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Fixed palette tonemap mode for OpenGL 2.x

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alexey.lysiuk 2016-08-24 11:44:33 +03:00 committed by GitHub
parent 52b51e79b9
commit 2f893af857
1 changed files with 8 additions and 5 deletions
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13
wadsrc/static/shaders/glsl/tonemap.fp
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@ -70,14 +70,17 @@ uniform sampler2D PaletteLUT;
vec3 Tonemap(vec3 color)
{
ivec3 c = ivec3(clamp(color.rgb, vec3(0.0), vec3(1.0)) * 255.0 + 0.5);
#if __VERSION__ < 130
int index = (c.r / 4 * 64 + c.g / 4) * 64 + c.b / 4;
float tx = mod(index, 512) / 512.0;
float ty = float(index / 512) / 512.0;
return texture2D(PaletteLUT, vec2(tx, ty)).rgb;
#else
int index = ((c.r >> 2) * 64 + (c.g >> 2)) * 64 + (c.b >> 2);
int tx = index % 512;
int ty = index / 512;
#if __VERSION__ < 130
return texture2D(PaletteLUT, vec2(float(tx) / 512.0, float(ty) / 512.0))).rgb;
#else
return texelFetch(PaletteLUT, ivec2(tx, ty), 0).rgb;
#endif
return texelFetch(PaletteLUT, ivec2(tx, ty), 0).rgb;
#endif
}
#else