[Webkit-unassigned] [Bug 231468] New: Query EGL_BIND_TO_TEXTURE_TARGET_ANGLE to determine 2D/rectangular texture usage

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Oct 8 18:21:12 PDT 2021


            Bug ID: 231468
           Summary: Query EGL_BIND_TO_TEXTURE_TARGET_ANGLE to determine
                    2D/rectangular texture usage
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kbr at google.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

WebKit should query EGL_BIND_TO_TEXTURE_TARGET_ANGLE via eglGetConfigAttrib in order to determine whether to bind its IOSurfaces to 2D or rectangular textures, instead of hardcoding platform knowledge in GraphicsContextGLOpenGL::drawingBufferTextureTarget, GraphicsContextGLOpenGL::drawingBufferTextureTargetQuery, createPbufferAndAttachIOSurface, and other places.

This will allow ANGLE's Metal backend to drop support for binding IOSurfaces to rectangular textures. OpenGL on macOS only supported the rectangular texture path, but Metal allows IOSurfaces to be bound to ordinary 2D textures.

The support for rectangular textures that was added to ANGLE's Metal backend in WebKit's fork was incomplete, and broke a lot of unit and end-to-end tests. It's been removed upstream in ANGLE. Rolling upstream ANGLE back into WebKit is predicated on removing usage of rectangular textures with the Metal backend.

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