LayerRenderer.cpp revision 6217a71cd281003a376d998269d577d26a61c206
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 "Properties.h" 24#include "Rect.h" 25 26namespace android { 27namespace uirenderer { 28 29/////////////////////////////////////////////////////////////////////////////// 30// Rendering 31/////////////////////////////////////////////////////////////////////////////// 32 33void LayerRenderer::prepareDirty(float left, float top, float right, float bottom, bool opaque) { 34 LAYER_RENDERER_LOGD("Rendering into layer, fbo = %d", mLayer->fbo); 35 36 glBindFramebuffer(GL_FRAMEBUFFER, mLayer->fbo); 37 38 const float width = mLayer->layer.getWidth(); 39 const float height = mLayer->layer.getHeight(); 40 41#if RENDER_LAYERS_AS_REGIONS 42 Rect dirty(left, top, right, bottom); 43 if (dirty.isEmpty() || (dirty.left <= 0 && dirty.top <= 0 && 44 dirty.right >= width && dirty.bottom >= height)) { 45 mLayer->region.clear(); 46 dirty.set(0.0f, 0.0f, width, height); 47 } else { 48 dirty.intersect(0.0f, 0.0f, width, height); 49 android::Rect r(dirty.left, dirty.top, dirty.right, dirty.bottom); 50 mLayer->region.subtractSelf(r); 51 } 52 53 OpenGLRenderer::prepareDirty(dirty.left, dirty.top, dirty.right, dirty.bottom, opaque); 54#else 55 OpenGLRenderer::prepareDirty(0.0f, 0.0f, width, height, opaque); 56#endif 57} 58 59void LayerRenderer::finish() { 60 OpenGLRenderer::finish(); 61 62 generateMesh(); 63 64 LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->fbo); 65 66 // No need to unbind our FBO, this will be taken care of by the caller 67 // who will invoke OpenGLRenderer::resume() 68} 69 70GLint LayerRenderer::getTargetFbo() { 71 return mLayer->fbo; 72} 73 74/////////////////////////////////////////////////////////////////////////////// 75// Dirty region tracking 76/////////////////////////////////////////////////////////////////////////////// 77 78bool LayerRenderer::hasLayer() { 79 return true; 80} 81 82Region* LayerRenderer::getRegion() { 83#if RENDER_LAYERS_AS_REGIONS 84 if (getSnapshot()->flags & Snapshot::kFlagFboTarget) { 85 return OpenGLRenderer::getRegion(); 86 } 87 return &mLayer->region; 88#else 89 return OpenGLRenderer::getRegion(); 90#endif 91} 92 93void LayerRenderer::generateMesh() { 94#if RENDER_LAYERS_AS_REGIONS 95#if RENDER_LAYERS_RECT_AS_RECT 96 if (mLayer->region.isRect() || mLayer->region.isEmpty()) { 97#else 98 if (mLayer->region.isEmpty()) { 99#endif 100 if (mLayer->mesh) { 101 delete mLayer->mesh; 102 delete mLayer->meshIndices; 103 104 mLayer->mesh = NULL; 105 mLayer->meshIndices = NULL; 106 mLayer->meshElementCount = 0; 107 } 108 return; 109 } 110 111 size_t count; 112 const android::Rect* rects = mLayer->region.getArray(&count); 113 114 GLsizei elementCount = count * 6; 115 116 if (mLayer->mesh && mLayer->meshElementCount < elementCount) { 117 delete mLayer->mesh; 118 delete mLayer->meshIndices; 119 120 mLayer->mesh = NULL; 121 mLayer->meshIndices = NULL; 122 } 123 124 bool rebuildIndices = false; 125 if (!mLayer->mesh) { 126 mLayer->mesh = new TextureVertex[count * 4]; 127 mLayer->meshIndices = new uint16_t[elementCount]; 128 rebuildIndices = true; 129 } 130 mLayer->meshElementCount = elementCount; 131 132 const float texX = 1.0f / float(mLayer->width); 133 const float texY = 1.0f / float(mLayer->height); 134 const float height = mLayer->layer.getHeight(); 135 136 TextureVertex* mesh = mLayer->mesh; 137 uint16_t* indices = mLayer->meshIndices; 138 139 for (size_t i = 0; i < count; i++) { 140 const android::Rect* r = &rects[i]; 141 142 const float u1 = r->left * texX; 143 const float v1 = (height - r->top) * texY; 144 const float u2 = r->right * texX; 145 const float v2 = (height - r->bottom) * texY; 146 147 TextureVertex::set(mesh++, r->left, r->top, u1, v1); 148 TextureVertex::set(mesh++, r->right, r->top, u2, v1); 149 TextureVertex::set(mesh++, r->left, r->bottom, u1, v2); 150 TextureVertex::set(mesh++, r->right, r->bottom, u2, v2); 151 152 if (rebuildIndices) { 153 uint16_t quad = i * 4; 154 int index = i * 6; 155 indices[index ] = quad; // top-left 156 indices[index + 1] = quad + 1; // top-right 157 indices[index + 2] = quad + 2; // bottom-left 158 indices[index + 3] = quad + 2; // bottom-left 159 indices[index + 4] = quad + 1; // top-right 160 indices[index + 5] = quad + 3; // bottom-right 161 } 162 } 163#endif 164} 165 166/////////////////////////////////////////////////////////////////////////////// 167// Layers management 168/////////////////////////////////////////////////////////////////////////////// 169 170Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) { 171 LAYER_RENDERER_LOGD("Creating new layer %dx%d", width, height); 172 173 GLuint fbo = Caches::getInstance().fboCache.get(); 174 if (!fbo) { 175 LOGW("Could not obtain an FBO"); 176 return NULL; 177 } 178 179 glActiveTexture(GL_TEXTURE0); 180 Layer* layer = Caches::getInstance().layerCache.get(width, height); 181 if (!layer) { 182 LOGW("Could not obtain a layer"); 183 return NULL; 184 } 185 186 layer->fbo = fbo; 187 layer->layer.set(0.0f, 0.0f, width, height); 188 layer->texCoords.set(0.0f, height / float(layer->height), 189 width / float(layer->width), 0.0f); 190 layer->alpha = 255; 191 layer->mode = SkXfermode::kSrcOver_Mode; 192 layer->blend = !isOpaque; 193 layer->colorFilter = NULL; 194 layer->region.clear(); 195 196 GLuint previousFbo; 197 glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo); 198 199 glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo); 200 glBindTexture(GL_TEXTURE_2D, layer->texture); 201 202 // Initialize the texture if needed 203 if (layer->empty) { 204 layer->empty = false; 205 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, layer->width, layer->height, 0, 206 GL_RGBA, GL_UNSIGNED_BYTE, NULL); 207 208 if (glGetError() != GL_NO_ERROR) { 209 LOGD("Could not allocate texture"); 210 glBindFramebuffer(GL_FRAMEBUFFER, previousFbo); 211 glDeleteTextures(1, &layer->texture); 212 Caches::getInstance().fboCache.put(fbo); 213 delete layer; 214 return NULL; 215 } 216 } 217 218 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 219 layer->texture, 0); 220 221 glDisable(GL_SCISSOR_TEST); 222 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 223 glClear(GL_COLOR_BUFFER_BIT); 224 glEnable(GL_SCISSOR_TEST); 225 226 glBindFramebuffer(GL_FRAMEBUFFER, previousFbo); 227 228 return layer; 229} 230 231bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) { 232 if (layer) { 233 LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->fbo, width, height); 234 235 if (Caches::getInstance().layerCache.resize(layer, width, height)) { 236 layer->layer.set(0.0f, 0.0f, width, height); 237 layer->texCoords.set(0.0f, height / float(layer->height), 238 width / float(layer->width), 0.0f); 239 } else { 240 if (layer->texture) glDeleteTextures(1, &layer->texture); 241 delete layer; 242 return false; 243 } 244 } 245 246 return true; 247} 248 249void LayerRenderer::destroyLayer(Layer* layer) { 250 if (layer) { 251 LAYER_RENDERER_LOGD("Destroying layer, fbo = %d", layer->fbo); 252 253 if (layer->fbo) { 254 Caches::getInstance().fboCache.put(layer->fbo); 255 } 256 257 if (!Caches::getInstance().layerCache.put(layer)) { 258 if (layer->texture) glDeleteTextures(1, &layer->texture); 259 delete layer; 260 } else { 261 layer->region.clear(); 262 } 263 } 264} 265 266void LayerRenderer::destroyLayerDeferred(Layer* layer) { 267 if (layer) { 268 LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->fbo); 269 270 Caches::getInstance().deleteLayerDeferred(layer); 271 } 272} 273 274}; // namespace uirenderer 275}; // namespace android 276