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 "device_buffer.h"\r
  26 #include "ogl_device.h"\r
  27 \r
  28 #include <common/gl/gl_check.h>\r
  29 \r
  30 namespace caspar { namespace core {\r
  31                                                                                                                                                                                                                                                                                                                                 \r
  32 struct host_buffer::implementation : boost::noncopyable\r
  33 {       \r
  34         GLuint                  pbo_;\r
  35         const size_t    size_;\r
  36         void*                   data_;\r
  37         GLenum                  usage_;\r
  38         GLenum                  target_;\r
  39         fence                   fence_;\r
  40 \r
  41 public:\r
  42         implementation(size_t size, usage_t usage) \r
  43                 : size_(size)\r
  44                 , data_(nullptr)\r
  45                 , pbo_(0)\r
  46                 , target_(usage == write_only ? GL_PIXEL_UNPACK_BUFFER : GL_PIXEL_PACK_BUFFER)\r
  47                 , usage_(usage == write_only ? GL_STREAM_DRAW : GL_STREAM_READ)\r
  48         {\r
  49                 GL(glGenBuffers(1, &pbo_));\r
  50                 GL(glBindBuffer(target_, pbo_));\r
  51                 if(usage_ != write_only)        \r
  52                         GL(glBufferData(target_, size_, NULL, usage_)); \r
  53                 GL(glBindBuffer(target_, 0));\r
  54 \r
  55                 if(!pbo_)\r
  56                         BOOST_THROW_EXCEPTION(caspar_exception() << msg_info("Failed to allocate buffer."));\r
  57 \r
  58                 CASPAR_LOG(debug) << "[host_buffer] allocated size:" << size_ << " usage: " << (usage == write_only ? "write_only" : "read_only");\r
  59         }       \r
  60 \r
  61         ~implementation()\r
  62         {\r
  63                 try\r
  64                 {\r
  65                         GL(glDeleteBuffers(1, &pbo_));\r
  66                 }\r
  67                 catch(...)\r
  68                 {\r
  69                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  70                 }\r
  71         }\r
  72 \r
  73         void map()\r
  74         {\r
  75                 if(data_)\r
  76                         return;\r
  77 \r
  78                 if(usage_ == write_only)                        \r
  79                         GL(glBufferData(target_, size_, NULL, usage_)); // Notify OpenGL that we don't care about previous data.\r
  80                 \r
  81                 GL(glBindBuffer(target_, pbo_));\r
  82                 data_ = GL2(glMapBuffer(target_, usage_ == GL_STREAM_DRAW ? GL_WRITE_ONLY : GL_READ_ONLY));  \r
  83                 GL(glBindBuffer(target_, 0)); \r
  84                 if(!data_)\r
  85                         BOOST_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to map target_ OpenGL Pixel Buffer Object."));\r
  86         }\r
  87 \r
  88         void wait(ogl_device& ogl)\r
  89         {\r
  90                 fence_.wait(ogl);\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 read(device_buffer& source)\r
 115         {\r
 116                 source.attach(0);\r
 117                 source.bind();\r
 118                 unmap();\r
 119                 bind();\r
 120                 GL(glReadPixels(0, 0, source.width(), source.height(), format(source.stride()), GL_UNSIGNED_BYTE, NULL));\r
 121                 unbind();\r
 122                 source.unbind();\r
 123                 fence_.set();\r
 124                 GL(glFlush());\r
 125         }\r
 126 \r
 127         bool ready() const\r
 128         {\r
 129                 return fence_.ready();\r
 130         }\r
 131 };\r
 132 \r
 133 host_buffer::host_buffer(size_t size, usage_t usage) : impl_(new implementation(size, usage)){}\r
 134 const void* host_buffer::data() const {return impl_->data_;}\r
 135 void* host_buffer::data() {return impl_->data_;}\r
 136 void host_buffer::map(){impl_->map();}\r
 137 void host_buffer::unmap(){impl_->unmap();}\r
 138 void host_buffer::bind(){impl_->bind();}\r
 139 void host_buffer::unbind(){impl_->unbind();}\r
 140 void host_buffer::read(device_buffer& source){impl_->read(source);}\r
 141 size_t host_buffer::size() const { return impl_->size_; }\r
 142 bool host_buffer::ready() const{return impl_->ready();}\r
 143 void host_buffer::wait(ogl_device& ogl){impl_->wait(ogl);}\r
 144 \r
 145 }}