git.sesse.net Git - casparcg/blob - core/mixer/gpu/host_buffer.cpp

   1 /*\r
   2 * copyright (c) 2010 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 *  This file is part of CasparCG.\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 */\r
  20 #include "../../stdafx.h"\r
  21 \r
  22 #include "../gpu/host_buffer.h"\r
  23 \r
  24 #include <common/gl/gl_check.h>\r
  25 \r
  26 namespace caspar { namespace core {\r
  27                                                                                                                                                                                                                                                                                                                                 \r
  28 struct host_buffer::implementation : boost::noncopyable\r
  29 {       \r
  30         GLuint pbo_;\r
  31 \r
  32         const size_t size_;\r
  33 \r
  34         void* data_;\r
  35         GLenum usage_;\r
  36         GLenum target_;\r
  37 \r
  38 public:\r
  39         implementation(size_t size, usage_t usage) \r
  40                 : size_(size)\r
  41                 , data_(nullptr)\r
  42                 , pbo_(0)\r
  43                 , target_(usage == write_only ? GL_PIXEL_UNPACK_BUFFER : GL_PIXEL_PACK_BUFFER)\r
  44                 , usage_(usage == write_only ? GL_STREAM_DRAW : GL_STREAM_READ)\r
  45         {\r
  46                 GL(glGenBuffers(1, &pbo_));\r
  47                 GL(glBindBuffer(target_, pbo_));\r
  48                 if(usage_ != write_only)        \r
  49                         GL(glBufferData(target_, size_, NULL, usage_)); \r
  50                 GL(glBindBuffer(target_, 0));\r
  51 \r
  52                 if(!pbo_)\r
  53                         BOOST_THROW_EXCEPTION(caspar_exception() << msg_info("Failed to allocate buffer."));\r
  54 \r
  55                 //CASPAR_LOG(trace) << "[host_buffer] allocated size:" << size_ << " usage: " << (usage == write_only ? "write_only" : "read_only");\r
  56         }       \r
  57 \r
  58         ~implementation()\r
  59         {\r
  60                 try\r
  61                 {\r
  62                         GL(glDeleteBuffers(1, &pbo_));\r
  63                 }\r
  64                 catch(...)\r
  65                 {\r
  66                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  67                 }\r
  68         }\r
  69 \r
  70         void map()\r
  71         {\r
  72                 if(data_)\r
  73                         return;\r
  74 \r
  75                 if(usage_ == write_only)                        \r
  76                         GL(glBufferData(target_, size_, NULL, usage_)); // Notify OpenGL that we don't care about previous data.\r
  77                 \r
  78                 GL(glBindBuffer(target_, pbo_));\r
  79                 data_ = glMapBuffer(target_, usage_ == GL_STREAM_DRAW ? GL_WRITE_ONLY : GL_READ_ONLY);  \r
  80                 GL(glBindBuffer(target_, 0)); \r
  81                 if(!data_)\r
  82                         BOOST_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to map target_ OpenGL Pixel Buffer Object."));\r
  83         }\r
  84 \r
  85         void unmap()\r
  86         {\r
  87                 if(!data_)\r
  88                         return;\r
  89                 \r
  90                 GL(glBindBuffer(target_, pbo_));\r
  91                 GL(glUnmapBuffer(target_));     \r
  92                 data_ = nullptr;                \r
  93                 GL(glBindBuffer(target_, 0));\r
  94         }\r
  95 \r
  96         void bind()\r
  97         {\r
  98                 GL(glBindBuffer(target_, pbo_));\r
  99         }\r
 100 \r
 101         void unbind()\r
 102         {\r
 103                 GL(glBindBuffer(target_, 0));\r
 104         }\r
 105 };\r
 106 \r
 107 host_buffer::host_buffer(size_t size, usage_t usage) : impl_(new implementation(size, usage)){}\r
 108 const void* host_buffer::data() const {return impl_->data_;}\r
 109 void* host_buffer::data() {return impl_->data_;}\r
 110 void host_buffer::map(){impl_->map();}\r
 111 void host_buffer::unmap(){impl_->unmap();}\r
 112 void host_buffer::bind(){impl_->bind();}\r
 113 void host_buffer::unbind(){impl_->unbind();}\r
 114 \r
 115 size_t host_buffer::size() const { return impl_->size_; }\r
 116 \r
 117 }}