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https://github.com/italicsjenga/slang-shaders.git
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56 lines
1.6 KiB
Plaintext
Executable file
56 lines
1.6 KiB
Plaintext
Executable file
#version 450
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layout(push_constant) uniform Push
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{
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vec4 SourceSize;
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vec4 OriginalSize;
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vec4 OutputSize;
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uint FrameCount;
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float LUT_Size;
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} params;
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#pragma parameter LUT_Size "LUT Size" 16.0 1.0 64.0 1.0
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layout(std140, set = 0, binding = 0) uniform UBO
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{
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mat4 MVP;
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} global;
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#pragma stage vertex
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layout(location = 0) in vec4 Position;
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layout(location = 1) in vec2 TexCoord;
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layout(location = 0) out vec2 vTexCoord;
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void main()
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{
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gl_Position = global.MVP * Position;
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vTexCoord = TexCoord * 1.0001;
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}
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#pragma stage fragment
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layout(location = 0) in vec2 vTexCoord;
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layout(location = 0) out vec4 FragColor;
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layout(set = 0, binding = 2) uniform sampler2D Source;
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layout(set = 0, binding = 3) uniform sampler2D SamplerLUT;
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// This shouldn't be necessary but it seems some undefined values can
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// creep in and each GPU vendor handles that differently. This keeps
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// all values within a safe range
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vec4 mixfix(vec4 a, vec4 b, float c)
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{
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return (a.z < 1.0) ? mix(a, b, c) : a;
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}
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void main()
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{
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vec4 imgColor = texture(Source, vTexCoord.xy);
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float red = ( imgColor.r * (params.LUT_Size - 1.0) + 0.4999 ) / (params.LUT_Size * params.LUT_Size);
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float green = ( imgColor.g * (params.LUT_Size - 1.0) + 0.4999 ) / params.LUT_Size;
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float blue1 = (floor( imgColor.b * (params.LUT_Size - 1.0) ) / params.LUT_Size) + red;
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float blue2 = (ceil( imgColor.b * (params.LUT_Size - 1.0) ) / params.LUT_Size) + red;
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float mixer = clamp(max((imgColor.b - blue1) / (blue2 - blue1), 0.0), 0.0, 1.0);
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vec4 color1 = texture( SamplerLUT, vec2( blue1, green ));
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vec4 color2 = texture( SamplerLUT, vec2( blue2, green ));
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FragColor = mixfix(color1, color2, mixer);
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}
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