android/source/src/java/org/mozilla/gecko/gfx/GLController.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 javax.microedition.khronos.egl.EGL10;
   9 import javax.microedition.khronos.egl.EGLConfig;
  10 import javax.microedition.khronos.egl.EGLContext;
  11 import javax.microedition.khronos.egl.EGLDisplay;
  12 import javax.microedition.khronos.egl.EGLSurface;
  13 import javax.microedition.khronos.opengles.GL10;
  14
  15 public class GLController {
  16     private static final int EGL_CONTEXT_CLIENT_VERSION = 0x3098;
  17     private static final String LOGTAG = "GeckoGLController";
  18
  19     private LayerView mView;
  20     private int mGLVersion;
  21     private int mWidth, mHeight;
  22
  23     private EGL10 mEGL;
  24     private EGLDisplay mEGLDisplay;
  25     private EGLConfig mEGLConfig;
  26     private EGLContext mEGLContext;
  27     private EGLSurface mEGLSurface;
  28
  29     private static final int LOCAL_EGL_OPENGL_ES2_BIT = 4;
  30
  31     private static final int[] CONFIG_SPEC = {
  32         EGL10.EGL_RED_SIZE, 5,
  33         EGL10.EGL_GREEN_SIZE, 6,
  34         EGL10.EGL_BLUE_SIZE, 5,
  35         EGL10.EGL_SURFACE_TYPE, EGL10.EGL_WINDOW_BIT,
  36         EGL10.EGL_RENDERABLE_TYPE, LOCAL_EGL_OPENGL_ES2_BIT,
  37         EGL10.EGL_NONE
  38     };
  39
  40     public GLController(LayerView view) {
  41         mView = view;
  42         mGLVersion = 2;
  43     }
  44
  45     public void setGLVersion(int version) {
  46         mGLVersion = version;
  47     }
  48
  49     /** You must call this on the same thread you intend to use OpenGL on. */
  50     public void initGLContext() {
  51         initEGLContext();
  52         createEGLSurface();
  53     }
  54
  55     public void disposeGLContext() {
  56         if (mEGL == null) {
  57             return;
  58         }
  59
  60         if (!mEGL.eglMakeCurrent(mEGLDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE,
  61                                  EGL10.EGL_NO_CONTEXT)) {
  62             throw new GLControllerException("EGL context could not be released! " +
  63                                             getEGLError());
  64         }
  65
  66         if (mEGLSurface != null) {
  67             if (!mEGL.eglDestroySurface(mEGLDisplay, mEGLSurface)) {
  68                 throw new GLControllerException("EGL surface could not be destroyed! " +
  69                                                 getEGLError());
  70             }
  71
  72             mEGLSurface = null;
  73         }
  74
  75         if (mEGLContext != null) {
  76             if (!mEGL.eglDestroyContext(mEGLDisplay, mEGLContext)) {
  77                 throw new GLControllerException("EGL context could not be destroyed! " +
  78                                                 getEGLError());
  79             }
  80
  81             mEGLContext = null;
  82         }
  83     }
  84
  85     public GL10 getGL() { return (GL10) mEGLContext.getGL(); }
  86     public EGLDisplay getEGLDisplay()       { return mEGLDisplay;         }
  87     public EGLConfig getEGLConfig()         { return mEGLConfig;          }
  88     public EGLContext getEGLContext()       { return mEGLContext;         }
  89     public EGLSurface getEGLSurface()       { return mEGLSurface;         }
  90     public LayerView getView()              { return mView;               }
  91
  92     public boolean hasSurface() {
  93         return mEGLSurface != null;
  94     }
  95
  96     public boolean swapBuffers() {
  97         return mEGL.eglSwapBuffers(mEGLDisplay, mEGLSurface);
  98     }
  99
 100     public synchronized int getWidth() {
 101         return mWidth;
 102     }
 103
 104     public synchronized int getHeight() {
 105         return mHeight;
 106     }
 107
 108     synchronized void surfaceDestroyed() {
 109         notifyAll();
 110     }
 111
 112     synchronized void surfaceChanged(int newWidth, int newHeight) {
 113         mWidth = newWidth;
 114         mHeight = newHeight;
 115         notifyAll();
 116     }
 117
 118     private void initEGL() {
 119         mEGL = (EGL10)EGLContext.getEGL();
 120
 121         mEGLDisplay = mEGL.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
 122         if (mEGLDisplay == EGL10.EGL_NO_DISPLAY) {
 123             throw new GLControllerException("eglGetDisplay() failed");
 124         }
 125
 126         int[] version = new int[2];
 127         if (!mEGL.eglInitialize(mEGLDisplay, version)) {
 128             throw new GLControllerException("eglInitialize() failed " + getEGLError());
 129         }
 130
 131         mEGLConfig = chooseConfig();
 132     }
 133
 134     private void initEGLContext() {
 135         initEGL();
 136
 137         int[] attribList = { EGL_CONTEXT_CLIENT_VERSION, mGLVersion, EGL10.EGL_NONE };
 138         mEGLContext = mEGL.eglCreateContext(mEGLDisplay, mEGLConfig, EGL10.EGL_NO_CONTEXT,
 139                                             attribList);
 140         if (mEGLContext == null || mEGLContext == EGL10.EGL_NO_CONTEXT) {
 141             throw new GLControllerException("createContext() failed " +
 142                                             getEGLError());
 143         }
 144
 145         if (mView.getRenderer() != null) {
 146             GL10 gl = (GL10) mEGLContext.getGL();
 147             mView.getRenderer().onSurfaceCreated(gl, mEGLConfig);
 148             mView.getRenderer().onSurfaceChanged(gl, mWidth, mHeight);
 149         }
 150     }
 151
 152     private EGLConfig chooseConfig() {
 153         int[] numConfigs = new int[1];
 154         if (!mEGL.eglChooseConfig(mEGLDisplay, CONFIG_SPEC, null, 0, numConfigs) ||
 155                 numConfigs[0] <= 0) {
 156             throw new GLControllerException("No available EGL configurations " +
 157                                             getEGLError());
 158         }
 159
 160         EGLConfig[] configs = new EGLConfig[numConfigs[0]];
 161         if (!mEGL.eglChooseConfig(mEGLDisplay, CONFIG_SPEC, configs, numConfigs[0], numConfigs)) {
 162             throw new GLControllerException("No EGL configuration for that specification " +
 163                                             getEGLError());
 164         }
 165
 166         // Select the first 565 RGB configuration.
 167         int[] red = new int[1], green = new int[1], blue = new int[1];
 168         for (EGLConfig config : configs) {
 169             mEGL.eglGetConfigAttrib(mEGLDisplay, config, EGL10.EGL_RED_SIZE, red);
 170             mEGL.eglGetConfigAttrib(mEGLDisplay, config, EGL10.EGL_GREEN_SIZE, green);
 171             mEGL.eglGetConfigAttrib(mEGLDisplay, config, EGL10.EGL_BLUE_SIZE, blue);
 172             if (red[0] == 5 && green[0] == 6 && blue[0] == 5) {
 173                 return config;
 174             }
 175         }
 176
 177         // if there's no 565 RGB configuration, select another one that fulfils the specification
 178         return configs[0];
 179     }
 180
 181     private void createEGLSurface() {
 182         Object window = mView.getNativeWindow();
 183         mEGLSurface = mEGL.eglCreateWindowSurface(mEGLDisplay, mEGLConfig, window, null);
 184         if (mEGLSurface == null || mEGLSurface == EGL10.EGL_NO_SURFACE) {
 185             throw new GLControllerException("EGL window surface could not be created! " +
 186                                             getEGLError());
 187         }
 188
 189         if (!mEGL.eglMakeCurrent(mEGLDisplay, mEGLSurface, mEGLSurface, mEGLContext)) {
 190             throw new GLControllerException("EGL surface could not be made into the current " +
 191                                             "surface! " + getEGLError());
 192         }
 193
 194         if (mView.getRenderer() != null) {
 195             GL10 gl = (GL10) mEGLContext.getGL();
 196             mView.getRenderer().onSurfaceCreated(gl, mEGLConfig);
 197             mView.getRenderer().onSurfaceChanged(gl, mView.getWidth(), mView.getHeight());
 198         }
 199     }
 200
 201     private String getEGLError() {
 202         return "Error " + mEGL.eglGetError();
 203     }
 204
 205     public static class GLControllerException extends RuntimeException {
 206         public static final long serialVersionUID = 1L;
 207
 208         GLControllerException(String e) {
 209             super(e);
 210         }
 211     }
 212 }
 213