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67 lines
2.5 KiB
67 lines
2.5 KiB
// Copyright 2024 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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#version 460 core
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#include <flutter/runtime_effect.glsl>
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precision mediump float;
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uniform vec2 resolution;
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out vec4 fragColor;
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vec3 pink = vec3(255, 105, 180) / 255;
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// dot2 and sdHeart from https://iquilezles.org/articles/distfunctions2d/
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//
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// The MIT License
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// Copyright © 2015 Inigo Quilez
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions: The above copyright
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// notice and this permission notice shall be included in all copies or
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// substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS",
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
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// THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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// https://www.youtube.com/c/InigoQuilez
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// https://iquilezles.org
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float dot2(vec2 v) { return dot(v, v); }
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float sdHeart(in vec2 p) {
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p.x = abs(p.x);
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if (p.y + p.x > 1.0)
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return sqrt(dot2(p - vec2(0.25, 0.75))) - sqrt(2.0) / 4.0;
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return sqrt(min(dot2(p - vec2(0.00, 1.00)),
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dot2(p - 0.5 * max(p.x + p.y, 0.0)))) *
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sign(p.x - p.y);
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}
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void main() {
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vec2 st = FlutterFragCoord().xy / resolution.xy;
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// Remap coordinates.
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// Flutter normalized coordinates have range [0,1] but sdHeart expects [-1,1].
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st = (st - vec2(0.5)) * vec2(2.0);
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// Center the heart.
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// sdHeart is written such that the bottom point is at (0,0) and it's about 1
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// unit tall.
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st.y -= 0.5;
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// Invert Y coordinate.
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st.y *= -1;
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// Calculate the color of this pixel according to the heart SDF, using
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// smoothstep to anti-alias the edges.
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vec3 color = vec3(0.0);
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color = mix(pink, color, smoothstep(0.01, 0.02, sdHeart(st)));
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fragColor = vec4(color, 1);
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}
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