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MainActivity.java
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MainActivity.java
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/*
* Copyright (C) 2020 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.filament.pagecurl;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.opengl.Matrix;
import android.os.Bundle;
import android.view.Choreographer;
import android.view.MotionEvent;
import android.view.Surface;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.util.Log;
import com.google.android.filament.Camera;
import com.google.android.filament.Engine;
import com.google.android.filament.Entity;
import com.google.android.filament.EntityManager;
import com.google.android.filament.Fence;
import com.google.android.filament.Filament;
import com.google.android.filament.IndirectLight;
import com.google.android.filament.LightManager;
import com.google.android.filament.Renderer;
import com.google.android.filament.Scene;
import com.google.android.filament.Skybox;
import com.google.android.filament.SwapChain;
import com.google.android.filament.Texture;
import com.google.android.filament.TransformManager;
import com.google.android.filament.Viewport;
import com.google.android.filament.android.DisplayHelper;
import com.google.android.filament.android.FilamentHelper;
import com.google.android.filament.android.TextureHelper;
import com.google.android.filament.android.UiHelper;
public class MainActivity extends Activity
implements Choreographer.FrameCallback, UiHelper.RendererCallback, View.OnTouchListener {
static {
Filament.init();
}
private SurfaceView mSurfaceView;
private UiHelper mUiHelper;
private DisplayHelper mDisplayHelper;
private Choreographer mChoreographer;
private Engine mEngine;
private SwapChain mSwapChain;
private com.google.android.filament.View mView;
private Renderer mRenderer;
private Camera mCamera;
private Page mPage;
private PageMaterials mPageMaterials;
private Scene mScene;
private final Texture[] mTextures = new Texture[2];
private @Entity int mLight;
private IndirectLight mIndirectLight;
private final float[] mTouchDownPoint = new float[2];
private float mTouchDownValue = 0;
private float mPageAnimationRadians = 0;
private float mPageAnimationValue = 0;
@Override
public void onNativeWindowChanged(Surface surface) {
if (mSwapChain != null) {
mEngine.destroySwapChain(mSwapChain);
}
mSwapChain = mEngine.createSwapChain(surface);
mDisplayHelper.attach(mRenderer, mSurfaceView.getDisplay());
}
@Override
public void onDetachedFromSurface() {
mDisplayHelper.detach();
if (mSwapChain != null) {
mEngine.destroySwapChain(mSwapChain);
mEngine.flushAndWait();
mSwapChain = null;
}
}
@Override
public void onResized(int width, int height) {
float aspect = (float) width / (float) height;
if (aspect < 1) {
mCamera.setProjection(70.0, aspect, 1.0, 2000.0, Camera.Fov.VERTICAL);
} else {
mCamera.setProjection(60.0, aspect, 1.0, 2000.0, Camera.Fov.HORIZONTAL);
}
mView.setViewport(new Viewport(0, 0, width, height));
FilamentHelper.synchronizePendingFrames(mEngine);
}
@Override
public void doFrame(long frameTimeNanos) {
mChoreographer.postFrameCallback(this);
// Perform a rigid body rotation on the page and translate it along the Y axis.
final float[] transformMatrix = new float[16];
final double degrees = -Math.toDegrees(mPageAnimationRadians);
Matrix.setRotateM(transformMatrix, 0, (float) degrees, 0.0f, 1.0f, 0.0f);
Matrix.translateM(transformMatrix, 0, 0.0f, -0.5f, 0.0f);
TransformManager tcm = mEngine.getTransformManager();
tcm.setTransform(tcm.getInstance(mPage.renderable), transformMatrix);
if (mUiHelper.isReadyToRender() && mRenderer.beginFrame(mSwapChain, frameTimeNanos)) {
mRenderer.render(mView);
mRenderer.endFrame();
}
}
@SuppressLint("ClickableViewAccessibility")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
mSurfaceView = new SurfaceView(this);
setContentView(mSurfaceView);
mChoreographer = Choreographer.getInstance();
mDisplayHelper = new DisplayHelper(this);
mUiHelper = new UiHelper(UiHelper.ContextErrorPolicy.DONT_CHECK);
mUiHelper.setRenderCallback(this);
mUiHelper.attachTo(mSurfaceView);
mEngine = Engine.create();
mRenderer = mEngine.createRenderer();
mScene = mEngine.createScene();
mView = mEngine.createView();
mCamera = mEngine.createCamera(mEngine.getEntityManager().create());
mCamera.lookAt(0, 0, 3, 0, 0, 0, 0, 1, 0);
// Use unit-less light intensities since this is UI-style rendering, not physically based.
mCamera.setExposure(1.0f);
mLight = EntityManager.get().create();
new LightManager.Builder(LightManager.Type.DIRECTIONAL)
.color(1.0f, 1.0f, 1.0f)
.intensity(15f)
.direction(0.0f, -0.54f, -0.89f) // should be a unit vector
.castShadows(false)
.build(mEngine, mLight);
mIndirectLight = IblLoader.loadIndirectLight(getAssets(), "envs/studio_small_02_2k",
mEngine);
mIndirectLight.setIntensity(1.0f);
mScene.setIndirectLight(mIndirectLight);
mScene.addEntity(mLight);
Skybox sky = new Skybox.Builder().color(0.1f, 0.2f, 0.4f, 1.0f).build(mEngine);
mScene.setSkybox(sky);
mView.setCamera(mCamera);
mView.setScene(mScene);
mPageMaterials = new PageMaterials(mEngine, getAssets());
mPage = new PageBuilder().materials(mPageMaterials).build(mEngine, EntityManager.get());
if (mPage == null) {
throw new IllegalStateException("Unable to build page geometry.");
}
mTextures[0] = loadTexture(mEngine, R.drawable.dog);
mTextures[1] = loadTexture(mEngine, R.drawable.cat);
mPage.setTextures(mTextures[0], mTextures[1]);
mScene.addEntity(mPage.renderable);
mSurfaceView.setOnTouchListener(this);
}
@Override
protected void onResume() {
super.onResume();
mChoreographer.postFrameCallback(this);
}
@Override
protected void onPause() {
super.onPause();
mChoreographer.removeFrameCallback(this);
}
@Override
protected void onDestroy() {
super.onDestroy();
mChoreographer.removeFrameCallback(this);
mUiHelper.detach();
mEngine.destroyEntity(mLight);
mEngine.destroyEntity(mPage.renderable);
mEngine.destroyRenderer(mRenderer);
mEngine.destroyVertexBuffer(mPage.vertexBuffer);
mEngine.destroyIndexBuffer(mPage.indexBuffer);
mEngine.destroyMaterialInstance(mPage.material);
mEngine.destroyMaterial(mPageMaterials.getMaterial());
mEngine.destroyTexture(mTextures[0]);
mEngine.destroyTexture(mTextures[1]);
mEngine.destroyIndirectLight(mIndirectLight);
mEngine.destroyView(mView);
mEngine.destroyScene(mScene);
mEngine.destroyCameraComponent(mCamera.getEntity());
EntityManager.get().destroy(mPage.renderable);
EntityManager.get().destroy(mCamera.getEntity());
mEngine.destroy();
}
@SuppressLint("ClickableViewAccessibility")
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
mTouchDownPoint[0] = event.getX(0);
mTouchDownPoint[1] = event.getY(0);
mTouchDownValue = mPageAnimationValue;
return true;
}
case MotionEvent.ACTION_MOVE: {
// Compute a value in [-0.5, +0.5]
final float dx = (event.getX(0) - mTouchDownPoint[0]) / mSurfaceView.getWidth();
mPageAnimationValue = Math.min(+0.5f, Math.max(-0.5f, mTouchDownValue + dx));
// In this demo, we only care about dragging the right hand page leftwards.
final float t = -mPageAnimationValue * 3.0f;
final float rigidity = 0.1f;
final Page.CurlStyle style = Page.CurlStyle.BREEZE;
mPageAnimationRadians = mPage.updateVertices(mEngine, t, rigidity, style);
return true;
}
case MotionEvent.ACTION_UP: {
return true;
}
}
return super.onTouchEvent(event);
}
@SuppressWarnings("SameParameterValue")
private Texture loadTexture(Engine engine, int resourceId) {
Resources resources = getResources();
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPremultiplied = true;
Bitmap bitmap = BitmapFactory.decodeResource(resources, resourceId, options);
bitmap = addWhiteBorder(bitmap, 20);
Texture texture = new Texture.Builder()
.width(bitmap.getWidth())
.height(bitmap.getHeight())
.sampler(Texture.Sampler.SAMPLER_2D)
.format(Texture.InternalFormat.SRGB8_A8) // It is crucial to use an SRGB format.
.levels(0xff) // tells Filament to figure out the number of mip levels
.build(engine);
android.os.Handler handler = new android.os.Handler();
TextureHelper.setBitmap(engine, texture, 0, bitmap, handler, new Runnable() {
@Override
public void run() {
Log.i("page-curl", "Bitmap is released.");
}
});
texture.generateMipmaps(engine);
return texture;
}
@SuppressWarnings("SameParameterValue")
private Bitmap addWhiteBorder(Bitmap bmp, int borderSize) {
Bitmap modified = Bitmap.createBitmap(
bmp.getWidth() + borderSize * 2,
bmp.getHeight() + borderSize * 2,
bmp.getConfig());
Canvas canvas = new Canvas(modified);
canvas.drawColor(Color.WHITE);
canvas.drawBitmap(bmp, borderSize, borderSize, null);
return modified;
}
}