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Added a "solar flare" shader and modifier (android#1453)
The Kotlin side of this is very similar to the existing yellow striped modifier, but the shader is entirely different. Right now this isn't used anywhere but can be tested by swapping the yellowBackground with solarFlareShaderBackground.
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JetLagged/app/src/main/java/com/example/jetlagged/backgrounds/SimpleGradientBackground.kt
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| /* | ||
| * Copyright 2024 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 | ||
| * | ||
| * https://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. | ||
| */ | ||
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| package com.example.jetlagged.backgrounds | ||
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| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.draw.drawWithCache | ||
| import androidx.compose.ui.graphics.Brush | ||
| import com.example.jetlagged.ui.theme.White | ||
| import com.example.jetlagged.ui.theme.Yellow | ||
| import com.example.jetlagged.ui.theme.YellowVariant | ||
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| fun Modifier.simpleGradient(): Modifier = | ||
| drawWithCache { | ||
| val gradientBrush = Brush.verticalGradient(listOf(Yellow, YellowVariant, White)) | ||
| onDrawBehind { | ||
| drawRect(gradientBrush, alpha = 1f) | ||
| } | ||
| } |
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JetLagged/app/src/main/java/com/example/jetlagged/backgrounds/SolarFlareShaderBackground.kt
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| /* | ||
| * Copyright 2024 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 | ||
| * | ||
| * https://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. | ||
| */ | ||
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| package com.example.jetlagged.backgrounds | ||
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| import android.graphics.RuntimeShader | ||
| import android.os.Build | ||
| import androidx.annotation.RequiresApi | ||
| import androidx.compose.animation.core.withInfiniteAnimationFrameMillis | ||
| import androidx.compose.runtime.mutableFloatStateOf | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.graphics.ShaderBrush | ||
| import androidx.compose.ui.graphics.drawscope.ContentDrawScope | ||
| import androidx.compose.ui.node.DrawModifierNode | ||
| import androidx.compose.ui.node.ModifierNodeElement | ||
| import com.example.jetlagged.ui.theme.Yellow | ||
| import kotlinx.coroutines.launch | ||
| import org.intellij.lang.annotations.Language | ||
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| /** | ||
| * Background modifier that displays a custom shader for Android T and above and a linear gradient | ||
| * for older versions of Android | ||
| */ | ||
| fun Modifier.solarFlareShaderBackground(): Modifier = | ||
| if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) { | ||
| this.then(SolarFlareShaderBackgroundElement) | ||
| } else { | ||
| this.then(Modifier.simpleGradient()) | ||
| } | ||
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| @RequiresApi(Build.VERSION_CODES.TIRAMISU) | ||
| private data object SolarFlareShaderBackgroundElement : | ||
| ModifierNodeElement<SolarFlairShaderBackgroundNode>() { | ||
| override fun create() = SolarFlairShaderBackgroundNode() | ||
| override fun update(node: SolarFlairShaderBackgroundNode) { | ||
| } | ||
| } | ||
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| @RequiresApi(Build.VERSION_CODES.TIRAMISU) | ||
| private class SolarFlairShaderBackgroundNode : DrawModifierNode, Modifier.Node() { | ||
| private val shader = RuntimeShader(SHADER) | ||
| private val shaderBrush = ShaderBrush(shader) | ||
| private val time = mutableFloatStateOf(0f) | ||
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| init { | ||
| shader.setColorUniform( | ||
| "baseColor", | ||
| android.graphics.Color.valueOf(Yellow.red, Yellow.green, Yellow.blue, Yellow.alpha) | ||
| ) | ||
| } | ||
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| override fun ContentDrawScope.draw() { | ||
| shader.setFloatUniform("resolution", size.width, size.height) | ||
| shader.setFloatUniform("time", time.floatValue) | ||
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| drawRect(shaderBrush) | ||
| drawContent() | ||
| } | ||
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| override fun onAttach() { | ||
| coroutineScope.launch { | ||
| while (isAttached) { | ||
| withInfiniteAnimationFrameMillis { | ||
| time.floatValue = it / 1000f | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| @Language("AGSL") | ||
| private val SHADER = """ | ||
| uniform float2 resolution; | ||
| uniform float time; | ||
| layout(color) uniform half4 baseColor; | ||
| const int ITERATIONS = 2; | ||
| const float INTENSITY = 100.0; | ||
| const float TIME_MULTIPLIER = 0.25; | ||
| float4 main(in float2 fragCoord) { | ||
| // Slow down the animation to be more soothing | ||
| float calculatedTime = time * TIME_MULTIPLIER; | ||
| // Coords | ||
| float2 uv = fragCoord / resolution.xy; | ||
| float2 uvCalc = (uv * 5.0) - (INTENSITY * 2.0); | ||
| // Values to adjust per iteration | ||
| float2 iterationChange = float2(uvCalc); | ||
| float colorPart = 1.0; | ||
| for (int i = 0; i < ITERATIONS; i++) { | ||
| iterationChange = uvCalc + float2( | ||
| cos(calculatedTime + iterationChange.x) + | ||
| sin(calculatedTime - iterationChange.y), | ||
| cos(calculatedTime - iterationChange.x) + | ||
| sin(calculatedTime + iterationChange.y) | ||
| ); | ||
| colorPart += 0.8 / length( | ||
| float2(uvCalc.x / (cos(iterationChange.x + calculatedTime) * INTENSITY), | ||
| uvCalc.y / (sin(iterationChange.y + calculatedTime) * INTENSITY) | ||
| ) | ||
| ); | ||
| } | ||
| colorPart = 1.6 - (colorPart / float(ITERATIONS)); | ||
| // Fade out the bottom on a curve | ||
| float alpha = 1.0 - (uv.y * uv.y); | ||
| // Mix calculated color with the incoming base color | ||
| float4 color = float4(colorPart * baseColor.r, colorPart * baseColor.g, colorPart * baseColor.b, alpha); | ||
| // Keep all channels within valid bounds of 0.0 and 1.0 | ||
| return clamp(color, 0.0, 1.0); | ||
| } | ||
| """.trimIndent() |
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