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/*
* 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.google.android.wallpaper.weathereffects.fog
import android.graphics.BitmapShader
import android.graphics.Canvas
import android.graphics.Paint
import android.graphics.Shader
import android.util.SizeF
import com.google.android.torus.utils.extensions.getAspectRatio
import com.google.android.wallpaper.weathereffects.WeatherEffect
import com.google.android.wallpaper.weathereffects.utils.ImageCrop
import kotlin.math.sin
import kotlin.random.Random
/** Defines and generates the fog weather effect animation. */
class FogEffect(
private val fogConfig: FogEffectConfig,
/** The initial size of the surface where the effect will be shown. */
surfaceSize: SizeF
) : WeatherEffect {
private val fogPaint = Paint().also { it.shader = fogConfig.colorGradingShader }
private var elapsedTime: Float = 0f
init {
updateTextureUniforms()
adjustCropping(surfaceSize)
prepareColorGrading()
}
override fun resize(newSurfaceSize: SizeF) = adjustCropping(newSurfaceSize)
override fun update(deltaMillis: Long, frameTimeNanos: Long) {
val time = 0.02f * frameTimeNanos.toFloat() * NANOS_TO_SECONDS
// Variation range [1, 1.5]. We don't want the variation to be 0.
val variation = (sin(time + sin(3f * time)) * 0.5f + 0.5f) * 1.5f
elapsedTime += variation * deltaMillis * MILLIS_TO_SECONDS
fogConfig.shader.setFloatUniform("timeBackground", elapsedTime * 1.5f)
fogConfig.shader.setFloatUniform("timeForeground", elapsedTime * 2.0f)
fogConfig.colorGradingShader.setInputShader("texture", fogConfig.shader)
}
override fun draw(canvas: Canvas) {
canvas.drawPaint(fogPaint)
}
override fun reset() {
elapsedTime = Random.nextFloat() * 90f
}
override fun release() {
fogConfig.lut?.recycle()
}
private fun adjustCropping(surfaceSize: SizeF) {
val imageCropFgd = ImageCrop.centerCoverCrop(
surfaceSize.width,
surfaceSize.height,
fogConfig.foreground.width.toFloat(),
fogConfig.foreground.height.toFloat()
)
fogConfig.shader.setFloatUniform(
"uvOffsetFgd",
imageCropFgd.leftOffset,
imageCropFgd.topOffset
)
fogConfig.shader.setFloatUniform(
"uvScaleFgd",
imageCropFgd.horizontalScale,
imageCropFgd.verticalScale
)
val imageCropBgd = ImageCrop.centerCoverCrop(
surfaceSize.width,
surfaceSize.height,
fogConfig.background.width.toFloat(),
fogConfig.background.height.toFloat()
)
fogConfig.shader.setFloatUniform(
"uvOffsetBgd",
imageCropBgd.leftOffset,
imageCropBgd.topOffset
)
fogConfig.shader.setFloatUniform(
"uvScaleBgd",
imageCropBgd.horizontalScale,
imageCropBgd.verticalScale
)
fogConfig.shader.setFloatUniform("screenSize", surfaceSize.width, surfaceSize.height)
fogConfig.shader.setFloatUniform("screenAspectRatio", surfaceSize.getAspectRatio())
}
private fun updateTextureUniforms() {
fogConfig.shader.setInputBuffer(
"foreground",
BitmapShader(fogConfig.foreground, Shader.TileMode.MIRROR, Shader.TileMode.MIRROR)
)
fogConfig.shader.setInputBuffer(
"background",
BitmapShader(fogConfig.background, Shader.TileMode.MIRROR, Shader.TileMode.MIRROR)
)
fogConfig.shader.setFloatUniform("pixelDensity", fogConfig.pixelDensity)
}
private fun prepareColorGrading() {
fogConfig.colorGradingShader.setInputShader("texture", fogConfig.shader)
fogConfig.lut?.let {
fogConfig.colorGradingShader.setInputShader(
"lut",
BitmapShader(it, Shader.TileMode.MIRROR, Shader.TileMode.MIRROR)
)
}
fogConfig.colorGradingShader.setFloatUniform(
"intensity",
fogConfig.colorGradingIntensity
)
}
private companion object {
private const val MILLIS_TO_SECONDS = 1 / 1000f
private const val NANOS_TO_SECONDS = 1 / 1_000_000_000f
}
}
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