126 lines
2.4 KiB
GLSL
126 lines
2.4 KiB
GLSL
#version {{version}}
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#extension GL_GOOGLE_include_directive : enable
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precision highp float;
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uniform sampler2D uSource;
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uniform vec2 uSourceSize;
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uniform vec4 uFGColor;
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uniform vec4 uBGColor;
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uniform int uGammaCorrectionEnabled;
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in vec2 vTexCoord;
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out vec4 oFragColor;
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uniform sampler2D uGammaLUT;
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float gammaCorrectChannel(float bgColor, float fgColor){
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return texture(uGammaLUT, vec2(fgColor, 1.0 - bgColor)). r;
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}
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vec3 gammaCorrect(vec3 bgColor, vec3 fgColor){
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return vec3(gammaCorrectChannel(bgColor . r, fgColor . r),
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gammaCorrectChannel(bgColor . g, fgColor . g),
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gammaCorrectChannel(bgColor . b, fgColor . b));
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}
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uniform vec4 uKernel;
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float sample1Tap(float offset);
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void sample9Tap(out vec4 outAlphaLeft,
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out float outAlphaCenter,
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out vec4 outAlphaRight,
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float onePixel){
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outAlphaLeft = vec4(uKernel . x > 0.0 ? sample1Tap(- 4.0 * onePixel): 0.0,
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sample1Tap(- 3.0 * onePixel),
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sample1Tap(- 2.0 * onePixel),
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sample1Tap(- 1.0 * onePixel));
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outAlphaCenter = sample1Tap(0.0);
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outAlphaRight = vec4(sample1Tap(1.0 * onePixel),
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sample1Tap(2.0 * onePixel),
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sample1Tap(3.0 * onePixel),
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uKernel . x > 0.0 ? sample1Tap(4.0 * onePixel): 0.0);
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}
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float convolve7Tap(vec4 alpha0, vec3 alpha1){
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return dot(alpha0, uKernel)+ dot(alpha1, uKernel . zyx);
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}
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float sample1Tap(float offset){
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return texture(uSource, vec2(vTexCoord . x + offset, vTexCoord . y)). r;
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}
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void main(){
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vec3 alpha;
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if(uKernel . w == 0.0){
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alpha = texture(uSource, vTexCoord). rrr;
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} else {
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vec4 alphaLeft, alphaRight;
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float alphaCenter;
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sample9Tap(alphaLeft, alphaCenter, alphaRight, 1.0 / uSourceSize . x);
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float r = convolve7Tap(alphaLeft, vec3(alphaCenter, alphaRight . xy));
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float g = convolve7Tap(vec4(alphaLeft . yzw, alphaCenter), alphaRight . xyz);
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float b = convolve7Tap(vec4(alphaLeft . zw, alphaCenter, alphaRight . x), alphaRight . yzw);
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alpha = vec3(r, g, b);
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}
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if(uGammaCorrectionEnabled != 0)
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alpha = gammaCorrect(uBGColor . rgb, alpha);
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oFragColor = vec4(mix(uBGColor . rgb, uFGColor . rgb, alpha), 1.0);
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}
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