52 lines
1.4 KiB
Plaintext
52 lines
1.4 KiB
Plaintext
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#version 330
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// pathfinder/shaders/tile_clip_combine.vs.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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precision highp float;
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#ifdef GL_ES
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precision highp sampler2D;
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#endif
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uniform vec2 uFramebufferSize;
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in ivec2 aTileOffset;
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in int aDestTileIndex;
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in int aDestBackdrop;
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in int aSrcTileIndex;
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in int aSrcBackdrop;
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out vec2 vTexCoord0;
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out float vBackdrop0;
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out vec2 vTexCoord1;
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out float vBackdrop1;
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void main() {
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vec2 destPosition = vec2(ivec2(aDestTileIndex % 256, aDestTileIndex / 256) + aTileOffset);
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vec2 srcPosition = vec2(ivec2(aSrcTileIndex % 256, aSrcTileIndex / 256) + aTileOffset);
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destPosition *= vec2(16.0, 4.0) / uFramebufferSize;
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srcPosition *= vec2(16.0, 4.0) / uFramebufferSize;
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vTexCoord0 = destPosition;
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vTexCoord1 = srcPosition;
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vBackdrop0 = float(aDestBackdrop);
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vBackdrop1 = float(aSrcBackdrop);
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if (aDestTileIndex < 0)
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destPosition = vec2(0.0);
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#ifdef PF_ORIGIN_UPPER_LEFT
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destPosition.y = 1.0 - destPosition.y;
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#endif
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gl_Position = vec4(mix(vec2(-1.0), vec2(1.0), destPosition), 0.0, 1.0);
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}
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