LayerRenderer.cpp revision aa6c24c21c727a196451332448d4e3b11a80be69 
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 "Matrix.h"
24#include "Properties.h"
25#include "Rect.h"
26
27namespace android {
28namespace uirenderer {
29
30///////////////////////////////////////////////////////////////////////////////
31// Rendering
32///////////////////////////////////////////////////////////////////////////////
33
34void LayerRenderer::prepareDirty(float left, float top, float right, float bottom, bool opaque) {
35    LAYER_RENDERER_LOGD("Rendering into layer, fbo = %d", mLayer->fbo);
36
37    glBindFramebuffer(GL_FRAMEBUFFER, mLayer->fbo);
38
39    const float width = mLayer->layer.getWidth();
40    const float height = mLayer->layer.getHeight();
41
42#if RENDER_LAYERS_AS_REGIONS
43    Rect dirty(left, top, right, bottom);
44    if (dirty.isEmpty() || (dirty.left <= 0 && dirty.top <= 0 &&
45            dirty.right >= width && dirty.bottom >= height)) {
46        mLayer->region.clear();
47        dirty.set(0.0f, 0.0f, width, height);
48    } else {
49        dirty.intersect(0.0f, 0.0f, width, height);
50        android::Rect r(dirty.left, dirty.top, dirty.right, dirty.bottom);
51        mLayer->region.subtractSelf(r);
52    }
53
54    OpenGLRenderer::prepareDirty(dirty.left, dirty.top, dirty.right, dirty.bottom, opaque);
55#else
56    OpenGLRenderer::prepareDirty(0.0f, 0.0f, width, height, opaque);
57#endif
58}
59
60void LayerRenderer::finish() {
61    OpenGLRenderer::finish();
62
63    generateMesh();
64
65    LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->fbo);
66
67    // No need to unbind our FBO, this will be taken care of by the caller
68    // who will invoke OpenGLRenderer::resume()
69}
70
71GLint LayerRenderer::getTargetFbo() {
72    return mLayer->fbo;
73}
74
75///////////////////////////////////////////////////////////////////////////////
76// Dirty region tracking
77///////////////////////////////////////////////////////////////////////////////
78
79bool LayerRenderer::hasLayer() {
80    return true;
81}
82
83Region* LayerRenderer::getRegion() {
84#if RENDER_LAYERS_AS_REGIONS
85    if (getSnapshot()->flags & Snapshot::kFlagFboTarget) {
86        return OpenGLRenderer::getRegion();
87    }
88    return &mLayer->region;
89#else
90    return OpenGLRenderer::getRegion();
91#endif
92}
93
94void LayerRenderer::generateMesh() {
95#if RENDER_LAYERS_AS_REGIONS
96    if (mLayer->region.isRect() || mLayer->region.isEmpty()) {
97        if (mLayer->mesh) {
98            delete mLayer->mesh;
99            delete mLayer->meshIndices;
100
101            mLayer->mesh = NULL;
102            mLayer->meshIndices = NULL;
103            mLayer->meshElementCount = 0;
104        }
105
106        mLayer->setRegionAsRect();
107        return;
108    }
109
110    size_t count;
111    const android::Rect* rects = mLayer->region.getArray(&count);
112
113    GLsizei elementCount = count * 6;
114
115    if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
116        delete mLayer->mesh;
117        delete mLayer->meshIndices;
118
119        mLayer->mesh = NULL;
120        mLayer->meshIndices = NULL;
121    }
122
123    bool rebuildIndices = false;
124    if (!mLayer->mesh) {
125        mLayer->mesh = new TextureVertex[count * 4];
126        mLayer->meshIndices = new uint16_t[elementCount];
127        rebuildIndices = true;
128    }
129    mLayer->meshElementCount = elementCount;
130
131    const float texX = 1.0f / float(mLayer->width);
132    const float texY = 1.0f / float(mLayer->height);
133    const float height = mLayer->layer.getHeight();
134
135    TextureVertex* mesh = mLayer->mesh;
136    uint16_t* indices = mLayer->meshIndices;
137
138    for (size_t i = 0; i < count; i++) {
139        const android::Rect* r = &rects[i];
140
141        const float u1 = r->left * texX;
142        const float v1 = (height - r->top) * texY;
143        const float u2 = r->right * texX;
144        const float v2 = (height - r->bottom) * texY;
145
146        TextureVertex::set(mesh++, r->left, r->top, u1, v1);
147        TextureVertex::set(mesh++, r->right, r->top, u2, v1);
148        TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
149        TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
150
151        if (rebuildIndices) {
152            uint16_t quad = i * 4;
153            int index = i * 6;
154            indices[index    ] = quad;       // top-left
155            indices[index + 1] = quad + 1;   // top-right
156            indices[index + 2] = quad + 2;   // bottom-left
157            indices[index + 3] = quad + 2;   // bottom-left
158            indices[index + 4] = quad + 1;   // top-right
159            indices[index + 5] = quad + 3;   // bottom-right
160        }
161    }
162#endif
163}
164
165///////////////////////////////////////////////////////////////////////////////
166// Layers management
167///////////////////////////////////////////////////////////////////////////////
168
169Layer* LayerRenderer::createTextureLayer() {
170    LAYER_RENDERER_LOGD("Creating new texture layer");
171
172    Layer* layer = new Layer(0, 0);
173    layer->isCacheable = false;
174    layer->isTextureLayer = true;
175    layer->blend = true;
176    layer->empty = true;
177    layer->fbo = 0;
178    layer->colorFilter = NULL;
179    layer->fbo = 0;
180    layer->layer.set(0.0f, 0.0f, 0.0f, 0.0f);
181    layer->texCoords.set(0.0f, 1.0f, 0.0f, 1.0f);
182    layer->alpha = 255;
183    layer->mode = SkXfermode::kSrcOver_Mode;
184    layer->colorFilter = NULL;
185    layer->region.clear();
186
187    glActiveTexture(GL_TEXTURE0);
188
189    glGenTextures(1, &layer->texture);
190    glBindTexture(GL_TEXTURE_EXTERNAL_OES, layer->texture);
191
192    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
193
194    glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
195    glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
196
197    glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
198    glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
199
200    return layer;
201}
202
203Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) {
204    LAYER_RENDERER_LOGD("Creating new layer %dx%d", width, height);
205
206    GLuint fbo = Caches::getInstance().fboCache.get();
207    if (!fbo) {
208        LOGW("Could not obtain an FBO");
209        return NULL;
210    }
211
212    glActiveTexture(GL_TEXTURE0);
213    Layer* layer = Caches::getInstance().layerCache.get(width, height);
214    if (!layer) {
215        LOGW("Could not obtain a layer");
216        return NULL;
217    }
218
219    layer->fbo = fbo;
220    layer->layer.set(0.0f, 0.0f, width, height);
221    layer->texCoords.set(0.0f, height / float(layer->height),
222            width / float(layer->width), 0.0f);
223    layer->alpha = 255;
224    layer->mode = SkXfermode::kSrcOver_Mode;
225    layer->blend = !isOpaque;
226    layer->colorFilter = NULL;
227    layer->region.clear();
228
229    GLuint previousFbo;
230    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
231
232    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
233    glBindTexture(GL_TEXTURE_2D, layer->texture);
234
235    // Initialize the texture if needed
236    if (layer->empty) {
237        layer->empty = false;
238        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, layer->width, layer->height, 0,
239                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
240
241        if (glGetError() != GL_NO_ERROR) {
242            LOGD("Could not allocate texture");
243            glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
244            glDeleteTextures(1, &layer->texture);
245            Caches::getInstance().fboCache.put(fbo);
246            delete layer;
247            return NULL;
248        }
249    }
250
251    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
252            layer->texture, 0);
253
254    glDisable(GL_SCISSOR_TEST);
255    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
256    glClear(GL_COLOR_BUFFER_BIT);
257    glEnable(GL_SCISSOR_TEST);
258
259    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
260
261    return layer;
262}
263
264bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
265    if (layer) {
266        LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->fbo, width, height);
267
268        if (Caches::getInstance().layerCache.resize(layer, width, height)) {
269            layer->layer.set(0.0f, 0.0f, width, height);
270            layer->texCoords.set(0.0f, height / float(layer->height),
271                    width / float(layer->width), 0.0f);
272        } else {
273            if (layer->texture) glDeleteTextures(1, &layer->texture);
274            delete layer;
275            return false;
276        }
277    }
278
279    return true;
280}
281
282void LayerRenderer::updateTextureLayer(Layer* layer, uint32_t width, uint32_t height,
283        float* transform) {
284    if (layer) {
285        layer->width = width;
286        layer->height = height;
287        layer->layer.set(0.0f, 0.0f, width, height);
288        layer->region.set(width, height);
289        layer->regionRect.set(0.0f, 0.0f, width, height);
290        layer->texTransform.load(transform);
291    }
292}
293
294void LayerRenderer::destroyLayer(Layer* layer) {
295    if (layer) {
296        LAYER_RENDERER_LOGD("Destroying layer, fbo = %d", layer->fbo);
297
298        if (layer->fbo) {
299            Caches::getInstance().fboCache.put(layer->fbo);
300        }
301
302        if (!Caches::getInstance().layerCache.put(layer)) {
303            if (layer->texture) glDeleteTextures(1, &layer->texture);
304            delete layer;
305        } else {
306            layer->region.clear();
307        }
308    }
309}
310
311void LayerRenderer::destroyLayerDeferred(Layer* layer) {
312    if (layer) {
313        LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->fbo);
314
315        Caches::getInstance().deleteLayerDeferred(layer);
316    }
317}
318
319}; // namespace uirenderer
320}; // namespace android
321