mirror of https://github.com/bsnes-emu/bsnes.git
32 lines
673 B
GLSL
32 lines
673 B
GLSL
// Gamma Adjustment Shader
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// Written by Themaister - based on byuu's bsnes gamma ramp code
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#version 150
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uniform sampler2D source[];
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in Vertex {
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vec2 texCoord;
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};
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out vec4 fragColor;
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const float saturation = 1.0;
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const float gamma = 1.0;
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const float luminance = 1.2;
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vec3 grayscale(vec3 col)
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{
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// Non-conventional way to do grayscale,
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// but bSNES uses this as grayscale value.
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return vec3(dot(col, vec3(0.3333)));
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}
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void main() {
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vec3 res = texture(source[0], texCoord).xyz;
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res = mix(grayscale(res), res, saturation); // Apply saturation
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res = pow(res, vec3(gamma)); // Apply gamma
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fragColor = vec4(clamp(res * luminance, 0.0, 1.0), 1.0);
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}
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