mirror of
https://github.com/curioustorvald/Terrarum.git
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d5c99aad5e
Former-commit-id: 9340873f9cfb15264004c32d6e4b8f8bd6828d94 Former-commit-id: 1916747c109876aa064412e01204c3aeda9bbbc0
37 lines
1.2 KiB
GLSL
37 lines
1.2 KiB
GLSL
varying vec2 texcoord;
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uniform sampler2D renderTexture;
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uniform mat4 Bayer;
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uniform int pixelSize;
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void main(void) {
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// create texture coordinates based on pixelSize //
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// vec2 discrete = (gl_FragCoord.xy + 0.001) / texcoord / pixelSize; //
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vec2 pixelSizeVec = vec2(float(pixelSize), float(pixelSize));
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vec2 discrete = (gl_FragCoord.xy + 0.001) / texcoord / pixelSizeVec;
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discrete = floor(discrete * texcoord) / discrete;
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vec3 color = texture2D(renderTexture, discrete).rgb;
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// increase contrast (Bayer matrix operation reduces it) //
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float contrast = 1.65;
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color = mix(vec3(0.5), color, contrast);
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// add Bayer matrix entry to current pixel //
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// vec2 entry = mod(gl_FragCoord.xy / pixelSizeVec, vec2(4, 4));
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// color.r = color.r + Bayer[int(entry.x)][int(entry.y)] / 17.0 - 0.5;
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// color.g = color.g + Bayer[int(entry.x)][int(entry.y)] / 17.0 - 0.5;
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// color.b = color.b + Bayer[int(entry.x)][int(entry.y)] / 17.0 - 0.5;
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// find nearest 8-bit color //
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color.r = floor(8.0 * color.r + 0.5) / 8.0;
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color.g = floor(8.0 * color.g + 0.5) / 8.0;
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color.b = floor(4.0 * color.b + 0.5) / 4.0;
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gl_FragColor = vec4(color, 1.0);
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} |