65 lines
1.3 KiB
GLSL
65 lines
1.3 KiB
GLSL
#version {{version}}
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// Automatically generated from files in pathfinder/shaders/. Do not edit!
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#version 450
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precision highp float;
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precision highp sampler2D;
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uniform uFramebufferSize {
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vec2 framebufferSize;
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};
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uniform vec2 uTileSize;
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in uvec2 aTessCoord;
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in uint aFromPx;
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in uint aToPx;
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in vec2 aFromSubpx;
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in vec2 aToSubpx;
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in uint aTileIndex;
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out vec2 vFrom;
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out vec2 vTo;
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vec2 computeTileOffset(uint tileIndex, float stencilTextureWidth){
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uint tilesPerRow = uint(stencilTextureWidth / uTileSize . x);
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uvec2 tileOffset = uvec2(tileIndex % tilesPerRow, tileIndex / tilesPerRow);
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return vec2(tileOffset)* uTileSize;
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}
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void main(){
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vec2 tileOrigin = computeTileOffset(aTileIndex, framebufferSize . x);
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vec2 from = vec2(aFromPx & 15u, aFromPx >> 4u)+ aFromSubpx;
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vec2 to = vec2(aToPx & 15u, aToPx >> 4u)+ aToSubpx;
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vec2 position;
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if(aTessCoord . x == 0u)
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position . x = floor(min(from . x, to . x));
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else
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position . x = ceil(max(from . x, to . x));
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if(aTessCoord . y == 0u)
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position . y = floor(min(from . y, to . y));
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else
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position . y = uTileSize . y;
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vFrom = from - position;
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vTo = to - position;
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vec2 globalPosition =(tileOrigin + position)/ framebufferSize * 2.0 - 1.0;
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gl_Position = vec4(globalPosition, 0.0, 1.0);
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}
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