LayerRenderer.cpp revision 09b7c91de73b59aa3f679b3ae3ba299f82ec9f8a 
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        return;
105    }
106
107    size_t count;
108    const android::Rect* rects = mLayer->region.getArray(&count);
109
110    GLsizei elementCount = count * 6;
111
112    if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
113        delete mLayer->mesh;
114        delete mLayer->meshIndices;
115
116        mLayer->mesh = NULL;
117        mLayer->meshIndices = NULL;
118    }
119
120    bool rebuildIndices = false;
121    if (!mLayer->mesh) {
122        mLayer->mesh = new TextureVertex[count * 4];
123        mLayer->meshIndices = new uint16_t[elementCount];
124        rebuildIndices = true;
125    }
126    mLayer->meshElementCount = elementCount;
127
128    const float texX = 1.0f / float(mLayer->width);
129    const float texY = 1.0f / float(mLayer->height);
130    const float height = mLayer->layer.getHeight();
131
132    TextureVertex* mesh = mLayer->mesh;
133    uint16_t* indices = mLayer->meshIndices;
134
135    for (size_t i = 0; i < count; i++) {
136        const android::Rect* r = &rects[i];
137
138        const float u1 = r->left * texX;
139        const float v1 = (height - r->top) * texY;
140        const float u2 = r->right * texX;
141        const float v2 = (height - r->bottom) * texY;
142
143        TextureVertex::set(mesh++, r->left, r->top, u1, v1);
144        TextureVertex::set(mesh++, r->right, r->top, u2, v1);
145        TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
146        TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
147
148        if (rebuildIndices) {
149            uint16_t quad = i * 4;
150            int index = i * 6;
151            indices[index    ] = quad;       // top-left
152            indices[index + 1] = quad + 1;   // top-right
153            indices[index + 2] = quad + 2;   // bottom-left
154            indices[index + 3] = quad + 2;   // bottom-left
155            indices[index + 4] = quad + 1;   // top-right
156            indices[index + 5] = quad + 3;   // bottom-right
157        }
158    }
159#endif
160}
161
162///////////////////////////////////////////////////////////////////////////////
163// Layers management
164///////////////////////////////////////////////////////////////////////////////
165
166Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) {
167    LAYER_RENDERER_LOGD("Creating new layer %dx%d", width, height);
168
169    GLuint fbo = Caches::getInstance().fboCache.get();
170    if (!fbo) {
171        LOGW("Could not obtain an FBO");
172        return NULL;
173    }
174
175    glActiveTexture(GL_TEXTURE0);
176    Layer* layer = Caches::getInstance().layerCache.get(width, height);
177    if (!layer) {
178        LOGW("Could not obtain a layer");
179        return NULL;
180    }
181
182    layer->fbo = fbo;
183    layer->layer.set(0.0f, 0.0f, width, height);
184    layer->texCoords.set(0.0f, height / float(layer->height),
185            width / float(layer->width), 0.0f);
186    layer->alpha = 255;
187    layer->mode = SkXfermode::kSrcOver_Mode;
188    layer->blend = !isOpaque;
189    layer->colorFilter = NULL;
190    layer->region.clear();
191
192    GLuint previousFbo;
193    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
194
195    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
196    glBindTexture(GL_TEXTURE_2D, layer->texture);
197
198    // Initialize the texture if needed
199    if (layer->empty) {
200        layer->empty = false;
201        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, layer->width, layer->height, 0,
202                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
203
204        if (glGetError() != GL_NO_ERROR) {
205            LOGD("Could not allocate texture");
206            glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
207            glDeleteTextures(1, &layer->texture);
208            Caches::getInstance().fboCache.put(fbo);
209            delete layer;
210            return NULL;
211        }
212    }
213
214    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
215            layer->texture, 0);
216
217    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
218
219    return layer;
220}
221
222bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
223    if (layer) {
224        LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->fbo, width, height);
225
226        if (Caches::getInstance().layerCache.resize(layer, width, height)) {
227            layer->layer.set(0.0f, 0.0f, width, height);
228            layer->texCoords.set(0.0f, height / float(layer->height),
229                    width / float(layer->width), 0.0f);
230        } else {
231            if (layer->texture) glDeleteTextures(1, &layer->texture);
232            delete layer;
233            return false;
234        }
235    }
236
237    return true;
238}
239
240void LayerRenderer::destroyLayer(Layer* layer) {
241    if (layer) {
242        LAYER_RENDERER_LOGD("Destroying layer, fbo = %d", layer->fbo);
243
244        if (layer->fbo) {
245            Caches::getInstance().fboCache.put(layer->fbo);
246        }
247
248        if (!Caches::getInstance().layerCache.put(layer)) {
249            if (layer->texture) glDeleteTextures(1, &layer->texture);
250            delete layer;
251        } else {
252            layer->region.clear();
253        }
254    }
255}
256
257void LayerRenderer::destroyLayerDeferred(Layer* layer) {
258    if (layer) {
259        LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->fbo);
260
261        Caches::getInstance().deleteLayerDeferred(layer);
262    }
263}
264
265}; // namespace uirenderer
266}; // namespace android
267