git.sesse.net Git - casparcg/blob - accelerator/ogl/util/buffer.cpp

   1 /*\r
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 * This file is part of CasparCG (www.casparcg.com).\r
   5 *\r
   6 * CasparCG is free software: you can redistribute it and/or modify\r
   7 * it under the terms of the GNU General Public License as published by\r
   8 * the Free Software Foundation, either version 3 of the License, or\r
   9 * (at your option) any later version.\r
  10 *\r
  11 * CasparCG is distributed in the hope that it will be useful,\r
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14 * GNU General Public License for more details.\r
  15 *\r
  16 * You should have received a copy of the GNU General Public License\r
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.\r
  18 *\r
  19 * Author: Robert Nagy, ronag89@gmail.com\r
  20 */\r
  21 \r
  22 #include "../../stdafx.h"\r
  23 \r
  24 #include "buffer.h"\r
  25 \r
  26 #include "texture.h"\r
  27 #include "device.h"\r
  28 \r
  29 #include <common/except.h>\r
  30 #include <common/gl/gl_check.h>\r
  31 \r
  32 #include <gl/glew.h>\r
  33 \r
  34 #include <tbb/atomic.h>\r
  35 \r
  36 namespace caspar { namespace accelerator { namespace ogl {\r
  37 \r
  38 static tbb::atomic<int> g_w_total_count;\r
  39 static tbb::atomic<int> g_r_total_count;\r
  40                                                                                                                                                                                                                                                                                                                                 \r
  41 struct buffer::impl : boost::noncopyable\r
  42 {       \r
  43         GLuint                                          pbo_;\r
  44         const std::size_t                       size_;\r
  45         tbb::atomic<uint8_t*>           data_;\r
  46         GLenum                                          usage_;\r
  47         GLenum                                          target_;\r
  48 \r
  49 public:\r
  50         impl(std::size_t size, buffer::usage usage) \r
  51                 : size_(size)\r
  52                 , target_(usage == buffer::usage::write_only ? GL_PIXEL_UNPACK_BUFFER : GL_PIXEL_PACK_BUFFER)\r
  53                 , usage_(usage == buffer::usage::write_only ? GL_STREAM_DRAW : GL_STREAM_READ)\r
  54         {\r
  55                 data_ = nullptr;\r
  56                 GL(glGenBuffers(1, &pbo_));\r
  57                 bind(); \r
  58                 GL(glBufferData(target_, size_, NULL, usage_));         \r
  59                 if(usage_ == GL_STREAM_DRAW)    \r
  60                         data_ = (uint8_t*)GL2(glMapBuffer(target_, usage_ == GL_STREAM_DRAW ? GL_WRITE_ONLY : GL_READ_ONLY));  \r
  61                 unbind();\r
  62 \r
  63                 if(!pbo_)\r
  64                         BOOST_THROW_EXCEPTION(caspar_exception() << msg_info("Failed to allocate buffer."));\r
  65 \r
  66                 //CASPAR_LOG(trace) << "[buffer] [" << ++(usage_ == buffer::usage::write_only ? g_w_total_count : g_r_total_count) << L"] allocated size:" << size_ << " usage: " << (usage == buffer::usage::write_only ? "write_only" : "read_only");\r
  67         }       \r
  68 \r
  69         ~impl()\r
  70         {\r
  71                 glDeleteBuffers(1, &pbo_);\r
  72         }\r
  73 \r
  74         void* map()\r
  75         {\r
  76                 if(data_ != nullptr)\r
  77                         return data_;\r
  78 \r
  79                 GL(glBindBuffer(target_, pbo_));\r
  80                 if(usage_ == GL_STREAM_DRAW)                    \r
  81                         GL(glBufferData(target_, size_, NULL, usage_)); // Notify OpenGL that we don't care about previous data.\r
  82                 \r
  83                 data_ = (uint8_t*)GL2(glMapBuffer(target_, usage_ == GL_STREAM_DRAW ? GL_WRITE_ONLY : GL_READ_ONLY));  \r
  84                 GL(glBindBuffer(target_, 0));\r
  85                 if(!data_)\r
  86                         BOOST_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to map target OpenGL Pixel Buffer Object."));\r
  87 \r
  88                 return data_;\r
  89         }\r
  90         \r
  91         void unmap()\r
  92         {\r
  93                 if(data_ == nullptr)\r
  94                         return;\r
  95                 \r
  96                 GL(glBindBuffer(target_, pbo_));\r
  97                 GL(glUnmapBuffer(target_));     \r
  98                 if(usage_ == GL_STREAM_READ)                    \r
  99                         GL(glBufferData(target_, size_, NULL, usage_)); // Notify OpenGL that we don't care about previous data.\r
 100                 data_ = nullptr;        \r
 101                 GL(glBindBuffer(target_, 0));\r
 102         }\r
 103 \r
 104         void bind()\r
 105         {\r
 106                 GL(glBindBuffer(target_, pbo_));\r
 107         }\r
 108 \r
 109         void unbind()\r
 110         {\r
 111                 GL(glBindBuffer(target_, 0));\r
 112         }\r
 113 };\r
 114 \r
 115 buffer::buffer(std::size_t size, usage usage) : impl_(new impl(size, usage)){}\r
 116 buffer::~buffer(){}\r
 117 uint8_t* buffer::data(){return impl_->data_;}\r
 118 void buffer::map(){impl_->map();}\r
 119 void buffer::unmap(){impl_->unmap();}\r
 120 void buffer::bind() const{impl_->bind();}\r
 121 void buffer::unbind() const{impl_->unbind();}\r
 122 std::size_t buffer::size() const { return impl_->size_; }\r
 123 \r
 124 }}}