mirror of
https://github.com/italicsjenga/slang-shaders.git
synced 2024-10-18 07:41:31 +11:00
77 lines
3.5 KiB
Plaintext
77 lines
3.5 KiB
Plaintext
#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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} params;
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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;
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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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void main()
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{
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vec3 OriginPass = texture(Source, vTexCoord).xyz;
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//Get blended textures by offsetting between 4 pixels.
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vec3 SquarePass1 = texture(Source, (vTexCoord * params.SourceSize.xy + vec2( 0.5, 0.5)) * params.SourceSize.zw).xyz;
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vec3 SquarePass2 = texture(Source, (vTexCoord * params.SourceSize.xy + vec2(-0.5,-0.5)) * params.SourceSize.zw).xyz;
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vec3 SquarePass3 = texture(Source, (vTexCoord * params.SourceSize.xy + vec2(-0.5, 0.5)) * params.SourceSize.zw).xyz;
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vec3 SquarePass4 = texture(Source, (vTexCoord * params.SourceSize.xy + vec2( 0.5,-0.5)) * params.SourceSize.zw).xyz;
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//Which SquarePass is closest to the OriginPass?
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vec3 SquarePass1Diff = abs(SquarePass1 - OriginPass);
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vec3 SquarePass2Diff = abs(SquarePass2 - OriginPass);
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vec3 SquarePass3Diff = abs(SquarePass3 - OriginPass);
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vec3 SquarePass4Diff = abs(SquarePass4 - OriginPass);
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float SquarePass1DiffAvg = (SquarePass1Diff.x + SquarePass1Diff.y + SquarePass1Diff.z) / 3.0;
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float SquarePass2DiffAvg = (SquarePass2Diff.x + SquarePass2Diff.y + SquarePass2Diff.z) / 3.0;
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float SquarePass3DiffAvg = (SquarePass3Diff.x + SquarePass3Diff.y + SquarePass3Diff.z) / 3.0;
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float SquarePass4DiffAvg = (SquarePass4Diff.x + SquarePass4Diff.y + SquarePass4Diff.z) / 3.0;
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float SquarePassDiffAvgMin = min(SquarePass1DiffAvg,min(SquarePass2DiffAvg,min(SquarePass3DiffAvg,SquarePass4DiffAvg)));
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vec3 SquarePass =
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float(SquarePassDiffAvgMin == SquarePass1DiffAvg) * float(SquarePass1DiffAvg != SquarePass2DiffAvg) * float(SquarePass1DiffAvg != SquarePass3DiffAvg) * float(SquarePass1DiffAvg != SquarePass4DiffAvg) * SquarePass1 +
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float(SquarePassDiffAvgMin == SquarePass2DiffAvg) * float(SquarePass2DiffAvg != SquarePass3DiffAvg) * float(SquarePass2DiffAvg != SquarePass4DiffAvg) * SquarePass2 +
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float(SquarePassDiffAvgMin == SquarePass3DiffAvg) * float(SquarePass3DiffAvg != SquarePass4DiffAvg) * SquarePass3 +
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float(SquarePassDiffAvgMin == SquarePass4DiffAvg) * SquarePass4;
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//How different is the blended texture from the original texture?
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//The difference between the least different and most different SquarePasses returns edges.
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vec3 SquareCompareMin = min(SquarePass1Diff,min(SquarePass2Diff,min(SquarePass3Diff,SquarePass4Diff)));
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vec3 SquareCompareMax = max(SquarePass1Diff,max(SquarePass2Diff,max(SquarePass3Diff,SquarePass4Diff)));
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vec3 SquareCompareBoth = abs(SquareCompareMin - SquareCompareMax);
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float SquareCompare = max(SquareCompareBoth.x,max(SquareCompareBoth.y,SquareCompareBoth.z));
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//Turn a range of the comparison result into a mask. 2.5 just happens to work well, it's not set in stone or anything.
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float SquareMask = 1.0-pow(1.0-min(max(SquareCompare*2.5,0.0),1.0),2.0);
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//Blend it all together
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vec3 Result = mix(SquarePass,OriginPass,SquareMask);
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//Result = vec3(SquareMask);
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FragColor = vec4(Result,1.0);
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} |