mirror of
https://github.com/OpenRCT2/OpenRCT2.git
synced 2024-08-28 13:11:32 +02:00
62 lines
1.3 KiB
GLSL
62 lines
1.3 KiB
GLSL
#version 150
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uniform ivec2 uScreenSize;
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uniform ivec4 uClip;
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uniform int uFlags;
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uniform vec4 uColour[2];
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uniform sampler2D uSourceFramebuffer;
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uniform ivec4 uBounds;
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in vec2 fPosition;
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out vec4 oColour;
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float getluma(vec3 colour)
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{
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return (colour.r * 0.2126) +
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(colour.g * 0.7152) +
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(colour.b * 0.0722);
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}
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void main()
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{
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if (fPosition.x < uClip.x || fPosition.x > uClip.z ||
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fPosition.y < uClip.y || fPosition.y > uClip.w)
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{
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discard;
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}
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vec4 targetColour;
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int posSum = int(fPosition.x) + int(fPosition.y);
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if ((posSum % 2) == 0)
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{
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targetColour = uColour[0];
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}
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else
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{
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targetColour = uColour[1];
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}
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if ((uFlags & 1) != 0)
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{
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vec2 textureCoordinates = (fPosition / vec2(uScreenSize)) * vec2(1, -1);
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vec4 sourceColour = texture(uSourceFramebuffer, textureCoordinates);
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float luma = getluma(sourceColour.rgb);
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sourceColour = vec4(vec3(luma), 1);
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if (luma < 0.5)
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{
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oColour = 2.0 * sourceColour * targetColour;
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}
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else
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{
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oColour = 1.0 - 2.0 * (1.0 - sourceColour) * (1.0 - targetColour);
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}
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}
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else
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{
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oColour = targetColour;
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}
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}
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