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 #include "PixelBuffer.h"
18
19 #include "Debug.h"
20 #include "Extensions.h"
21 #include "Properties.h"
22 #include "renderstate/RenderState.h"
23 #include "utils/GLUtils.h"
24
25 #include <utils/Log.h>
26
27 namespace android {
28 namespace uirenderer {
29
30 ///////////////////////////////////////////////////////////////////////////////
31 // CPU pixel buffer
32 ///////////////////////////////////////////////////////////////////////////////
33
34 class CpuPixelBuffer: public PixelBuffer {
35 public:
36 CpuPixelBuffer(GLenum format, uint32_t width, uint32_t height);
37
38 uint8_t* map(AccessMode mode = kAccessMode_ReadWrite) override;
39
40 uint8_t* getMappedPointer() const override;
41
42 void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) override;
43
44 protected:
45 void unmap() override;
46
47 private:
48 std::unique_ptr<uint8_t[]> mBuffer;
49 };
50
CpuPixelBuffer(GLenum format,uint32_t width,uint32_t height)51 CpuPixelBuffer::CpuPixelBuffer(GLenum format, uint32_t width, uint32_t height)
52 : PixelBuffer(format, width, height)
53 , mBuffer(new uint8_t[width * height * formatSize(format)]) {
54 }
55
map(AccessMode mode)56 uint8_t* CpuPixelBuffer::map(AccessMode mode) {
57 if (mAccessMode == kAccessMode_None) {
58 mAccessMode = mode;
59 }
60 return mBuffer.get();
61 }
62
unmap()63 void CpuPixelBuffer::unmap() {
64 mAccessMode = kAccessMode_None;
65 }
66
getMappedPointer() const67 uint8_t* CpuPixelBuffer::getMappedPointer() const {
68 return mAccessMode == kAccessMode_None ? nullptr : mBuffer.get();
69 }
70
upload(uint32_t x,uint32_t y,uint32_t width,uint32_t height,int offset)71 void CpuPixelBuffer::upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) {
72 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height,
73 mFormat, GL_UNSIGNED_BYTE, &mBuffer[offset]);
74 }
75
76 ///////////////////////////////////////////////////////////////////////////////
77 // GPU pixel buffer
78 ///////////////////////////////////////////////////////////////////////////////
79
80 class GpuPixelBuffer: public PixelBuffer {
81 public:
82 GpuPixelBuffer(GLenum format, uint32_t width, uint32_t height);
83 ~GpuPixelBuffer();
84
85 uint8_t* map(AccessMode mode = kAccessMode_ReadWrite) override;
86
87 uint8_t* getMappedPointer() const override;
88
89 void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) override;
90
91 protected:
92 void unmap() override;
93
94 private:
95 GLuint mBuffer;
96 uint8_t* mMappedPointer;
97 Caches& mCaches;
98 };
99
GpuPixelBuffer(GLenum format,uint32_t width,uint32_t height)100 GpuPixelBuffer::GpuPixelBuffer(GLenum format,
101 uint32_t width, uint32_t height)
102 : PixelBuffer(format, width, height)
103 , mMappedPointer(nullptr)
104 , mCaches(Caches::getInstance()){
105 glGenBuffers(1, &mBuffer);
106
107 mCaches.pixelBufferState().bind(mBuffer);
108 glBufferData(GL_PIXEL_UNPACK_BUFFER, getSize(), nullptr, GL_DYNAMIC_DRAW);
109 mCaches.pixelBufferState().unbind();
110 }
111
~GpuPixelBuffer()112 GpuPixelBuffer::~GpuPixelBuffer() {
113 glDeleteBuffers(1, &mBuffer);
114 }
115
map(AccessMode mode)116 uint8_t* GpuPixelBuffer::map(AccessMode mode) {
117 if (mAccessMode == kAccessMode_None) {
118 mCaches.pixelBufferState().bind(mBuffer);
119 mMappedPointer = (uint8_t*) glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, getSize(), mode);
120 if (CC_UNLIKELY(!mMappedPointer)) {
121 GLUtils::dumpGLErrors();
122 LOG_ALWAYS_FATAL("Failed to map PBO");
123 }
124 mAccessMode = mode;
125 mCaches.pixelBufferState().unbind();
126 }
127
128 return mMappedPointer;
129 }
130
unmap()131 void GpuPixelBuffer::unmap() {
132 if (mAccessMode != kAccessMode_None) {
133 if (mMappedPointer) {
134 mCaches.pixelBufferState().bind(mBuffer);
135 GLboolean status = glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
136 if (status == GL_FALSE) {
137 ALOGE("Corrupted GPU pixel buffer");
138 }
139 }
140 mAccessMode = kAccessMode_None;
141 mMappedPointer = nullptr;
142 }
143 }
144
getMappedPointer() const145 uint8_t* GpuPixelBuffer::getMappedPointer() const {
146 return mMappedPointer;
147 }
148
upload(uint32_t x,uint32_t y,uint32_t width,uint32_t height,int offset)149 void GpuPixelBuffer::upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) {
150 // If the buffer is not mapped, unmap() will not bind it
151 mCaches.pixelBufferState().bind(mBuffer);
152 unmap();
153 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height, mFormat,
154 GL_UNSIGNED_BYTE, reinterpret_cast<void*>(offset));
155 mCaches.pixelBufferState().unbind();
156 }
157
158 ///////////////////////////////////////////////////////////////////////////////
159 // Factory
160 ///////////////////////////////////////////////////////////////////////////////
161
create(GLenum format,uint32_t width,uint32_t height,BufferType type)162 PixelBuffer* PixelBuffer::create(GLenum format,
163 uint32_t width, uint32_t height, BufferType type) {
164 if (type == kBufferType_Auto && Caches::getInstance().gpuPixelBuffersEnabled) {
165 return new GpuPixelBuffer(format, width, height);
166 }
167 return new CpuPixelBuffer(format, width, height);
168 }
169
170 }; // namespace uirenderer
171 }; // namespace android
172