Add RuntimeShader API to RenderEffect
Bug: 201546136
Test: atest CtsUiRenderingTestCases:RuntimeShaderTests
Change-Id: I96ad4fcfc0486f340653878519efcc4a793191a2
diff --git a/core/api/current.txt b/core/api/current.txt
index f84322e..4b9f57e 100644
--- a/core/api/current.txt
+++ b/core/api/current.txt
@@ -16518,6 +16518,7 @@
method @NonNull public static android.graphics.RenderEffect createColorFilterEffect(@NonNull android.graphics.ColorFilter);
method @NonNull public static android.graphics.RenderEffect createOffsetEffect(float, float);
method @NonNull public static android.graphics.RenderEffect createOffsetEffect(float, float, @NonNull android.graphics.RenderEffect);
+ method @NonNull public static android.graphics.RenderEffect createRuntimeShaderEffect(@NonNull android.graphics.RuntimeShader, @NonNull String);
method @NonNull public static android.graphics.RenderEffect createShaderEffect(@NonNull android.graphics.Shader);
}
diff --git a/graphics/java/android/graphics/RenderEffect.java b/graphics/java/android/graphics/RenderEffect.java
index ad4c3fe..b8a4685 100644
--- a/graphics/java/android/graphics/RenderEffect.java
+++ b/graphics/java/android/graphics/RenderEffect.java
@@ -290,6 +290,22 @@
return new RenderEffect(nativeCreateShaderEffect(shader.getNativeInstance()));
}
+ /**
+ * Create a {@link RenderEffect} that executes the provided {@link RuntimeShader} and passes
+ * the contents of the {@link android.graphics.RenderNode} that this RenderEffect is installed
+ * on as an input to the shader.
+ * @param shader the runtime shader that will bind the inputShaderName to the RenderEffect input
+ * @param uniformShaderName the uniform name defined in the RuntimeShader's program to which
+ * the contents of the RenderNode will be bound
+ */
+ @NonNull
+ public static RenderEffect createRuntimeShaderEffect(
+ @NonNull RuntimeShader shader, @NonNull String uniformShaderName) {
+ return new RenderEffect(
+ nativeCreateRuntimeShaderEffect(shader.getNativeShaderBuilder(),
+ uniformShaderName));
+ }
+
private final long mNativeRenderEffect;
/* only constructed from static factory methods */
@@ -318,5 +334,7 @@
private static native long nativeCreateBlendModeEffect(long dst, long src, int blendmode);
private static native long nativeCreateChainEffect(long outer, long inner);
private static native long nativeCreateShaderEffect(long shader);
+ private static native long nativeCreateRuntimeShaderEffect(
+ long shaderBuilder, String inputShaderName);
private static native long nativeGetFinalizer();
}
diff --git a/libs/hwui/jni/RenderEffect.cpp b/libs/hwui/jni/RenderEffect.cpp
index a48d7f7..213f35a 100644
--- a/libs/hwui/jni/RenderEffect.cpp
+++ b/libs/hwui/jni/RenderEffect.cpp
@@ -127,6 +127,32 @@
return reinterpret_cast<jlong>(shaderFilter.release());
}
+static inline int ThrowIAEFmt(JNIEnv* env, const char* fmt, ...) {
+ va_list args;
+ va_start(args, fmt);
+ int ret = jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException", fmt, args);
+ va_end(args);
+ return ret;
+}
+
+static jlong createRuntimeShaderEffect(JNIEnv* env, jobject, jlong shaderBuilderHandle,
+ jstring inputShaderName) {
+ SkRuntimeShaderBuilder* builder =
+ reinterpret_cast<SkRuntimeShaderBuilder*>(shaderBuilderHandle);
+ ScopedUtfChars name(env, inputShaderName);
+
+ if (builder->child(name.c_str()).fChild == nullptr) {
+ ThrowIAEFmt(env,
+ "unable to find a uniform with the name '%s' of the correct "
+ "type defined by the provided RuntimeShader",
+ name.c_str());
+ return 0;
+ }
+
+ sk_sp<SkImageFilter> filter = SkImageFilters::RuntimeShader(*builder, name.c_str(), nullptr);
+ return reinterpret_cast<jlong>(filter.release());
+}
+
static void RenderEffect_safeUnref(SkImageFilter* filter) {
SkSafeUnref(filter);
}
@@ -136,15 +162,16 @@
}
static const JNINativeMethod gRenderEffectMethods[] = {
- {"nativeGetFinalizer", "()J", (void*)getRenderEffectFinalizer},
- {"nativeCreateOffsetEffect", "(FFJ)J", (void*)createOffsetEffect},
- {"nativeCreateBlurEffect", "(FFJI)J", (void*)createBlurEffect},
- {"nativeCreateBitmapEffect", "(JFFFFFFFF)J", (void*)createBitmapEffect},
- {"nativeCreateColorFilterEffect", "(JJ)J", (void*)createColorFilterEffect},
- {"nativeCreateBlendModeEffect", "(JJI)J", (void*)createBlendModeEffect},
- {"nativeCreateChainEffect", "(JJ)J", (void*)createChainEffect},
- {"nativeCreateShaderEffect", "(J)J", (void*)createShaderEffect}
-};
+ {"nativeGetFinalizer", "()J", (void*)getRenderEffectFinalizer},
+ {"nativeCreateOffsetEffect", "(FFJ)J", (void*)createOffsetEffect},
+ {"nativeCreateBlurEffect", "(FFJI)J", (void*)createBlurEffect},
+ {"nativeCreateBitmapEffect", "(JFFFFFFFF)J", (void*)createBitmapEffect},
+ {"nativeCreateColorFilterEffect", "(JJ)J", (void*)createColorFilterEffect},
+ {"nativeCreateBlendModeEffect", "(JJI)J", (void*)createBlendModeEffect},
+ {"nativeCreateChainEffect", "(JJ)J", (void*)createChainEffect},
+ {"nativeCreateShaderEffect", "(J)J", (void*)createShaderEffect},
+ {"nativeCreateRuntimeShaderEffect", "(JLjava/lang/String;)J",
+ (void*)createRuntimeShaderEffect}};
int register_android_graphics_RenderEffect(JNIEnv* env) {
android::RegisterMethodsOrDie(env, "android/graphics/RenderEffect",
diff --git a/tests/HwAccelerationTest/Android.bp b/tests/HwAccelerationTest/Android.bp
index e618ed1..51848f2 100644
--- a/tests/HwAccelerationTest/Android.bp
+++ b/tests/HwAccelerationTest/Android.bp
@@ -32,6 +32,10 @@
"**/*.java",
"**/*.kt",
],
+ static_libs: [
+ "androidx.cardview_cardview",
+ ],
+
platform_apis: true,
certificate: "platform",
}
diff --git a/tests/HwAccelerationTest/AndroidManifest.xml b/tests/HwAccelerationTest/AndroidManifest.xml
index 22fe424..b0ccbd1 100644
--- a/tests/HwAccelerationTest/AndroidManifest.xml
+++ b/tests/HwAccelerationTest/AndroidManifest.xml
@@ -789,6 +789,15 @@
</intent-filter>
</activity>
+ <activity android:name="RenderEffectViewActivity"
+ android:label="RenderEffect/View"
+ android:exported="true">
+ <intent-filter>
+ <action android:name="android.intent.action.MAIN"/>
+ <category android:name="com.android.test.hwui.TEST"/>
+ </intent-filter>
+ </activity>
+
<activity android:name="StretchShaderActivity"
android:label="RenderEffect/Stretch"
android:exported="true">
diff --git a/tests/HwAccelerationTest/res/drawable-nodpi/scratches.png b/tests/HwAccelerationTest/res/drawable-nodpi/scratches.png
new file mode 100644
index 0000000..cc8adf1
--- /dev/null
+++ b/tests/HwAccelerationTest/res/drawable-nodpi/scratches.png
Binary files differ
diff --git a/tests/HwAccelerationTest/res/drawable-nodpi/weather_2.jpg b/tests/HwAccelerationTest/res/drawable-nodpi/weather_2.jpg
new file mode 100644
index 0000000..b5aff10
--- /dev/null
+++ b/tests/HwAccelerationTest/res/drawable-nodpi/weather_2.jpg
Binary files differ
diff --git a/tests/HwAccelerationTest/res/layout/view_runtime_shader.xml b/tests/HwAccelerationTest/res/layout/view_runtime_shader.xml
new file mode 100644
index 0000000..b91377d
--- /dev/null
+++ b/tests/HwAccelerationTest/res/layout/view_runtime_shader.xml
@@ -0,0 +1,205 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+ ~ 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.
+ -->
+
+<ScrollView
+ xmlns:android="http://schemas.android.com/apk/res/android"
+ xmlns:app="http://schemas.android.com/apk/res-auto"
+ android:layout_width="match_parent"
+ android:layout_height="match_parent">
+ <LinearLayout
+ android:id="@+id/TopLayout"
+ android:layout_width="match_parent"
+ android:layout_height="wrap_content"
+ android:paddingBottom="8dp"
+ android:orientation="vertical">
+
+ <TextView
+ android:layout_width="wrap_content"
+ android:layout_height="wrap_content"
+ android:layout_margin="16dp"
+ android:text="Sample Card #1"/>
+
+ <androidx.cardview.widget.CardView
+ android:layout_width="match_parent"
+ android:layout_height="wrap_content"
+ android:layout_margin="8dp"
+ android:layout_marginBottom="16dp"
+ android:clickable="true"
+ android:focusable="true"
+ android:minHeight="148dp">
+
+ <LinearLayout
+ android:layout_width="match_parent"
+ android:layout_height="wrap_content"
+ android:orientation="vertical">
+
+ <LinearLayout
+ android:layout_width="match_parent"
+ android:layout_height="wrap_content"
+ android:padding="16dp"
+ android:paddingBottom="8dp">
+
+ <ImageView
+ android:layout_width="50dp"
+ android:layout_height="50dp"
+ android:layout_marginEnd="8dp"
+ android:layout_marginRight="8dp"
+ android:contentDescription="Logo"
+ android:src="@drawable/icon"/>
+
+ <LinearLayout
+ android:layout_width="0dp"
+ android:layout_height="wrap_content"
+ android:layout_weight="1.0"
+ android:layout_marginStart="8dp"
+ android:layout_marginLeft="8dp"
+ android:orientation="vertical">
+ <TextView
+ android:layout_width="wrap_content"
+ android:layout_height="wrap_content"
+ android:textStyle="bold"
+ android:text="Image Transition"/>
+
+ <TextView
+ android:layout_width="wrap_content"
+ android:layout_height="wrap_content"
+ android:layout_marginTop="8dp"
+ android:ellipsize="end"
+ android:maxLines="1"
+ android:text="Touch the image to trigger the animation"/>
+ </LinearLayout>
+ </LinearLayout>
+
+ <com.android.test.hwui.BitmapTransitionView
+ android:layout_width="match_parent"
+ android:layout_height="194dp"
+ android:padding="8dp"/>
+
+ </LinearLayout>
+
+ </androidx.cardview.widget.CardView>
+
+ <TextView
+ android:layout_width="wrap_content"
+ android:layout_height="wrap_content"
+ android:layout_margin="16dp"
+ android:text="Sample Card #2"/>
+
+ <androidx.cardview.widget.CardView
+ android:id="@+id/CardView"
+ android:layout_width="match_parent"
+ android:layout_height="wrap_content"
+ android:layout_margin="8dp"
+ android:layout_marginBottom="16dp"
+ android:clickable="true"
+ android:focusable="true"
+ android:minHeight="148dp">
+
+ <LinearLayout
+ android:layout_width="match_parent"
+ android:layout_height="wrap_content"
+ android:paddingTop="16dp"
+ android:orientation="vertical">
+
+ <LinearLayout
+ android:layout_width="match_parent"
+ android:layout_height="wrap_content"
+ android:padding="16dp"
+ android:paddingBottom="8dp">
+
+ <ImageView
+ android:layout_width="50dp"
+ android:layout_height="50dp"
+ android:layout_marginEnd="8dp"
+ android:layout_marginRight="8dp"
+ android:contentDescription="Logo"
+ android:src="@drawable/icon"/>
+
+ <LinearLayout
+ android:layout_width="0dp"
+ android:layout_height="wrap_content"
+ android:layout_weight="1.0"
+ android:layout_marginStart="8dp"
+ android:layout_marginLeft="8dp"
+ android:orientation="vertical">
+ <TextView
+ android:layout_width="wrap_content"
+ android:layout_height="wrap_content"
+ android:textStyle="bold"
+ android:text="View Group Manipulation"/>
+
+ <TextView
+ android:layout_width="wrap_content"
+ android:layout_height="wrap_content"
+ android:layout_marginTop="8dp"
+ android:ellipsize="end"
+ android:maxLines="1"
+ android:text="Tap the card to trigger the animation"/>
+ </LinearLayout>
+ </LinearLayout>
+
+ <ImageView
+ android:layout_width="match_parent"
+ android:layout_height="194dp"
+ android:background="@android:color/transparent"
+ android:src="@drawable/weather_2"/>
+
+ <LinearLayout
+ android:layout_width="match_parent"
+ android:layout_height="wrap_content"
+ android:padding="16dp"
+ android:paddingBottom="8dp"
+ android:orientation="vertical">
+
+ <LinearLayout
+ android:layout_width="match_parent"
+ android:layout_height="wrap_content">
+ <RatingBar
+ android:layout_width="wrap_content"
+ android:layout_height="wrap_content"
+ android:contentDescription="Card Rating"
+ android:isIndicator="true"
+ android:numStars="5"
+ android:rating="4.5"
+
+ android:stepSize="0.5"/>
+ <TextView
+ android:layout_width="wrap_content"
+ android:layout_height="match_parent"
+ android:gravity="center_vertical"
+ android:text="Category 4.5 Storm"/>
+ </LinearLayout>
+
+ <TextView
+ android:layout_width="wrap_content"
+ android:layout_height="wrap_content"
+ android:layout_marginTop="8dp"
+ android:maxLines="3"
+ android:textIsSelectable="true"
+ android:text="Lorem ipsum dolor sit amet, nec no nominavi scaevola. Per et
+ sint sapientem, nobis perpetua salutandi mei te. Quo tamquam probatus
+ reprehendunt in. Eos esse purto eruditi ea. Enim tation persius ut sea,
+ eos ad consul populo. Ne eum solet altera. Cibo eligendi et est, electram
+ theophrastus te vel eu."/>
+
+ </LinearLayout>
+
+ </LinearLayout>
+
+ </androidx.cardview.widget.CardView>
+ </LinearLayout>
+</ScrollView>
diff --git a/tests/HwAccelerationTest/res/values/styles.xml b/tests/HwAccelerationTest/res/values/styles.xml
index fa5437f..55f4dd69 100644
--- a/tests/HwAccelerationTest/res/values/styles.xml
+++ b/tests/HwAccelerationTest/res/values/styles.xml
@@ -41,4 +41,5 @@
<item name="android:spotShadowAlpha">1</item>
-->
</style>
+
</resources>
diff --git a/tests/HwAccelerationTest/src/com/android/test/hwui/BitmapTransitionView.kt b/tests/HwAccelerationTest/src/com/android/test/hwui/BitmapTransitionView.kt
new file mode 100644
index 0000000..d3ad9e8
--- /dev/null
+++ b/tests/HwAccelerationTest/src/com/android/test/hwui/BitmapTransitionView.kt
@@ -0,0 +1,138 @@
+/*
+ * 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 com.android.test.hwui
+
+import android.animation.ValueAnimator
+import android.content.Context
+import android.graphics.BitmapShader
+import android.graphics.Canvas
+import android.graphics.ImageDecoder
+import android.graphics.Matrix
+import android.graphics.Paint
+import android.graphics.RuntimeShader
+import android.graphics.Shader
+import android.util.AttributeSet
+import android.view.View
+
+class BitmapTransitionView @JvmOverloads constructor(
+ context: Context,
+ attrs: AttributeSet? = null,
+ defStyleAttr: Int = 0
+) : View(context, attrs, defStyleAttr) {
+
+ private val mPaint = Paint()
+ private val mImageA = ImageDecoder.decodeBitmap(
+ ImageDecoder.createSource(context.resources, R.drawable.large_photo))
+ private val mImageB = ImageDecoder.decodeBitmap(
+ ImageDecoder.createSource(context.resources, R.drawable.very_large_photo))
+ private val mShaderA = BitmapShader(mImageA, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)
+ private val mShaderB = BitmapShader(mImageB, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)
+ private val mShader = RuntimeShader(AGSL, false)
+ private var mCurrentProgress = -1f
+ private var mForwardProgress = true
+ private var mCurrentAnimator = ValueAnimator.ofFloat(-1f, 1f)
+
+ init {
+ isClickable = true
+
+ mCurrentAnimator.duration = 1500
+ mCurrentAnimator.addUpdateListener { animation ->
+ mCurrentProgress = animation.animatedValue as Float
+ postInvalidate()
+ }
+ }
+
+ override fun performClick(): Boolean {
+ if (super.performClick()) return true
+
+ if (mCurrentAnimator.isRunning) {
+ mCurrentAnimator.reverse()
+ return true
+ }
+
+ if (mForwardProgress) {
+ mCurrentAnimator.setFloatValues(-1f, 1f)
+ mForwardProgress = false
+ } else {
+ mCurrentAnimator.setFloatValues(1f, -1f)
+ mForwardProgress = true
+ }
+
+ mCurrentAnimator.start()
+ postInvalidate()
+ return true
+ }
+
+ override fun onSizeChanged(width: Int, height: Int, oldWidth: Int, oldHeight: Int) {
+ val matrixA = Matrix()
+ val matrixB = Matrix()
+
+ matrixA.postScale(width.toFloat() / mImageA.width, height.toFloat() / mImageA.height)
+ matrixB.postScale(width.toFloat() / mImageB.width, height.toFloat() / mImageB.height)
+
+ mShaderA.setLocalMatrix(matrixA)
+ mShaderB.setLocalMatrix(matrixB)
+ }
+
+ override fun onDraw(canvas: Canvas) {
+ super.onDraw(canvas)
+
+ mShader.setInputShader("imageA", mShaderA)
+ mShader.setInputShader("imageB", mShaderB)
+ mShader.setIntUniform("imageDimensions", width, height)
+ mShader.setFloatUniform("progress", mCurrentProgress)
+
+ mPaint.shader = mShader
+ canvas.drawRect(0f, 0f, width.toFloat(), height.toFloat(), mPaint)
+ }
+
+ private companion object {
+ const val AGSL = """
+ uniform shader imageA;
+ uniform shader imageB;
+ uniform ivec2 imageDimensions;
+ uniform float progress;
+
+ const vec2 iSize = vec2(48.0, 48.0);
+ const float iDir = 0.5;
+ const float iRand = 0.81;
+
+ float hash12(vec2 p) {
+ vec3 p3 = fract(vec3(p.xyx) * .1031);
+ p3 += dot(p3, p3.yzx + 33.33);
+ return fract((p3.x + p3.y) * p3.z);
+ }
+
+ float ramp(float2 p) {
+ return mix(hash12(p),
+ dot(p/vec2(imageDimensions), float2(iDir, 1 - iDir)),
+ iRand);
+ }
+
+ half4 main(float2 p) {
+ float2 lowRes = p / iSize;
+ float2 cellCenter = (floor(lowRes) + 0.5) * iSize;
+ float2 posInCell = fract(lowRes) * 2 - 1;
+
+ float v = ramp(cellCenter) + progress;
+ float distToCenter = max(abs(posInCell.x), abs(posInCell.y));
+
+ return distToCenter > v ? imageA.eval(p).rgb1 : imageB.eval(p).rgb1;
+ }
+ """
+ }
+}
\ No newline at end of file
diff --git a/tests/HwAccelerationTest/src/com/android/test/hwui/RenderEffectViewActivity.kt b/tests/HwAccelerationTest/src/com/android/test/hwui/RenderEffectViewActivity.kt
new file mode 100644
index 0000000..06280d2
--- /dev/null
+++ b/tests/HwAccelerationTest/src/com/android/test/hwui/RenderEffectViewActivity.kt
@@ -0,0 +1,109 @@
+/*
+ * 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 com.android.test.hwui
+
+import android.animation.ValueAnimator
+import android.app.Activity
+import android.graphics.Bitmap
+import android.graphics.BitmapShader
+import android.graphics.ImageDecoder
+import android.graphics.Matrix
+import android.graphics.Shader
+import android.graphics.RenderEffect
+import android.graphics.RuntimeShader
+import android.os.Bundle
+import android.view.View
+
+class RenderEffectViewActivity : Activity() {
+
+ private val mDropsShader = RuntimeShader(dropsAGSL, false)
+ private var mDropsAnimator = ValueAnimator.ofFloat(0f, 1f)
+ private var mStartTime = System.currentTimeMillis()
+ private lateinit var mScratchesImage: Bitmap
+ private lateinit var mScratchesShader: BitmapShader
+
+ override fun onCreate(savedInstanceState: Bundle?) {
+ super.onCreate(savedInstanceState)
+ setContentView(R.layout.view_runtime_shader)
+
+ val dropsView = findViewById<View>(R.id.CardView)!!
+ dropsView.isClickable = true
+ dropsView.setOnClickListener {
+ if (mDropsAnimator.isRunning) {
+ mDropsAnimator.cancel()
+ dropsView.setRenderEffect(null)
+ } else {
+ mDropsAnimator.start()
+ }
+ }
+
+ val imgSource = ImageDecoder.createSource(resources, R.drawable.scratches)
+ mScratchesImage = ImageDecoder.decodeBitmap(imgSource)
+ mScratchesShader = BitmapShader(mScratchesImage,
+ Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)
+
+ mDropsAnimator.duration = 1000
+ mDropsAnimator.repeatCount = ValueAnimator.INFINITE
+ mDropsAnimator.addUpdateListener { _ ->
+ val viewWidth = dropsView.width.toFloat()
+ val viewHeight = dropsView.height.toFloat()
+ val scratchesMatrix = Matrix()
+ scratchesMatrix.postScale(viewWidth / mScratchesImage.width,
+ viewHeight / mScratchesImage.height)
+ mScratchesShader.setLocalMatrix(scratchesMatrix)
+
+ mDropsShader.setInputShader("scratches", mScratchesShader)
+ mDropsShader.setFloatUniform("elapsedSeconds",
+ (System.currentTimeMillis() - mStartTime) / 1000f)
+ mDropsShader.setFloatUniform("viewDimensions", viewWidth, viewHeight)
+
+ val dropsEffect = RenderEffect.createRuntimeShaderEffect(mDropsShader, "background")
+ val blurEffect = RenderEffect.createBlurEffect(10f, 10f, Shader.TileMode.CLAMP)
+
+ dropsView.setRenderEffect(RenderEffect.createChainEffect(dropsEffect, blurEffect))
+ }
+ }
+
+ private companion object {
+ const val dropsAGSL = """
+ uniform float elapsedSeconds;
+ uniform vec2 viewDimensions;
+ uniform shader background;
+ uniform shader scratches;
+
+ vec2 dropsUV(vec2 fragCoord ) {
+ vec2 uv = fragCoord.xy / viewDimensions.xy; // 0 <> 1
+ vec2 offs = vec2(0.);
+ return (offs + uv).xy;
+ }
+
+ const vec3 iFrostColorRGB = vec3(0.5, 0.5, 0.5);
+ const float iFrostColorAlpha = .3;
+
+ half4 main(float2 fragCoord) {
+ half4 bg = background.eval(dropsUV(fragCoord)*viewDimensions.xy);
+ float2 scratchCoord = fragCoord.xy / viewDimensions.xy;;
+ scratchCoord += 1.5;
+ scratchCoord = mod(scratchCoord, 1);
+ half scratch = scratches.eval(scratchCoord*viewDimensions.xy).r;
+ bg.rgb = mix(bg.rgb, iFrostColorRGB, iFrostColorAlpha);
+ bg.rgb = mix(bg.rgb, half3(1), pow(scratch,3));
+ return bg;
+ }
+ """
+ }
+}
\ No newline at end of file
