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42 lines
1.1 KiB
42 lines
1.1 KiB
// Copyright 2023 The Flutter team. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#define PI 3.1415926538
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uniform float uTime;
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uniform vec2 uSize;
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uniform float uDampener;
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out vec4 fragColor;
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uniform sampler2D uTexture;
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void main()
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{
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float piTime = uTime * PI * 2;
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vec2 texCoord = gl_FragCoord.xy / uSize.xy;
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float offset = 50;
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float opacSum = 0.0;
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vec4 thisCol = texture(uTexture, texCoord.xy);
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float x = texCoord.x + (offset / uSize.x * pow(sin(piTime), 4)) * uDampener;
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if (x >= 0.0 && x <= 1.0) {
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opacSum += 0.3 * texture(uTexture, vec2(x, texCoord.y)).a;
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}
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x = texCoord.x - (offset / uSize.x * pow(sin(piTime + PI), 2)) * uDampener;
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if (x >= 0.0 && x <= 1.0) {
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opacSum += 0.3 * texture(uTexture, vec2(x, texCoord.y)).a;
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}
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float y = texCoord.y + (offset / uSize.y * pow(sin(piTime + PI * 0.66), 4)) * uDampener;
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if (y >= 0.0 && y <= 1.0) {
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opacSum += 0.3 * texture(uTexture, vec2(texCoord.x, y)).a;
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}
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fragColor = vec4(0.0, 0.0, 0.0, clamp(opacSum, 0.0, 1.0));
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}
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