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vo_opengl: make :srgb decompand the BT.709 values correctly 

This is the same issue as addressed by 257d9f1, except this time for
the :srgb option as well. (257d9f1 only addressed :icc-profile)

The conditions of the srgb_compand mix() call are also flipped to
prevent an off-by-one error.
This commit is contained in:
nand 2014-02-11 19:20:48 +01:00 committed by wm4
parent 391546c52f
commit 19caba0794
1 changed files with 15 additions and 2 deletions
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17
video/out/gl_video_shaders.glsl
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@ -45,8 +45,14 @@
#if __VERSION__ >= 130
vec3 srgb_compand(vec3 v)
{
return mix(1.055 * pow(v, vec3(1.0/2.4)) - vec3(0.055), v * 12.92,
lessThanEqual(v, vec3(0.0031308)));
return mix(v * 12.92, 1.055 * pow(v, vec3(1.0/2.4)) - vec3(0.055),
lessThanEqual(vec3(0.0031308), v));
}
vec3 bt709_expand(vec3 v)
{
return mix(v / 4.5, pow((v + vec3(0.099))/1.099, vec3(1/0.45)),
lessThanEqual(vec3(0.0812), v));
}
#endif
@ -384,6 +390,13 @@ void main() {
color = texture3D(lut_3d, color).rgb;
#endif
#ifdef USE_SRGB
// Go from "linear" (0.45) to BT.709 to true linear to sRGB
#ifndef USE_3DLUT
// Unless we are using a 3DLUT, in which case USE_LINEAR_CONV_INV
// already triggered earlier.
color = pow(color, vec3(0.45));
#endif
color = bt709_expand(color.rgb);
color.rgb = srgb_compand(color.rgb);
#endif
#ifdef USE_DITHER