LayerRenderer.cpp revision 8564c8da817a845353d213acd8636b76f567b234
1/* 2 * Copyright (C) 2011 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 17#define LOG_TAG "OpenGLRenderer" 18 19#include <ui/Rect.h> 20 21#include "LayerCache.h" 22#include "LayerRenderer.h" 23#include "Matrix.h" 24#include "Properties.h" 25#include "Rect.h" 26 27namespace android { 28namespace uirenderer { 29 30/////////////////////////////////////////////////////////////////////////////// 31// Rendering 32/////////////////////////////////////////////////////////////////////////////// 33 34LayerRenderer::LayerRenderer(Layer* layer): mLayer(layer) { 35} 36 37LayerRenderer::~LayerRenderer() { 38} 39 40void LayerRenderer::prepareDirty(float left, float top, float right, float bottom, bool opaque) { 41 LAYER_RENDERER_LOGD("Rendering into layer, fbo = %d", mLayer->getFbo()); 42 43 glBindFramebuffer(GL_FRAMEBUFFER, mLayer->getFbo()); 44 45 const float width = mLayer->layer.getWidth(); 46 const float height = mLayer->layer.getHeight(); 47 48#if RENDER_LAYERS_AS_REGIONS 49 Rect dirty(left, top, right, bottom); 50 if (dirty.isEmpty() || (dirty.left <= 0 && dirty.top <= 0 && 51 dirty.right >= width && dirty.bottom >= height)) { 52 mLayer->region.clear(); 53 dirty.set(0.0f, 0.0f, width, height); 54 } else { 55 dirty.intersect(0.0f, 0.0f, width, height); 56 android::Rect r(dirty.left, dirty.top, dirty.right, dirty.bottom); 57 mLayer->region.subtractSelf(r); 58 } 59 60 OpenGLRenderer::prepareDirty(dirty.left, dirty.top, dirty.right, dirty.bottom, opaque); 61#else 62 OpenGLRenderer::prepareDirty(0.0f, 0.0f, width, height, opaque); 63#endif 64} 65 66void LayerRenderer::finish() { 67 OpenGLRenderer::finish(); 68 69 generateMesh(); 70 71 LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->getFbo()); 72 73 // No need to unbind our FBO, this will be taken care of by the caller 74 // who will invoke OpenGLRenderer::resume() 75} 76 77GLint LayerRenderer::getTargetFbo() { 78 return mLayer->getFbo(); 79} 80 81/////////////////////////////////////////////////////////////////////////////// 82// Dirty region tracking 83/////////////////////////////////////////////////////////////////////////////// 84 85bool LayerRenderer::hasLayer() { 86 return true; 87} 88 89Region* LayerRenderer::getRegion() { 90#if RENDER_LAYERS_AS_REGIONS 91 if (getSnapshot()->flags & Snapshot::kFlagFboTarget) { 92 return OpenGLRenderer::getRegion(); 93 } 94 return &mLayer->region; 95#else 96 return OpenGLRenderer::getRegion(); 97#endif 98} 99 100// TODO: This implementation is flawed and can generate T-junctions 101// in the mesh, which will in turn produce cracks when the 102// mesh is rotated/skewed. The easiest way to fix this would 103// be, for each row, to add new vertices shared with the previous 104// row when the two rows share an edge. 105// In practice, T-junctions do not appear often so this has yet 106// to be fixed. 107void LayerRenderer::generateMesh() { 108#if RENDER_LAYERS_AS_REGIONS 109 if (mLayer->region.isRect() || mLayer->region.isEmpty()) { 110 if (mLayer->mesh) { 111 delete mLayer->mesh; 112 delete mLayer->meshIndices; 113 114 mLayer->mesh = NULL; 115 mLayer->meshIndices = NULL; 116 mLayer->meshElementCount = 0; 117 } 118 119 mLayer->setRegionAsRect(); 120 return; 121 } 122 123 size_t count; 124 const android::Rect* rects = mLayer->region.getArray(&count); 125 126 GLsizei elementCount = count * 6; 127 128 if (mLayer->mesh && mLayer->meshElementCount < elementCount) { 129 delete mLayer->mesh; 130 delete mLayer->meshIndices; 131 132 mLayer->mesh = NULL; 133 mLayer->meshIndices = NULL; 134 } 135 136 bool rebuildIndices = false; 137 if (!mLayer->mesh) { 138 mLayer->mesh = new TextureVertex[count * 4]; 139 mLayer->meshIndices = new uint16_t[elementCount]; 140 rebuildIndices = true; 141 } 142 mLayer->meshElementCount = elementCount; 143 144 const float texX = 1.0f / float(mLayer->getWidth()); 145 const float texY = 1.0f / float(mLayer->getHeight()); 146 const float height = mLayer->layer.getHeight(); 147 148 TextureVertex* mesh = mLayer->mesh; 149 uint16_t* indices = mLayer->meshIndices; 150 151 for (size_t i = 0; i < count; i++) { 152 const android::Rect* r = &rects[i]; 153 154 const float u1 = r->left * texX; 155 const float v1 = (height - r->top) * texY; 156 const float u2 = r->right * texX; 157 const float v2 = (height - r->bottom) * texY; 158 159 TextureVertex::set(mesh++, r->left, r->top, u1, v1); 160 TextureVertex::set(mesh++, r->right, r->top, u2, v1); 161 TextureVertex::set(mesh++, r->left, r->bottom, u1, v2); 162 TextureVertex::set(mesh++, r->right, r->bottom, u2, v2); 163 164 if (rebuildIndices) { 165 uint16_t quad = i * 4; 166 int index = i * 6; 167 indices[index ] = quad; // top-left 168 indices[index + 1] = quad + 1; // top-right 169 indices[index + 2] = quad + 2; // bottom-left 170 indices[index + 3] = quad + 2; // bottom-left 171 indices[index + 4] = quad + 1; // top-right 172 indices[index + 5] = quad + 3; // bottom-right 173 } 174 } 175#endif 176} 177 178/////////////////////////////////////////////////////////////////////////////// 179// Layers management 180/////////////////////////////////////////////////////////////////////////////// 181 182Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) { 183 LAYER_RENDERER_LOGD("Requesting new render layer %dx%d", width, height); 184 185 Caches& caches = Caches::getInstance(); 186 GLuint fbo = caches.fboCache.get(); 187 if (!fbo) { 188 ALOGW("Could not obtain an FBO"); 189 return NULL; 190 } 191 192 caches.activeTexture(0); 193 Layer* layer = caches.layerCache.get(width, height); 194 if (!layer) { 195 ALOGW("Could not obtain a layer"); 196 return NULL; 197 } 198 199 layer->setFbo(fbo); 200 layer->layer.set(0.0f, 0.0f, width, height); 201 layer->texCoords.set(0.0f, height / float(layer->getHeight()), 202 width / float(layer->getWidth()), 0.0f); 203 layer->setAlpha(255, SkXfermode::kSrcOver_Mode); 204 layer->setBlend(!isOpaque); 205 layer->setColorFilter(NULL); 206 layer->region.clear(); 207 208 GLuint previousFbo; 209 glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo); 210 211 glBindFramebuffer(GL_FRAMEBUFFER, layer->getFbo()); 212 layer->bindTexture(); 213 214 // Initialize the texture if needed 215 if (layer->isEmpty()) { 216 layer->setEmpty(false); 217 layer->allocateTexture(GL_RGBA, GL_UNSIGNED_BYTE); 218 219 if (glGetError() != GL_NO_ERROR) { 220 ALOGD("Could not allocate texture for layer (fbo=%d %dx%d)", 221 fbo, width, height); 222 223 glBindFramebuffer(GL_FRAMEBUFFER, previousFbo); 224 caches.fboCache.put(fbo); 225 226 layer->deleteTexture(); 227 delete layer; 228 229 return NULL; 230 } 231 } 232 233 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 234 layer->getTexture(), 0); 235 236 glDisable(GL_SCISSOR_TEST); 237 glClear(GL_COLOR_BUFFER_BIT); 238 glEnable(GL_SCISSOR_TEST); 239 240 glBindFramebuffer(GL_FRAMEBUFFER, previousFbo); 241 242 return layer; 243} 244 245bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) { 246 if (layer) { 247 LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->getFbo(), width, height); 248 249 if (Caches::getInstance().layerCache.resize(layer, width, height)) { 250 layer->layer.set(0.0f, 0.0f, width, height); 251 layer->texCoords.set(0.0f, height / float(layer->getHeight()), 252 width / float(layer->getWidth()), 0.0f); 253 } else { 254 layer->deleteTexture(); 255 delete layer; 256 return false; 257 } 258 } 259 260 return true; 261} 262 263Layer* LayerRenderer::createTextureLayer(bool isOpaque) { 264 LAYER_RENDERER_LOGD("Creating new texture layer"); 265 266 Layer* layer = new Layer(0, 0); 267 layer->setCacheable(false); 268 layer->setTextureLayer(true); 269 layer->setBlend(!isOpaque); 270 layer->setEmpty(true); 271 layer->setFbo(0); 272 layer->setAlpha(255, SkXfermode::kSrcOver_Mode); 273 layer->layer.set(0.0f, 0.0f, 0.0f, 0.0f); 274 layer->texCoords.set(0.0f, 1.0f, 1.0f, 0.0f); 275 layer->region.clear(); 276 layer->setRenderTarget(GL_NONE); // see ::updateTextureLayer() 277 278 Caches::getInstance().activeTexture(0); 279 layer->generateTexture(); 280 281 return layer; 282} 283 284void LayerRenderer::updateTextureLayer(Layer* layer, uint32_t width, uint32_t height, 285 bool isOpaque, GLenum renderTarget, float* transform) { 286 if (layer) { 287 layer->setBlend(!isOpaque); 288 layer->setSize(width, height); 289 layer->layer.set(0.0f, 0.0f, width, height); 290 layer->region.set(width, height); 291 layer->regionRect.set(0.0f, 0.0f, width, height); 292 layer->getTexTransform().load(transform); 293 294 if (renderTarget != layer->getRenderTarget()) { 295 layer->setRenderTarget(renderTarget); 296 layer->bindTexture(); 297 layer->setFilter(GL_NEAREST, false, true); 298 layer->setWrap(GL_CLAMP_TO_EDGE, false, true); 299 } 300 } 301} 302 303void LayerRenderer::destroyLayer(Layer* layer) { 304 if (layer) { 305 LAYER_RENDERER_LOGD("Recycling layer, %dx%d fbo = %d", 306 layer->getWidth(), layer->getHeight(), layer->getFbo()); 307 308 GLuint fbo = layer->getFbo(); 309 if (fbo) { 310 flushLayer(layer); 311 Caches::getInstance().fboCache.put(fbo); 312 } 313 314 if (!Caches::getInstance().layerCache.put(layer)) { 315 LAYER_RENDERER_LOGD(" Destroyed!"); 316 layer->deleteTexture(); 317 delete layer; 318 } else { 319 LAYER_RENDERER_LOGD(" Cached!"); 320#if DEBUG_LAYER_RENDERER 321 Caches::getInstance().layerCache.dump(); 322#endif 323 layer->region.clear(); 324 } 325 } 326} 327 328void LayerRenderer::destroyLayerDeferred(Layer* layer) { 329 if (layer) { 330 LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->getFbo()); 331 332 Caches::getInstance().deleteLayerDeferred(layer); 333 } 334} 335 336void LayerRenderer::flushLayer(Layer* layer) { 337#ifdef GL_EXT_discard_framebuffer 338 GLuint fbo = layer->getFbo(); 339 if (layer && fbo) { 340 // If possible, discard any enqueud operations on deferred 341 // rendering architectures 342 if (Caches::getInstance().extensions.hasDiscardFramebuffer()) { 343 GLuint previousFbo; 344 glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo); 345 346 GLenum attachments = GL_COLOR_ATTACHMENT0; 347 if (fbo != previousFbo) glBindFramebuffer(GL_FRAMEBUFFER, fbo); 348 glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, &attachments); 349 350 if (fbo != previousFbo) glBindFramebuffer(GL_FRAMEBUFFER, previousFbo); 351 } 352 } 353#endif 354} 355 356bool LayerRenderer::copyLayer(Layer* layer, SkBitmap* bitmap) { 357 Caches& caches = Caches::getInstance(); 358 if (layer && layer->isTextureLayer() && bitmap->width() <= caches.maxTextureSize && 359 bitmap->height() <= caches.maxTextureSize) { 360 361 GLuint fbo = caches.fboCache.get(); 362 if (!fbo) { 363 ALOGW("Could not obtain an FBO"); 364 return false; 365 } 366 367 SkAutoLockPixels alp(*bitmap); 368 369 GLuint texture; 370 GLuint previousFbo; 371 372 GLenum format; 373 GLenum type; 374 375 GLenum error = GL_NO_ERROR; 376 bool status = false; 377 378 switch (bitmap->config()) { 379 case SkBitmap::kA8_Config: 380 format = GL_ALPHA; 381 type = GL_UNSIGNED_BYTE; 382 break; 383 case SkBitmap::kRGB_565_Config: 384 format = GL_RGB; 385 type = GL_UNSIGNED_SHORT_5_6_5; 386 break; 387 case SkBitmap::kARGB_4444_Config: 388 format = GL_RGBA; 389 type = GL_UNSIGNED_SHORT_4_4_4_4; 390 break; 391 case SkBitmap::kARGB_8888_Config: 392 default: 393 format = GL_RGBA; 394 type = GL_UNSIGNED_BYTE; 395 break; 396 } 397 398 float alpha = layer->getAlpha(); 399 SkXfermode::Mode mode = layer->getMode(); 400 401 layer->setAlpha(255, SkXfermode::kSrc_Mode); 402 layer->setFbo(fbo); 403 404 glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo); 405 glBindFramebuffer(GL_FRAMEBUFFER, fbo); 406 407 glGenTextures(1, &texture); 408 if ((error = glGetError()) != GL_NO_ERROR) goto error; 409 410 caches.activeTexture(0); 411 glBindTexture(GL_TEXTURE_2D, texture); 412 413 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 414 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 415 416 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 417 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 418 419 glTexImage2D(GL_TEXTURE_2D, 0, format, bitmap->width(), bitmap->height(), 420 0, format, type, NULL); 421 if ((error = glGetError()) != GL_NO_ERROR) goto error; 422 423 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, 424 GL_TEXTURE_2D, texture, 0); 425 if ((error = glGetError()) != GL_NO_ERROR) goto error; 426 427 { 428 LayerRenderer renderer(layer); 429 renderer.setViewport(bitmap->width(), bitmap->height()); 430 renderer.OpenGLRenderer::prepareDirty(0.0f, 0.0f, 431 bitmap->width(), bitmap->height(), !layer->isBlend()); 432 433 glDisable(GL_SCISSOR_TEST); 434 renderer.translate(0.0f, bitmap->height()); 435 renderer.scale(1.0f, -1.0f); 436 437 mat4 texTransform(layer->getTexTransform()); 438 439 mat4 invert; 440 invert.translate(0.0f, 1.0f, 0.0f); 441 invert.scale(1.0f, -1.0f, 1.0f); 442 layer->getTexTransform().multiply(invert); 443 444 if ((error = glGetError()) != GL_NO_ERROR) goto error; 445 446 { 447 Rect bounds; 448 bounds.set(0.0f, 0.0f, bitmap->width(), bitmap->height()); 449 renderer.drawTextureLayer(layer, bounds); 450 451 glReadPixels(0, 0, bitmap->width(), bitmap->height(), format, 452 type, bitmap->getPixels()); 453 454 if ((error = glGetError()) != GL_NO_ERROR) goto error; 455 } 456 457 layer->getTexTransform().load(texTransform); 458 status = true; 459 } 460 461error: 462 glEnable(GL_SCISSOR_TEST); 463 464#if DEBUG_OPENGL 465 if (error != GL_NO_ERROR) { 466 ALOGD("GL error while copying layer into bitmap = 0x%x", error); 467 } 468#endif 469 470 glBindFramebuffer(GL_FRAMEBUFFER, previousFbo); 471 layer->setAlpha(alpha, mode); 472 layer->setFbo(0); 473 glDeleteTextures(1, &texture); 474 caches.fboCache.put(fbo); 475 476 return status; 477 } 478 return false; 479} 480 481}; // namespace uirenderer 482}; // namespace android 483