LayerRenderer.cpp revision 1fc883b271707c4206ae20cc9a935d7bd4a7485e 
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", mFbo);
31
32    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &mPreviousFbo);
33    glBindFramebuffer(GL_FRAMEBUFFER, mFbo);
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", mFbo);
43}
44
45///////////////////////////////////////////////////////////////////////////////
46// Static functions
47///////////////////////////////////////////////////////////////////////////////
48
49GLuint LayerRenderer::createLayer(uint32_t width, uint32_t height,
50        uint32_t* layerWidth, uint32_t* layerHeight, GLuint* texture) {
51    LAYER_RENDERER_LOGD("Creating new layer %dx%d", width, height);
52
53    GLuint previousFbo;
54    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
55
56    GLuint fbo = 0;
57    glGenFramebuffers(1, &fbo);
58    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
59
60    if (glGetError() != GL_NO_ERROR) {
61        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
62        glDeleteBuffers(1, &fbo);
63        return 0;
64    }
65
66    glActiveTexture(GL_TEXTURE0);
67    glGenTextures(1, texture);
68    glBindTexture(GL_TEXTURE_2D, *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, &fbo);
84        glDeleteTextures(1, texture);
85        return 0;
86    }
87
88    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
89                *texture, 0);
90
91    if (glGetError() != GL_NO_ERROR) {
92        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
93        glDeleteBuffers(1, &fbo);
94        glDeleteTextures(1, texture);
95        return 0;
96    }
97
98    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
99
100    *layerWidth = width;
101    *layerHeight = height;
102
103    return fbo;
104}
105
106void LayerRenderer::resizeLayer(GLuint fbo, GLuint texture, uint32_t width, uint32_t height,
107        uint32_t* layerWidth, uint32_t* layerHeight) {
108    LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", fbo, width, height);
109
110    glActiveTexture(GL_TEXTURE0);
111    glBindTexture(GL_TEXTURE_2D, texture);
112
113    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
114            GL_RGBA, GL_UNSIGNED_BYTE, NULL);
115
116    if (glGetError() != GL_NO_ERROR) {
117        glDeleteBuffers(1, &fbo);
118        glDeleteTextures(1, &texture);
119
120        *layerWidth = 0;
121        *layerHeight = 0;
122
123        return;
124    }
125
126    *layerWidth = width;
127    *layerHeight = height;
128}
129
130void LayerRenderer::destroyLayer(GLuint fbo, GLuint texture) {
131    LAYER_RENDERER_LOGD("Destroying layer, fbo = %d", fbo);
132
133    if (fbo) glDeleteFramebuffers(1, &fbo);
134    if (texture) glDeleteTextures(1, &texture);
135}
136
137void LayerRenderer::destroyLayerDeferred(GLuint fbo, GLuint texture) {
138    LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", fbo);
139
140    Caches& caches = Caches::getInstance();
141    if (fbo) caches.deleteFboDeferred(fbo);
142    if (texture) caches.deleteTextureDeferred(texture);
143}
144
145}; // namespace uirenderer
146}; // namespace android
147