git.sesse.net Git - casparcg/blob - core/mixer/image/image_mixer.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 "image_mixer.h"\r
  23 #include "image_kernel.h"\r
  24 \r
  25 #include "../gpu/ogl_device.h"\r
  26 #include "../gpu/host_buffer.h"\r
  27 #include "../gpu/device_buffer.h"\r
  28 #include "../gpu/gpu_write_frame.h"\r
  29 \r
  30 #include <common/concurrency/executor.h>\r
  31 #include <common/exception/exceptions.h>\r
  32 #include <common/gl/gl_check.h>\r
  33 \r
  34 #include <core/producer/frame/image_transform.h>\r
  35 #include <core/producer/frame/pixel_format.h>\r
  36 #include <core/video_format.h>\r
  37 \r
  38 #include <boost/foreach.hpp>\r
  39 \r
  40 #include <Glee.h>\r
  41 #include <SFML/Window/Context.hpp>\r
  42 \r
  43 #include <array>\r
  44 #include <unordered_map>\r
  45 \r
  46 namespace caspar { namespace mixer {\r
  47                 \r
  48 struct image_mixer::implementation : boost::noncopyable\r
  49 {       \r
  50         struct render_item\r
  51         {\r
  52                 core::pixel_format_desc desc;\r
  53                 std::vector<safe_ptr<device_buffer>> textures;\r
  54                 core::image_transform transform;\r
  55         };\r
  56 \r
  57         const core::video_format_desc format_desc_;\r
  58         \r
  59         std::stack<core::image_transform> transform_stack_;\r
  60 \r
  61         bool is_key_;\r
  62 \r
  63         safe_ptr<device_buffer> front_target_;\r
  64         safe_ptr<device_buffer> back_target_;\r
  65         safe_ptr<device_buffer> key_target_;\r
  66 \r
  67         safe_ptr<host_buffer>   reading_;\r
  68 \r
  69         image_kernel kernel_;\r
  70                 \r
  71         std::vector<render_item> waiting_queue_;\r
  72         std::vector<render_item> render_queue_;\r
  73 \r
  74 public:\r
  75         implementation(const core::video_format_desc& format_desc) \r
  76                 : format_desc_(format_desc)\r
  77                 , is_key_(false)\r
  78                 , back_target_(ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4))\r
  79                 , front_target_(ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4))\r
  80                 , key_target_(ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4))\r
  81                 , reading_(ogl_device::create_host_buffer(format_desc_.size, host_buffer::read_only))\r
  82         {\r
  83                 transform_stack_.push(core::image_transform());\r
  84         }\r
  85         \r
  86         void begin(const core::basic_frame& frame)\r
  87         {\r
  88                 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());\r
  89         }\r
  90                 \r
  91         void visit(core::write_frame& frame)\r
  92         {               \r
  93                 auto gpu_frame = dynamic_cast<gpu_write_frame*>(&frame);\r
  94                 if(!gpu_frame)\r
  95                         return;\r
  96                 \r
  97                 auto desc = gpu_frame->get_pixel_format_desc();\r
  98                 auto buffers = gpu_frame->get_plane_buffers();\r
  99                 auto transform = transform_stack_.top();\r
 100 \r
 101                 ogl_device::begin_invoke([=]\r
 102                 {\r
 103                         render_item item;\r
 104 \r
 105                         item.desc = desc;\r
 106                         item.transform = transform;\r
 107                         \r
 108                         for(size_t n = 0; n < buffers.size(); ++n)\r
 109                         {\r
 110                                 GL(glActiveTexture(GL_TEXTURE0+n));\r
 111                                 auto texture = ogl_device::create_device_buffer(desc.planes[n].width, desc.planes[n].height, desc.planes[n].channels);\r
 112                                 texture->read(*buffers[n]);\r
 113                                 item.textures.push_back(texture);\r
 114                         }       \r
 115 \r
 116                         waiting_queue_.push_back(item);\r
 117                 });\r
 118         }\r
 119 \r
 120         void end()\r
 121         {\r
 122                 transform_stack_.pop();\r
 123         }\r
 124 \r
 125         boost::unique_future<safe_ptr<const host_buffer>> render()\r
 126         {\r
 127                 auto result = ogl_device::begin_invoke([=]() -> safe_ptr<const host_buffer>\r
 128                 {\r
 129                         reading_->map(); // Might block.\r
 130                         return reading_;\r
 131                 });\r
 132                         \r
 133                 ogl_device::begin_invoke([=]\r
 134                 {\r
 135                         is_key_ = false;\r
 136 \r
 137                         // Clear and bind frame-buffers.\r
 138 \r
 139                         key_target_->attach();\r
 140                         GL(glClear(GL_COLOR_BUFFER_BIT));       \r
 141 \r
 142                         front_target_->attach();\r
 143                         GL(glClear(GL_COLOR_BUFFER_BIT));\r
 144 \r
 145                         // Render items.\r
 146 \r
 147                         BOOST_FOREACH(auto item, render_queue_)\r
 148                                 render(item);                   \r
 149 \r
 150                         // Move waiting items to queue.\r
 151 \r
 152                         render_queue_ = std::move(waiting_queue_);\r
 153 \r
 154                         // Start read-back.\r
 155 \r
 156                         reading_ = ogl_device::create_host_buffer(format_desc_.size, host_buffer::read_only);\r
 157                         front_target_->attach();\r
 158                         front_target_->write(*reading_);\r
 159                         std::swap(front_target_, back_target_);\r
 160                 });\r
 161 \r
 162                 return std::move(result);\r
 163         }\r
 164 \r
 165         void render(const render_item& item)\r
 166         {               \r
 167                 const auto desc          = item.desc;\r
 168                 auto       textures      = item.textures;\r
 169                 const auto transform = item.transform;\r
 170                                 \r
 171                 // Bind textures\r
 172 \r
 173                 for(size_t n = 0; n < textures.size(); ++n)\r
 174                 {\r
 175                         GL(glActiveTexture(GL_TEXTURE0+n));\r
 176                         textures[n]->bind();\r
 177                 }               \r
 178 \r
 179                 // Setup key and kernel\r
 180 \r
 181                 bool has_separate_key = false;\r
 182 \r
 183                 if(transform.get_is_key())\r
 184                 {\r
 185                         if(!is_key_)\r
 186                         {\r
 187                                 key_target_->attach();\r
 188                                 is_key_ = true;\r
 189                                 GL(glClear(GL_COLOR_BUFFER_BIT));               \r
 190                         }\r
 191                 }               \r
 192                 else\r
 193                 {                                               \r
 194                         if(is_key_)\r
 195                         {\r
 196                                 has_separate_key = true;\r
 197                                 is_key_ = false;\r
 198 \r
 199                                 front_target_->attach();                        \r
 200                                 GL(glActiveTexture(GL_TEXTURE0+3));\r
 201                                 key_target_->bind();\r
 202                         }       \r
 203                 }       \r
 204 \r
 205                 // Draw\r
 206 \r
 207                 kernel_.draw(format_desc_.width, format_desc_.height, desc, transform, has_separate_key);       \r
 208         }\r
 209                         \r
 210         std::vector<safe_ptr<host_buffer>> create_buffers(const core::pixel_format_desc& format)\r
 211         {\r
 212                 std::vector<safe_ptr<host_buffer>> buffers;\r
 213                 std::transform(format.planes.begin(), format.planes.end(), std::back_inserter(buffers), [&](const core::pixel_format_desc::plane& plane)\r
 214                 {\r
 215                         return ogl_device::create_host_buffer(plane.size, host_buffer::write_only);\r
 216                 });\r
 217                 return buffers;\r
 218         }\r
 219 };\r
 220 \r
 221 image_mixer::image_mixer(const core::video_format_desc& format_desc) : impl_(new implementation(format_desc)){}\r
 222 void image_mixer::begin(const core::basic_frame& frame){impl_->begin(frame);}\r
 223 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 224 void image_mixer::end(){impl_->end();}\r
 225 boost::unique_future<safe_ptr<const host_buffer>> image_mixer::render(){return impl_->render();}\r
 226 std::vector<safe_ptr<host_buffer>> image_mixer::create_buffers(const core::pixel_format_desc& format){return impl_->create_buffers(format);}\r
 227 \r
 228 }}