mirror of
https://github.com/scratchfoundation/bgfx.git
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49 lines
1.4 KiB
Text
49 lines
1.4 KiB
Text
#version 300 es
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#define gl_FragColor _glesFragData[0]
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#define gl_FragData _glesFragData
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layout(location = 0) out mediump vec4 _glesFragData[4];
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struct v2f {
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highp vec4 pos;
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highp vec2 uv;
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};
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uniform sampler2D _MainTex;
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uniform sampler2D _Curve;
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uniform highp float _RangeScale;
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highp vec3 FromCIE( in highp vec3 Yxy ) {
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highp vec3 XYZ;
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XYZ.x = ((Yxy.x * Yxy.y) / Yxy.z);
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XYZ.y = Yxy.x;
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XYZ.z = ((Yxy.x * ((1.0 - Yxy.y) - Yxy.z)) / Yxy.z);
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highp mat3 XYZ2RGB = mat3(2.5651, -1.0217, 0.0753, -1.1665, 1.9777, -0.2543, -0.3986, 0.0439, 1.1892);
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return (XYZ2RGB * XYZ);
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}
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highp vec3 ToCIE( in highp vec3 FullScreenImage ) {
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highp mat3 RGB2XYZ = mat3(0.514136, 0.265068, 0.0241188, 0.323879, 0.670234, 0.122818, 0.160364, 0.0640916, 0.844427);
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highp vec3 XYZ = (RGB2XYZ * FullScreenImage.xyz);
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highp vec3 Yxy;
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Yxy.x = XYZ.y;
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highp float temp = dot( vec3( 1.0, 1.0, 1.0), XYZ.xyz);
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Yxy.yz = (XYZ.xy / temp);
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return Yxy;
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}
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highp vec4 fragCurve( in v2f i ) {
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highp vec4 color = texture( _MainTex, i.uv);
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highp vec3 cie = ToCIE( color.xyz);
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highp float newLum = texture( _Curve, vec2( (cie.x * _RangeScale), 0.5)).x;
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cie.x = newLum;
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color.xyz = FromCIE( cie);
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return color;
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}
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in highp vec2 xlv_TEXCOORD0;
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void main() {
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highp vec4 xl_retval;
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v2f xlt_i;
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xlt_i.pos = vec4(0.0);
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xlt_i.uv = vec2(xlv_TEXCOORD0);
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xl_retval = fragCurve(xlt_i);
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gl_FragData[0] = vec4(xl_retval);
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}
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