In order to properly support the gl_PointCoord built-in variable in fragment shaders, it is necessary for the various GraphicsContext3D implementations running on desktop GL to enable the GL_POINT_SPRITE capability. This is similar to the earlier requirement to enable the GL_VERTEX_PROGRAM_POINT_SIZE capability. Note that testing this in WebKit requires ANGLE issue http://code.google.com/p/angleproject/issues/detail?id=35 to be fixed and the version of ANGLE in WebKit to be updated.
(In reply to comment #0) > In order to properly support the gl_PointCoord built-in variable in fragment shaders, it is necessary for the various GraphicsContext3D implementations running on desktop GL to enable the GL_POINT_SPRITE capability. This is similar to the earlier requirement to enable the GL_VERTEX_PROGRAM_POINT_SIZE capability. > > Note that testing this in WebKit requires ANGLE issue http://code.google.com/p/angleproject/issues/detail?id=35 to be fixed and the version of ANGLE in WebKit to be updated. This was recently fixed in ANGLE and rolled into Chromium, and gl_PointCoord is working now. However, shaders that use gl_PointCoord still fail to compile in non-chromium WebKit / Safari. Relevant: http://code.google.com/p/chromium/issues/detail?id=59763 http://code.google.com/p/angleproject/source/detail?r=448 http://src.chromium.org/viewvc/chrome?view=rev&revision=63084
(In reply to comment #1) > (In reply to comment #0) > > In order to properly support the gl_PointCoord built-in variable in fragment shaders, it is necessary for the various GraphicsContext3D implementations running on desktop GL to enable the GL_POINT_SPRITE capability. This is similar to the earlier requirement to enable the GL_VERTEX_PROGRAM_POINT_SIZE capability. > > > > Note that testing this in WebKit requires ANGLE issue http://code.google.com/p/angleproject/issues/detail?id=35 to be fixed and the version of ANGLE in WebKit to be updated. > > This was recently fixed in ANGLE and rolled into Chromium, and gl_PointCoord is working now. > > However, shaders that use gl_PointCoord still fail to compile in non-chromium WebKit / Safari. > > Relevant: > > http://code.google.com/p/chromium/issues/detail?id=59763 > http://code.google.com/p/angleproject/source/detail?r=448 > http://src.chromium.org/viewvc/chrome?view=rev&revision=63084 That's because they are still using an older version of ANGLE.
Created attachment 71574 [details] patch Mac port still needs to roll ANGLE for gl_pointCoord to work
Comment on attachment 71574 [details] patch OK, but see https://bugs.webkit.org/show_bug.cgi?id=48282 ; this only adds code which will need to be fixed later under that bug. Minimally, add a comment to that bug about this new code.
Comment on attachment 71574 [details] patch Clearing flags on attachment: 71574 Committed r70666: <http://trac.webkit.org/changeset/70666>
All reviewed patches have been landed. Closing bug.
http://trac.webkit.org/changeset/70666 might have broken GTK Linux 32-bit Debug