PixelBuffer.cpp revision 9e6f3ac109b5cd7736122d1bdf83ed38b9d739c6 
1/*
2 * Copyright (C) 2013 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 <utils/Log.h>
20
21#include "Caches.h"
22#include "Debug.h"
23#include "Extensions.h"
24#include "PixelBuffer.h"
25#include "Properties.h"
26
27namespace android {
28namespace uirenderer {
29
30///////////////////////////////////////////////////////////////////////////////
31// CPU pixel buffer
32///////////////////////////////////////////////////////////////////////////////
33
34class CpuPixelBuffer: public PixelBuffer {
35public:
36    CpuPixelBuffer(GLenum format, uint32_t width, uint32_t height);
37    ~CpuPixelBuffer();
38
39    uint8_t* map(AccessMode mode = kAccessMode_ReadWrite);
40    void unmap();
41
42    uint8_t* getMappedPointer() const;
43
44    void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset);
45
46private:
47    uint8_t* mBuffer;
48};
49
50CpuPixelBuffer::CpuPixelBuffer(GLenum format, uint32_t width, uint32_t height):
51        PixelBuffer(format, width, height) {
52    mBuffer = new uint8_t[width * height * formatSize(format)];
53}
54
55CpuPixelBuffer::~CpuPixelBuffer() {
56    delete[] mBuffer;
57}
58
59uint8_t* CpuPixelBuffer::map(AccessMode mode) {
60    if (mAccessMode == kAccessMode_None) {
61        mAccessMode = mode;
62    }
63    return mBuffer;
64}
65
66void CpuPixelBuffer::unmap() {
67    mAccessMode = kAccessMode_None;
68}
69
70uint8_t* CpuPixelBuffer::getMappedPointer() const {
71    return mAccessMode == kAccessMode_None ? NULL : mBuffer;
72}
73
74void CpuPixelBuffer::upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) {
75    glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height,
76            mFormat, GL_UNSIGNED_BYTE, mBuffer + offset);
77}
78
79///////////////////////////////////////////////////////////////////////////////
80// GPU pixel buffer
81///////////////////////////////////////////////////////////////////////////////
82
83class GpuPixelBuffer: public PixelBuffer {
84public:
85    GpuPixelBuffer(GLenum format, uint32_t width, uint32_t height);
86    ~GpuPixelBuffer();
87
88    uint8_t* map(AccessMode mode = kAccessMode_ReadWrite);
89    void unmap();
90
91    uint8_t* getMappedPointer() const;
92
93    void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset);
94
95private:
96    GLuint mBuffer;
97    uint8_t* mMappedPointer;
98    Caches& mCaches;
99};
100
101GpuPixelBuffer::GpuPixelBuffer(GLenum format, uint32_t width, uint32_t height):
102        PixelBuffer(format, width, height), mMappedPointer(0), mCaches(Caches::getInstance()) {
103    glGenBuffers(1, &mBuffer);
104    mCaches.bindPixelBuffer(mBuffer);
105    glBufferData(GL_PIXEL_UNPACK_BUFFER, getSize(), NULL, GL_DYNAMIC_DRAW);
106    mCaches.unbindPixelBuffer();
107}
108
109GpuPixelBuffer::~GpuPixelBuffer() {
110    glDeleteBuffers(1, &mBuffer);
111}
112
113uint8_t* GpuPixelBuffer::map(AccessMode mode) {
114    if (mAccessMode == kAccessMode_None) {
115        mCaches.bindPixelBuffer(mBuffer);
116        mMappedPointer = (uint8_t*) glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, getSize(), mode);
117#if DEBUG_OPENGL
118        if (!mMappedPointer) {
119            GLenum status = GL_NO_ERROR;
120            while ((status = glGetError()) != GL_NO_ERROR) {
121                ALOGE("Could not map GPU pixel buffer: 0x%x", status);
122            }
123        }
124#endif
125        mAccessMode = mode;
126    }
127
128    return mMappedPointer;
129}
130
131void GpuPixelBuffer::unmap() {
132    if (mAccessMode != kAccessMode_None) {
133        if (mMappedPointer) {
134            mCaches.bindPixelBuffer(mBuffer);
135            glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
136        }
137        mAccessMode = kAccessMode_None;
138        mMappedPointer = NULL;
139    }
140}
141
142uint8_t* GpuPixelBuffer::getMappedPointer() const {
143    return mMappedPointer;
144}
145
146void GpuPixelBuffer::upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) {
147    // If the buffer is not mapped, unmap() will not bind it
148    mCaches.bindPixelBuffer(mBuffer);
149    unmap();
150    glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height, mFormat,
151            GL_UNSIGNED_BYTE, (void*) offset);
152}
153
154///////////////////////////////////////////////////////////////////////////////
155// Factory
156///////////////////////////////////////////////////////////////////////////////
157
158PixelBuffer* PixelBuffer::create(GLenum format, uint32_t width, uint32_t height, BufferType type) {
159    if (type == kBufferType_Auto && Caches::getInstance().gpuPixelBuffersEnabled) {
160        return new GpuPixelBuffer(format, width, height);
161    }
162    return new CpuPixelBuffer(format, width, height);
163}
164
165}; // namespace uirenderer
166}; // namespace android
167