| /* |
| * Copyright (C) 2011 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.nfc; |
| |
| import android.content.Context; |
| import android.graphics.Bitmap; |
| import android.graphics.BitmapFactory; |
| import android.graphics.SurfaceTexture; |
| import android.opengl.GLUtils; |
| import android.util.Log; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| import java.nio.FloatBuffer; |
| import java.nio.ShortBuffer; |
| |
| import javax.microedition.khronos.egl.EGL10; |
| import javax.microedition.khronos.egl.EGLConfig; |
| import javax.microedition.khronos.egl.EGLContext; |
| import javax.microedition.khronos.egl.EGLDisplay; |
| import javax.microedition.khronos.egl.EGLSurface; |
| import javax.microedition.khronos.opengles.GL10; |
| |
| public class FireflyRenderer { |
| private static final String LOG_TAG = "NfcFireflyThread"; |
| |
| static final int NUM_FIREFLIES = 200; |
| |
| static final float NEAR_CLIPPING_PLANE = 50f; |
| static final float FAR_CLIPPING_PLANE = 100f; |
| |
| // All final variables below only need to be allocated once |
| // and can be reused between subsequent Beams |
| static final int[] sEglConfig = { |
| EGL10.EGL_RED_SIZE, 8, |
| EGL10.EGL_GREEN_SIZE, 8, |
| EGL10.EGL_BLUE_SIZE, 8, |
| EGL10.EGL_ALPHA_SIZE, 0, |
| EGL10.EGL_DEPTH_SIZE, 0, |
| EGL10.EGL_STENCIL_SIZE, 0, |
| EGL10.EGL_NONE |
| }; |
| |
| // Vertices for drawing a 32x32 rect |
| static final float mVertices[] = { |
| 0.0f, 0.0f, 0.0f, // 0, Top Left |
| 0.0f, 32.0f, 0.0f, // 1, Bottom Left |
| 32.0f, 32.0f, 0.0f, // 2, Bottom Right |
| 32.0f, 0.0f, 0.0f, // 3, Top Right |
| }; |
| |
| // Mapping coordinates for the texture |
| static final float mTextCoords[] = { |
| 0.0f, 0.0f, |
| 1.0f, 0.0f, |
| 1.0f, 1.0f, |
| 0.0f, 1.0f |
| }; |
| |
| // Connecting order (draws a square) |
| static final short[] mIndices = { 0, 1, 2, 0, 2, 3 }; |
| |
| final Context mContext; |
| |
| // Buffer holding the vertices |
| final FloatBuffer mVertexBuffer; |
| |
| // Buffer holding the indices |
| final ShortBuffer mIndexBuffer; |
| |
| // Buffer holding the texture mapping coordinates |
| final FloatBuffer mTextureBuffer; |
| |
| final Firefly[] mFireflies; |
| |
| FireflyRenderThread mFireflyRenderThread; |
| |
| // The surface to render the flies on, including width and height |
| SurfaceTexture mSurface; |
| int mDisplayWidth; |
| int mDisplayHeight; |
| |
| public FireflyRenderer(Context context) { |
| mContext = context; |
| |
| // First, build the vertex, texture and index buffers |
| ByteBuffer vbb = ByteBuffer.allocateDirect(mVertices.length * 4); // Float => 4 bytes |
| vbb.order(ByteOrder.nativeOrder()); |
| mVertexBuffer = vbb.asFloatBuffer(); |
| mVertexBuffer.put(mVertices); |
| mVertexBuffer.position(0); |
| |
| ByteBuffer ibb = ByteBuffer.allocateDirect(mIndices.length * 2); // Short => 2 bytes |
| ibb.order(ByteOrder.nativeOrder()); |
| mIndexBuffer = ibb.asShortBuffer(); |
| mIndexBuffer.put(mIndices); |
| mIndexBuffer.position(0); |
| |
| ByteBuffer tbb = ByteBuffer.allocateDirect(mTextCoords.length * 4); |
| tbb.order(ByteOrder.nativeOrder()); |
| mTextureBuffer = tbb.asFloatBuffer(); |
| mTextureBuffer.put(mTextCoords); |
| mTextureBuffer.position(0); |
| |
| mFireflies = new Firefly[NUM_FIREFLIES]; |
| for (int i = 0; i < NUM_FIREFLIES; i++) { |
| mFireflies[i] = new Firefly(); |
| } |
| } |
| |
| /** |
| * Starts rendering fireflies on the given surface. |
| * Must be called from the UI-thread. |
| */ |
| public void start(SurfaceTexture surface, int width, int height) { |
| mSurface = surface; |
| mDisplayWidth = width; |
| mDisplayHeight = height; |
| |
| mFireflyRenderThread = new FireflyRenderThread(); |
| mFireflyRenderThread.start(); |
| } |
| |
| /** |
| * Stops rendering fireflies. |
| * Must be called from the UI-thread. |
| */ |
| public void stop() { |
| if (mFireflyRenderThread != null) { |
| mFireflyRenderThread.finish(); |
| try { |
| mFireflyRenderThread.join(); |
| } catch (InterruptedException e) { |
| Log.e(LOG_TAG, "Couldn't wait for FireflyRenderThread."); |
| } |
| mFireflyRenderThread = null; |
| } |
| } |
| |
| private class FireflyRenderThread extends Thread { |
| EGL10 mEgl; |
| EGLDisplay mEglDisplay; |
| EGLConfig mEglConfig; |
| EGLContext mEglContext; |
| EGLSurface mEglSurface; |
| GL10 mGL; |
| |
| // Holding the handle to the texture |
| int mTextureId; |
| |
| // Read/written by multiple threads |
| volatile boolean mFinished; |
| |
| @Override |
| public void run() { |
| if (!initGL()) { |
| Log.e(LOG_TAG, "Failed to initialize OpenGL."); |
| return; |
| } |
| loadStarTexture(); |
| |
| mGL.glClearColor(0.0f, 0.0f, 0.0f, 1.0f); |
| |
| mGL.glViewport(0, 0, mDisplayWidth, mDisplayHeight); |
| |
| // make adjustments for screen ratio |
| mGL.glMatrixMode(GL10.GL_PROJECTION); |
| mGL.glLoadIdentity(); |
| mGL.glFrustumf(-mDisplayWidth, mDisplayWidth, mDisplayHeight, -mDisplayHeight, NEAR_CLIPPING_PLANE, FAR_CLIPPING_PLANE); |
| |
| // Switch back to modelview |
| mGL.glMatrixMode(GL10.GL_MODELVIEW); |
| mGL.glLoadIdentity(); |
| |
| mGL.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST); |
| mGL.glDepthMask(true); |
| |
| |
| for (Firefly firefly : mFireflies) { |
| firefly.reset(); |
| } |
| |
| for (int i = 0; i < 3; i++) { |
| // Call eglSwapBuffers 3 times - this will allocate the necessary |
| // buffers, and make sure the animation looks smooth from the start. |
| if (!mEgl.eglSwapBuffers(mEglDisplay, mEglSurface)) { |
| Log.e(LOG_TAG, "Could not swap buffers"); |
| mFinished = true; |
| } |
| } |
| |
| long startTime = System.currentTimeMillis(); |
| |
| while (!mFinished) { |
| long timeElapsedMs = System.currentTimeMillis() - startTime; |
| startTime = System.currentTimeMillis(); |
| |
| checkCurrent(); |
| |
| mGL.glClear(GL10.GL_COLOR_BUFFER_BIT); |
| mGL.glLoadIdentity(); |
| |
| mGL.glEnable(GL10.GL_TEXTURE_2D); |
| mGL.glEnable(GL10.GL_BLEND); |
| mGL.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE); |
| |
| for (Firefly firefly : mFireflies) { |
| firefly.updatePositionAndScale(timeElapsedMs); |
| firefly.draw(mGL); |
| } |
| |
| if (!mEgl.eglSwapBuffers(mEglDisplay, mEglSurface)) { |
| Log.e(LOG_TAG, "Could not swap buffers"); |
| mFinished = true; |
| } |
| |
| long elapsed = System.currentTimeMillis() - startTime; |
| try { |
| Thread.sleep(Math.max(30 - elapsed, 0)); |
| } catch (InterruptedException e) { |
| |
| } |
| } |
| finishGL(); |
| } |
| |
| public void finish() { |
| mFinished = true; |
| } |
| |
| void loadStarTexture() { |
| int[] textureIds = new int[1]; |
| mGL.glGenTextures(1, textureIds, 0); |
| mTextureId = textureIds[0]; |
| |
| InputStream in = null; |
| try { |
| // Remember that both texture dimensions must be a power of 2! |
| in = mContext.getAssets().open("star.png"); |
| |
| Bitmap bitmap = BitmapFactory.decodeStream(in); |
| mGL.glBindTexture(GL10.GL_TEXTURE_2D, mTextureId); |
| |
| mGL.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR); |
| mGL.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR); |
| |
| GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0); |
| |
| bitmap.recycle(); |
| |
| } catch (IOException e) { |
| Log.e(LOG_TAG, "IOException opening assets."); |
| } finally { |
| if (in != null) { |
| try { |
| in.close(); |
| } catch (IOException e) { } |
| } |
| } |
| } |
| |
| private void checkCurrent() { |
| if (!mEglContext.equals(mEgl.eglGetCurrentContext()) || |
| !mEglSurface.equals(mEgl.eglGetCurrentSurface(EGL10.EGL_DRAW))) { |
| if (!mEgl.eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext)) { |
| throw new RuntimeException("eglMakeCurrent failed " |
| + GLUtils.getEGLErrorString(mEgl.eglGetError())); |
| } |
| } |
| } |
| |
| boolean initGL() { |
| // Initialize openGL engine |
| mEgl = (EGL10) EGLContext.getEGL(); |
| |
| mEglDisplay = mEgl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY); |
| if (mEglDisplay == EGL10.EGL_NO_DISPLAY) { |
| Log.e(LOG_TAG, "eglGetDisplay failed " + |
| GLUtils.getEGLErrorString(mEgl.eglGetError())); |
| return false; |
| } |
| |
| int[] version = new int[2]; |
| if (!mEgl.eglInitialize(mEglDisplay, version)) { |
| Log.e(LOG_TAG, "eglInitialize failed " + |
| GLUtils.getEGLErrorString(mEgl.eglGetError())); |
| return false; |
| } |
| |
| mEglConfig = chooseEglConfig(); |
| if (mEglConfig == null) { |
| Log.e(LOG_TAG, "eglConfig not initialized."); |
| return false; |
| } |
| |
| mEglContext = mEgl.eglCreateContext(mEglDisplay, mEglConfig, EGL10.EGL_NO_CONTEXT, null); |
| |
| mEglSurface = mEgl.eglCreateWindowSurface(mEglDisplay, mEglConfig, mSurface, null); |
| |
| if (mEglSurface == null || mEglSurface == EGL10.EGL_NO_SURFACE) { |
| int error = mEgl.eglGetError(); |
| Log.e(LOG_TAG,"createWindowSurface returned error " + Integer.toString(error)); |
| return false; |
| } |
| |
| if (!mEgl.eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext)) { |
| Log.e(LOG_TAG, "eglMakeCurrent failed " + |
| GLUtils.getEGLErrorString(mEgl.eglGetError())); |
| return false; |
| } |
| |
| mGL = (GL10) mEglContext.getGL(); |
| |
| return true; |
| } |
| |
| private void finishGL() { |
| if (mEgl == null || mEglDisplay == null) { |
| // Nothing to free |
| return; |
| } |
| // Unbind the current surface and context from the display |
| mEgl.eglMakeCurrent(mEglDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, |
| EGL10.EGL_NO_CONTEXT); |
| |
| if (mEglSurface != null) { |
| mEgl.eglDestroySurface(mEglDisplay, mEglSurface); |
| } |
| |
| if (mEglContext != null) { |
| mEgl.eglDestroyContext(mEglDisplay, mEglContext); |
| } |
| } |
| |
| private EGLConfig chooseEglConfig() { |
| int[] configsCount = new int[1]; |
| EGLConfig[] configs = new EGLConfig[1]; |
| if (!mEgl.eglChooseConfig(mEglDisplay, sEglConfig, configs, 1, configsCount)) { |
| throw new IllegalArgumentException("eglChooseConfig failed " + |
| GLUtils.getEGLErrorString(mEgl.eglGetError())); |
| } else if (configsCount[0] > 0) { |
| return configs[0]; |
| } |
| return null; |
| } |
| } |
| |
| private class Firefly { |
| static final float TEXTURE_HEIGHT = 30f; // TODO use measurement of texture size |
| static final float SPEED = .5f; |
| |
| float mX; // between -mDisplayHeight and mDisplayHeight |
| float mY; // between -mDisplayWidth and mDisplayWidth |
| float mZ; // between 0.0 (near) and 1.0 (far) |
| float mZ0; |
| float mT; |
| float mScale; |
| float mAlpha; |
| |
| public Firefly() { |
| } |
| |
| void reset() { |
| mX = (float) (Math.random() * mDisplayWidth) * 4 - 2 * mDisplayWidth; |
| mY = (float) (Math.random() * mDisplayHeight) * 4 - 2 * mDisplayHeight; |
| mZ0 = mZ = (float) (Math.random()) * 2 - 1; |
| mT = 0f; |
| mScale = 1.5f; |
| mAlpha = 0f; |
| } |
| |
| public void updatePositionAndScale(long timeElapsedMs) { |
| mT += timeElapsedMs; |
| mZ = mZ0 + mT/1000f * SPEED; |
| mAlpha = 1f-mZ; |
| if(mZ > 1.0) reset(); |
| } |
| |
| public void draw(GL10 gl) { |
| gl.glLoadIdentity(); |
| |
| // Counter clockwise winding |
| gl.glFrontFace(GL10.GL_CCW); |
| |
| gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); |
| gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY); |
| |
| gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mVertexBuffer); |
| gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, mTextureBuffer); |
| |
| gl.glTranslatef(mX, mY, -NEAR_CLIPPING_PLANE-mZ*(FAR_CLIPPING_PLANE-NEAR_CLIPPING_PLANE)); |
| gl.glColor4f(1, 1, 1, mAlpha); |
| |
| // scale around center |
| gl.glTranslatef(TEXTURE_HEIGHT/2, TEXTURE_HEIGHT/2, 0); |
| gl.glScalef(mScale, mScale, 0); |
| gl.glTranslatef(-TEXTURE_HEIGHT/2, -TEXTURE_HEIGHT/2, 0); |
| |
| gl.glDrawElements(GL10.GL_TRIANGLES, mIndices.length, GL10.GL_UNSIGNED_SHORT, |
| mIndexBuffer); |
| |
| gl.glColor4f(1, 1, 1, 1); |
| gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY); |
| gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); |
| } |
| } |
| } |
