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 "host_buffer.h"\r
  23 \r
  24 #include "fence.h"\r
  25 #include "ogl_device.h"\r
  26 \r
  27 #include <common/gl/gl_check.h>\r
  28 \r
  29 namespace caspar { namespace core {\r
  30                                                                                                                                                                                                                                                                                                                                 \r
  31 struct host_buffer::implementation : boost::noncopyable\r
  32 {       \r
  33         GLuint                  pbo_;\r
  34         const size_t    size_;\r
  35         void*                   data_;\r
  36         GLenum                  usage_;\r
  37         GLenum                  target_;\r
  38         core::fence             fence_;\r
  39 \r
  40 public:\r
  41         implementation(size_t size, usage_t usage) \r
  42                 : size_(size)\r
  43                 , data_(nullptr)\r
  44                 , pbo_(0)\r
  45                 , target_(usage == write_only ? GL_PIXEL_UNPACK_BUFFER : GL_PIXEL_PACK_BUFFER)\r
  46                 , usage_(usage == write_only ? GL_STREAM_DRAW : GL_STREAM_READ)\r
  47         {\r
  48                 GL(glGenBuffers(1, &pbo_));\r
  49                 GL(glBindBuffer(target_, pbo_));\r
  50                 if(usage_ != write_only)        \r
  51                         GL(glBufferData(target_, size_, NULL, usage_)); \r
  52                 GL(glBindBuffer(target_, 0));\r
  53 \r
  54                 if(!pbo_)\r
  55                         BOOST_THROW_EXCEPTION(caspar_exception() << msg_info("Failed to allocate buffer."));\r
  56 \r
  57                 CASPAR_LOG(debug) << "[host_buffer] allocated size:" << size_ << " usage: " << (usage == write_only ? "write_only" : "read_only");\r
  58         }       \r
  59 \r
  60         ~implementation()\r
  61         {\r
  62                 try\r
  63                 {\r
  64                         GL(glDeleteBuffers(1, &pbo_));\r
  65                 }\r
  66                 catch(...)\r
  67                 {\r
  68                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  69                 }\r
  70         }\r
  71 \r
  72         void map()\r
  73         {\r
  74                 if(data_)\r
  75                         return;\r
  76 \r
  77                 if(usage_ == write_only)                        \r
  78                         GL(glBufferData(target_, size_, NULL, usage_)); // Notify OpenGL that we don't care about previous data.\r
  79                 \r
  80                 GL(glBindBuffer(target_, pbo_));\r
  81                 data_ = GL2(glMapBuffer(target_, usage_ == GL_STREAM_DRAW ? GL_WRITE_ONLY : GL_READ_ONLY));  \r
  82                 GL(glBindBuffer(target_, 0)); \r
  83                 if(!data_)\r
  84                         BOOST_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to map target_ OpenGL Pixel Buffer Object."));\r
  85         }\r
  86 \r
  87         void map2(ogl_device& ogl)\r
  88         {\r
  89                 fence_.wait(ogl);\r
  90                 ogl.invoke(std::bind(&implementation::map, this), high_priority);\r
  91         }\r
  92 \r
  93         void unmap()\r
  94         {\r
  95                 if(!data_)\r
  96                         return;\r
  97                 \r
  98                 GL(glBindBuffer(target_, pbo_));\r
  99                 GL(glUnmapBuffer(target_));     \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         void fence()\r
 115         {\r
 116                 fence_.set();\r
 117                 GL(glFlush());\r
 118         }\r
 119 };\r
 120 \r
 121 host_buffer::host_buffer(size_t size, usage_t usage) : impl_(new implementation(size, usage)){}\r
 122 const void* host_buffer::data() const {return impl_->data_;}\r
 123 void* host_buffer::data() {return impl_->data_;}\r
 124 void host_buffer::map(){impl_->map();}\r
 125 void host_buffer::map(ogl_device& ogl){impl_->map2(ogl);}\r
 126 void host_buffer::unmap(){impl_->unmap();}\r
 127 void host_buffer::bind(){impl_->bind();}\r
 128 void host_buffer::unbind(){impl_->unbind();}\r
 129 void host_buffer::fence(){impl_->fence();}\r
 130 size_t host_buffer::size() const { return impl_->size_; }\r
 131 \r
 132 }}