LayerRenderer.cpp revision f219da5e32e85deb442468ee9a63bb28eb198557 
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    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &mPreviousFbo);
37    glBindFramebuffer(GL_FRAMEBUFFER, mLayer->fbo);
38
39    OpenGLRenderer::prepare(opaque);
40}
41
42void LayerRenderer::finish() {
43    OpenGLRenderer::finish();
44    glBindFramebuffer(GL_FRAMEBUFFER, mPreviousFbo);
45
46    generateMesh();
47
48    LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->mFbo);
49}
50
51///////////////////////////////////////////////////////////////////////////////
52// Dirty region tracking
53///////////////////////////////////////////////////////////////////////////////
54
55bool LayerRenderer::hasLayer() {
56    return true;
57}
58
59Region* LayerRenderer::getRegion() {
60#if RENDER_LAYERS_AS_REGIONS
61    if (getSnapshot()->flags & Snapshot::kFlagFboTarget) {
62        return OpenGLRenderer::getRegion();
63    }
64    return &mLayer->region;
65#else
66    return OpenGLRenderer::getRegion();
67#endif
68}
69
70void LayerRenderer::generateMesh() {
71#if RENDER_LAYERS_AS_REGIONS
72    if (mLayer->region.isRect() || mLayer->region.isEmpty()) {
73        if (mLayer->mesh) {
74            delete mLayer->mesh;
75            delete mLayer->meshIndices;
76
77            mLayer->mesh = NULL;
78            mLayer->meshIndices = NULL;
79            mLayer->meshElementCount = 0;
80        }
81        return;
82    }
83
84    size_t count;
85    const android::Rect* rects = mLayer->region.getArray(&count);
86
87    GLsizei elementCount = count * 6;
88
89    if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
90        delete mLayer->mesh;
91        delete mLayer->meshIndices;
92
93        mLayer->mesh = NULL;
94        mLayer->meshIndices = NULL;
95    }
96
97    if (!mLayer->mesh) {
98        mLayer->mesh = new TextureVertex[count * 4];
99        mLayer->meshIndices = new uint16_t[elementCount];
100        mLayer->meshElementCount = elementCount;
101    }
102
103    const float texX = 1.0f / float(mLayer->width);
104    const float texY = 1.0f / float(mLayer->height);
105    const float height = mLayer->layer.getHeight();
106
107    TextureVertex* mesh = mLayer->mesh;
108    uint16_t* indices = mLayer->meshIndices;
109
110    for (size_t i = 0; i < count; i++) {
111        const android::Rect* r = &rects[i];
112
113        const float u1 = r->left * texX;
114        const float v1 = (height - r->top) * texY;
115        const float u2 = r->right * texX;
116        const float v2 = (height - r->bottom) * texY;
117
118        TextureVertex::set(mesh++, r->left, r->top, u1, v1);
119        TextureVertex::set(mesh++, r->right, r->top, u2, v1);
120        TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
121        TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
122
123        uint16_t quad = i * 4;
124        int index = i * 6;
125        indices[index    ] = quad;       // top-left
126        indices[index + 1] = quad + 1;   // top-right
127        indices[index + 2] = quad + 2;   // bottom-left
128        indices[index + 3] = quad + 2;   // bottom-left
129        indices[index + 4] = quad + 1;   // top-right
130        indices[index + 5] = quad + 3;   // bottom-right
131    }
132#endif
133}
134
135///////////////////////////////////////////////////////////////////////////////
136// Layers management
137///////////////////////////////////////////////////////////////////////////////
138
139Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) {
140    LAYER_RENDERER_LOGD("Creating new layer %dx%d", width, height);
141
142    Layer* layer = new Layer(width, height);
143
144    GLuint previousFbo;
145    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
146
147    glGenFramebuffers(1, &layer->fbo);
148    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
149
150    if (glGetError() != GL_NO_ERROR) {
151        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
152        glDeleteBuffers(1, &layer->fbo);
153        return 0;
154    }
155
156    glActiveTexture(GL_TEXTURE0);
157    glGenTextures(1, &layer->texture);
158    glBindTexture(GL_TEXTURE_2D, layer->texture);
159
160    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
161
162    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
163    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
164
165    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
166    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
167
168    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
169            GL_RGBA, GL_UNSIGNED_BYTE, NULL);
170
171    if (glGetError() != GL_NO_ERROR) {
172        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
173        glDeleteBuffers(1, &layer->fbo);
174        glDeleteTextures(1, &layer->texture);
175        delete layer;
176        return 0;
177    }
178
179    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
180            layer->texture, 0);
181
182    if (glGetError() != GL_NO_ERROR) {
183        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
184        glDeleteBuffers(1, &layer->fbo);
185        glDeleteTextures(1, &layer->texture);
186        delete layer;
187        return 0;
188    }
189
190    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
191
192    layer->layer.set(0.0f, 0.0f, width, height);
193    layer->texCoords.set(0.0f, 1.0f, 1.0f, 0.0f);
194    layer->alpha = 255;
195    layer->mode = SkXfermode::kSrcOver_Mode;
196    layer->blend = !isOpaque;
197    layer->empty = false;
198    layer->colorFilter = NULL;
199
200    return layer;
201}
202
203bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
204    if (layer) {
205        LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->fbo, width, height);
206
207        glActiveTexture(GL_TEXTURE0);
208        glBindTexture(GL_TEXTURE_2D, layer->texture);
209
210        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
211                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
212
213        if (glGetError() != GL_NO_ERROR) {
214            glDeleteBuffers(1, &layer->fbo);
215            glDeleteTextures(1, &layer->texture);
216
217            layer->width = 0;
218            layer->height = 0;
219            layer->fbo = 0;
220            layer->texture = 0;
221
222            return false;
223        }
224
225        layer->width = width;
226        layer->height = height;
227    }
228    return true;
229}
230
231void LayerRenderer::destroyLayer(Layer* layer) {
232    if (layer) {
233        LAYER_RENDERER_LOGD("Destroying layer, fbo = %d", layer->fbo);
234
235        if (layer->fbo) glDeleteFramebuffers(1, &layer->fbo);
236        if (layer->texture) glDeleteTextures(1, &layer->texture);
237
238        delete layer;
239    }
240}
241
242void LayerRenderer::destroyLayerDeferred(Layer* layer) {
243    if (layer) {
244        LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->fbo);
245
246        Caches::getInstance().deleteLayerDeferred(layer);
247    }
248}
249
250}; // namespace uirenderer
251}; // namespace android
252