LayerRenderer.cpp revision ada830f639591b99c3e40de22b07296c7932a33f 
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    LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->mFbo);
43}
44
45///////////////////////////////////////////////////////////////////////////////
46// Static functions
47///////////////////////////////////////////////////////////////////////////////
48
49Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) {
50    LAYER_RENDERER_LOGD("Creating new layer %dx%d", width, height);
51
52    Layer* layer = new Layer(width, height);
53
54    GLuint previousFbo;
55    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
56
57    glGenFramebuffers(1, &layer->fbo);
58    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
59
60    if (glGetError() != GL_NO_ERROR) {
61        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
62        glDeleteBuffers(1, &layer->fbo);
63        return 0;
64    }
65
66    glActiveTexture(GL_TEXTURE0);
67    glGenTextures(1, &layer->texture);
68    glBindTexture(GL_TEXTURE_2D, layer->texture);
69
70    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
71
72    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
73    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
74
75    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
76    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
77
78    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
79            GL_RGBA, GL_UNSIGNED_BYTE, NULL);
80
81    if (glGetError() != GL_NO_ERROR) {
82        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
83        glDeleteBuffers(1, &layer->fbo);
84        glDeleteTextures(1, &layer->texture);
85        delete layer;
86        return 0;
87    }
88
89    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
90            layer->texture, 0);
91
92    if (glGetError() != GL_NO_ERROR) {
93        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
94        glDeleteBuffers(1, &layer->fbo);
95        glDeleteTextures(1, &layer->texture);
96        delete layer;
97        return 0;
98    }
99
100    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
101
102    layer->layer.set(0.0f, 0.0f, width, height);
103    layer->texCoords.set(0.0f, 1.0f, 1.0f, 0.0f);
104    layer->alpha = 255;
105    layer->mode = SkXfermode::kSrcOver_Mode;
106    layer->blend = !isOpaque;
107    layer->empty = false;
108    layer->colorFilter = NULL;
109
110    return layer;
111}
112
113bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
114    if (layer) {
115        LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->fbo, width, height);
116
117        glActiveTexture(GL_TEXTURE0);
118        glBindTexture(GL_TEXTURE_2D, layer->texture);
119
120        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
121                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
122
123        if (glGetError() != GL_NO_ERROR) {
124            glDeleteBuffers(1, &layer->fbo);
125            glDeleteTextures(1, &layer->texture);
126
127            layer->width = 0;
128            layer->height = 0;
129            layer->fbo = 0;
130            layer->texture = 0;
131
132            return false;
133        }
134
135        layer->width = width;
136        layer->height = height;
137    }
138    return true;
139}
140
141void LayerRenderer::destroyLayer(Layer* layer) {
142    if (layer) {
143        LAYER_RENDERER_LOGD("Destroying layer, fbo = %d", layer->fbo);
144
145        if (layer->fbo) glDeleteFramebuffers(1, &layer->fbo);
146        if (layer->texture) glDeleteTextures(1, &layer->texture);
147
148        delete layer;
149    }
150}
151
152void LayerRenderer::destroyLayerDeferred(Layer* layer) {
153    if (layer) {
154        LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->fbo);
155
156        Caches::getInstance().deleteLayerDeferred(layer);
157    }
158}
159
160}; // namespace uirenderer
161}; // namespace android
162