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17 lines
448 B
17 lines
448 B
// Copyright 2023 The Flutter Authors. 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 M_PI 3.14159265
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#define M_INVPI 0.31830989
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float hash_1d(float v) {
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float u = 50.0 * sin(v * 3000.0);
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return 2.0 * fract(2.0 * u * u) - 1.0;
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}
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float hash_2d(vec2 pos) {
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vec2 uv = 50.0 * fract(pos * M_INVPI);
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return 2.0 * fract(uv.x * uv.y * (uv.x + uv.y)) - 1.0;
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}
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