LayerRenderer.cpp revision 62687ec12cb8e0b1d4044a235b1387b9a8c3b4b4 
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    glBindFramebuffer(GL_FRAMEBUFFER, mLayer->fbo);
36
37#if RENDER_LAYERS_AS_REGIONS
38    Rect dirty(left, top, right, bottom);
39    if (dirty.isEmpty() || (dirty.left <= 0 && dirty.top <= 0 &&
40            dirty.right >= mLayer->width && dirty.bottom >= mLayer->height)) {
41        mLayer->region.clear();
42        dirty.set(0.0f, 0.0f, mLayer->width, mLayer->height);
43    } else {
44        dirty.intersect(0.0f, 0.0f, mLayer->width, mLayer->height);
45        android::Rect r(dirty.left, dirty.top, dirty.right, dirty.bottom);
46        mLayer->region.subtractSelf(r);
47    }
48
49    OpenGLRenderer::prepareDirty(dirty.left, dirty.top, dirty.right, dirty.bottom, opaque);
50#else
51    OpenGLRenderer::prepareDirty(0.0f, 0.0f, mLayer->width, mLayer->height, opaque);
52#endif
53}
54
55void LayerRenderer::finish() {
56    OpenGLRenderer::finish();
57
58    generateMesh();
59
60    LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->fbo);
61
62    // No need to unbind our FBO, this will be taken care of by the caller
63    // who will invoke OpenGLRenderer::resume()
64}
65
66GLint LayerRenderer::getTargetFbo() {
67    return mLayer->fbo;
68}
69
70///////////////////////////////////////////////////////////////////////////////
71// Dirty region tracking
72///////////////////////////////////////////////////////////////////////////////
73
74bool LayerRenderer::hasLayer() {
75    return true;
76}
77
78Region* LayerRenderer::getRegion() {
79#if RENDER_LAYERS_AS_REGIONS
80    if (getSnapshot()->flags & Snapshot::kFlagFboTarget) {
81        return OpenGLRenderer::getRegion();
82    }
83    return &mLayer->region;
84#else
85    return OpenGLRenderer::getRegion();
86#endif
87}
88
89void LayerRenderer::generateMesh() {
90#if RENDER_LAYERS_AS_REGIONS
91    if (mLayer->region.isRect() || mLayer->region.isEmpty()) {
92        if (mLayer->mesh) {
93            delete mLayer->mesh;
94            delete mLayer->meshIndices;
95
96            mLayer->mesh = NULL;
97            mLayer->meshIndices = NULL;
98            mLayer->meshElementCount = 0;
99        }
100        return;
101    }
102
103    size_t count;
104    const android::Rect* rects = mLayer->region.getArray(&count);
105
106    GLsizei elementCount = count * 6;
107
108    if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
109        delete mLayer->mesh;
110        delete mLayer->meshIndices;
111
112        mLayer->mesh = NULL;
113        mLayer->meshIndices = NULL;
114    }
115
116    bool rebuildIndices = false;
117    if (!mLayer->mesh) {
118        mLayer->mesh = new TextureVertex[count * 4];
119        mLayer->meshIndices = new uint16_t[elementCount];
120        rebuildIndices = true;
121    }
122    mLayer->meshElementCount = elementCount;
123
124    const float texX = 1.0f / float(mLayer->width);
125    const float texY = 1.0f / float(mLayer->height);
126    const float height = mLayer->layer.getHeight();
127
128    TextureVertex* mesh = mLayer->mesh;
129    uint16_t* indices = mLayer->meshIndices;
130
131    for (size_t i = 0; i < count; i++) {
132        const android::Rect* r = &rects[i];
133
134        const float u1 = r->left * texX;
135        const float v1 = (height - r->top) * texY;
136        const float u2 = r->right * texX;
137        const float v2 = (height - r->bottom) * texY;
138
139        TextureVertex::set(mesh++, r->left, r->top, u1, v1);
140        TextureVertex::set(mesh++, r->right, r->top, u2, v1);
141        TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
142        TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
143
144        if (rebuildIndices) {
145            uint16_t quad = i * 4;
146            int index = i * 6;
147            indices[index    ] = quad;       // top-left
148            indices[index + 1] = quad + 1;   // top-right
149            indices[index + 2] = quad + 2;   // bottom-left
150            indices[index + 3] = quad + 2;   // bottom-left
151            indices[index + 4] = quad + 1;   // top-right
152            indices[index + 5] = quad + 3;   // bottom-right
153        }
154    }
155#endif
156}
157
158///////////////////////////////////////////////////////////////////////////////
159// Layers management
160///////////////////////////////////////////////////////////////////////////////
161
162Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) {
163    LAYER_RENDERER_LOGD("Creating new layer %dx%d", width, height);
164
165    Layer* layer = new Layer(width, height);
166
167    GLuint previousFbo;
168    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
169
170    glGenFramebuffers(1, &layer->fbo);
171    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
172
173    if (glGetError() != GL_NO_ERROR) {
174        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
175        glDeleteBuffers(1, &layer->fbo);
176        return 0;
177    }
178
179    glActiveTexture(GL_TEXTURE0);
180    glGenTextures(1, &layer->texture);
181    glBindTexture(GL_TEXTURE_2D, layer->texture);
182
183    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
184
185    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
186    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
187
188    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
189    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
190
191    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
192            GL_RGBA, GL_UNSIGNED_BYTE, NULL);
193
194    if (glGetError() != GL_NO_ERROR) {
195        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
196        glDeleteBuffers(1, &layer->fbo);
197        glDeleteTextures(1, &layer->texture);
198        delete layer;
199        return 0;
200    }
201
202    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
203            layer->texture, 0);
204
205    if (glGetError() != GL_NO_ERROR) {
206        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
207        glDeleteBuffers(1, &layer->fbo);
208        glDeleteTextures(1, &layer->texture);
209        delete layer;
210        return 0;
211    }
212
213    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
214
215    layer->layer.set(0.0f, 0.0f, width, height);
216    layer->texCoords.set(0.0f, 1.0f, 1.0f, 0.0f);
217    layer->alpha = 255;
218    layer->mode = SkXfermode::kSrcOver_Mode;
219    layer->blend = !isOpaque;
220    layer->empty = false;
221    layer->colorFilter = NULL;
222
223    return layer;
224}
225
226bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
227    if (layer) {
228        LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->fbo, width, height);
229
230        glActiveTexture(GL_TEXTURE0);
231        glBindTexture(GL_TEXTURE_2D, layer->texture);
232
233        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
234                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
235
236        if (glGetError() != GL_NO_ERROR) {
237            glDeleteBuffers(1, &layer->fbo);
238            glDeleteTextures(1, &layer->texture);
239
240            layer->width = 0;
241            layer->height = 0;
242            layer->fbo = 0;
243            layer->texture = 0;
244
245            return false;
246        }
247
248        layer->width = width;
249        layer->height = height;
250    }
251    return true;
252}
253
254void LayerRenderer::destroyLayer(Layer* layer) {
255    if (layer) {
256        LAYER_RENDERER_LOGD("Destroying layer, fbo = %d", layer->fbo);
257
258        if (layer->fbo) glDeleteFramebuffers(1, &layer->fbo);
259        if (layer->texture) glDeleteTextures(1, &layer->texture);
260
261        delete layer;
262    }
263}
264
265void LayerRenderer::destroyLayerDeferred(Layer* layer) {
266    if (layer) {
267        LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->fbo);
268
269        Caches::getInstance().deleteLayerDeferred(layer);
270    }
271}
272
273}; // namespace uirenderer
274}; // namespace android
275