20 lines
588 B
GLSL
20 lines
588 B
GLSL
// pathfinder/shaders/gles2/direct-curve.fs.glsl
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//
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// Copyright (c) 2017 Mozilla Foundation
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// This shader implements the quadratic Loop-Blinn formulation without writing precise depth.
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// It is therefore unsuitable for ECAA, but it's fast (specifically, preserving early Z) and
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// compatible with OpenGL ES 2.0.
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precision highp float;
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varying vec4 vColor;
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varying vec2 vTexCoord;
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varying float vSign;
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void main() {
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float side = vTexCoord.x * vTexCoord.x - vTexCoord.y;
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float alpha = float(sign(side) == sign(vSign));
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gl_FragColor = vec4(vColor.rgb, vColor.a * alpha);
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}
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