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