GLSurfaceView.java revision 82cbaab450d3c5d9f3d52c49881212f250d7cd97
1/* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.opengl; 18 19import java.io.Writer; 20import java.util.ArrayList; 21import java.util.concurrent.Semaphore; 22 23import javax.microedition.khronos.egl.EGL10; 24import javax.microedition.khronos.egl.EGL11; 25import javax.microedition.khronos.egl.EGLConfig; 26import javax.microedition.khronos.egl.EGLContext; 27import javax.microedition.khronos.egl.EGLDisplay; 28import javax.microedition.khronos.egl.EGLSurface; 29import javax.microedition.khronos.opengles.GL; 30import javax.microedition.khronos.opengles.GL10; 31 32import android.content.Context; 33import android.util.AttributeSet; 34import android.util.Log; 35import android.view.SurfaceHolder; 36import android.view.SurfaceView; 37 38/** 39 * An implementation of SurfaceView that uses the dedicated surface for 40 * displaying OpenGL rendering. 41 * <p> 42 * A GLSurfaceView provides the following features: 43 * <p> 44 * <ul> 45 * <li>Manages a surface, which is a special piece of memory that can be 46 * composited into the Android view system. 47 * <li>Manages an EGL display, which enables OpenGL to render into a surface. 48 * <li>Accepts a user-provided Renderer object that does the actual rendering. 49 * <li>Renders on a dedicated thread to decouple rendering performance from the 50 * UI thread. 51 * <li>Supports both on-demand and continuous rendering. 52 * <li>Optionally wraps, traces, and/or error-checks the renderer's OpenGL calls. 53 * </ul> 54 * 55 * <h3>Using GLSurfaceView</h3> 56 * <p> 57 * Typically you use GLSurfaceView by subclassing it and overriding one or more of the 58 * View system input event methods. If your application does not need to override event 59 * methods then GLSurfaceView can be used as-is. For the most part 60 * GLSurfaceView behavior is customized by calling "set" methods rather than by subclassing. 61 * For example, unlike a regular View, drawing is delegated to a separate Renderer object which 62 * is registered with the GLSurfaceView 63 * using the {@link #setRenderer(Renderer)} call. 64 * <p> 65 * <h3>Initializing GLSurfaceView</h3> 66 * All you have to do to initialize a GLSurfaceView is call {@link #setRenderer(Renderer)}. 67 * However, if desired, you can modify the default behavior of GLSurfaceView by calling one or 68 * more of these methods before calling setRenderer: 69 * <ul> 70 * <li>{@link #setDebugFlags(int)} 71 * <li>{@link #setEGLConfigChooser(boolean)} 72 * <li>{@link #setEGLConfigChooser(EGLConfigChooser)} 73 * <li>{@link #setEGLConfigChooser(int, int, int, int, int, int)} 74 * <li>{@link #setGLWrapper(GLWrapper)} 75 * </ul> 76 * <p> 77 * <h4>Choosing an EGL Configuration</h4> 78 * A given Android device may support multiple possible types of drawing surfaces. 79 * The available surfaces may differ in how may channels of data are present, as 80 * well as how many bits are allocated to each channel. Therefore, the first thing 81 * GLSurfaceView has to do when starting to render is choose what type of surface to use. 82 * <p> 83 * By default GLSurfaceView chooses an available surface that's closest to a 16-bit R5G6B5 surface 84 * with a 16-bit depth buffer and no stencil. If you would prefer a different surface (for example, 85 * if you do not need a depth buffer) you can override the default behavior by calling one of the 86 * setEGLConfigChooser methods. 87 * <p> 88 * <h4>Debug Behavior</h4> 89 * You can optionally modify the behavior of GLSurfaceView by calling 90 * one or more of the debugging methods {@link #setDebugFlags(int)}, 91 * and {@link #setGLWrapper}. These methods may be called before and/or after setRenderer, but 92 * typically they are called before setRenderer so that they take effect immediately. 93 * <p> 94 * <h4>Setting a Renderer</h4> 95 * Finally, you must call {@link #setRenderer} to register a {@link Renderer}. 96 * The renderer is 97 * responsible for doing the actual OpenGL rendering. 98 * <p> 99 * <h3>Rendering Mode</h3> 100 * Once the renderer is set, you can control whether the renderer draws 101 * continuously or on-demand by calling 102 * {@link #setRenderMode}. The default is continuous rendering. 103 * <p> 104 * <h3>Activity Life-cycle</h3> 105 * A GLSurfaceView must be notified when the activity is paused and resumed. GLSurfaceView clients 106 * are required to call {@link #onPause()} when the activity pauses and 107 * {@link #onResume()} when the activity resumes. These calls allow GLSurfaceView to 108 * pause and resume the rendering thread, and also allow GLSurfaceView to release and recreate 109 * the OpenGL display. 110 * <p> 111 * <h3>Handling events</h3> 112 * <p> 113 * To handle an event you will typically subclass GLSurfaceView and override the 114 * appropriate method, just as you would with any other View. However, when handling 115 * the event, you may need to communicate with the Renderer object 116 * that's running in the rendering thread. You can do this using any 117 * standard Java cross-thread communication mechanism. In addition, 118 * one relatively easy way to communicate with your renderer is 119 * to call 120 * {@link #queueEvent(Runnable)}. For example: 121 * <pre class="prettyprint"> 122 * class MyGLSurfaceView extends GLSurfaceView { 123 * 124 * private MyRenderer mMyRenderer; 125 * 126 * public void start() { 127 * mMyRenderer = ...; 128 * setRenderer(mMyRenderer); 129 * } 130 * 131 * public boolean onKeyDown(int keyCode, KeyEvent event) { 132 * if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) { 133 * queueEvent(new Runnable() { 134 * // This method will be called on the rendering 135 * // thread: 136 * public void run() { 137 * mMyRenderer.handleDpadCenter(); 138 * }}); 139 * return true; 140 * } 141 * return super.onKeyDown(keyCode, event); 142 * } 143 * } 144 * </pre> 145 * 146 */ 147public class GLSurfaceView extends SurfaceView implements SurfaceHolder.Callback { 148 /** 149 * The renderer only renders 150 * when the surface is created, or when {@link #requestRender} is called. 151 * 152 * @see #getRenderMode() 153 * @see #setRenderMode(int) 154 */ 155 public final static int RENDERMODE_WHEN_DIRTY = 0; 156 /** 157 * The renderer is called 158 * continuously to re-render the scene. 159 * 160 * @see #getRenderMode() 161 * @see #setRenderMode(int) 162 * @see #requestRender() 163 */ 164 public final static int RENDERMODE_CONTINUOUSLY = 1; 165 166 /** 167 * Check glError() after every GL call and throw an exception if glError indicates 168 * that an error has occurred. This can be used to help track down which OpenGL ES call 169 * is causing an error. 170 * 171 * @see #getDebugFlags 172 * @see #setDebugFlags 173 */ 174 public final static int DEBUG_CHECK_GL_ERROR = 1; 175 176 /** 177 * Log GL calls to the system log at "verbose" level with tag "GLSurfaceView". 178 * 179 * @see #getDebugFlags 180 * @see #setDebugFlags 181 */ 182 public final static int DEBUG_LOG_GL_CALLS = 2; 183 184 /** 185 * Standard View constructor. In order to render something, you 186 * must call {@link #setRenderer} to register a renderer. 187 */ 188 public GLSurfaceView(Context context) { 189 super(context); 190 init(); 191 } 192 193 /** 194 * Standard View constructor. In order to render something, you 195 * must call {@link #setRenderer} to register a renderer. 196 */ 197 public GLSurfaceView(Context context, AttributeSet attrs) { 198 super(context, attrs); 199 init(); 200 } 201 202 private void init() { 203 // Install a SurfaceHolder.Callback so we get notified when the 204 // underlying surface is created and destroyed 205 SurfaceHolder holder = getHolder(); 206 holder.addCallback(this); 207 } 208 209 /** 210 * Set the glWrapper. If the glWrapper is not null, its 211 * {@link GLWrapper#wrap(GL)} method is called 212 * whenever a surface is created. A GLWrapper can be used to wrap 213 * the GL object that's passed to the renderer. Wrapping a GL 214 * object enables examining and modifying the behavior of the 215 * GL calls made by the renderer. 216 * <p> 217 * Wrapping is typically used for debugging purposes. 218 * <p> 219 * The default value is null. 220 * @param glWrapper the new GLWrapper 221 */ 222 public void setGLWrapper(GLWrapper glWrapper) { 223 mGLWrapper = glWrapper; 224 } 225 226 /** 227 * Set the debug flags to a new value. The value is 228 * constructed by OR-together zero or more 229 * of the DEBUG_CHECK_* constants. The debug flags take effect 230 * whenever a surface is created. The default value is zero. 231 * @param debugFlags the new debug flags 232 * @see #DEBUG_CHECK_GL_ERROR 233 * @see #DEBUG_LOG_GL_CALLS 234 */ 235 public void setDebugFlags(int debugFlags) { 236 mDebugFlags = debugFlags; 237 } 238 239 /** 240 * Get the current value of the debug flags. 241 * @return the current value of the debug flags. 242 */ 243 public int getDebugFlags() { 244 return mDebugFlags; 245 } 246 247 /** 248 * Set the renderer associated with this view. Also starts the thread that 249 * will call the renderer, which in turn causes the rendering to start. 250 * <p>This method should be called once and only once in the life-cycle of 251 * a GLSurfaceView. 252 * <p>The following GLSurfaceView methods can only be called <em>before</em> 253 * setRenderer is called: 254 * <ul> 255 * <li>{@link #setEGLConfigChooser(boolean)} 256 * <li>{@link #setEGLConfigChooser(EGLConfigChooser)} 257 * <li>{@link #setEGLConfigChooser(int, int, int, int, int, int)} 258 * </ul> 259 * <p> 260 * The following GLSurfaceView methods can only be called <em>after</em> 261 * setRenderer is called: 262 * <ul> 263 * <li>{@link #getRenderMode()} 264 * <li>{@link #onPause()} 265 * <li>{@link #onResume()} 266 * <li>{@link #queueEvent(Runnable)} 267 * <li>{@link #requestRender()} 268 * <li>{@link #setRenderMode(int)} 269 * </ul> 270 * 271 * @param renderer the renderer to use to perform OpenGL drawing. 272 */ 273 public void setRenderer(Renderer renderer) { 274 checkRenderThreadState(); 275 if (mEGLConfigChooser == null) { 276 mEGLConfigChooser = new SimpleEGLConfigChooser(true); 277 } 278 if (mEGLContextFactory == null) { 279 mEGLContextFactory = new DefaultContextFactory(); 280 } 281 if (mEGLWindowSurfaceFactory == null) { 282 mEGLWindowSurfaceFactory = new DefaultWindowSurfaceFactory(); 283 } 284 mGLThread = new GLThread(renderer); 285 mGLThread.start(); 286 } 287 288 /** 289 * Install a custom EGLContextFactory. 290 * <p>If this method is 291 * called, it must be called before {@link #setRenderer(Renderer)} 292 * is called. 293 * <p> 294 * If this method is not called, then by default 295 * a context will be created with no shared context and 296 * with a null attribute list. 297 */ 298 public void setEGLContextFactory(EGLContextFactory factory) { 299 checkRenderThreadState(); 300 mEGLContextFactory = factory; 301 } 302 303 /** 304 * Install a custom EGLWindowSurfaceFactory. 305 * <p>If this method is 306 * called, it must be called before {@link #setRenderer(Renderer)} 307 * is called. 308 * <p> 309 * If this method is not called, then by default 310 * a window surface will be created with a null attribute list. 311 */ 312 public void setEGLWindowSurfaceFactory(EGLWindowSurfaceFactory factory) { 313 checkRenderThreadState(); 314 mEGLWindowSurfaceFactory = factory; 315 } 316 317 /** 318 * Install a custom EGLConfigChooser. 319 * <p>If this method is 320 * called, it must be called before {@link #setRenderer(Renderer)} 321 * is called. 322 * <p> 323 * If no setEGLConfigChooser method is called, then by default the 324 * view will choose a config as close to 16-bit RGB as possible, with 325 * a depth buffer as close to 16 bits as possible. 326 * @param configChooser 327 */ 328 public void setEGLConfigChooser(EGLConfigChooser configChooser) { 329 checkRenderThreadState(); 330 mEGLConfigChooser = configChooser; 331 } 332 333 /** 334 * Install a config chooser which will choose a config 335 * as close to 16-bit RGB as possible, with or without an optional depth 336 * buffer as close to 16-bits as possible. 337 * <p>If this method is 338 * called, it must be called before {@link #setRenderer(Renderer)} 339 * is called. 340 * <p> 341 * If no setEGLConfigChooser method is called, then by default the 342 * view will choose a config as close to 16-bit RGB as possible, with 343 * a depth buffer as close to 16 bits as possible. 344 * 345 * @param needDepth 346 */ 347 public void setEGLConfigChooser(boolean needDepth) { 348 setEGLConfigChooser(new SimpleEGLConfigChooser(needDepth)); 349 } 350 351 /** 352 * Install a config chooser which will choose a config 353 * with at least the specified component sizes, and as close 354 * to the specified component sizes as possible. 355 * <p>If this method is 356 * called, it must be called before {@link #setRenderer(Renderer)} 357 * is called. 358 * <p> 359 * If no setEGLConfigChooser method is called, then by default the 360 * view will choose a config as close to 16-bit RGB as possible, with 361 * a depth buffer as close to 16 bits as possible. 362 * 363 */ 364 public void setEGLConfigChooser(int redSize, int greenSize, int blueSize, 365 int alphaSize, int depthSize, int stencilSize) { 366 setEGLConfigChooser(new ComponentSizeChooser(redSize, greenSize, 367 blueSize, alphaSize, depthSize, stencilSize)); 368 } 369 /** 370 * Set the rendering mode. When renderMode is 371 * RENDERMODE_CONTINUOUSLY, the renderer is called 372 * repeatedly to re-render the scene. When renderMode 373 * is RENDERMODE_WHEN_DIRTY, the renderer only rendered when the surface 374 * is created, or when {@link #requestRender} is called. Defaults to RENDERMODE_CONTINUOUSLY. 375 * <p> 376 * Using RENDERMODE_WHEN_DIRTY can improve battery life and overall system performance 377 * by allowing the GPU and CPU to idle when the view does not need to be updated. 378 * <p> 379 * This method can only be called after {@link #setRenderer(Renderer)} 380 * 381 * @param renderMode one of the RENDERMODE_X constants 382 * @see #RENDERMODE_CONTINUOUSLY 383 * @see #RENDERMODE_WHEN_DIRTY 384 */ 385 public void setRenderMode(int renderMode) { 386 mGLThread.setRenderMode(renderMode); 387 } 388 389 /** 390 * Get the current rendering mode. May be called 391 * from any thread. Must not be called before a renderer has been set. 392 * @return the current rendering mode. 393 * @see #RENDERMODE_CONTINUOUSLY 394 * @see #RENDERMODE_WHEN_DIRTY 395 */ 396 public int getRenderMode() { 397 return mGLThread.getRenderMode(); 398 } 399 400 /** 401 * Request that the renderer render a frame. 402 * This method is typically used when the render mode has been set to 403 * {@link #RENDERMODE_WHEN_DIRTY}, so that frames are only rendered on demand. 404 * May be called 405 * from any thread. Must not be called before a renderer has been set. 406 */ 407 public void requestRender() { 408 mGLThread.requestRender(); 409 } 410 411 /** 412 * This method is part of the SurfaceHolder.Callback interface, and is 413 * not normally called or subclassed by clients of GLSurfaceView. 414 */ 415 public void surfaceCreated(SurfaceHolder holder) { 416 mGLThread.surfaceCreated(); 417 } 418 419 /** 420 * This method is part of the SurfaceHolder.Callback interface, and is 421 * not normally called or subclassed by clients of GLSurfaceView. 422 */ 423 public void surfaceDestroyed(SurfaceHolder holder) { 424 // Surface will be destroyed when we return 425 mGLThread.surfaceDestroyed(); 426 } 427 428 /** 429 * This method is part of the SurfaceHolder.Callback interface, and is 430 * not normally called or subclassed by clients of GLSurfaceView. 431 */ 432 public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { 433 mGLThread.onWindowResize(w, h); 434 } 435 436 /** 437 * Inform the view that the activity is paused. The owner of this view must 438 * call this method when the activity is paused. Calling this method will 439 * pause the rendering thread. 440 * Must not be called before a renderer has been set. 441 */ 442 public void onPause() { 443 mGLThread.onPause(); 444 } 445 446 /** 447 * Inform the view that the activity is resumed. The owner of this view must 448 * call this method when the activity is resumed. Calling this method will 449 * recreate the OpenGL display and resume the rendering 450 * thread. 451 * Must not be called before a renderer has been set. 452 */ 453 public void onResume() { 454 mGLThread.onResume(); 455 } 456 457 /** 458 * Queue a runnable to be run on the GL rendering thread. This can be used 459 * to communicate with the Renderer on the rendering thread. 460 * Must not be called before a renderer has been set. 461 * @param r the runnable to be run on the GL rendering thread. 462 */ 463 public void queueEvent(Runnable r) { 464 mGLThread.queueEvent(r); 465 } 466 467 /** 468 * This method is used as part of the View class and is not normally 469 * called or subclassed by clients of GLSurfaceView. 470 * Must not be called before a renderer has been set. 471 */ 472 @Override 473 protected void onDetachedFromWindow() { 474 super.onDetachedFromWindow(); 475 mGLThread.requestExitAndWait(); 476 } 477 478 // ---------------------------------------------------------------------- 479 480 /** 481 * An interface used to wrap a GL interface. 482 * <p>Typically 483 * used for implementing debugging and tracing on top of the default 484 * GL interface. You would typically use this by creating your own class 485 * that implemented all the GL methods by delegating to another GL instance. 486 * Then you could add your own behavior before or after calling the 487 * delegate. All the GLWrapper would do was instantiate and return the 488 * wrapper GL instance: 489 * <pre class="prettyprint"> 490 * class MyGLWrapper implements GLWrapper { 491 * GL wrap(GL gl) { 492 * return new MyGLImplementation(gl); 493 * } 494 * static class MyGLImplementation implements GL,GL10,GL11,... { 495 * ... 496 * } 497 * } 498 * </pre> 499 * @see #setGLWrapper(GLWrapper) 500 */ 501 public interface GLWrapper { 502 /** 503 * Wraps a gl interface in another gl interface. 504 * @param gl a GL interface that is to be wrapped. 505 * @return either the input argument or another GL object that wraps the input argument. 506 */ 507 GL wrap(GL gl); 508 } 509 510 /** 511 * A generic renderer interface. 512 * <p> 513 * The renderer is responsible for making OpenGL calls to render a frame. 514 * <p> 515 * GLSurfaceView clients typically create their own classes that implement 516 * this interface, and then call {@link GLSurfaceView#setRenderer} to 517 * register the renderer with the GLSurfaceView. 518 * <p> 519 * <h3>Threading</h3> 520 * The renderer will be called on a separate thread, so that rendering 521 * performance is decoupled from the UI thread. Clients typically need to 522 * communicate with the renderer from the UI thread, because that's where 523 * input events are received. Clients can communicate using any of the 524 * standard Java techniques for cross-thread communication, or they can 525 * use the {@link GLSurfaceView#queueEvent(Runnable)} convenience method. 526 * <p> 527 * <h3>EGL Context Lost</h3> 528 * There are situations where the EGL rendering context will be lost. This 529 * typically happens when device wakes up after going to sleep. When 530 * the EGL context is lost, all OpenGL resources (such as textures) that are 531 * associated with that context will be automatically deleted. In order to 532 * keep rendering correctly, a renderer must recreate any lost resources 533 * that it still needs. The {@link #onSurfaceCreated(GL10, EGLConfig)} method 534 * is a convenient place to do this. 535 * 536 * 537 * @see #setRenderer(Renderer) 538 */ 539 public interface Renderer { 540 /** 541 * Called when the surface is created or recreated. 542 * <p> 543 * Called when the rendering thread 544 * starts and whenever the EGL context is lost. The context will typically 545 * be lost when the Android device awakes after going to sleep. 546 * <p> 547 * Since this method is called at the beginning of rendering, as well as 548 * every time the EGL context is lost, this method is a convenient place to put 549 * code to create resources that need to be created when the rendering 550 * starts, and that need to be recreated when the EGL context is lost. 551 * Textures are an example of a resource that you might want to create 552 * here. 553 * <p> 554 * Note that when the EGL context is lost, all OpenGL resources associated 555 * with that context will be automatically deleted. You do not need to call 556 * the corresponding "glDelete" methods such as glDeleteTextures to 557 * manually delete these lost resources. 558 * <p> 559 * @param gl the GL interface. Use <code>instanceof</code> to 560 * test if the interface supports GL11 or higher interfaces. 561 * @param config the EGLConfig of the created surface. Can be used 562 * to create matching pbuffers. 563 */ 564 void onSurfaceCreated(GL10 gl, EGLConfig config); 565 566 /** 567 * Called when the surface changed size. 568 * <p> 569 * Called after the surface is created and whenever 570 * the OpenGL ES surface size changes. 571 * <p> 572 * Typically you will set your viewport here. If your camera 573 * is fixed then you could also set your projection matrix here: 574 * <pre class="prettyprint"> 575 * void onSurfaceChanged(GL10 gl, int width, int height) { 576 * gl.glViewport(0, 0, width, height); 577 * // for a fixed camera, set the projection too 578 * float ratio = (float) width / height; 579 * gl.glMatrixMode(GL10.GL_PROJECTION); 580 * gl.glLoadIdentity(); 581 * gl.glFrustumf(-ratio, ratio, -1, 1, 1, 10); 582 * } 583 * </pre> 584 * @param gl the GL interface. Use <code>instanceof</code> to 585 * test if the interface supports GL11 or higher interfaces. 586 * @param width 587 * @param height 588 */ 589 void onSurfaceChanged(GL10 gl, int width, int height); 590 591 /** 592 * Called to draw the current frame. 593 * <p> 594 * This method is responsible for drawing the current frame. 595 * <p> 596 * The implementation of this method typically looks like this: 597 * <pre class="prettyprint"> 598 * void onDrawFrame(GL10 gl) { 599 * gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); 600 * //... other gl calls to render the scene ... 601 * } 602 * </pre> 603 * @param gl the GL interface. Use <code>instanceof</code> to 604 * test if the interface supports GL11 or higher interfaces. 605 */ 606 void onDrawFrame(GL10 gl); 607 } 608 609 /** 610 * An interface for customizing the eglCreateContext and eglDestroyContext calls. 611 * <p> 612 * This interface must be implemented by clients wishing to call 613 * {@link GLSurfaceView#setEGLContextFactory(EGLContextFactory)} 614 */ 615 public interface EGLContextFactory { 616 EGLContext createContext(EGL10 egl, EGLDisplay display, EGLConfig eglConfig); 617 void destroyContext(EGL10 egl, EGLDisplay display, EGLContext context); 618 } 619 620 private static class DefaultContextFactory implements EGLContextFactory { 621 622 public EGLContext createContext(EGL10 egl, EGLDisplay display, EGLConfig config) { 623 return egl.eglCreateContext(display, config, EGL10.EGL_NO_CONTEXT, null); 624 } 625 626 public void destroyContext(EGL10 egl, EGLDisplay display, 627 EGLContext context) { 628 egl.eglDestroyContext(display, context); 629 } 630 } 631 632 /** 633 * An interface for customizing the eglCreateWindowSurface and eglDestroySurface calls. 634 * <p> 635 * This interface must be implemented by clients wishing to call 636 * {@link GLSurfaceView#setEGLContextCreator(EGLContextCreator)} 637 */ 638 public interface EGLWindowSurfaceFactory { 639 EGLSurface createWindowSurface(EGL10 egl, EGLDisplay display, EGLConfig config, 640 Object nativeWindow); 641 void destroySurface(EGL10 egl, EGLDisplay display, EGLSurface surface); 642 } 643 644 private static class DefaultWindowSurfaceFactory implements EGLWindowSurfaceFactory { 645 646 public EGLSurface createWindowSurface(EGL10 egl, EGLDisplay display, 647 EGLConfig config, Object nativeWindow) { 648 return egl.eglCreateWindowSurface(display, config, nativeWindow, null); 649 } 650 651 public void destroySurface(EGL10 egl, EGLDisplay display, 652 EGLSurface surface) { 653 egl.eglDestroySurface(display, surface); 654 } 655 } 656 657 /** 658 * An interface for choosing an EGLConfig configuration from a list of 659 * potential configurations. 660 * <p> 661 * This interface must be implemented by clients wishing to call 662 * {@link GLSurfaceView#setEGLConfigChooser(EGLConfigChooser)} 663 */ 664 public interface EGLConfigChooser { 665 /** 666 * Choose a configuration from the list. Implementors typically 667 * implement this method by calling 668 * {@link EGL10#eglChooseConfig} and iterating through the results. Please consult the 669 * EGL specification available from The Khronos Group to learn how to call eglChooseConfig. 670 * @param egl the EGL10 for the current display. 671 * @param display the current display. 672 * @return the chosen configuration. 673 */ 674 EGLConfig chooseConfig(EGL10 egl, EGLDisplay display); 675 } 676 677 private static abstract class BaseConfigChooser 678 implements EGLConfigChooser { 679 public BaseConfigChooser(int[] configSpec) { 680 mConfigSpec = configSpec; 681 } 682 public EGLConfig chooseConfig(EGL10 egl, EGLDisplay display) { 683 int[] num_config = new int[1]; 684 egl.eglChooseConfig(display, mConfigSpec, null, 0, num_config); 685 686 int numConfigs = num_config[0]; 687 688 if (numConfigs <= 0) { 689 throw new IllegalArgumentException( 690 "No configs match configSpec"); 691 } 692 693 EGLConfig[] configs = new EGLConfig[numConfigs]; 694 egl.eglChooseConfig(display, mConfigSpec, configs, numConfigs, 695 num_config); 696 EGLConfig config = chooseConfig(egl, display, configs); 697 if (config == null) { 698 throw new IllegalArgumentException("No config chosen"); 699 } 700 return config; 701 } 702 703 abstract EGLConfig chooseConfig(EGL10 egl, EGLDisplay display, 704 EGLConfig[] configs); 705 706 protected int[] mConfigSpec; 707 } 708 709 private static class ComponentSizeChooser extends BaseConfigChooser { 710 public ComponentSizeChooser(int redSize, int greenSize, int blueSize, 711 int alphaSize, int depthSize, int stencilSize) { 712 super(new int[] { 713 EGL10.EGL_RED_SIZE, redSize, 714 EGL10.EGL_GREEN_SIZE, greenSize, 715 EGL10.EGL_BLUE_SIZE, blueSize, 716 EGL10.EGL_ALPHA_SIZE, alphaSize, 717 EGL10.EGL_DEPTH_SIZE, depthSize, 718 EGL10.EGL_STENCIL_SIZE, stencilSize, 719 EGL10.EGL_NONE}); 720 mValue = new int[1]; 721 mRedSize = redSize; 722 mGreenSize = greenSize; 723 mBlueSize = blueSize; 724 mAlphaSize = alphaSize; 725 mDepthSize = depthSize; 726 mStencilSize = stencilSize; 727 } 728 729 @Override 730 public EGLConfig chooseConfig(EGL10 egl, EGLDisplay display, 731 EGLConfig[] configs) { 732 EGLConfig closestConfig = null; 733 int closestDistance = 1000; 734 for(EGLConfig config : configs) { 735 int d = findConfigAttrib(egl, display, config, 736 EGL10.EGL_DEPTH_SIZE, 0); 737 int s = findConfigAttrib(egl, display, config, 738 EGL10.EGL_STENCIL_SIZE, 0); 739 if (d >= mDepthSize && s>= mStencilSize) { 740 int r = findConfigAttrib(egl, display, config, 741 EGL10.EGL_RED_SIZE, 0); 742 int g = findConfigAttrib(egl, display, config, 743 EGL10.EGL_GREEN_SIZE, 0); 744 int b = findConfigAttrib(egl, display, config, 745 EGL10.EGL_BLUE_SIZE, 0); 746 int a = findConfigAttrib(egl, display, config, 747 EGL10.EGL_ALPHA_SIZE, 0); 748 int distance = Math.abs(r - mRedSize) 749 + Math.abs(g - mGreenSize) 750 + Math.abs(b - mBlueSize) 751 + Math.abs(a - mAlphaSize); 752 if (distance < closestDistance) { 753 closestDistance = distance; 754 closestConfig = config; 755 } 756 } 757 } 758 return closestConfig; 759 } 760 761 private int findConfigAttrib(EGL10 egl, EGLDisplay display, 762 EGLConfig config, int attribute, int defaultValue) { 763 764 if (egl.eglGetConfigAttrib(display, config, attribute, mValue)) { 765 return mValue[0]; 766 } 767 return defaultValue; 768 } 769 770 private int[] mValue; 771 // Subclasses can adjust these values: 772 protected int mRedSize; 773 protected int mGreenSize; 774 protected int mBlueSize; 775 protected int mAlphaSize; 776 protected int mDepthSize; 777 protected int mStencilSize; 778 } 779 780 /** 781 * This class will choose a supported surface as close to 782 * RGB565 as possible, with or without a depth buffer. 783 * 784 */ 785 private static class SimpleEGLConfigChooser extends ComponentSizeChooser { 786 public SimpleEGLConfigChooser(boolean withDepthBuffer) { 787 super(4, 4, 4, 0, withDepthBuffer ? 16 : 0, 0); 788 // Adjust target values. This way we'll accept a 4444 or 789 // 555 buffer if there's no 565 buffer available. 790 mRedSize = 5; 791 mGreenSize = 6; 792 mBlueSize = 5; 793 } 794 } 795 796 /** 797 * An EGL helper class. 798 */ 799 800 private class EglHelper { 801 public EglHelper() { 802 803 } 804 805 /** 806 * Initialize EGL for a given configuration spec. 807 * @param configSpec 808 */ 809 public void start(){ 810 /* 811 * Get an EGL instance 812 */ 813 mEgl = (EGL10) EGLContext.getEGL(); 814 815 /* 816 * Get to the default display. 817 */ 818 mEglDisplay = mEgl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY); 819 820 /* 821 * We can now initialize EGL for that display 822 */ 823 int[] version = new int[2]; 824 mEgl.eglInitialize(mEglDisplay, version); 825 mEglConfig = mEGLConfigChooser.chooseConfig(mEgl, mEglDisplay); 826 827 /* 828 * Create an OpenGL ES context. This must be done only once, an 829 * OpenGL context is a somewhat heavy object. 830 */ 831 mEglContext = mEGLContextFactory.createContext(mEgl, mEglDisplay, mEglConfig); 832 833 mEglSurface = null; 834 } 835 836 /* 837 * React to the creation of a new surface by creating and returning an 838 * OpenGL interface that renders to that surface. 839 */ 840 public GL createSurface(SurfaceHolder holder) { 841 /* 842 * The window size has changed, so we need to create a new 843 * surface. 844 */ 845 if (mEglSurface != null) { 846 847 /* 848 * Unbind and destroy the old EGL surface, if 849 * there is one. 850 */ 851 mEgl.eglMakeCurrent(mEglDisplay, EGL10.EGL_NO_SURFACE, 852 EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT); 853 mEGLWindowSurfaceFactory.destroySurface(mEgl, mEglDisplay, mEglSurface); 854 } 855 856 /* 857 * Create an EGL surface we can render into. 858 */ 859 mEglSurface = mEGLWindowSurfaceFactory.createWindowSurface(mEgl, 860 mEglDisplay, mEglConfig, holder); 861 862 /* 863 * Before we can issue GL commands, we need to make sure 864 * the context is current and bound to a surface. 865 */ 866 mEgl.eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, 867 mEglContext); 868 869 GL gl = mEglContext.getGL(); 870 if (mGLWrapper != null) { 871 gl = mGLWrapper.wrap(gl); 872 } 873 874 if ((mDebugFlags & (DEBUG_CHECK_GL_ERROR | DEBUG_LOG_GL_CALLS))!= 0) { 875 int configFlags = 0; 876 Writer log = null; 877 if ((mDebugFlags & DEBUG_CHECK_GL_ERROR) != 0) { 878 configFlags |= GLDebugHelper.CONFIG_CHECK_GL_ERROR; 879 } 880 if ((mDebugFlags & DEBUG_LOG_GL_CALLS) != 0) { 881 log = new LogWriter(); 882 } 883 gl = GLDebugHelper.wrap(gl, configFlags, log); 884 } 885 return gl; 886 } 887 888 /** 889 * Display the current render surface. 890 * @return false if the context has been lost. 891 */ 892 public boolean swap() { 893 mEgl.eglSwapBuffers(mEglDisplay, mEglSurface); 894 895 /* 896 * Always check for EGL_CONTEXT_LOST, which means the context 897 * and all associated data were lost (For instance because 898 * the device went to sleep). We need to sleep until we 899 * get a new surface. 900 */ 901 return mEgl.eglGetError() != EGL11.EGL_CONTEXT_LOST; 902 } 903 904 public void destroySurface() { 905 if (mEglSurface != null) { 906 mEgl.eglMakeCurrent(mEglDisplay, EGL10.EGL_NO_SURFACE, 907 EGL10.EGL_NO_SURFACE, 908 EGL10.EGL_NO_CONTEXT); 909 mEGLWindowSurfaceFactory.destroySurface(mEgl, mEglDisplay, mEglSurface); 910 mEglSurface = null; 911 } 912 } 913 914 public void finish() { 915 if (mEglContext != null) { 916 mEGLContextFactory.destroyContext(mEgl, mEglDisplay, mEglContext); 917 mEglContext = null; 918 } 919 if (mEglDisplay != null) { 920 mEgl.eglTerminate(mEglDisplay); 921 mEglDisplay = null; 922 } 923 } 924 925 EGL10 mEgl; 926 EGLDisplay mEglDisplay; 927 EGLSurface mEglSurface; 928 EGLConfig mEglConfig; 929 EGLContext mEglContext; 930 } 931 932 /** 933 * A generic GL Thread. Takes care of initializing EGL and GL. Delegates 934 * to a Renderer instance to do the actual drawing. Can be configured to 935 * render continuously or on request. 936 * 937 */ 938 class GLThread extends Thread { 939 GLThread(Renderer renderer) { 940 super(); 941 mDone = false; 942 mWidth = 0; 943 mHeight = 0; 944 mRequestRender = true; 945 mRenderMode = RENDERMODE_CONTINUOUSLY; 946 mRenderer = renderer; 947 setName("GLThread"); 948 } 949 950 @Override 951 public void run() { 952 /* 953 * When the android framework launches a second instance of 954 * an activity, the new instance's onCreate() method may be 955 * called before the first instance returns from onDestroy(). 956 * 957 * This semaphore ensures that only one instance at a time 958 * accesses EGL. 959 */ 960 try { 961 try { 962 sEglSemaphore.acquire(); 963 } catch (InterruptedException e) { 964 return; 965 } 966 guardedRun(); 967 } catch (InterruptedException e) { 968 // fall thru and exit normally 969 } finally { 970 sEglSemaphore.release(); 971 } 972 } 973 974 private void guardedRun() throws InterruptedException { 975 mEglHelper = new EglHelper(); 976 try { 977 mEglHelper.start(); 978 979 GL10 gl = null; 980 boolean tellRendererSurfaceCreated = true; 981 boolean tellRendererSurfaceChanged = true; 982 983 /* 984 * This is our main activity thread's loop, we go until 985 * asked to quit. 986 */ 987 while (!mDone) { 988 989 /* 990 * Update the asynchronous state (window size) 991 */ 992 int w, h; 993 boolean changed; 994 boolean needStart = false; 995 synchronized (this) { 996 Runnable r; 997 while ((r = getEvent()) != null) { 998 r.run(); 999 } 1000 if (mPaused) { 1001 mEglHelper.destroySurface(); 1002 mEglHelper.finish(); 1003 needStart = true; 1004 } 1005 while (needToWait()) { 1006 if (!mHasSurface) { 1007 if (!mWaitingForSurface) { 1008 mEglHelper.destroySurface(); 1009 mWaitingForSurface = true; 1010 notify(); 1011 } 1012 } 1013 wait(); 1014 } 1015 if (mDone) { 1016 break; 1017 } 1018 changed = mSizeChanged; 1019 w = mWidth; 1020 h = mHeight; 1021 mSizeChanged = false; 1022 mRequestRender = false; 1023 if (mHasSurface && mWaitingForSurface) { 1024 changed = true; 1025 mWaitingForSurface = false; 1026 } 1027 } 1028 if (needStart) { 1029 mEglHelper.start(); 1030 tellRendererSurfaceCreated = true; 1031 changed = true; 1032 } 1033 if (changed) { 1034 gl = (GL10) mEglHelper.createSurface(getHolder()); 1035 tellRendererSurfaceChanged = true; 1036 } 1037 if (tellRendererSurfaceCreated) { 1038 mRenderer.onSurfaceCreated(gl, mEglHelper.mEglConfig); 1039 tellRendererSurfaceCreated = false; 1040 } 1041 if (tellRendererSurfaceChanged) { 1042 mRenderer.onSurfaceChanged(gl, w, h); 1043 tellRendererSurfaceChanged = false; 1044 } 1045 if ((w > 0) && (h > 0)) { 1046 /* draw a frame here */ 1047 mRenderer.onDrawFrame(gl); 1048 1049 /* 1050 * Once we're done with GL, we need to call swapBuffers() 1051 * to instruct the system to display the rendered frame 1052 */ 1053 mEglHelper.swap(); 1054 } 1055 } 1056 } finally { 1057 /* 1058 * clean-up everything... 1059 */ 1060 mEglHelper.destroySurface(); 1061 mEglHelper.finish(); 1062 } 1063 } 1064 1065 private boolean needToWait() { 1066 if (mDone) { 1067 return false; 1068 } 1069 1070 if (mPaused || (! mHasSurface)) { 1071 return true; 1072 } 1073 1074 if ((mWidth > 0) && (mHeight > 0) && (mRequestRender || (mRenderMode == RENDERMODE_CONTINUOUSLY))) { 1075 return false; 1076 } 1077 1078 return true; 1079 } 1080 1081 public void setRenderMode(int renderMode) { 1082 if ( !((RENDERMODE_WHEN_DIRTY <= renderMode) && (renderMode <= RENDERMODE_CONTINUOUSLY)) ) { 1083 throw new IllegalArgumentException("renderMode"); 1084 } 1085 synchronized(this) { 1086 mRenderMode = renderMode; 1087 if (renderMode == RENDERMODE_CONTINUOUSLY) { 1088 notify(); 1089 } 1090 } 1091 } 1092 1093 public int getRenderMode() { 1094 synchronized(this) { 1095 return mRenderMode; 1096 } 1097 } 1098 1099 public void requestRender() { 1100 synchronized(this) { 1101 mRequestRender = true; 1102 notify(); 1103 } 1104 } 1105 1106 public void surfaceCreated() { 1107 synchronized(this) { 1108 mHasSurface = true; 1109 notify(); 1110 } 1111 } 1112 1113 public void surfaceDestroyed() { 1114 synchronized(this) { 1115 mHasSurface = false; 1116 notify(); 1117 while(!mWaitingForSurface && isAlive()) { 1118 try { 1119 wait(); 1120 } catch (InterruptedException e) { 1121 Thread.currentThread().interrupt(); 1122 } 1123 } 1124 } 1125 } 1126 1127 public void onPause() { 1128 synchronized (this) { 1129 mPaused = true; 1130 } 1131 } 1132 1133 public void onResume() { 1134 synchronized (this) { 1135 mPaused = false; 1136 notify(); 1137 } 1138 } 1139 1140 public void onWindowResize(int w, int h) { 1141 synchronized (this) { 1142 mWidth = w; 1143 mHeight = h; 1144 mSizeChanged = true; 1145 notify(); 1146 } 1147 } 1148 1149 public void requestExitAndWait() { 1150 // don't call this from GLThread thread or it is a guaranteed 1151 // deadlock! 1152 synchronized(this) { 1153 mDone = true; 1154 notify(); 1155 } 1156 try { 1157 join(); 1158 } catch (InterruptedException ex) { 1159 Thread.currentThread().interrupt(); 1160 } 1161 } 1162 1163 /** 1164 * Queue an "event" to be run on the GL rendering thread. 1165 * @param r the runnable to be run on the GL rendering thread. 1166 */ 1167 public void queueEvent(Runnable r) { 1168 synchronized(this) { 1169 mEventQueue.add(r); 1170 } 1171 } 1172 1173 private Runnable getEvent() { 1174 synchronized(this) { 1175 if (mEventQueue.size() > 0) { 1176 return mEventQueue.remove(0); 1177 } 1178 1179 } 1180 return null; 1181 } 1182 1183 private boolean mDone; 1184 private boolean mPaused; 1185 private boolean mHasSurface; 1186 private boolean mWaitingForSurface; 1187 private int mWidth; 1188 private int mHeight; 1189 private int mRenderMode; 1190 private boolean mRequestRender; 1191 private Renderer mRenderer; 1192 private ArrayList<Runnable> mEventQueue = new ArrayList<Runnable>(); 1193 private EglHelper mEglHelper; 1194 } 1195 1196 static class LogWriter extends Writer { 1197 1198 @Override public void close() { 1199 flushBuilder(); 1200 } 1201 1202 @Override public void flush() { 1203 flushBuilder(); 1204 } 1205 1206 @Override public void write(char[] buf, int offset, int count) { 1207 for(int i = 0; i < count; i++) { 1208 char c = buf[offset + i]; 1209 if ( c == '\n') { 1210 flushBuilder(); 1211 } 1212 else { 1213 mBuilder.append(c); 1214 } 1215 } 1216 } 1217 1218 private void flushBuilder() { 1219 if (mBuilder.length() > 0) { 1220 Log.v("GLSurfaceView", mBuilder.toString()); 1221 mBuilder.delete(0, mBuilder.length()); 1222 } 1223 } 1224 1225 private StringBuilder mBuilder = new StringBuilder(); 1226 } 1227 1228 1229 private void checkRenderThreadState() { 1230 if (mGLThread != null) { 1231 throw new IllegalStateException( 1232 "setRenderer has already been called for this instance."); 1233 } 1234 } 1235 1236 private static final Semaphore sEglSemaphore = new Semaphore(1); 1237 private boolean mSizeChanged = true; 1238 1239 private GLThread mGLThread; 1240 private EGLConfigChooser mEGLConfigChooser; 1241 private EGLContextFactory mEGLContextFactory; 1242 private EGLWindowSurfaceFactory mEGLWindowSurfaceFactory; 1243 private GLWrapper mGLWrapper; 1244 private int mDebugFlags; 1245} 1246