LayerRenderer.cpp revision 3a3133d876caf60ebff2176ad75c3dcf0259148d 
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        android::Rect r(dirty.left, dirty.top, dirty.right, dirty.bottom);
43        mLayer->region.subtractSelf(r);
44    }
45#endif
46
47    glBindFramebuffer(GL_FRAMEBUFFER, mLayer->fbo);
48
49#if RENDER_LAYERS_AS_REGIONS
50    OpenGLRenderer::prepareDirty(dirty.left, dirty.top, dirty.right, dirty.bottom, opaque);
51#else
52    OpenGLRenderer::prepareDirty(0.0f, 0.0f, mLayer->width, mLayer->height, opaque);
53#endif
54}
55
56void LayerRenderer::finish() {
57    OpenGLRenderer::finish();
58
59    generateMesh();
60
61    LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->fbo);
62
63    // No need to unbind our FBO, this will be taken care of by the caller
64    // who will invoke OpenGLRenderer::resume()
65}
66
67GLint LayerRenderer::getTargetFbo() {
68    return mLayer->fbo;
69}
70
71///////////////////////////////////////////////////////////////////////////////
72// Dirty region tracking
73///////////////////////////////////////////////////////////////////////////////
74
75bool LayerRenderer::hasLayer() {
76    return true;
77}
78
79Region* LayerRenderer::getRegion() {
80#if RENDER_LAYERS_AS_REGIONS
81    if (getSnapshot()->flags & Snapshot::kFlagFboTarget) {
82        return OpenGLRenderer::getRegion();
83    }
84    return &mLayer->region;
85#else
86    return OpenGLRenderer::getRegion();
87#endif
88}
89
90void LayerRenderer::generateMesh() {
91#if RENDER_LAYERS_AS_REGIONS
92    if (mLayer->region.isRect() || mLayer->region.isEmpty()) {
93        if (mLayer->mesh) {
94            delete mLayer->mesh;
95            delete mLayer->meshIndices;
96
97            mLayer->mesh = NULL;
98            mLayer->meshIndices = NULL;
99            mLayer->meshElementCount = 0;
100        }
101        return;
102    }
103
104    size_t count;
105    const android::Rect* rects = mLayer->region.getArray(&count);
106
107    GLsizei elementCount = count * 6;
108
109    if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
110        delete mLayer->mesh;
111        delete mLayer->meshIndices;
112
113        mLayer->mesh = NULL;
114        mLayer->meshIndices = NULL;
115    }
116
117    bool rebuildIndices = false;
118    if (!mLayer->mesh) {
119        mLayer->mesh = new TextureVertex[count * 4];
120        mLayer->meshIndices = new uint16_t[elementCount];
121        rebuildIndices = true;
122    }
123    mLayer->meshElementCount = elementCount;
124
125    const float texX = 1.0f / float(mLayer->width);
126    const float texY = 1.0f / float(mLayer->height);
127    const float height = mLayer->layer.getHeight();
128
129    TextureVertex* mesh = mLayer->mesh;
130    uint16_t* indices = mLayer->meshIndices;
131
132    for (size_t i = 0; i < count; i++) {
133        const android::Rect* r = &rects[i];
134
135        const float u1 = r->left * texX;
136        const float v1 = (height - r->top) * texY;
137        const float u2 = r->right * texX;
138        const float v2 = (height - r->bottom) * texY;
139
140        TextureVertex::set(mesh++, r->left, r->top, u1, v1);
141        TextureVertex::set(mesh++, r->right, r->top, u2, v1);
142        TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
143        TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
144
145        if (rebuildIndices) {
146            uint16_t quad = i * 4;
147            int index = i * 6;
148            indices[index    ] = quad;       // top-left
149            indices[index + 1] = quad + 1;   // top-right
150            indices[index + 2] = quad + 2;   // bottom-left
151            indices[index + 3] = quad + 2;   // bottom-left
152            indices[index + 4] = quad + 1;   // top-right
153            indices[index + 5] = quad + 3;   // bottom-right
154        }
155    }
156#endif
157}
158
159///////////////////////////////////////////////////////////////////////////////
160// Layers management
161///////////////////////////////////////////////////////////////////////////////
162
163Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) {
164    LAYER_RENDERER_LOGD("Creating new layer %dx%d", width, height);
165
166    Layer* layer = new Layer(width, height);
167
168    GLuint previousFbo;
169    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
170
171    glGenFramebuffers(1, &layer->fbo);
172    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
173
174    if (glGetError() != GL_NO_ERROR) {
175        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
176        glDeleteBuffers(1, &layer->fbo);
177        return 0;
178    }
179
180    glActiveTexture(GL_TEXTURE0);
181    glGenTextures(1, &layer->texture);
182    glBindTexture(GL_TEXTURE_2D, layer->texture);
183
184    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
185
186    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
187    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
188
189    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
190    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
191
192    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
193            GL_RGBA, GL_UNSIGNED_BYTE, NULL);
194
195    if (glGetError() != GL_NO_ERROR) {
196        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
197        glDeleteBuffers(1, &layer->fbo);
198        glDeleteTextures(1, &layer->texture);
199        delete layer;
200        return 0;
201    }
202
203    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
204            layer->texture, 0);
205
206    if (glGetError() != GL_NO_ERROR) {
207        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
208        glDeleteBuffers(1, &layer->fbo);
209        glDeleteTextures(1, &layer->texture);
210        delete layer;
211        return 0;
212    }
213
214    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
215
216    layer->layer.set(0.0f, 0.0f, width, height);
217    layer->texCoords.set(0.0f, 1.0f, 1.0f, 0.0f);
218    layer->alpha = 255;
219    layer->mode = SkXfermode::kSrcOver_Mode;
220    layer->blend = !isOpaque;
221    layer->empty = false;
222    layer->colorFilter = NULL;
223
224    return layer;
225}
226
227bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
228    if (layer) {
229        LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->fbo, width, height);
230
231        glActiveTexture(GL_TEXTURE0);
232        glBindTexture(GL_TEXTURE_2D, layer->texture);
233
234        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
235                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
236
237        if (glGetError() != GL_NO_ERROR) {
238            glDeleteBuffers(1, &layer->fbo);
239            glDeleteTextures(1, &layer->texture);
240
241            layer->width = 0;
242            layer->height = 0;
243            layer->fbo = 0;
244            layer->texture = 0;
245
246            return false;
247        }
248
249        layer->width = width;
250        layer->height = height;
251    }
252    return true;
253}
254
255void LayerRenderer::destroyLayer(Layer* layer) {
256    if (layer) {
257        LAYER_RENDERER_LOGD("Destroying layer, fbo = %d", layer->fbo);
258
259        if (layer->fbo) glDeleteFramebuffers(1, &layer->fbo);
260        if (layer->texture) glDeleteTextures(1, &layer->texture);
261
262        delete layer;
263    }
264}
265
266void LayerRenderer::destroyLayerDeferred(Layer* layer) {
267    if (layer) {
268        LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->fbo);
269
270        Caches::getInstance().deleteLayerDeferred(layer);
271    }
272}
273
274}; // namespace uirenderer
275}; // namespace android
276