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 void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) override;
41
42 protected:
43 void unmap() override;
44
45 private:
46 std::unique_ptr<uint8_t[]> mBuffer;
47 };
48
CpuPixelBuffer(GLenum format,uint32_t width,uint32_t height)49 CpuPixelBuffer::CpuPixelBuffer(GLenum format, uint32_t width, uint32_t height)
50 : PixelBuffer(format, width, height)
51 , mBuffer(new uint8_t[width * height * formatSize(format)]) {
52 }
53
map(AccessMode mode)54 uint8_t* CpuPixelBuffer::map(AccessMode mode) {
55 if (mAccessMode == kAccessMode_None) {
56 mAccessMode = mode;
57 }
58 return mBuffer.get();
59 }
60
unmap()61 void CpuPixelBuffer::unmap() {
62 mAccessMode = kAccessMode_None;
63 }
64
upload(uint32_t x,uint32_t y,uint32_t width,uint32_t height,int offset)65 void CpuPixelBuffer::upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) {
66 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height,
67 mFormat, GL_UNSIGNED_BYTE, &mBuffer[offset]);
68 }
69
70 ///////////////////////////////////////////////////////////////////////////////
71 // GPU pixel buffer
72 ///////////////////////////////////////////////////////////////////////////////
73
74 class GpuPixelBuffer: public PixelBuffer {
75 public:
76 GpuPixelBuffer(GLenum format, uint32_t width, uint32_t height);
77 ~GpuPixelBuffer();
78
79 uint8_t* map(AccessMode mode = kAccessMode_ReadWrite) override;
80
81 void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) override;
82
83 protected:
84 void unmap() override;
85
86 private:
87 GLuint mBuffer;
88 uint8_t* mMappedPointer;
89 Caches& mCaches;
90 };
91
GpuPixelBuffer(GLenum format,uint32_t width,uint32_t height)92 GpuPixelBuffer::GpuPixelBuffer(GLenum format,
93 uint32_t width, uint32_t height)
94 : PixelBuffer(format, width, height)
95 , mMappedPointer(nullptr)
96 , mCaches(Caches::getInstance()){
97 glGenBuffers(1, &mBuffer);
98
99 mCaches.pixelBufferState().bind(mBuffer);
100 glBufferData(GL_PIXEL_UNPACK_BUFFER, getSize(), nullptr, GL_DYNAMIC_DRAW);
101 mCaches.pixelBufferState().unbind();
102 }
103
~GpuPixelBuffer()104 GpuPixelBuffer::~GpuPixelBuffer() {
105 glDeleteBuffers(1, &mBuffer);
106 }
107
map(AccessMode mode)108 uint8_t* GpuPixelBuffer::map(AccessMode mode) {
109 if (mAccessMode == kAccessMode_None) {
110 mCaches.pixelBufferState().bind(mBuffer);
111 mMappedPointer = (uint8_t*) glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, getSize(), mode);
112 if (CC_UNLIKELY(!mMappedPointer)) {
113 GLUtils::dumpGLErrors();
114 LOG_ALWAYS_FATAL("Failed to map PBO");
115 }
116 mAccessMode = mode;
117 mCaches.pixelBufferState().unbind();
118 }
119
120 return mMappedPointer;
121 }
122
unmap()123 void GpuPixelBuffer::unmap() {
124 if (mAccessMode != kAccessMode_None) {
125 if (mMappedPointer) {
126 mCaches.pixelBufferState().bind(mBuffer);
127 GLboolean status = glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
128 if (status == GL_FALSE) {
129 ALOGE("Corrupted GPU pixel buffer");
130 }
131 }
132 mAccessMode = kAccessMode_None;
133 mMappedPointer = nullptr;
134 }
135 }
136
upload(uint32_t x,uint32_t y,uint32_t width,uint32_t height,int offset)137 void GpuPixelBuffer::upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) {
138 // If the buffer is not mapped, unmap() will not bind it
139 mCaches.pixelBufferState().bind(mBuffer);
140 unmap();
141 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height, mFormat,
142 GL_UNSIGNED_BYTE, reinterpret_cast<void*>(offset));
143 mCaches.pixelBufferState().unbind();
144 }
145
146 ///////////////////////////////////////////////////////////////////////////////
147 // Factory
148 ///////////////////////////////////////////////////////////////////////////////
149
create(GLenum format,uint32_t width,uint32_t height,BufferType type)150 PixelBuffer* PixelBuffer::create(GLenum format,
151 uint32_t width, uint32_t height, BufferType type) {
152 if (type == kBufferType_Auto && Caches::getInstance().gpuPixelBuffersEnabled) {
153 return new GpuPixelBuffer(format, width, height);
154 }
155 return new CpuPixelBuffer(format, width, height);
156 }
157
158 }; // namespace uirenderer
159 }; // namespace android
160