michael@0: /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: package org.mozilla.gecko.gfx;
michael@0: 
michael@0: import android.opengl.GLES20;
michael@0: import android.util.Log;
michael@0: 
michael@0: import java.util.concurrent.ArrayBlockingQueue;
michael@0: 
michael@0: import javax.microedition.khronos.egl.EGL10;
michael@0: import javax.microedition.khronos.egl.EGLContext;
michael@0: 
michael@0: public class TextureGenerator {
michael@0:     private static final String LOGTAG = "TextureGenerator";
michael@0:     private static final int POOL_SIZE = 5;
michael@0: 
michael@0:     private static TextureGenerator sSharedInstance;
michael@0: 
michael@0:     private ArrayBlockingQueue<Integer> mTextureIds;
michael@0:     private EGLContext mContext;
michael@0: 
michael@0:     private TextureGenerator() { mTextureIds = new ArrayBlockingQueue<Integer>(POOL_SIZE); }
michael@0: 
michael@0:     public static TextureGenerator get() {
michael@0:         if (sSharedInstance == null)
michael@0:             sSharedInstance = new TextureGenerator();
michael@0:         return sSharedInstance;
michael@0:     }
michael@0: 
michael@0:     public synchronized int take() {
michael@0:         try {
michael@0:             // Will block until one becomes available
michael@0:             return (int)mTextureIds.take();
michael@0:         } catch (InterruptedException e) {
michael@0:             return 0;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     public synchronized void fill() {
michael@0:         EGL10 egl = (EGL10)EGLContext.getEGL();
michael@0:         EGLContext context = egl.eglGetCurrentContext();
michael@0: 
michael@0:         if (mContext != null && mContext != context) {
michael@0:             mTextureIds.clear();
michael@0:         }
michael@0: 
michael@0:         mContext = context;
michael@0: 
michael@0:         int numNeeded = mTextureIds.remainingCapacity();
michael@0:         if (numNeeded == 0)
michael@0:             return;
michael@0: 
michael@0:         // Clear existing GL errors
michael@0:         int error;
michael@0:         while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
michael@0:             Log.w(LOGTAG, String.format("Clearing GL error: %#x", error));
michael@0:         }
michael@0: 
michael@0:         int[] textures = new int[numNeeded];
michael@0:         GLES20.glGenTextures(numNeeded, textures, 0);
michael@0: 
michael@0:         error = GLES20.glGetError();
michael@0:         if (error != GLES20.GL_NO_ERROR) {
michael@0:             Log.e(LOGTAG, String.format("Failed to generate textures: %#x", error), new Exception());
michael@0:             return;
michael@0:         }
michael@0:         
michael@0:         for (int i = 0; i < numNeeded; i++) {
michael@0:             mTextureIds.offer(textures[i]);
michael@0:         }
michael@0:     }
michael@0: }
michael@0: 
michael@0: