LayerRenderer.cpp revision c88e357d1ed9dadfc0efb3dfbe92f24460674ef5 
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 "LayerRenderer.h"
20#include "Properties.h"
21
22namespace android {
23namespace uirenderer {
24
25///////////////////////////////////////////////////////////////////////////////
26// Rendering
27///////////////////////////////////////////////////////////////////////////////
28
29void LayerRenderer::prepare(bool opaque) {
30    LAYER_RENDERER_LOGD("Rendering into layer, fbo = %d", mLayer->fbo);
31
32#if RENDER_LAYERS_AS_REGIONS
33    mLayer->region.clear();
34#endif
35
36    glBindFramebuffer(GL_FRAMEBUFFER, mLayer->fbo);
37
38    OpenGLRenderer::prepare(opaque);
39}
40
41void LayerRenderer::finish() {
42    OpenGLRenderer::finish();
43
44    generateMesh();
45
46    LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->mFbo);
47
48    // No need to unbind our FBO, this will be taken care of by the caller
49    // who will invoke OpenGLRenderer::resume()
50}
51
52GLint LayerRenderer::getTargetFbo() {
53    return mLayer->fbo;
54}
55
56///////////////////////////////////////////////////////////////////////////////
57// Dirty region tracking
58///////////////////////////////////////////////////////////////////////////////
59
60bool LayerRenderer::hasLayer() {
61    return true;
62}
63
64Region* LayerRenderer::getRegion() {
65#if RENDER_LAYERS_AS_REGIONS
66    if (getSnapshot()->flags & Snapshot::kFlagFboTarget) {
67        return OpenGLRenderer::getRegion();
68    }
69    return &mLayer->region;
70#else
71    return OpenGLRenderer::getRegion();
72#endif
73}
74
75void LayerRenderer::generateMesh() {
76#if RENDER_LAYERS_AS_REGIONS
77    if (mLayer->region.isRect() || mLayer->region.isEmpty()) {
78        if (mLayer->mesh) {
79            delete mLayer->mesh;
80            delete mLayer->meshIndices;
81
82            mLayer->mesh = NULL;
83            mLayer->meshIndices = NULL;
84            mLayer->meshElementCount = 0;
85        }
86        return;
87    }
88
89    size_t count;
90    const android::Rect* rects = mLayer->region.getArray(&count);
91
92    GLsizei elementCount = count * 6;
93
94    if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
95        delete mLayer->mesh;
96        delete mLayer->meshIndices;
97
98        mLayer->mesh = NULL;
99        mLayer->meshIndices = NULL;
100    }
101
102    if (!mLayer->mesh) {
103        mLayer->mesh = new TextureVertex[count * 4];
104        mLayer->meshIndices = new uint16_t[elementCount];
105        mLayer->meshElementCount = elementCount;
106    }
107
108    const float texX = 1.0f / float(mLayer->width);
109    const float texY = 1.0f / float(mLayer->height);
110    const float height = mLayer->layer.getHeight();
111
112    TextureVertex* mesh = mLayer->mesh;
113    uint16_t* indices = mLayer->meshIndices;
114
115    for (size_t i = 0; i < count; i++) {
116        const android::Rect* r = &rects[i];
117
118        const float u1 = r->left * texX;
119        const float v1 = (height - r->top) * texY;
120        const float u2 = r->right * texX;
121        const float v2 = (height - r->bottom) * texY;
122
123        TextureVertex::set(mesh++, r->left, r->top, u1, v1);
124        TextureVertex::set(mesh++, r->right, r->top, u2, v1);
125        TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
126        TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
127
128        uint16_t quad = i * 4;
129        int index = i * 6;
130        indices[index    ] = quad;       // top-left
131        indices[index + 1] = quad + 1;   // top-right
132        indices[index + 2] = quad + 2;   // bottom-left
133        indices[index + 3] = quad + 2;   // bottom-left
134        indices[index + 4] = quad + 1;   // top-right
135        indices[index + 5] = quad + 3;   // bottom-right
136    }
137#endif
138}
139
140///////////////////////////////////////////////////////////////////////////////
141// Layers management
142///////////////////////////////////////////////////////////////////////////////
143
144Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) {
145    LAYER_RENDERER_LOGD("Creating new layer %dx%d", width, height);
146
147    Layer* layer = new Layer(width, height);
148
149    GLuint previousFbo;
150    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
151
152    glGenFramebuffers(1, &layer->fbo);
153    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
154
155    if (glGetError() != GL_NO_ERROR) {
156        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
157        glDeleteBuffers(1, &layer->fbo);
158        return 0;
159    }
160
161    glActiveTexture(GL_TEXTURE0);
162    glGenTextures(1, &layer->texture);
163    glBindTexture(GL_TEXTURE_2D, layer->texture);
164
165    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
166
167    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
168    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
169
170    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
171    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
172
173    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
174            GL_RGBA, GL_UNSIGNED_BYTE, NULL);
175
176    if (glGetError() != GL_NO_ERROR) {
177        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
178        glDeleteBuffers(1, &layer->fbo);
179        glDeleteTextures(1, &layer->texture);
180        delete layer;
181        return 0;
182    }
183
184    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
185            layer->texture, 0);
186
187    if (glGetError() != GL_NO_ERROR) {
188        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
189        glDeleteBuffers(1, &layer->fbo);
190        glDeleteTextures(1, &layer->texture);
191        delete layer;
192        return 0;
193    }
194
195    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
196
197    layer->layer.set(0.0f, 0.0f, width, height);
198    layer->texCoords.set(0.0f, 1.0f, 1.0f, 0.0f);
199    layer->alpha = 255;
200    layer->mode = SkXfermode::kSrcOver_Mode;
201    layer->blend = !isOpaque;
202    layer->empty = false;
203    layer->colorFilter = NULL;
204
205    return layer;
206}
207
208bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
209    if (layer) {
210        LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->fbo, width, height);
211
212        glActiveTexture(GL_TEXTURE0);
213        glBindTexture(GL_TEXTURE_2D, layer->texture);
214
215        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
216                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
217
218        if (glGetError() != GL_NO_ERROR) {
219            glDeleteBuffers(1, &layer->fbo);
220            glDeleteTextures(1, &layer->texture);
221
222            layer->width = 0;
223            layer->height = 0;
224            layer->fbo = 0;
225            layer->texture = 0;
226
227            return false;
228        }
229
230        layer->width = width;
231        layer->height = height;
232    }
233    return true;
234}
235
236void LayerRenderer::destroyLayer(Layer* layer) {
237    if (layer) {
238        LAYER_RENDERER_LOGD("Destroying layer, fbo = %d", layer->fbo);
239
240        if (layer->fbo) glDeleteFramebuffers(1, &layer->fbo);
241        if (layer->texture) glDeleteTextures(1, &layer->texture);
242
243        delete layer;
244    }
245}
246
247void LayerRenderer::destroyLayerDeferred(Layer* layer) {
248    if (layer) {
249        LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->fbo);
250
251        Caches::getInstance().deleteLayerDeferred(layer);
252    }
253}
254
255}; // namespace uirenderer
256}; // namespace android
257