87 lines
2.1 KiB
GLSL
87 lines
2.1 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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uniform vec2 uFramebufferSize;
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uniform vec2 uTileSize;
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in uvec2 aTessCoord;
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in uvec4 aLineSegment;
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in int 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, vec2 tileSize){
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uint tilesPerRow = uint(stencilTextureWidth / tileSize . x);
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uvec2 tileOffset = uvec2(tileIndex % tilesPerRow, tileIndex / tilesPerRow);
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return vec2(tileOffset)* tileSize * vec2(1.0, 0.25);
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}
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vec4 computeVertexPosition(uint tileIndex,
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uvec2 tessCoord,
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uvec4 packedLineSegment,
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vec2 tileSize,
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vec2 framebufferSize,
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out vec2 outFrom,
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out vec2 outTo){
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vec2 tileOrigin = computeTileOffset(uint(tileIndex), framebufferSize . x, tileSize);
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vec4 lineSegment = vec4(packedLineSegment)/ 256.0;
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vec2 from = lineSegment . xy, to = lineSegment . zw;
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vec2 position;
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if(tessCoord . 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(tessCoord . 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 = tileSize . y;
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position . y = floor(position . y * 0.25);
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vec2 offset = vec2(0.0, 1.5)- position * vec2(1.0, 4.0);
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outFrom = from + offset;
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outTo = to + offset;
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vec2 globalPosition =(tileOrigin + position)/ framebufferSize * 2.0 - 1.0;
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return vec4(globalPosition, 0.0, 1.0);
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}
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void main(){
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gl_Position = computeVertexPosition(uint(aTileIndex),
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aTessCoord,
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aLineSegment,
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uTileSize,
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uFramebufferSize,
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vFrom,
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vTo);
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}
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