42 lines
1.2 KiB
Plaintext
42 lines
1.2 KiB
Plaintext
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#version 330
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// pathfinder/shaders/tile_alpha_dodgeburn.fs.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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// Color dodge and color burn blend modes.
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#extension GL_GOOGLE_include_directive : enable
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precision highp float;
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uniform int uBurn;
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out vec4 oFragColor;
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#include "tile_alpha_sample.inc.glsl"
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void main() {
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vec4 srcRGBA = sampleSrcColor();
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vec4 destRGBA = sampleDestColor();
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vec3 dest = uBurn == 0 ? destRGBA.rgb : vec3(1.0) - destRGBA.rgb;
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vec3 src = uBurn == 0 ? vec3(1.0) - srcRGBA.rgb : srcRGBA.rgb;
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bvec3 srcNonzero = notEqual(src, vec3(0.0));
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vec3 blended = min(vec3(srcNonzero.x ? dest.x / src.x : 1.0,
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srcNonzero.y ? dest.y / src.y : 1.0,
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srcNonzero.z ? dest.z / src.z : 1.0),
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vec3(1.0));
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if (uBurn != 0)
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blended = vec3(1.0) - blended;
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oFragColor = blendColors(destRGBA, srcRGBA, blended);
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}
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