LayerRenderer.cpp revision 7953745dd565167113f8cbfc461bc0521d32d870
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 GLuint fbo = Caches::getInstance().fboCache.get(); 186 if (!fbo) { 187 LOGW("Could not obtain an FBO"); 188 return NULL; 189 } 190 191 glActiveTexture(GL_TEXTURE0); 192 Layer* layer = Caches::getInstance().layerCache.get(width, height); 193 if (!layer) { 194 LOGW("Could not obtain a layer"); 195 return NULL; 196 } 197 198 layer->setFbo(fbo); 199 layer->layer.set(0.0f, 0.0f, width, height); 200 layer->texCoords.set(0.0f, height / float(layer->getHeight()), 201 width / float(layer->getWidth()), 0.0f); 202 layer->setAlpha(255, SkXfermode::kSrcOver_Mode); 203 layer->setBlend(!isOpaque); 204 layer->setColorFilter(NULL); 205 layer->region.clear(); 206 207 GLuint previousFbo; 208 glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo); 209 210 glBindFramebuffer(GL_FRAMEBUFFER, layer->getFbo()); 211 layer->bindTexture(); 212 213 // Initialize the texture if needed 214 if (layer->isEmpty()) { 215 layer->setEmpty(false); 216 layer->allocateTexture(GL_RGBA, GL_UNSIGNED_BYTE); 217 218 if (glGetError() != GL_NO_ERROR) { 219 LOGD("Could not allocate texture"); 220 221 glBindFramebuffer(GL_FRAMEBUFFER, previousFbo); 222 Caches::getInstance().fboCache.put(fbo); 223 224 layer->deleteTexture(); 225 delete layer; 226 227 return NULL; 228 } 229 } 230 231 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 232 layer->getTexture(), 0); 233 234 glDisable(GL_SCISSOR_TEST); 235 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 236 glClear(GL_COLOR_BUFFER_BIT); 237 glEnable(GL_SCISSOR_TEST); 238 239 glBindFramebuffer(GL_FRAMEBUFFER, previousFbo); 240 241 return layer; 242} 243 244bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) { 245 if (layer) { 246 LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->getFbo(), width, height); 247 248 if (Caches::getInstance().layerCache.resize(layer, width, height)) { 249 layer->layer.set(0.0f, 0.0f, width, height); 250 layer->texCoords.set(0.0f, height / float(layer->getHeight()), 251 width / float(layer->getWidth()), 0.0f); 252 } else { 253 layer->deleteTexture(); 254 delete layer; 255 return false; 256 } 257 } 258 259 return true; 260} 261 262Layer* LayerRenderer::createTextureLayer(bool isOpaque) { 263 LAYER_RENDERER_LOGD("Creating new texture layer"); 264 265 Layer* layer = new Layer(0, 0); 266 layer->setCacheable(false); 267 layer->setTextureLayer(true); 268 layer->setBlend(!isOpaque); 269 layer->setEmpty(true); 270 layer->setFbo(0); 271 layer->setAlpha(255, SkXfermode::kSrcOver_Mode); 272 layer->layer.set(0.0f, 0.0f, 0.0f, 0.0f); 273 layer->texCoords.set(0.0f, 1.0f, 1.0f, 0.0f); 274 layer->region.clear(); 275 layer->setRenderTarget(GL_NONE); // see ::updateTextureLayer() 276 277 glActiveTexture(GL_TEXTURE0); 278 layer->generateTexture(); 279 280 return layer; 281} 282 283void LayerRenderer::updateTextureLayer(Layer* layer, uint32_t width, uint32_t height, 284 bool isOpaque, GLenum renderTarget, float* transform) { 285 if (layer) { 286 layer->setBlend(!isOpaque); 287 layer->setSize(width, height); 288 layer->layer.set(0.0f, 0.0f, width, height); 289 layer->region.set(width, height); 290 layer->regionRect.set(0.0f, 0.0f, width, height); 291 layer->getTexTransform().load(transform); 292 293 if (renderTarget != layer->getRenderTarget()) { 294 layer->setRenderTarget(renderTarget); 295 layer->bindTexture(); 296 layer->setFilter(GL_NEAREST, GL_NEAREST, false, true); 297 layer->setWrap(GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, false, true); 298 } 299 } 300} 301 302void LayerRenderer::destroyLayer(Layer* layer) { 303 if (layer) { 304 LAYER_RENDERER_LOGD("Recycling layer, %dx%d fbo = %d", 305 layer->getWidth(), layer->getHeight(), layer->getFbo()); 306 307 if (layer->getFbo()) { 308 Caches::getInstance().fboCache.put(layer->getFbo()); 309 } 310 311 if (!Caches::getInstance().layerCache.put(layer)) { 312 LAYER_RENDERER_LOGD(" Destroyed!"); 313 layer->deleteTexture(); 314 delete layer; 315 } else { 316 LAYER_RENDERER_LOGD(" Cached!"); 317#if DEBUG_LAYER_RENDERER 318 Caches::getInstance().layerCache.dump(); 319#endif 320 layer->region.clear(); 321 } 322 } 323} 324 325void LayerRenderer::destroyLayerDeferred(Layer* layer) { 326 if (layer) { 327 LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->getFbo()); 328 329 Caches::getInstance().deleteLayerDeferred(layer); 330 } 331} 332 333bool LayerRenderer::copyLayer(Layer* layer, SkBitmap* bitmap) { 334 Caches& caches = Caches::getInstance(); 335 if (layer && layer->isTextureLayer() && bitmap->width() <= caches.maxTextureSize && 336 bitmap->height() <= caches.maxTextureSize) { 337 338 GLuint fbo = caches.fboCache.get(); 339 if (!fbo) { 340 LOGW("Could not obtain an FBO"); 341 return false; 342 } 343 344 SkAutoLockPixels alp(*bitmap); 345 346 GLuint texture; 347 GLuint previousFbo; 348 349 GLenum format; 350 GLenum type; 351 352 GLenum error = GL_NO_ERROR; 353 bool status = false; 354 355 switch (bitmap->config()) { 356 case SkBitmap::kA8_Config: 357 format = GL_ALPHA; 358 type = GL_UNSIGNED_BYTE; 359 break; 360 case SkBitmap::kRGB_565_Config: 361 format = GL_RGB; 362 type = GL_UNSIGNED_SHORT_5_6_5; 363 break; 364 case SkBitmap::kARGB_4444_Config: 365 format = GL_RGBA; 366 type = GL_UNSIGNED_SHORT_4_4_4_4; 367 break; 368 case SkBitmap::kARGB_8888_Config: 369 default: 370 format = GL_RGBA; 371 type = GL_UNSIGNED_BYTE; 372 break; 373 } 374 375 float alpha = layer->getAlpha(); 376 SkXfermode::Mode mode = layer->getMode(); 377 378 layer->setAlpha(255, SkXfermode::kSrc_Mode); 379 layer->setFbo(fbo); 380 381 glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo); 382 glBindFramebuffer(GL_FRAMEBUFFER, fbo); 383 384 glGenTextures(1, &texture); 385 if ((error = glGetError()) != GL_NO_ERROR) goto error; 386 387 glActiveTexture(GL_TEXTURE0); 388 glBindTexture(GL_TEXTURE_2D, texture); 389 390 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 391 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 392 393 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 394 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 395 396 glTexImage2D(GL_TEXTURE_2D, 0, format, bitmap->width(), bitmap->height(), 397 0, format, type, NULL); 398 if ((error = glGetError()) != GL_NO_ERROR) goto error; 399 400 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, 401 GL_TEXTURE_2D, texture, 0); 402 if ((error = glGetError()) != GL_NO_ERROR) goto error; 403 404 { 405 LayerRenderer renderer(layer); 406 renderer.setViewport(bitmap->width(), bitmap->height()); 407 renderer.OpenGLRenderer::prepareDirty(0.0f, 0.0f, 408 bitmap->width(), bitmap->height(), !layer->isBlend()); 409 410 glDisable(GL_SCISSOR_TEST); 411 renderer.translate(0.0f, bitmap->height()); 412 renderer.scale(1.0f, -1.0f); 413 414 mat4 texTransform(layer->getTexTransform()); 415 416 mat4 invert; 417 invert.translate(0.0f, 1.0f, 0.0f); 418 invert.scale(1.0f, -1.0f, 1.0f); 419 layer->getTexTransform().multiply(invert); 420 421 if ((error = glGetError()) != GL_NO_ERROR) goto error; 422 423 { 424 Rect bounds; 425 bounds.set(0.0f, 0.0f, bitmap->width(), bitmap->height()); 426 renderer.drawTextureLayer(layer, bounds); 427 428 glReadPixels(0, 0, bitmap->width(), bitmap->height(), format, 429 type, bitmap->getPixels()); 430 431 if ((error = glGetError()) != GL_NO_ERROR) goto error; 432 } 433 434 layer->getTexTransform().load(texTransform); 435 status = true; 436 } 437 438error: 439#if DEBUG_OPENGL 440 if (error != GL_NO_ERROR) { 441 LOGD("GL error while copying layer into bitmap = 0x%x", error); 442 } 443#endif 444 445 glBindFramebuffer(GL_FRAMEBUFFER, previousFbo); 446 layer->setAlpha(alpha, mode); 447 layer->setFbo(0); 448 glDeleteTextures(1, &texture); 449 caches.fboCache.put(fbo); 450 451 return status; 452 } 453 return false; 454} 455 456}; // namespace uirenderer 457}; // namespace android 458