+ texCubeMap = m_textureUnits[ii].textureCubeMapBinding.get();
+ }
+ if (m_textureUnits[ii].texture2DBinding && m_textureUnits[ii].texture2DBinding->needToUseBlackTexture(extensions))
+ m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, objectOrZero(tex2D));
+ if (m_textureUnits[ii].textureCubeMapBinding && m_textureUnits[ii].textureCubeMapBinding->needToUseBlackTexture(extensions))
+ m_context->bindTexture(GraphicsContext3D::TEXTURE_CUBE_MAP, objectOrZero(texCubeMap));
+ }
+ }
+ if (resetActiveUnit)
+ m_context->activeTexture(m_activeTextureUnit);
+}
+
+void WebGLRenderingContextBase::createFallbackBlackTextures1x1()
+{
+ unsigned char black[] = {0, 0, 0, 255};
+ m_blackTexture2D = createTexture();
+ m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_blackTexture2D->object());
+ m_context->texImage2D(GraphicsContext3D::TEXTURE_2D, 0, GraphicsContext3D::RGBA, 1, 1,
+ 0, GraphicsContext3D::RGBA, GraphicsContext3D::UNSIGNED_BYTE, black);
+ m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
+ m_blackTextureCubeMap = createTexture();
+ m_context->bindTexture(GraphicsContext3D::TEXTURE_CUBE_MAP, m_blackTextureCubeMap->object());
+ m_context->texImage2D(GraphicsContext3D::TEXTURE_CUBE_MAP_POSITIVE_X, 0, GraphicsContext3D::RGBA, 1, 1,
+ 0, GraphicsContext3D::RGBA, GraphicsContext3D::UNSIGNED_BYTE, black);
+ m_context->texImage2D(GraphicsContext3D::TEXTURE_CUBE_MAP_NEGATIVE_X, 0, GraphicsContext3D::RGBA, 1, 1,
+ 0, GraphicsContext3D::RGBA, GraphicsContext3D::UNSIGNED_BYTE, black);
+ m_context->texImage2D(GraphicsContext3D::TEXTURE_CUBE_MAP_POSITIVE_Y, 0, GraphicsContext3D::RGBA, 1, 1,
+ 0, GraphicsContext3D::RGBA, GraphicsContext3D::UNSIGNED_BYTE, black);
+ m_context->texImage2D(GraphicsContext3D::TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, GraphicsContext3D::RGBA, 1, 1,
+ 0, GraphicsContext3D::RGBA, GraphicsContext3D::UNSIGNED_BYTE, black);
+ m_context->texImage2D(GraphicsContext3D::TEXTURE_CUBE_MAP_POSITIVE_Z, 0, GraphicsContext3D::RGBA, 1, 1,
+ 0, GraphicsContext3D::RGBA, GraphicsContext3D::UNSIGNED_BYTE, black);
+ m_context->texImage2D(GraphicsContext3D::TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, GraphicsContext3D::RGBA, 1, 1,
+ 0, GraphicsContext3D::RGBA, GraphicsContext3D::UNSIGNED_BYTE, black);
+ m_context->bindTexture(GraphicsContext3D::TEXTURE_CUBE_MAP, 0);
+}
+
+bool WebGLRenderingContextBase::isTexInternalFormatColorBufferCombinationValid(GC3Denum texInternalFormat,
+ GC3Denum colorBufferFormat)
+{
+ unsigned need = GraphicsContext3D::getChannelBitsByFormat(texInternalFormat);
+ unsigned have = GraphicsContext3D::getChannelBitsByFormat(colorBufferFormat);
+ return (need & have) == need;
+}
+
+GC3Denum WebGLRenderingContextBase::getBoundFramebufferColorFormat()
+{
+ if (m_framebufferBinding && m_framebufferBinding->object())
+ return m_framebufferBinding->getColorBufferFormat();
+ if (m_attributes.alpha)
+ return GraphicsContext3D::RGBA;
+ return GraphicsContext3D::RGB;
+}
+
+int WebGLRenderingContextBase::getBoundFramebufferWidth()
+{
+ if (m_framebufferBinding && m_framebufferBinding->object())
+ return m_framebufferBinding->getColorBufferWidth();
+ return m_context->getInternalFramebufferSize().width();
+}
+
+int WebGLRenderingContextBase::getBoundFramebufferHeight()
+{
+ if (m_framebufferBinding && m_framebufferBinding->object())
+ return m_framebufferBinding->getColorBufferHeight();
+ return m_context->getInternalFramebufferSize().height();
+}
+
+WebGLTexture* WebGLRenderingContextBase::validateTextureBinding(const char* functionName, GC3Denum target, bool useSixEnumsForCubeMap)
+{
+ WebGLTexture* texture = nullptr;
+ switch (target) {
+ case GraphicsContext3D::TEXTURE_2D:
+ texture = m_textureUnits[m_activeTextureUnit].texture2DBinding.get();
+ break;
+ case GraphicsContext3D::TEXTURE_CUBE_MAP_POSITIVE_X:
+ case GraphicsContext3D::TEXTURE_CUBE_MAP_NEGATIVE_X:
+ case GraphicsContext3D::TEXTURE_CUBE_MAP_POSITIVE_Y:
+ case GraphicsContext3D::TEXTURE_CUBE_MAP_NEGATIVE_Y:
+ case GraphicsContext3D::TEXTURE_CUBE_MAP_POSITIVE_Z:
+ case GraphicsContext3D::TEXTURE_CUBE_MAP_NEGATIVE_Z:
+ if (!useSixEnumsForCubeMap) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, functionName, "invalid texture target");
+ return nullptr;
+ }
+ texture = m_textureUnits[m_activeTextureUnit].textureCubeMapBinding.get();
+ break;
+ case GraphicsContext3D::TEXTURE_CUBE_MAP:
+ if (useSixEnumsForCubeMap) {
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, functionName, "invalid texture target");
+ return nullptr;
+ }
+ texture = m_textureUnits[m_activeTextureUnit].textureCubeMapBinding.get();
+ break;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, functionName, "invalid texture target");
+ return nullptr;
+ }
+ if (!texture)
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "no texture");
+ return texture;
+}
+
+bool WebGLRenderingContextBase::validateLocationLength(const char* functionName, const String& string)
+{
+ const unsigned maxWebGLLocationLength = 256;
+ if (string.length() > maxWebGLLocationLength) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "location length > 256");
+ return false;
+ }
+ return true;
+}
+
+bool WebGLRenderingContextBase::validateSize(const char* functionName, GC3Dint x, GC3Dint y)
+{
+ if (x < 0 || y < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "size < 0");
+ return false;
+ }
+ return true;
+}
+
+bool WebGLRenderingContextBase::validateString(const char* functionName, const String& string)
+{
+ for (size_t i = 0; i < string.length(); ++i) {
+ if (!validateCharacter(string[i])) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "string not ASCII");
+ return false;
+ }
+ }
+ return true;
+}
+
+bool WebGLRenderingContextBase::validateTexFuncLevel(const char* functionName, GC3Denum target, GC3Dint level)
+{
+ if (level < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "level < 0");
+ return false;
+ }
+ switch (target) {
+ case GraphicsContext3D::TEXTURE_2D:
+ if (level >= m_maxTextureLevel) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "level out of range");
+ return false;
+ }
+ break;
+ case GraphicsContext3D::TEXTURE_CUBE_MAP_POSITIVE_X:
+ case GraphicsContext3D::TEXTURE_CUBE_MAP_NEGATIVE_X:
+ case GraphicsContext3D::TEXTURE_CUBE_MAP_POSITIVE_Y:
+ case GraphicsContext3D::TEXTURE_CUBE_MAP_NEGATIVE_Y:
+ case GraphicsContext3D::TEXTURE_CUBE_MAP_POSITIVE_Z:
+ case GraphicsContext3D::TEXTURE_CUBE_MAP_NEGATIVE_Z:
+ if (level >= m_maxCubeMapTextureLevel) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "level out of range");
+ return false;
+ }
+ break;
+ }
+ // This function only checks if level is legal, so we return true and don't
+ // generate INVALID_ENUM if target is illegal.
+ return true;
+}
+
+bool WebGLRenderingContextBase::validateCompressedTexFormat(GC3Denum format)
+{
+ return m_compressedTextureFormats.contains(format);
+}
+
+bool WebGLRenderingContextBase::validateCompressedTexFuncData(const char* functionName,
+ GC3Dsizei width, GC3Dsizei height,
+ GC3Denum format, ArrayBufferView* pixels)
+{
+ if (!pixels) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "no pixels");
+ return false;
+ }
+ if (width < 0 || height < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "width or height < 0");
+ return false;
+ }
+
+ unsigned int bytesRequired = 0;
+
+ switch (format) {
+ case Extensions3D::COMPRESSED_RGB_S3TC_DXT1_EXT:
+ case Extensions3D::COMPRESSED_RGBA_S3TC_DXT1_EXT:
+ case Extensions3D::COMPRESSED_ATC_RGB_AMD:
+ {
+ const int kBlockSize = 8;
+ const int kBlockWidth = 4;
+ const int kBlockHeight = 4;
+ int numBlocksAcross = (width + kBlockWidth - 1) / kBlockWidth;
+ int numBlocksDown = (height + kBlockHeight - 1) / kBlockHeight;
+ bytesRequired = numBlocksAcross * numBlocksDown * kBlockSize;
+ }
+ break;
+ case Extensions3D::COMPRESSED_RGBA_S3TC_DXT3_EXT:
+ case Extensions3D::COMPRESSED_RGBA_S3TC_DXT5_EXT:
+ case Extensions3D::COMPRESSED_ATC_RGBA_EXPLICIT_ALPHA_AMD:
+ case Extensions3D::COMPRESSED_ATC_RGBA_INTERPOLATED_ALPHA_AMD:
+ {
+ const int kBlockSize = 16;
+ const int kBlockWidth = 4;
+ const int kBlockHeight = 4;
+ int numBlocksAcross = (width + kBlockWidth - 1) / kBlockWidth;
+ int numBlocksDown = (height + kBlockHeight - 1) / kBlockHeight;
+ bytesRequired = numBlocksAcross * numBlocksDown * kBlockSize;
+ }
+ break;
+ case Extensions3D::COMPRESSED_RGB_PVRTC_4BPPV1_IMG:
+ case Extensions3D::COMPRESSED_RGBA_PVRTC_4BPPV1_IMG:
+ {
+ const int kBlockSize = 8;
+ const int kBlockWidth = 8;
+ const int kBlockHeight = 8;
+ bytesRequired = (std::max(width, kBlockWidth) * std::max(height, kBlockHeight) * 4 + 7) / kBlockSize;
+ }
+ break;
+ case Extensions3D::COMPRESSED_RGB_PVRTC_2BPPV1_IMG:
+ case Extensions3D::COMPRESSED_RGBA_PVRTC_2BPPV1_IMG:
+ {
+ const int kBlockSize = 8;
+ const int kBlockWidth = 16;
+ const int kBlockHeight = 8;
+ bytesRequired = (std::max(width, kBlockWidth) * std::max(height, kBlockHeight) * 2 + 7) / kBlockSize;
+ }
+ break;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, functionName, "invalid format");
+ return false;
+ }
+
+ if (pixels->byteLength() != bytesRequired) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "length of ArrayBufferView is not correct for dimensions");
+ return false;
+ }
+
+ return true;
+}
+
+bool WebGLRenderingContextBase::validateCompressedTexDimensions(const char* functionName, GC3Denum target, GC3Dint level, GC3Dsizei width, GC3Dsizei height, GC3Denum format)
+{
+ switch (format) {
+ case Extensions3D::COMPRESSED_RGB_S3TC_DXT1_EXT:
+ case Extensions3D::COMPRESSED_RGBA_S3TC_DXT1_EXT:
+ case Extensions3D::COMPRESSED_RGBA_S3TC_DXT3_EXT:
+ case Extensions3D::COMPRESSED_RGBA_S3TC_DXT5_EXT: {
+ const GC3Dsizei kBlockWidth = 4;
+ const GC3Dsizei kBlockHeight = 4;
+ const GC3Dint maxTextureSize = target ? m_maxTextureSize : m_maxCubeMapTextureSize;
+ const GC3Dsizei maxCompressedDimension = maxTextureSize >> level;
+ bool widthValid = (level && width == 1) || (level && width == 2) || (!(width % kBlockWidth) && width <= maxCompressedDimension);
+ bool heightValid = (level && height == 1) || (level && height == 2) || (!(height % kBlockHeight) && height <= maxCompressedDimension);
+ if (!widthValid || !heightValid) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "width or height invalid for level");
+ return false;
+ }
+ return true;
+ }
+ case Extensions3D::COMPRESSED_RGB_PVRTC_4BPPV1_IMG:
+ case Extensions3D::COMPRESSED_RGB_PVRTC_2BPPV1_IMG:
+ case Extensions3D::COMPRESSED_RGBA_PVRTC_4BPPV1_IMG:
+ case Extensions3D::COMPRESSED_RGBA_PVRTC_2BPPV1_IMG:
+ // Height and width must be powers of 2.
+ if ((width & (width - 1)) || (height & (height - 1))) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "width or height invalid for level");
+ return false;
+ }
+ return true;
+ default:
+ return false;
+ }
+}
+
+bool WebGLRenderingContextBase::validateCompressedTexSubDimensions(const char* functionName, GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset,
+ GC3Dsizei width, GC3Dsizei height, GC3Denum format, WebGLTexture* tex)
+{
+ if (xoffset < 0 || yoffset < 0) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "xoffset or yoffset < 0");
+ return false;
+ }
+
+ switch (format) {
+ case Extensions3D::COMPRESSED_RGB_S3TC_DXT1_EXT:
+ case Extensions3D::COMPRESSED_RGBA_S3TC_DXT1_EXT:
+ case Extensions3D::COMPRESSED_RGBA_S3TC_DXT3_EXT:
+ case Extensions3D::COMPRESSED_RGBA_S3TC_DXT5_EXT: {
+ const int kBlockWidth = 4;
+ const int kBlockHeight = 4;
+ if ((xoffset % kBlockWidth) || (yoffset % kBlockHeight)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "xoffset or yoffset not multiple of 4");
+ return false;
+ }
+ if (width - xoffset > tex->getWidth(target, level)
+ || height - yoffset > tex->getHeight(target, level)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "dimensions out of range");
+ return false;
+ }
+ return validateCompressedTexDimensions(functionName, target, level, width, height, format);
+ }
+ case Extensions3D::COMPRESSED_RGB_PVRTC_4BPPV1_IMG:
+ case Extensions3D::COMPRESSED_RGB_PVRTC_2BPPV1_IMG:
+ case Extensions3D::COMPRESSED_RGBA_PVRTC_4BPPV1_IMG:
+ case Extensions3D::COMPRESSED_RGBA_PVRTC_2BPPV1_IMG: {
+ if (xoffset || yoffset) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "xoffset and yoffset must be zero");
+ return false;
+ }
+ if (width != tex->getWidth(target, level)
+ || height != tex->getHeight(target, level)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "dimensions must match existing level");
+ return false;
+ }
+ return validateCompressedTexDimensions(functionName, target, level, width, height, format);
+ }
+ default:
+ return false;
+ }
+}
+
+bool WebGLRenderingContextBase::validateDrawMode(const char* functionName, GC3Denum mode)
+{
+ switch (mode) {
+ case GraphicsContext3D::POINTS:
+ case GraphicsContext3D::LINE_STRIP:
+ case GraphicsContext3D::LINE_LOOP:
+ case GraphicsContext3D::LINES:
+ case GraphicsContext3D::TRIANGLE_STRIP:
+ case GraphicsContext3D::TRIANGLE_FAN:
+ case GraphicsContext3D::TRIANGLES:
+ return true;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, functionName, "invalid draw mode");
+ return false;
+ }
+}
+
+bool WebGLRenderingContextBase::validateStencilSettings(const char* functionName)
+{
+ if (m_stencilMask != m_stencilMaskBack || m_stencilFuncRef != m_stencilFuncRefBack || m_stencilFuncMask != m_stencilFuncMaskBack) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "front and back stencils settings do not match");
+ return false;
+ }
+ return true;
+}
+
+bool WebGLRenderingContextBase::validateStencilFunc(const char* functionName, GC3Denum func)
+{
+ switch (func) {
+ case GraphicsContext3D::NEVER:
+ case GraphicsContext3D::LESS:
+ case GraphicsContext3D::LEQUAL:
+ case GraphicsContext3D::GREATER:
+ case GraphicsContext3D::GEQUAL:
+ case GraphicsContext3D::EQUAL:
+ case GraphicsContext3D::NOTEQUAL:
+ case GraphicsContext3D::ALWAYS:
+ return true;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, functionName, "invalid function");
+ return false;
+ }
+}
+
+void WebGLRenderingContextBase::printGLErrorToConsole(const String& message)
+{
+ if (!m_numGLErrorsToConsoleAllowed)
+ return;
+
+ --m_numGLErrorsToConsoleAllowed;
+ printWarningToConsole(message);
+
+ if (!m_numGLErrorsToConsoleAllowed)
+ printWarningToConsole("WebGL: too many errors, no more errors will be reported to the console for this context.");
+}
+
+void WebGLRenderingContextBase::printWarningToConsole(const String& message)
+{
+ if (!canvas())
+ return;
+ canvas()->document().addConsoleMessage(MessageSource::Rendering, MessageLevel::Warning, message);
+}
+
+bool WebGLRenderingContextBase::validateBlendFuncFactors(const char* functionName, GC3Denum src, GC3Denum dst)
+{
+ if (((src == GraphicsContext3D::CONSTANT_COLOR || src == GraphicsContext3D::ONE_MINUS_CONSTANT_COLOR)
+ && (dst == GraphicsContext3D::CONSTANT_ALPHA || dst == GraphicsContext3D::ONE_MINUS_CONSTANT_ALPHA))
+ || ((dst == GraphicsContext3D::CONSTANT_COLOR || dst == GraphicsContext3D::ONE_MINUS_CONSTANT_COLOR)
+ && (src == GraphicsContext3D::CONSTANT_ALPHA || src == GraphicsContext3D::ONE_MINUS_CONSTANT_ALPHA))) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "incompatible src and dst");
+ return false;
+ }
+ return true;
+}
+
+bool WebGLRenderingContextBase::validateUniformParameters(const char* functionName, const WebGLUniformLocation* location, Float32Array* v, GC3Dsizei requiredMinSize)
+{
+ if (!v) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "no array");
+ return false;
+ }
+ return validateUniformMatrixParameters(functionName, location, false, v->data(), v->length(), requiredMinSize);
+}
+
+bool WebGLRenderingContextBase::validateUniformParameters(const char* functionName, const WebGLUniformLocation* location, Int32Array* v, GC3Dsizei requiredMinSize)
+{
+ if (!v) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "no array");
+ return false;
+ }
+ return validateUniformMatrixParameters(functionName, location, false, v->data(), v->length(), requiredMinSize);
+}
+
+bool WebGLRenderingContextBase::validateUniformParameters(const char* functionName, const WebGLUniformLocation* location, void* v, GC3Dsizei size, GC3Dsizei requiredMinSize)
+{
+ return validateUniformMatrixParameters(functionName, location, false, v, size, requiredMinSize);
+}
+
+bool WebGLRenderingContextBase::validateUniformMatrixParameters(const char* functionName, const WebGLUniformLocation* location, GC3Dboolean transpose, Float32Array* v, GC3Dsizei requiredMinSize)
+{
+ if (!v) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "no array");
+ return false;
+ }
+ return validateUniformMatrixParameters(functionName, location, transpose, v->data(), v->length(), requiredMinSize);
+}
+
+bool WebGLRenderingContextBase::validateUniformMatrixParameters(const char* functionName, const WebGLUniformLocation* location, GC3Dboolean transpose, void* v, GC3Dsizei size, GC3Dsizei requiredMinSize)
+{
+ if (!location)
+ return false;
+ if (location->program() != m_currentProgram) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "location is not from current program");
+ return false;
+ }
+ if (!v) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "no array");
+ return false;
+ }
+ if (transpose) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "transpose not FALSE");
+ return false;
+ }
+ if (size < requiredMinSize || (size % requiredMinSize)) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "invalid size");
+ return false;
+ }
+ return true;
+}
+
+WebGLBuffer* WebGLRenderingContextBase::validateBufferDataParameters(const char* functionName, GC3Denum target, GC3Denum usage)
+{
+ WebGLBuffer* buffer = 0;
+ switch (target) {
+ case GraphicsContext3D::ELEMENT_ARRAY_BUFFER:
+ buffer = m_boundVertexArrayObject->getElementArrayBuffer().get();
+ break;
+ case GraphicsContext3D::ARRAY_BUFFER:
+ buffer = m_boundArrayBuffer.get();
+ break;
+ default:
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, functionName, "invalid target");
+ return nullptr;
+ }
+ if (!buffer) {
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, functionName, "no buffer");
+ return nullptr;
+ }
+ switch (usage) {
+ case GraphicsContext3D::STREAM_DRAW:
+ case GraphicsContext3D::STATIC_DRAW:
+ case GraphicsContext3D::DYNAMIC_DRAW:
+ return buffer;
+ }
+ synthesizeGLError(GraphicsContext3D::INVALID_ENUM, functionName, "invalid usage");
+ return nullptr;
+}
+
+bool WebGLRenderingContextBase::validateHTMLImageElement(const char* functionName, HTMLImageElement* image, ExceptionCode& ec)
+{
+ if (!image || !image->cachedImage()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "no image");
+ return false;
+ }
+ const URL& url = image->cachedImage()->response().url();
+ if (url.isNull() || url.isEmpty() || !url.isValid()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "invalid image");
+ return false;
+ }
+ if (wouldTaintOrigin(image)) {
+ ec = SECURITY_ERR;
+ return false;
+ }
+ return true;
+}
+
+bool WebGLRenderingContextBase::validateHTMLCanvasElement(const char* functionName, HTMLCanvasElement* canvas, ExceptionCode& ec)
+{
+ if (!canvas || !canvas->buffer()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "no canvas");
+ return false;
+ }
+ if (wouldTaintOrigin(canvas)) {
+ ec = SECURITY_ERR;
+ return false;
+ }
+ return true;
+}
+
+#if ENABLE(VIDEO)
+bool WebGLRenderingContextBase::validateHTMLVideoElement(const char* functionName, HTMLVideoElement* video, ExceptionCode& ec)
+{
+ if (!video || !video->videoWidth() || !video->videoHeight()) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "no video");
+ return false;
+ }
+ if (wouldTaintOrigin(video)) {
+ ec = SECURITY_ERR;
+ return false;
+ }
+ return true;
+}
+#endif
+
+void WebGLRenderingContextBase::vertexAttribfImpl(const char* functionName, GC3Duint index, GC3Dsizei expectedSize, GC3Dfloat v0, GC3Dfloat v1, GC3Dfloat v2, GC3Dfloat v3)
+{
+ if (isContextLostOrPending())
+ return;
+ if (index >= m_maxVertexAttribs) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "index out of range");
+ return;
+ }
+ // In GL, we skip setting vertexAttrib0 values.
+ if (index || isGLES2Compliant()) {
+ switch (expectedSize) {
+ case 1:
+ m_context->vertexAttrib1f(index, v0);
+ break;
+ case 2:
+ m_context->vertexAttrib2f(index, v0, v1);
+ break;
+ case 3:
+ m_context->vertexAttrib3f(index, v0, v1, v2);
+ break;
+ case 4:
+ m_context->vertexAttrib4f(index, v0, v1, v2, v3);
+ break;
+ }
+ }
+ VertexAttribValue& attribValue = m_vertexAttribValue[index];
+ attribValue.value[0] = v0;
+ attribValue.value[1] = v1;
+ attribValue.value[2] = v2;
+ attribValue.value[3] = v3;
+}
+
+void WebGLRenderingContextBase::vertexAttribfvImpl(const char* functionName, GC3Duint index, Float32Array* v, GC3Dsizei expectedSize)
+{
+ if (isContextLostOrPending())
+ return;
+ if (!v) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "no array");
+ return;
+ }
+ vertexAttribfvImpl(functionName, index, v->data(), v->length(), expectedSize);
+}
+
+void WebGLRenderingContextBase::vertexAttribfvImpl(const char* functionName, GC3Duint index, GC3Dfloat* v, GC3Dsizei size, GC3Dsizei expectedSize)
+{
+ if (isContextLostOrPending())
+ return;
+ if (!v) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "no array");
+ return;
+ }
+ if (size < expectedSize) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "invalid size");
+ return;
+ }
+ if (index >= m_maxVertexAttribs) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, functionName, "index out of range");
+ return;
+ }
+ // In GL, we skip setting vertexAttrib0 values.
+ if (index || isGLES2Compliant()) {
+ switch (expectedSize) {
+ case 1:
+ m_context->vertexAttrib1fv(index, v);
+ break;
+ case 2:
+ m_context->vertexAttrib2fv(index, v);
+ break;
+ case 3:
+ m_context->vertexAttrib3fv(index, v);
+ break;
+ case 4:
+ m_context->vertexAttrib4fv(index, v);
+ break;
+ }
+ }
+ VertexAttribValue& attribValue = m_vertexAttribValue[index];
+ attribValue.initValue();
+ for (int ii = 0; ii < expectedSize; ++ii)
+ attribValue.value[ii] = v[ii];
+}
+
+void WebGLRenderingContextBase::initVertexAttrib0()
+{
+ WebGLVertexArrayObjectBase::VertexAttribState& state = m_boundVertexArrayObject->getVertexAttribState(0);
+
+ m_vertexAttrib0Buffer = createBuffer();
+ m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, m_vertexAttrib0Buffer->object());
+ m_context->bufferData(GraphicsContext3D::ARRAY_BUFFER, 0, GraphicsContext3D::DYNAMIC_DRAW);
+ m_context->vertexAttribPointer(0, 4, GraphicsContext3D::FLOAT, false, 0, 0);
+ state.bufferBinding = m_vertexAttrib0Buffer;
+ m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, 0);
+ m_context->enableVertexAttribArray(0);
+ m_vertexAttrib0BufferSize = 0;
+ m_vertexAttrib0BufferValue[0] = 0.0f;
+ m_vertexAttrib0BufferValue[1] = 0.0f;
+ m_vertexAttrib0BufferValue[2] = 0.0f;
+ m_vertexAttrib0BufferValue[3] = 1.0f;
+ m_forceAttrib0BufferRefill = false;
+ m_vertexAttrib0UsedBefore = false;
+}
+
+bool WebGLRenderingContextBase::simulateVertexAttrib0(GC3Dsizei numVertex)
+{
+ const WebGLVertexArrayObjectBase::VertexAttribState& state = m_boundVertexArrayObject->getVertexAttribState(0);
+ const VertexAttribValue& attribValue = m_vertexAttribValue[0];
+ if (!m_currentProgram)
+ return false;
+ bool usingVertexAttrib0 = m_currentProgram->isUsingVertexAttrib0();
+ if (usingVertexAttrib0)
+ m_vertexAttrib0UsedBefore = true;
+ if (state.enabled && usingVertexAttrib0)
+ return false;
+ if (!usingVertexAttrib0 && !m_vertexAttrib0UsedBefore)
+ return false;
+ m_vertexAttrib0UsedBefore = true;
+ m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, m_vertexAttrib0Buffer->object());
+ Checked<GC3Dsizeiptr, RecordOverflow> bufferDataSize = (numVertex + 1) * 4 * sizeof(GC3Dfloat);
+ if (bufferDataSize.hasOverflowed())
+ return false;
+ if (bufferDataSize.unsafeGet() > m_vertexAttrib0BufferSize) {
+ m_context->bufferData(GraphicsContext3D::ARRAY_BUFFER, bufferDataSize.unsafeGet(), 0, GraphicsContext3D::DYNAMIC_DRAW);
+ m_vertexAttrib0BufferSize = bufferDataSize.unsafeGet();
+ m_forceAttrib0BufferRefill = true;
+ }
+ if (usingVertexAttrib0
+ && (m_forceAttrib0BufferRefill
+ || attribValue.value[0] != m_vertexAttrib0BufferValue[0]
+ || attribValue.value[1] != m_vertexAttrib0BufferValue[1]
+ || attribValue.value[2] != m_vertexAttrib0BufferValue[2]
+ || attribValue.value[3] != m_vertexAttrib0BufferValue[3])) {
+ auto bufferData = std::make_unique<GC3Dfloat[]>((numVertex + 1) * 4);
+ for (GC3Dsizei ii = 0; ii < numVertex + 1; ++ii) {
+ bufferData[ii * 4] = attribValue.value[0];
+ bufferData[ii * 4 + 1] = attribValue.value[1];
+ bufferData[ii * 4 + 2] = attribValue.value[2];
+ bufferData[ii * 4 + 3] = attribValue.value[3];
+ }
+ m_vertexAttrib0BufferValue[0] = attribValue.value[0];
+ m_vertexAttrib0BufferValue[1] = attribValue.value[1];
+ m_vertexAttrib0BufferValue[2] = attribValue.value[2];
+ m_vertexAttrib0BufferValue[3] = attribValue.value[3];
+ m_forceAttrib0BufferRefill = false;
+ m_context->bufferSubData(GraphicsContext3D::ARRAY_BUFFER, 0, bufferDataSize.unsafeGet(), bufferData.get());
+ }
+ m_context->vertexAttribPointer(0, 4, GraphicsContext3D::FLOAT, 0, 0, 0);
+ return true;
+}
+
+void WebGLRenderingContextBase::restoreStatesAfterVertexAttrib0Simulation()
+{
+ const WebGLVertexArrayObjectBase::VertexAttribState& state = m_boundVertexArrayObject->getVertexAttribState(0);
+ if (state.bufferBinding != m_vertexAttrib0Buffer) {
+ m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, objectOrZero(state.bufferBinding.get()));
+ m_context->vertexAttribPointer(0, state.size, state.type, state.normalized, state.originalStride, state.offset);
+ }
+ m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, objectOrZero(m_boundArrayBuffer.get()));
+}
+
+void WebGLRenderingContextBase::dispatchContextLostEvent()
+{
+ RefPtr<WebGLContextEvent> event = WebGLContextEvent::create(eventNames().webglcontextlostEvent, false, true, "");
+ canvas()->dispatchEvent(event);
+ m_restoreAllowed = event->defaultPrevented();
+ if (m_contextLostMode == RealLostContext && m_restoreAllowed)
+ m_restoreTimer.startOneShot(0);
+}
+
+void WebGLRenderingContextBase::maybeRestoreContext()
+{
+ ASSERT(m_contextLost);
+ if (!m_contextLost)
+ return;
+
+ // The rendering context is not restored unless the default behavior of the
+ // webglcontextlost event was prevented earlier.
+ //
+ // Because of the way m_restoreTimer is set up for real vs. synthetic lost
+ // context events, we don't have to worry about this test short-circuiting
+ // the retry loop for real context lost events.
+ if (!m_restoreAllowed)
+ return;
+
+ int contextLostReason = m_context->getExtensions()->getGraphicsResetStatusARB();
+
+ switch (contextLostReason) {
+ case GraphicsContext3D::NO_ERROR:
+ // The GraphicsContext3D implementation might not fully
+ // support GL_ARB_robustness semantics yet. Alternatively, the
+ // WEBGL_lose_context extension might have been used to force
+ // a lost context.
+ break;
+ case Extensions3D::GUILTY_CONTEXT_RESET_ARB:
+ // The rendering context is not restored if this context was
+ // guilty of causing the graphics reset.
+ printWarningToConsole("WARNING: WebGL content on the page caused the graphics card to reset; not restoring the context");
+ return;
+ case Extensions3D::INNOCENT_CONTEXT_RESET_ARB:
+ // Always allow the context to be restored.
+ break;
+ case Extensions3D::UNKNOWN_CONTEXT_RESET_ARB:
+ // Warn. Ideally, prompt the user telling them that WebGL
+ // content on the page might have caused the graphics card to
+ // reset and ask them whether they want to continue running
+ // the content. Only if they say "yes" should we start
+ // attempting to restore the context.
+ printWarningToConsole("WARNING: WebGL content on the page might have caused the graphics card to reset");
+ break;
+ }
+
+ Frame* frame = canvas()->document().frame();
+ if (!frame)
+ return;
+
+ if (!frame->loader().client().allowWebGL(frame->settings().webGLEnabled()))
+ return;
+
+ FrameView* view = frame->view();
+ if (!view)
+ return;
+ ScrollView* root = view->root();
+ if (!root)
+ return;
+ HostWindow* hostWindow = root->hostWindow();
+ if (!hostWindow)
+ return;
+
+ RefPtr<GraphicsContext3D> context(GraphicsContext3D::create(m_attributes, hostWindow));
+ if (!context) {
+ if (m_contextLostMode == RealLostContext)
+ m_restoreTimer.startOneShot(secondsBetweenRestoreAttempts);
+ else
+ // This likely shouldn't happen but is the best way to report it to the WebGL app.
+ synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "", "error restoring context");
+ return;
+ }
+
+ m_context = context;
+ m_contextLost = false;
+ setupFlags();
+ initializeNewContext();
+ initializeVertexArrayObjects();
+ canvas()->dispatchEvent(WebGLContextEvent::create(eventNames().webglcontextrestoredEvent, false, true, ""));
+}
+
+String WebGLRenderingContextBase::ensureNotNull(const String& text) const
+{
+ if (text.isNull())
+ return WTF::emptyString();
+ return text;
+}
+
+WebGLRenderingContextBase::LRUImageBufferCache::LRUImageBufferCache(int capacity)
+ : m_buffers(std::make_unique<std::unique_ptr<ImageBuffer>[]>(capacity))
+ , m_capacity(capacity)
+{
+}
+
+ImageBuffer* WebGLRenderingContextBase::LRUImageBufferCache::imageBuffer(const IntSize& size)
+{
+ int i;
+ for (i = 0; i < m_capacity; ++i) {
+ ImageBuffer* buf = m_buffers[i].get();
+ if (!buf)
+ break;
+ if (buf->logicalSize() != size)
+ continue;
+ bubbleToFront(i);
+ return buf;
+ }
+
+ std::unique_ptr<ImageBuffer> temp = ImageBuffer::create(size, 1);
+ if (!temp)
+ return nullptr;
+ i = std::min(m_capacity - 1, i);
+ m_buffers[i] = WTF::move(temp);
+
+ ImageBuffer* buf = m_buffers[i].get();
+ bubbleToFront(i);
+ return buf;
+}
+
+void WebGLRenderingContextBase::LRUImageBufferCache::bubbleToFront(int idx)
+{
+ for (int i = idx; i > 0; --i)
+ m_buffers[i].swap(m_buffers[i-1]);
+}
+
+namespace {
+
+ String GetErrorString(GC3Denum error)
+ {
+ switch (error) {
+ case GraphicsContext3D::INVALID_ENUM:
+ return "INVALID_ENUM";
+ case GraphicsContext3D::INVALID_VALUE:
+ return "INVALID_VALUE";
+ case GraphicsContext3D::INVALID_OPERATION:
+ return "INVALID_OPERATION";
+ case GraphicsContext3D::OUT_OF_MEMORY:
+ return "OUT_OF_MEMORY";
+ case GraphicsContext3D::INVALID_FRAMEBUFFER_OPERATION:
+ return "INVALID_FRAMEBUFFER_OPERATION";
+ case GraphicsContext3D::CONTEXT_LOST_WEBGL:
+ return "CONTEXT_LOST_WEBGL";
+ default:
+ return String::format("WebGL ERROR(%04x)", error);
+ }
+ }
+
+} // namespace anonymous
+
+void WebGLRenderingContextBase::synthesizeGLError(GC3Denum error, const char* functionName, const char* description, ConsoleDisplayPreference display)
+{
+ if (m_synthesizedErrorsToConsole && display == DisplayInConsole) {
+ String str = String("WebGL: ") + GetErrorString(error) + ": " + String(functionName) + ": " + String(description);
+ printGLErrorToConsole(str);
+ }
+ m_context->synthesizeGLError(error);
+}
+
+
+void WebGLRenderingContextBase::printGLWarningToConsole(const char* functionName, const char* description)
+{
+ if (m_synthesizedErrorsToConsole) {
+ String str = String("WebGL: ") + String(functionName) + ": " + String(description);
+ printGLErrorToConsole(str);
+ }
+}
+
+void WebGLRenderingContextBase::applyStencilTest()
+{
+ bool haveStencilBuffer = false;
+
+ if (m_framebufferBinding)
+ haveStencilBuffer = m_framebufferBinding->hasStencilBuffer();
+ else {
+ RefPtr<WebGLContextAttributes> attributes = getContextAttributes();
+ haveStencilBuffer = attributes->stencil();
+ }
+ enableOrDisable(GraphicsContext3D::STENCIL_TEST,
+ m_stencilEnabled && haveStencilBuffer);
+}
+
+void WebGLRenderingContextBase::enableOrDisable(GC3Denum capability, bool enable)
+{
+ if (enable)
+ m_context->enable(capability);
+ else
+ m_context->disable(capability);
+}
+
+IntSize WebGLRenderingContextBase::clampedCanvasSize()
+{
+ return IntSize(clamp(canvas()->width(), 1, m_maxViewportDims[0]),
+ clamp(canvas()->height(), 1, m_maxViewportDims[1]));
+}
+
+GC3Dint WebGLRenderingContextBase::getMaxDrawBuffers()
+{
+ if (!supportsDrawBuffers())
+ return 0;
+ if (!m_maxDrawBuffers)
+ m_context->getIntegerv(Extensions3D::MAX_DRAW_BUFFERS_EXT, &m_maxDrawBuffers);
+ if (!m_maxColorAttachments)
+ m_context->getIntegerv(Extensions3D::MAX_COLOR_ATTACHMENTS_EXT, &m_maxColorAttachments);
+ // WEBGL_draw_buffers requires MAX_COLOR_ATTACHMENTS >= MAX_DRAW_BUFFERS.
+ return std::min(m_maxDrawBuffers, m_maxColorAttachments);
+}
+
+GC3Dint WebGLRenderingContextBase::getMaxColorAttachments()
+{
+ if (!supportsDrawBuffers())
+ return 0;
+ if (!m_maxColorAttachments)
+ m_context->getIntegerv(Extensions3D::MAX_COLOR_ATTACHMENTS_EXT, &m_maxColorAttachments);
+ return m_maxColorAttachments;
+}
+
+void WebGLRenderingContextBase::setBackDrawBuffer(GC3Denum buf)
+{
+ m_backDrawBuffer = buf;
+}
+
+void WebGLRenderingContextBase::restoreCurrentFramebuffer()
+{
+ ExceptionCode ec;
+ bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_framebufferBinding.get(), ec);
+}
+
+void WebGLRenderingContextBase::restoreCurrentTexture2D()
+{
+ ExceptionCode ec;
+ bindTexture(GraphicsContext3D::TEXTURE_2D, m_textureUnits[m_activeTextureUnit].texture2DBinding.get(), ec);
+}
+
+bool WebGLRenderingContextBase::supportsDrawBuffers()
+{
+ if (!m_drawBuffersWebGLRequirementsChecked) {
+ m_drawBuffersWebGLRequirementsChecked = true;
+ m_drawBuffersSupported = WebGLDrawBuffers::supported(this);
+ }
+ return m_drawBuffersSupported;
+}
+
+void WebGLRenderingContextBase::drawArraysInstanced(GC3Denum mode, GC3Dint first, GC3Dsizei count, GC3Dsizei primcount)
+{
+ if (!primcount) {
+ markContextChanged();
+ return;
+ }
+
+ if (!validateDrawArrays("drawArraysInstanced", mode, first, count, primcount))
+ return;
+
+ clearIfComposited();
+
+ bool vertexAttrib0Simulated = false;
+ if (!isGLES2Compliant())
+ vertexAttrib0Simulated = simulateVertexAttrib0(first + count - 1);
+ if (!isGLES2NPOTStrict())
+ checkTextureCompleteness("drawArraysInstanced", true);
+
+ m_context->drawArraysInstanced(mode, first, count, primcount);
+
+ if (!isGLES2Compliant() && vertexAttrib0Simulated)
+ restoreStatesAfterVertexAttrib0Simulation();
+ if (!isGLES2NPOTStrict())
+ checkTextureCompleteness("drawArraysInstanced", false);
+ markContextChanged();
+}
+
+void WebGLRenderingContextBase::drawElementsInstanced(GC3Denum mode, GC3Dsizei count, GC3Denum type, long long offset, GC3Dsizei primcount)
+{
+ if (!primcount) {
+ markContextChanged();
+ return;
+ }
+
+ unsigned numElements = 0;
+ if (!validateDrawElements("drawElementsInstanced", mode, count, type, offset, numElements, primcount))
+ return;
+
+ clearIfComposited();
+
+ bool vertexAttrib0Simulated = false;
+ if (!isGLES2Compliant()) {
+ if (!numElements)
+ validateIndexArrayPrecise(count, type, static_cast<GC3Dintptr>(offset), numElements);
+ vertexAttrib0Simulated = simulateVertexAttrib0(numElements);
+ }
+ if (!isGLES2NPOTStrict())
+ checkTextureCompleteness("drawElementsInstanced", true);
+
+ m_context->drawElementsInstanced(mode, count, type, static_cast<GC3Dintptr>(offset), primcount);
+
+ if (!isGLES2Compliant() && vertexAttrib0Simulated)
+ restoreStatesAfterVertexAttrib0Simulation();
+ if (!isGLES2NPOTStrict())
+ checkTextureCompleteness("drawElementsInstanced", false);
+ markContextChanged();
+}
+
+void WebGLRenderingContextBase::vertexAttribDivisor(GC3Duint index, GC3Duint divisor)
+{
+ if (isContextLostOrPending())
+ return;
+
+ if (index >= m_maxVertexAttribs) {
+ synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "vertexAttribDivisor", "index out of range");
+ return;
+ }
+
+ m_boundVertexArrayObject->setVertexAttribDivisor(index, divisor);
+ m_context->vertexAttribDivisor(index, divisor);
+}
+
+
+} // namespace WebCore
+
+#endif // ENABLE(WEBGL)
</ins></span></pre>
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