33 lines
1.1 KiB
GLSL
33 lines
1.1 KiB
GLSL
// pathfinder/shaders/gles2/xcaa-mono-subpixel-resolve.vs.glsl
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//
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// Copyright (c) 2017 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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//! Performs subpixel antialiasing for LCD screens by converting a
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//! 3x-oversampled single-channel color buffer to an RGB framebuffer, applying
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//! the FreeType color defringing filter as necessary.
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precision highp float;
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/// A dilation (scale and transform) to be applied to the quad.
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uniform vec4 uTransformST;
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/// A fixed pair of factors to be applied to the texture coordinates.
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uniform vec2 uTexScale;
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/// The abstract quad position: (0.0, 0.0) to (1.0, 1.0).
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attribute vec2 aPosition;
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/// The texture coordinates: (0.0, 0.0) to (1.0, 1.0).
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attribute vec2 aTexCoord;
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varying vec2 vTexCoord;
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void main() {
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gl_Position = vec4(transformVertexPositionST(aPosition, uTransformST), -1.0, 1.0);
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vTexCoord = aTexCoord * uTexScale;
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}
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