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Added toLinear/GammaAccurate shader functions.

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Branimir Karadžić 2015-02-17 16:26:10 -08:00
parent b8d065da79
commit 8c1518f259
1 changed files with 26 additions and 0 deletions
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26
examples/common/shaderlib.sh
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@ -183,6 +183,19 @@ vec4 toLinear(vec4 _rgba)
return vec4(toLinear(_rgba.xyz), _rgba.w);
}
vec3 toLinearAccurate(vec3 _rgb)
{
vec3 lo = _rgb / 12.92;
vec3 hi = pow( (_rgb + 0.055) / 1.055, vec3_splat(2.4) );
vec3 rgb = mix(hi, lo, vec3(lessThanEqual(_rgb, vec3_splat(0.04045) ) ) );
return rgb;
}
vec4 toLinearAccurate(vec4 _rgba)
{
return vec4(toLinearAccurate(_rgba.xyz), _rgba.w);
}
float toGamma(float _r)
{
return pow(abs(_r), 1.0/2.2);
@ -198,6 +211,19 @@ vec4 toGamma(vec4 _rgba)
return vec4(toGamma(_rgba.xyz), _rgba.w);
}
vec3 toGammaAccurate(vec3 _rgb)
{
vec3 lo = _rgb * 12.92;
vec3 hi = pow(abs(_rgb), vec3_splat(1.0/2.4) ) * 1.055 - 0.055;
vec3 rgb = mix(hi, lo, vec3(lessThanEqual(_rgb, vec3_splat(0.0031308) ) ) );
return rgb;
}
vec4 toGammaAccurate(vec4 _rgba)
{
return vec4(toGammaAccurate(_rgba.xyz), _rgba.w);
}
vec3 toReinhard(vec3 _rgb)
{
return toGamma(_rgb/(_rgb+vec3_splat(1.0) ) );