98 lines
2.2 KiB
GLSL
98 lines
2.2 KiB
GLSL
#version {{version}}
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// Automatically generated from files in pathfinder/shaders/. Do not edit!
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#extension GL_GOOGLE_include_directive : enable
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precision highp float;
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precision highp sampler2D;
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vec4 computeCoverage(vec2 from, vec2 to, sampler2D areaLUT){
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vec2 left = from . x < to . x ? from : to, right = from . x < to . x ? to : from;
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vec2 window = clamp(vec2(from . x, to . x), - 0.5, 0.5);
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float offset = mix(window . x, window . y, 0.5)- left . x;
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float t = offset /(right . x - left . x);
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float y = mix(left . y, right . y, t);
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float d =(right . y - left . y)/(right . x - left . x);
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float dX = window . x - window . y;
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return texture(areaLUT, vec2(y + 8.0, abs(d * dX))/ 16.0)* dX;
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}
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layout(local_size_x = 16, local_size_y = 4)in;
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uniform writeonly image2D uDest;
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uniform sampler2D uAreaLUT;
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uniform int uFirstTileIndex;
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layout(std430, binding = 0)buffer bFills {
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restrict readonly uvec2 iFills[];
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};
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layout(std430, binding = 1)buffer bNextFills {
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restrict readonly int iNextFills[];
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};
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layout(std430, binding = 2)buffer bFillTileMap {
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restrict readonly int iFillTileMap[];
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};
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void main(){
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ivec2 tileSubCoord = ivec2(gl_LocalInvocationID . xy)* ivec2(1, 4);
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uint tileIndexOffset = gl_WorkGroupID . z;
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uint tileIndex = tileIndexOffset + uint(uFirstTileIndex);
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int fillIndex = iFillTileMap[tileIndex];
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if(fillIndex < 0)
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return;
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vec4 coverages = vec4(0.0);
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do {
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uvec2 fill = iFills[fillIndex];
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vec2 from = vec2(fill . y & 0xf,(fill . y >> 4u)& 0xf)+
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vec2(fill . x & 0xff,(fill . x >> 8u)& 0xff)/ 256.0;
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vec2 to = vec2((fill . y >> 8u)& 0xf,(fill . y >> 12u)& 0xf)+
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vec2((fill . x >> 16u)& 0xff,(fill . x >> 24u)& 0xff)/ 256.0;
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coverages += computeCoverage(from -(vec2(tileSubCoord)+ vec2(0.5)),
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to -(vec2(tileSubCoord)+ vec2(0.5)),
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uAreaLUT);
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fillIndex = iNextFills[fillIndex];
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} while(fillIndex >= 0);
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ivec2 tileOrigin = ivec2(tileIndex & 0xff,(tileIndex >> 8u)& 0xff)* ivec2(16, 4);
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ivec2 destCoord = tileOrigin + ivec2(gl_LocalInvocationID . xy);
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imageStore(uDest, destCoord, coverages);
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}
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