LayerRenderer.cpp revision 9fc27819d75e24ad63d7b383d80f5cb66a577a0d 
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 (mLayer->region.isRect() || mLayer->region.isEmpty()) {
96        if (mLayer->mesh) {
97            delete mLayer->mesh;
98            delete mLayer->meshIndices;
99
100            mLayer->mesh = NULL;
101            mLayer->meshIndices = NULL;
102            mLayer->meshElementCount = 0;
103        }
104
105        mLayer->setRegionAsRect();
106        return;
107    }
108
109    size_t count;
110    const android::Rect* rects = mLayer->region.getArray(&count);
111
112    GLsizei elementCount = count * 6;
113
114    if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
115        delete mLayer->mesh;
116        delete mLayer->meshIndices;
117
118        mLayer->mesh = NULL;
119        mLayer->meshIndices = NULL;
120    }
121
122    bool rebuildIndices = false;
123    if (!mLayer->mesh) {
124        mLayer->mesh = new TextureVertex[count * 4];
125        mLayer->meshIndices = new uint16_t[elementCount];
126        rebuildIndices = true;
127    }
128    mLayer->meshElementCount = elementCount;
129
130    const float texX = 1.0f / float(mLayer->width);
131    const float texY = 1.0f / float(mLayer->height);
132    const float height = mLayer->layer.getHeight();
133
134    TextureVertex* mesh = mLayer->mesh;
135    uint16_t* indices = mLayer->meshIndices;
136
137    for (size_t i = 0; i < count; i++) {
138        const android::Rect* r = &rects[i];
139
140        const float u1 = r->left * texX;
141        const float v1 = (height - r->top) * texY;
142        const float u2 = r->right * texX;
143        const float v2 = (height - r->bottom) * texY;
144
145        TextureVertex::set(mesh++, r->left, r->top, u1, v1);
146        TextureVertex::set(mesh++, r->right, r->top, u2, v1);
147        TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
148        TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
149
150        if (rebuildIndices) {
151            uint16_t quad = i * 4;
152            int index = i * 6;
153            indices[index    ] = quad;       // top-left
154            indices[index + 1] = quad + 1;   // top-right
155            indices[index + 2] = quad + 2;   // bottom-left
156            indices[index + 3] = quad + 2;   // bottom-left
157            indices[index + 4] = quad + 1;   // top-right
158            indices[index + 5] = quad + 3;   // bottom-right
159        }
160    }
161#endif
162}
163
164///////////////////////////////////////////////////////////////////////////////
165// Layers management
166///////////////////////////////////////////////////////////////////////////////
167
168Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) {
169    LAYER_RENDERER_LOGD("Creating new layer %dx%d", width, height);
170
171    GLuint fbo = Caches::getInstance().fboCache.get();
172    if (!fbo) {
173        LOGW("Could not obtain an FBO");
174        return NULL;
175    }
176
177    glActiveTexture(GL_TEXTURE0);
178    Layer* layer = Caches::getInstance().layerCache.get(width, height);
179    if (!layer) {
180        LOGW("Could not obtain a layer");
181        return NULL;
182    }
183
184    layer->fbo = fbo;
185    layer->layer.set(0.0f, 0.0f, width, height);
186    layer->texCoords.set(0.0f, height / float(layer->height),
187            width / float(layer->width), 0.0f);
188    layer->alpha = 255;
189    layer->mode = SkXfermode::kSrcOver_Mode;
190    layer->blend = !isOpaque;
191    layer->colorFilter = NULL;
192    layer->region.clear();
193
194    GLuint previousFbo;
195    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
196
197    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
198    glBindTexture(GL_TEXTURE_2D, layer->texture);
199
200    // Initialize the texture if needed
201    if (layer->empty) {
202        layer->empty = false;
203        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, layer->width, layer->height, 0,
204                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
205
206        if (glGetError() != GL_NO_ERROR) {
207            LOGD("Could not allocate texture");
208            glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
209            glDeleteTextures(1, &layer->texture);
210            Caches::getInstance().fboCache.put(fbo);
211            delete layer;
212            return NULL;
213        }
214    }
215
216    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
217            layer->texture, 0);
218
219    glDisable(GL_SCISSOR_TEST);
220    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
221    glClear(GL_COLOR_BUFFER_BIT);
222    glEnable(GL_SCISSOR_TEST);
223
224    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
225
226    return layer;
227}
228
229bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
230    if (layer) {
231        LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->fbo, width, height);
232
233        if (Caches::getInstance().layerCache.resize(layer, width, height)) {
234            layer->layer.set(0.0f, 0.0f, width, height);
235            layer->texCoords.set(0.0f, height / float(layer->height),
236                    width / float(layer->width), 0.0f);
237        } else {
238            if (layer->texture) glDeleteTextures(1, &layer->texture);
239            delete layer;
240            return false;
241        }
242    }
243
244    return true;
245}
246
247void LayerRenderer::destroyLayer(Layer* layer) {
248    if (layer) {
249        LAYER_RENDERER_LOGD("Destroying layer, fbo = %d", layer->fbo);
250
251        if (layer->fbo) {
252            Caches::getInstance().fboCache.put(layer->fbo);
253        }
254
255        if (!Caches::getInstance().layerCache.put(layer)) {
256            if (layer->texture) glDeleteTextures(1, &layer->texture);
257            delete layer;
258        } else {
259            layer->region.clear();
260        }
261    }
262}
263
264void LayerRenderer::destroyLayerDeferred(Layer* layer) {
265    if (layer) {
266        LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->fbo);
267
268        Caches::getInstance().deleteLayerDeferred(layer);
269    }
270}
271
272}; // namespace uirenderer
273}; // namespace android
274