68 lines
2.0 KiB
Plaintext
68 lines
2.0 KiB
Plaintext
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#version 430
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// pathfinder/shaders/fill.cs.glsl
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//
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// Copyright © 2020 The Pathfinder Project Developers.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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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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#include "fill.inc.glsl"
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layout(local_size_x = 16, local_size_y = 16) 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);
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uint tileIndexOffset = gl_WorkGroupID.z;
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uint tileIndex = tileIndexOffset + uint(uFirstTileIndex);
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ivec2 tileOrigin = ivec2(tileIndex & 0xff, (tileIndex >> 8u) & 0xff) * 16;
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ivec2 destCoord = tileOrigin + tileSubCoord;
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int fillIndex = iFillTileMap[tileIndex];
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if (fillIndex < 0)
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return;
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float coverage = 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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from -= vec2(tileSubCoord) + vec2(0.5);
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to -= vec2(tileSubCoord) + vec2(0.5);
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coverage += computeCoverage(from, to, uAreaLUT);
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fillIndex = iNextFills[fillIndex];
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} while (fillIndex >= 0);
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imageStore(uDest, destCoord, vec4(coverage));
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}
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