[Webkit-unassigned] [Bug 218185] WebGL2 clearBuffer results are lost if drawing buffer is pending a clear in certain cases

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218185

--- Comment #3 from Kimmo Kinnunen <kkinnunen at apple.com> ---
Yeah, scissor enable.

void WebGL2RenderingContext::clearBufferiv(GCGLenum buffer, GCGLint drawbuffer, Int32List&& values, GCGLuint srcOffset)
{
    if (isContextLostOrPending() || !validateClearBuffer("clearBufferiv", buffer, values.length(), srcOffset))
        return;

    m_context->clearBufferiv(buffer, drawbuffer, values.data(), srcOffset);
    updateBuffersToAutoClear(ClearBufferCaller::ClearBufferiv, buffer, drawbuffer);
}



void WebGL2RenderingContext::updateBuffersToAutoClear(ClearBufferCaller caller, GCGLenum buffer, GCGLint drawbuffer)
{
    // This method makes sure that we don't auto-clear any buffers which the
    // user has manually cleared using the new ES 3.0 clearBuffer* APIs.

    // If the user has a framebuffer bound, don't update the auto-clear
    // state of the built-in back buffer.
    if (m_framebufferBinding)
        return;

    // If the scissor test is on, assume that we can't short-circuit
    // these clears.
    if (m_scissorEnabled)
        return;

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