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shaderlib: Added ACES filmic tone mapping curve.

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This commit is contained in:
Branimir Karadžić 2016-01-06 21:07:59 -08:00
parent 6c25d56551
commit faec80b8f9
1 changed files with 24 additions and 6 deletions
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30
examples/common/shaderlib.sh
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@ -60,11 +60,11 @@ vec3 decodeNormalSphereMap(vec2 _encodedNormal)
return vec3(normalize(_encodedNormal.xy) * sqrt(1.0 - zz*zz), zz);
}
// Reference:
// Octahedron normal vector encoding
// http://kriscg.blogspot.com/2014/04/octahedron-normal-vector-encoding.html
vec2 octahedronWrap(vec2 _val)
{
// Reference:
// Octahedron normal vector encoding
// http://kriscg.blogspot.com/2014/04/octahedron-normal-vector-encoding.html
return (1.0 - abs(_val.yx) )
* mix(vec2_splat(-1.0), vec2_splat(1.0), vec2(greaterThanEqual(_val.xy, vec2_splat(0.0) ) ) );
}
@ -87,11 +87,11 @@ vec3 decodeNormalOctahedron(vec2 _encodedNormal)
return normalize(normal);
}
// Reference:
// RGB/XYZ Matrices
// http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html
vec3 convertRGB2XYZ(vec3 _rgb)
{
// Reference:
// RGB/XYZ Matrices
// http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html
vec3 xyz;
xyz.x = dot(vec3(0.4124564, 0.3575761, 0.1804375), _rgb);
xyz.y = dot(vec3(0.2126729, 0.7151522, 0.0721750), _rgb);
@ -246,6 +246,24 @@ vec4 toFilmic(vec4 _rgba)
return vec4(toFilmic(_rgba.xyz), _rgba.w);
}
vec3 toAcesFilmic(vec3 _rgb)
{
// Reference:
// ACES Filmic Tone Mapping Curve
// https://knarkowicz.wordpress.com/2016/01/06/aces-filmic-tone-mapping-curve/
float aa = 2.51f;
float bb = 0.03f;
float cc = 2.43f;
float dd = 0.59f;
float ee = 0.14f;
return saturate( (_rgb*(aa*_rgb + bb) )/(_rgb*(cc*_rgb + dd) + ee) );
}
vec4 toAcesFilmic(vec4 _rgba)
{
return vec4(toAcesFilmic(_rgba.xyz), _rgba.w);
}
vec3 luma(vec3 _rgb)
{
float yy = dot(vec3(0.2126729, 0.7151522, 0.0721750), _rgb);