android/source/src/java/org/mozilla/gecko/gfx/TextureGenerator.java

   1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 package org.mozilla.gecko.gfx;
   7
   8 import android.opengl.GLES20;
   9 import android.util.Log;
  10
  11 import java.util.concurrent.ArrayBlockingQueue;
  12
  13 import javax.microedition.khronos.egl.EGL10;
  14 import javax.microedition.khronos.egl.EGLContext;
  15
  16 public class TextureGenerator {
  17     private static final String LOGTAG = "TextureGenerator";
  18     private static final int POOL_SIZE = 5;
  19
  20     private static TextureGenerator sSharedInstance;
  21
  22     private ArrayBlockingQueue<Integer> mTextureIds;
  23     private EGLContext mContext;
  24
  25     private TextureGenerator() {
  26         mTextureIds = new ArrayBlockingQueue<Integer>(POOL_SIZE);
  27     }
  28
  29     public static TextureGenerator get() {
  30         if (sSharedInstance == null)
  31             sSharedInstance = new TextureGenerator();
  32         return sSharedInstance;
  33     }
  34
  35     public synchronized int take() {
  36         try {
  37             // Will block until one becomes available
  38             return mTextureIds.take();
  39         } catch (InterruptedException e) {
  40             return 0;
  41         }
  42     }
  43
  44     public synchronized void fill() {
  45         EGL10 egl = (EGL10) EGLContext.getEGL();
  46         EGLContext context = egl.eglGetCurrentContext();
  47
  48         if (mContext != null && mContext != context) {
  49             mTextureIds.clear();
  50         }
  51
  52         mContext = context;
  53
  54         int numNeeded = mTextureIds.remainingCapacity();
  55         if (numNeeded == 0)
  56             return;
  57
  58         // Clear existing GL errors
  59         int error;
  60         while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
  61             Log.w(LOGTAG, String.format("Clearing GL error: %#x", error));
  62         }
  63
  64         int[] textures = new int[numNeeded];
  65         GLES20.glGenTextures(numNeeded, textures, 0);
  66
  67         error = GLES20.glGetError();
  68         if (error != GLES20.GL_NO_ERROR) {
  69             Log.e(LOGTAG, String.format("Failed to generate textures: %#x", error), new Exception());
  70             return;
  71         }
  72
  73         for (int i = 0; i < numNeeded; i++) {
  74             mTextureIds.offer(textures[i]);
  75         }
  76     }
  77 }