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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.graphics.drawable;
import android.annotation.ColorInt;
import android.graphics.Color;
import android.graphics.RuntimeShader;
import android.graphics.Shader;
final class RippleShader extends RuntimeShader {
private static final String SHADER_UNIFORMS = "uniform vec2 in_origin;\n"
+ "uniform float in_progress;\n"
+ "uniform float in_maxRadius;\n"
+ "uniform vec2 in_resolution;\n"
+ "uniform float in_hasMask;\n"
+ "uniform float in_secondsOffset;\n"
+ "uniform vec4 in_color;\n"
+ "uniform shader in_shader;\n";
private static final String SHADER_LIB =
"float triangleNoise(vec2 n) {\n"
+ " n = fract(n * vec2(5.3987, 5.4421));\n"
+ " n += dot(n.yx, n.xy + vec2(21.5351, 14.3137));\n"
+ " float xy = n.x * n.y;\n"
+ " return fract(xy * 95.4307) + fract(xy * 75.04961) - 1.0;\n"
+ "}"
+ "const float PI = 3.1415926535897932384626;\n"
+ "\n"
+ "float threshold(float v, float l, float h) {\n"
+ " return step(l, v) * (1.0 - step(h, v));\n"
+ "}\n"
+ "\n"
+ "float sparkles(vec2 uv, float t) {\n"
+ " float n = triangleNoise(uv);\n"
+ " float s = 0.0;\n"
+ " for (float i = 0; i < 4; i += 1) {\n"
+ " float l = i * 0.25;\n"
+ " float h = l + 0.025;\n"
+ " float o = abs(sin(0.1 * PI * (t + i)));\n"
+ " s += threshold(n + o, l, h);\n"
+ " }\n"
+ " return saturate(s);\n"
+ "}\n"
+ "\n"
+ "float softCircle(vec2 uv, vec2 xy, float radius, float blur) {\n"
+ " float blurHalf = blur * 0.5;\n"
+ " float d = distance(uv, xy);\n"
+ " return 1. - smoothstep(1. - blurHalf, 1. + blurHalf, d / radius);\n"
+ "}\n"
+ "\n"
+ "float getRingMask(vec2 frag, vec2 center, float r, float progress) {\n"
+ " float dist = distance(frag, center);\n"
+ " float expansion = r * .6;\n"
+ " r = r * min(1.,progress);\n"
+ " float minD = max(r - expansion, 0.);\n"
+ " float maxD = r + expansion;\n"
+ " if (dist > maxD || dist < minD) return .0;\n"
+ " return min(maxD - dist, dist - minD) / expansion; \n"
+ "}\n"
+ "\n"
+ "float subProgress(float start, float end, float progress) {\n"
+ " float sub = clamp(progress, start, end);\n"
+ " return (sub - start) / (end - start); \n"
+ "}\n";
private static final String SHADER_MAIN = "vec4 main(vec2 p) {\n"
+ " float fadeIn = subProgress(0., 0.175, in_progress);\n"
+ " float fadeOutNoise = subProgress(0.375, 1., in_progress);\n"
+ " float fadeOutRipple = subProgress(0.375, 0.75, in_progress);\n"
+ " float ring = getRingMask(p, in_origin, in_maxRadius, fadeIn);\n"
+ " float alpha = min(fadeIn, 1. - fadeOutNoise);\n"
+ " float sparkle = sparkles(p, in_progress * 0.25 + in_secondsOffset)\n"
+ " * ring * alpha;\n"
+ " float fade = min(fadeIn, 1.-fadeOutRipple);\n"
+ " vec4 circle = in_color * (softCircle(p, in_origin, in_maxRadius "
+ " * fadeIn, 0.2) * fade);\n"
+ " float mask = in_hasMask == 1. ? sample(in_shader).a > 0. ? 1. : 0. : 1.;\n"
+ " return mix(circle, vec4(sparkle), sparkle) * mask;\n"
+ "}";
private static final String SHADER = SHADER_UNIFORMS + SHADER_LIB + SHADER_MAIN;
RippleShader() {
super(SHADER, false);
}
public void setShader(Shader shader) {
if (shader != null) {
setInputShader("in_shader", shader);
}
setUniform("in_hasMask", shader == null ? 0 : 1);
}
public void setRadius(float radius) {
setUniform("in_maxRadius", radius);
}
/**
* Continuous offset used as noise phase.
*/
public void setSecondsOffset(float t) {
setUniform("in_secondsOffset", t);
}
public void setOrigin(float x, float y) {
setUniform("in_origin", new float[] {x, y});
}
public void setProgress(float progress) {
setUniform("in_progress", progress);
}
/**
* Color of the circle that's under the sparkles. Sparkles will always be white.
*/
public void setColor(@ColorInt int colorIn) {
Color color = Color.valueOf(colorIn);
this.setUniform("in_color", new float[] {color.red(),
color.green(), color.blue(), color.alpha()});
}
public void setResolution(float w, float h) {
setUniform("in_resolution", w, h);
}
}
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