[Webkit-unassigned] [Bug 47283] Use RGBA instead of Luminance textures for YUV2RGB conversion

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=47283





--- Comment #2 from Kenneth Russell <kbr at google.com>  2010-10-06 11:42:16 PST ---
(From update of attachment 69965)
View in context: https://bugs.webkit.org/attachment.cgi?id=69965&action=review

> WebCore/platform/graphics/chromium/VideoLayerChromium.cpp:113
> +        "  vec4 attrib_y = attrib_matrix[y_index];            \n"

FYI, this indexing operation is not guaranteed to work on OpenGL ES 2.0 hardware. If you look at http://www.khronos.org/registry/gles/specs/2.0/GLSL_ES_Specification_1.0.17.pdf , Appendix A, Section 5, you will see that the only requirement is to support indexing expressions involving constants and loop indices. Is it possible to rephrase this logic (tersely) to work within this restriction?

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