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b=765150, HTML5 video playback shows purple screen on Motorola/Tegra 2 devices; r=jrmuizel

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This commit is contained in:
Vladimir Vukicevic 2012-07-05 14:34:04 -04:00
parent b6e81abbe8
commit 45877a1b01
2 changed files with 766 additions and 753 deletions
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1490
gfx/layers/opengl/LayerManagerOGLShaders.h
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29
gfx/layers/opengl/LayerManagerOGLShaders.txt
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@ -272,7 +272,15 @@ $FRAGMENT_CALC_MASK<mask>$
}
@end
// Three textures, representing YCbCr planes of a video image
// Three textures, representing YCbCr planes of a video image.
//
// Some older versions of the Tegra 2 android driver have a bug
// where arithmetic ops on a texture read are just ignored. So,
// if the below was |cb = texture2D(...).r - 0.5|, the "- 0.5" was
// just being ignored/skipped. This, of course, lead to crappy
// rendering -- see bug 765150. Doing them separately like below
// makes it all OK. We don't know if this is special to constants,
// special to 0.5, special to addition/subtraction, etc.
@shader sYCbCrTextureLayer<mask:,Mask>FS
$LAYER_FRAGMENT<mask>$
#ifdef GL_ES
@ -284,14 +292,19 @@ uniform sampler2D uCrTexture;
void main()
{
vec4 yuv;
vec4 color;
yuv.r = texture2D(uCrTexture, vTexCoord).r - 0.5;
yuv.g = texture2D(uYTexture, vTexCoord).r - 0.0625;
yuv.b = texture2D(uCbTexture, vTexCoord).r - 0.5;
color.r = yuv.g * 1.164 + yuv.r * 1.596;
color.g = yuv.g * 1.164 - 0.813 * yuv.r - 0.391 * yuv.b;
color.b = yuv.g * 1.164 + yuv.b * 2.018;
float y = texture2D(uYTexture, vTexCoord).r;
float cb = texture2D(uCbTexture, vTexCoord).r;
float cr = texture2D(uCrTexture, vTexCoord).r;
y = (y - 0.0625) * 1.164;
cb = cb - 0.5;
cr = cr - 0.5;
color.r = y + cr * 1.596;
color.g = y - 0.813 * cr - 0.391 * cb;
color.b = y + cb * 2.018;
color.a = 1.0;
$FRAGMENT_CALC_MASK<mask>$
gl_FragColor = color * uLayerOpacity * mask;