LayerRenderer.cpp revision beff8d83ef062975459f149ad0c632a3797d78ce 
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 "LayerRenderer.h"
22#include "Properties.h"
23#include "Rect.h"
24
25namespace android {
26namespace uirenderer {
27
28///////////////////////////////////////////////////////////////////////////////
29// Rendering
30///////////////////////////////////////////////////////////////////////////////
31
32void LayerRenderer::prepareDirty(float left, float top, float right, float bottom, bool opaque) {
33    LAYER_RENDERER_LOGD("Rendering into layer, fbo = %d", mLayer->fbo);
34
35#if RENDER_LAYERS_AS_REGIONS
36    Rect dirty(left, top, right, bottom);
37    if (dirty.isEmpty() || (dirty.left <= 0 && dirty.top <= 0 &&
38            dirty.right >= mLayer->width && dirty.bottom >= mLayer->height)) {
39        mLayer->region.clear();
40        dirty.set(0.0f, 0.0f, mLayer->width, mLayer->height);
41    } else {
42        dirty.intersect(0.0f, 0.0f, mLayer->width, mLayer->height);
43        android::Rect r(dirty.left, dirty.top, dirty.right, dirty.bottom);
44        mLayer->region.subtractSelf(r);
45    }
46#endif
47
48    glBindFramebuffer(GL_FRAMEBUFFER, mLayer->fbo);
49
50#if RENDER_LAYERS_AS_REGIONS
51    OpenGLRenderer::prepareDirty(dirty.left, dirty.top, dirty.right, dirty.bottom, opaque);
52#else
53    OpenGLRenderer::prepareDirty(0.0f, 0.0f, mLayer->width, mLayer->height, opaque);
54#endif
55}
56
57void LayerRenderer::finish() {
58    OpenGLRenderer::finish();
59
60    generateMesh();
61
62    LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->fbo);
63
64    // No need to unbind our FBO, this will be taken care of by the caller
65    // who will invoke OpenGLRenderer::resume()
66}
67
68GLint LayerRenderer::getTargetFbo() {
69    return mLayer->fbo;
70}
71
72///////////////////////////////////////////////////////////////////////////////
73// Dirty region tracking
74///////////////////////////////////////////////////////////////////////////////
75
76bool LayerRenderer::hasLayer() {
77    return true;
78}
79
80Region* LayerRenderer::getRegion() {
81#if RENDER_LAYERS_AS_REGIONS
82    if (getSnapshot()->flags & Snapshot::kFlagFboTarget) {
83        return OpenGLRenderer::getRegion();
84    }
85    return &mLayer->region;
86#else
87    return OpenGLRenderer::getRegion();
88#endif
89}
90
91void LayerRenderer::generateMesh() {
92#if RENDER_LAYERS_AS_REGIONS
93    if (mLayer->region.isRect() || mLayer->region.isEmpty()) {
94        if (mLayer->mesh) {
95            delete mLayer->mesh;
96            delete mLayer->meshIndices;
97
98            mLayer->mesh = NULL;
99            mLayer->meshIndices = NULL;
100            mLayer->meshElementCount = 0;
101        }
102        return;
103    }
104
105    size_t count;
106    const android::Rect* rects = mLayer->region.getArray(&count);
107
108    GLsizei elementCount = count * 6;
109
110    if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
111        delete mLayer->mesh;
112        delete mLayer->meshIndices;
113
114        mLayer->mesh = NULL;
115        mLayer->meshIndices = NULL;
116    }
117
118    bool rebuildIndices = false;
119    if (!mLayer->mesh) {
120        mLayer->mesh = new TextureVertex[count * 4];
121        mLayer->meshIndices = new uint16_t[elementCount];
122        rebuildIndices = true;
123    }
124    mLayer->meshElementCount = elementCount;
125
126    const float texX = 1.0f / float(mLayer->width);
127    const float texY = 1.0f / float(mLayer->height);
128    const float height = mLayer->layer.getHeight();
129
130    TextureVertex* mesh = mLayer->mesh;
131    uint16_t* indices = mLayer->meshIndices;
132
133    for (size_t i = 0; i < count; i++) {
134        const android::Rect* r = &rects[i];
135
136        const float u1 = r->left * texX;
137        const float v1 = (height - r->top) * texY;
138        const float u2 = r->right * texX;
139        const float v2 = (height - r->bottom) * texY;
140
141        TextureVertex::set(mesh++, r->left, r->top, u1, v1);
142        TextureVertex::set(mesh++, r->right, r->top, u2, v1);
143        TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
144        TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
145
146        if (rebuildIndices) {
147            uint16_t quad = i * 4;
148            int index = i * 6;
149            indices[index    ] = quad;       // top-left
150            indices[index + 1] = quad + 1;   // top-right
151            indices[index + 2] = quad + 2;   // bottom-left
152            indices[index + 3] = quad + 2;   // bottom-left
153            indices[index + 4] = quad + 1;   // top-right
154            indices[index + 5] = quad + 3;   // bottom-right
155        }
156    }
157#endif
158}
159
160///////////////////////////////////////////////////////////////////////////////
161// Layers management
162///////////////////////////////////////////////////////////////////////////////
163
164Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) {
165    LAYER_RENDERER_LOGD("Creating new layer %dx%d", width, height);
166
167    Layer* layer = new Layer(width, height);
168
169    GLuint previousFbo;
170    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
171
172    glGenFramebuffers(1, &layer->fbo);
173    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
174
175    if (glGetError() != GL_NO_ERROR) {
176        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
177        glDeleteBuffers(1, &layer->fbo);
178        return 0;
179    }
180
181    glActiveTexture(GL_TEXTURE0);
182    glGenTextures(1, &layer->texture);
183    glBindTexture(GL_TEXTURE_2D, layer->texture);
184
185    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
186
187    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
188    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
189
190    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
191    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
192
193    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
194            GL_RGBA, GL_UNSIGNED_BYTE, NULL);
195
196    if (glGetError() != GL_NO_ERROR) {
197        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
198        glDeleteBuffers(1, &layer->fbo);
199        glDeleteTextures(1, &layer->texture);
200        delete layer;
201        return 0;
202    }
203
204    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
205            layer->texture, 0);
206
207    if (glGetError() != GL_NO_ERROR) {
208        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
209        glDeleteBuffers(1, &layer->fbo);
210        glDeleteTextures(1, &layer->texture);
211        delete layer;
212        return 0;
213    }
214
215    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
216
217    layer->layer.set(0.0f, 0.0f, width, height);
218    layer->texCoords.set(0.0f, 1.0f, 1.0f, 0.0f);
219    layer->alpha = 255;
220    layer->mode = SkXfermode::kSrcOver_Mode;
221    layer->blend = !isOpaque;
222    layer->empty = false;
223    layer->colorFilter = NULL;
224
225    return layer;
226}
227
228bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
229    if (layer) {
230        LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->fbo, width, height);
231
232        glActiveTexture(GL_TEXTURE0);
233        glBindTexture(GL_TEXTURE_2D, layer->texture);
234
235        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
236                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
237
238        if (glGetError() != GL_NO_ERROR) {
239            glDeleteBuffers(1, &layer->fbo);
240            glDeleteTextures(1, &layer->texture);
241
242            layer->width = 0;
243            layer->height = 0;
244            layer->fbo = 0;
245            layer->texture = 0;
246
247            return false;
248        }
249
250        layer->width = width;
251        layer->height = height;
252    }
253    return true;
254}
255
256void LayerRenderer::destroyLayer(Layer* layer) {
257    if (layer) {
258        LAYER_RENDERER_LOGD("Destroying layer, fbo = %d", layer->fbo);
259
260        if (layer->fbo) glDeleteFramebuffers(1, &layer->fbo);
261        if (layer->texture) glDeleteTextures(1, &layer->texture);
262
263        delete layer;
264    }
265}
266
267void LayerRenderer::destroyLayerDeferred(Layer* layer) {
268    if (layer) {
269        LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->fbo);
270
271        Caches::getInstance().deleteLayerDeferred(layer);
272    }
273}
274
275}; // namespace uirenderer
276}; // namespace android
277