LayerRenderer.cpp revision fb13abd800cd610c7f46815848545feff83e5748 
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    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &mPreviousFbo);
33    glBindFramebuffer(GL_FRAMEBUFFER, mLayer->fbo);
34
35    OpenGLRenderer::prepare(opaque);
36}
37
38void LayerRenderer::finish() {
39    OpenGLRenderer::finish();
40    glBindFramebuffer(GL_FRAMEBUFFER, mPreviousFbo);
41
42    generateMesh();
43
44    LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->mFbo);
45}
46
47///////////////////////////////////////////////////////////////////////////////
48// Dirty region tracking
49///////////////////////////////////////////////////////////////////////////////
50
51bool LayerRenderer::hasLayer() {
52    return true;
53}
54
55Region* LayerRenderer::getRegion() {
56#if RENDER_LAYERS_AS_REGIONS
57    if (getSnapshot()->flags & Snapshot::kFlagFboTarget) {
58        return OpenGLRenderer::getRegion();
59    }
60    return &mLayer->region;
61#else
62    return OpenGLRenderer::getRegion();
63#endif
64}
65
66void LayerRenderer::generateMesh() {
67#if RENDER_LAYERS_AS_REGIONS
68    if (mLayer->region.isRect() || mLayer->region.isEmpty()) {
69        if (mLayer->mesh) {
70            delete mLayer->mesh;
71            delete mLayer->meshIndices;
72
73            mLayer->mesh = NULL;
74            mLayer->meshIndices = NULL;
75            mLayer->meshElementCount = 0;
76        }
77        mLayer->region.clear();
78        return;
79    }
80
81    size_t count;
82    const android::Rect* rects = mLayer->region.getArray(&count);
83
84    GLsizei elementCount = count * 6;
85
86    if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
87        delete mLayer->mesh;
88        delete mLayer->meshIndices;
89
90        mLayer->mesh = NULL;
91        mLayer->meshIndices = NULL;
92    }
93
94    if (!mLayer->mesh) {
95        mLayer->mesh = new TextureVertex[count * 4];
96        mLayer->meshIndices = new uint16_t[elementCount];
97        mLayer->meshElementCount = elementCount;
98    }
99
100    const float texX = 1.0f / float(mLayer->width);
101    const float texY = 1.0f / float(mLayer->height);
102    const float height = mLayer->layer.getHeight();
103
104    TextureVertex* mesh = mLayer->mesh;
105    uint16_t* indices = mLayer->meshIndices;
106
107    for (size_t i = 0; i < count; i++) {
108        const android::Rect* r = &rects[i];
109
110        const float u1 = r->left * texX;
111        const float v1 = (height - r->top) * texY;
112        const float u2 = r->right * texX;
113        const float v2 = (height - r->bottom) * texY;
114
115        TextureVertex::set(mesh++, r->left, r->top, u1, v1);
116        TextureVertex::set(mesh++, r->right, r->top, u2, v1);
117        TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
118        TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
119
120        uint16_t quad = i * 4;
121        int index = i * 6;
122        indices[index    ] = quad;       // top-left
123        indices[index + 1] = quad + 1;   // top-right
124        indices[index + 2] = quad + 2;   // bottom-left
125        indices[index + 3] = quad + 2;   // bottom-left
126        indices[index + 4] = quad + 1;   // top-right
127        indices[index + 5] = quad + 3;   // bottom-right
128    }
129
130    mLayer->region.clear();
131#endif
132}
133
134///////////////////////////////////////////////////////////////////////////////
135// Layers management
136///////////////////////////////////////////////////////////////////////////////
137
138Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) {
139    LAYER_RENDERER_LOGD("Creating new layer %dx%d", width, height);
140
141    Layer* layer = new Layer(width, height);
142
143    GLuint previousFbo;
144    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
145
146    glGenFramebuffers(1, &layer->fbo);
147    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
148
149    if (glGetError() != GL_NO_ERROR) {
150        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
151        glDeleteBuffers(1, &layer->fbo);
152        return 0;
153    }
154
155    glActiveTexture(GL_TEXTURE0);
156    glGenTextures(1, &layer->texture);
157    glBindTexture(GL_TEXTURE_2D, layer->texture);
158
159    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
160
161    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
162    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
163
164    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
165    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
166
167    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
168            GL_RGBA, GL_UNSIGNED_BYTE, NULL);
169
170    if (glGetError() != GL_NO_ERROR) {
171        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
172        glDeleteBuffers(1, &layer->fbo);
173        glDeleteTextures(1, &layer->texture);
174        delete layer;
175        return 0;
176    }
177
178    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
179            layer->texture, 0);
180
181    if (glGetError() != GL_NO_ERROR) {
182        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
183        glDeleteBuffers(1, &layer->fbo);
184        glDeleteTextures(1, &layer->texture);
185        delete layer;
186        return 0;
187    }
188
189    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
190
191    layer->layer.set(0.0f, 0.0f, width, height);
192    layer->texCoords.set(0.0f, 1.0f, 1.0f, 0.0f);
193    layer->alpha = 255;
194    layer->mode = SkXfermode::kSrcOver_Mode;
195    layer->blend = !isOpaque;
196    layer->empty = false;
197    layer->colorFilter = NULL;
198
199    return layer;
200}
201
202bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
203    if (layer) {
204        LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->fbo, width, height);
205
206        glActiveTexture(GL_TEXTURE0);
207        glBindTexture(GL_TEXTURE_2D, layer->texture);
208
209        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
210                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
211
212        if (glGetError() != GL_NO_ERROR) {
213            glDeleteBuffers(1, &layer->fbo);
214            glDeleteTextures(1, &layer->texture);
215
216            layer->width = 0;
217            layer->height = 0;
218            layer->fbo = 0;
219            layer->texture = 0;
220
221            return false;
222        }
223
224        layer->width = width;
225        layer->height = height;
226    }
227    return true;
228}
229
230void LayerRenderer::destroyLayer(Layer* layer) {
231    if (layer) {
232        LAYER_RENDERER_LOGD("Destroying layer, fbo = %d", layer->fbo);
233
234        if (layer->fbo) glDeleteFramebuffers(1, &layer->fbo);
235        if (layer->texture) glDeleteTextures(1, &layer->texture);
236
237        delete layer;
238    }
239}
240
241void LayerRenderer::destroyLayerDeferred(Layer* layer) {
242    if (layer) {
243        LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->fbo);
244
245        Caches::getInstance().deleteLayerDeferred(layer);
246    }
247}
248
249}; // namespace uirenderer
250}; // namespace android
251