Merge "Add fractal noise support in TurbulenceNoiseShader" into udc-dev am: c8db662510 (c0478735) · Commits · e / os / android_frameworks_base

packages/SystemUI/animation/src/com/android/systemui/surfaceeffects/shaderutil/ShaderUtilLibrary.kt

+32 −3

Original line number	Diff line number	Diff line
		@@ -53,6 +53,19 @@ class ShaderUtilLibrary {
		cos(p.y * 0.01 + time * 0.005931)) * distort_amount_xy;
		}

		// Perceived luminosity (L′), not absolute luminosity.
		half getLuminosity(vec3 c) {
		return 0.3 * c.r + 0.59 * c.g + 0.11 * c.b;
		}

		// Creates a luminosity mask and clamp to the legal range.
		vec3 maskLuminosity(vec3 dest, float lum) {
		dest.rgb *= vec3(lum);
		// Clip back into the legal range
		dest = clamp(dest, vec3(0.), vec3(1.0));
		return dest;
		}

		// Return range [-1, 1].
		vec3 hash(vec3 p) {
		p = fract(p * vec3(.3456, .1234, .9876));
		@@ -62,14 +75,14 @@ class ShaderUtilLibrary {
		}

		// Skew factors (non-uniform).
		const float SKEW = 0.3333333; // 1/3
		const float UNSKEW = 0.1666667; // 1/6
		const half SKEW = 0.3333333; // 1/3
		const half UNSKEW = 0.1666667; // 1/6

		// Return range roughly [-1,1].
		// It's because the hash function (that returns a random gradient vector) returns
		// different magnitude of vectors. Noise doesn't have to be in the precise range thus
		// skipped normalize.
		float simplex3d(vec3 p) {
		half simplex3d(vec3 p) {
		// Skew the input coordinate, so that we get squashed cubical grid
		vec3 s = floor(p + (p.x + p.y + p.z) * SKEW);

		@@ -143,6 +156,22 @@ class ShaderUtilLibrary {
		// Should multiply by the possible max contribution to adjust the range in [-1,1].
		return dot(vec4(32.), nc);
		}

		// Random rotations.
		// The way you create fractal noise is layering simplex noise with some rotation.
		// To make random cloud looking noise, the rotations should not align. (Otherwise it
		// creates patterned noise).
		// Below rotations only rotate in one axis.
		const mat3 rot1 = mat3(1.0, 0. ,0., 0., 0.15, -0.98, 0., 0.98, 0.15);
		const mat3 rot2 = mat3(-0.95, 0. ,-0.3, 0., 1., 0., 0.3, 0., -0.95);
		const mat3 rot3 = mat3(1.0, 0. ,0., 0., -0.44, -0.89, 0., 0.89, -0.44);

		// Octave = 4
		// Divide each coefficient by 3 to produce more grainy noise.
		half simplex3d_fractal(vec3 mat) {
		return 0.675 * simplex3d(mat * rot1) + 0.225 * simplex3d(2.0 * mat * rot2)
		+ 0.075 * simplex3d(4.0 * mat * rot3) + 0.025 * simplex3d(8.0 * mat);
		}
		"""
		}
		}

packages/SystemUI/animation/src/com/android/systemui/surfaceeffects/turbulencenoise/TurbulenceNoiseShader.kt

+28 −19

Original line number	Diff line number	Diff line
		@@ -19,8 +19,13 @@ import android.graphics.RuntimeShader
		import com.android.systemui.surfaceeffects.shaderutil.ShaderUtilLibrary
		import java.lang.Float.max

		/** Shader that renders turbulence simplex noise, with no octave. */
		class TurbulenceNoiseShader : RuntimeShader(TURBULENCE_NOISE_SHADER) {
		/**
		* Shader that renders turbulence simplex noise, by default no octave.
		*
		* @param useFractal whether to use fractal noise (4 octaves).
		*/
		class TurbulenceNoiseShader(useFractal: Boolean = false) :
		RuntimeShader(if (useFractal) FRACTAL_NOISE_SHADER else SIMPLEX_NOISE_SHADER) {
		// language=AGSL
		companion object {
		private const val UNIFORMS =
		@@ -35,21 +40,7 @@ class TurbulenceNoiseShader : RuntimeShader(TURBULENCE_NOISE_SHADER) {
		layout(color) uniform vec4 in_backgroundColor;
		"""

		private const val SHADER_LIB =
		"""
		float getLuminosity(vec3 c) {
		return 0.3c.r + 0.59c.g + 0.11*c.b;
		}

		vec3 maskLuminosity(vec3 dest, float lum) {
		dest.rgb *= vec3(lum);
		// Clip back into the legal range
		dest = clamp(dest, vec3(0.), vec3(1.0));
		return dest;
		}
		"""

		private const val MAIN_SHADER =
		private const val SIMPLEX_SHADER =
		"""
		vec4 main(vec2 p) {
		vec2 uv = p / in_size.xy;
		@@ -71,8 +62,26 @@ class TurbulenceNoiseShader : RuntimeShader(TURBULENCE_NOISE_SHADER) {
		}
		"""

		private const val TURBULENCE_NOISE_SHADER =
		ShaderUtilLibrary.SHADER_LIB + UNIFORMS + SHADER_LIB + MAIN_SHADER
		private const val FRACTAL_SHADER =
		"""
		vec4 main(vec2 p) {
		vec2 uv = p / in_size.xy;
		uv.x *= in_aspectRatio;

		vec3 noiseP = vec3(uv + in_noiseMove.xy, in_noiseMove.z) * in_gridNum;
		float luma = simplex3d_fractal(noiseP) * in_opacity;
		vec3 mask = maskLuminosity(in_color.rgb, luma);
		vec3 color = in_backgroundColor.rgb + mask * 0.6;

		// Skip dithering.
		return vec4(color * in_color.a, in_color.a);
		}
		"""

		private const val SIMPLEX_NOISE_SHADER =
		ShaderUtilLibrary.SHADER_LIB + UNIFORMS + SIMPLEX_SHADER
		private const val FRACTAL_NOISE_SHADER =
		ShaderUtilLibrary.SHADER_LIB + UNIFORMS + FRACTAL_SHADER
		}

		/** Sets the number of grid for generating noise. */

packages/SystemUI/tests/src/com/android/systemui/surfaceeffects/turbulencenoise/TurbulenceNoiseShaderTest.kt

0 → 100644

+39 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2023 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 com.android.systemui.surfaceeffects.turbulencenoise

		import android.testing.AndroidTestingRunner
		import androidx.test.filters.SmallTest
		import com.android.systemui.SysuiTestCase
		import org.junit.Test
		import org.junit.runner.RunWith

		@SmallTest
		@RunWith(AndroidTestingRunner::class)
		class TurbulenceNoiseShaderTest : SysuiTestCase() {

		private lateinit var turbulenceNoiseShader: TurbulenceNoiseShader

		@Test
		fun compliesSimplexNoise() {
		turbulenceNoiseShader = TurbulenceNoiseShader()
		}

		@Test
		fun compliesFractalNoise() {
		turbulenceNoiseShader = TurbulenceNoiseShader(useFractal = true)
		}
		}