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 "../write_frame.h"\r
  29 \r
  30 #include "../../video_channel_context.h"\r
  31 \r
  32 #include <common/concurrency/executor.h>\r
  33 #include <common/exception/exceptions.h>\r
  34 #include <common/gl/gl_check.h>\r
  35 \r
  36 #include <core/producer/frame/image_transform.h>\r
  37 #include <core/producer/frame/pixel_format.h>\r
  38 #include <core/video_format.h>\r
  39 \r
  40 #include <boost/foreach.hpp>\r
  41 \r
  42 #include <array>\r
  43 #include <unordered_map>\r
  44 \r
  45 namespace caspar { namespace core {\r
  46                 \r
  47 struct image_mixer::implementation : boost::noncopyable\r
  48 {       \r
  49         static const size_t LOCAL_KEY_INDEX = 3;\r
  50         static const size_t LAYER_KEY_INDEX = 4;\r
  51 \r
  52         struct render_item\r
  53         {\r
  54                 pixel_format_desc                                        desc;\r
  55                 std::vector<safe_ptr<device_buffer>> textures;\r
  56                 core::image_transform                            transform;\r
  57         };\r
  58 \r
  59         video_channel_context&                                          channel_;\r
  60         \r
  61         std::stack<core::image_transform>               transform_stack_;\r
  62         std::queue<std::queue<render_item>>             render_queue_;\r
  63         \r
  64         image_kernel kernel_;\r
  65                 \r
  66         safe_ptr<host_buffer>   read_buffer_;\r
  67         safe_ptr<device_buffer> draw_buffer_;\r
  68         safe_ptr<device_buffer> write_buffer_;\r
  69 \r
  70         safe_ptr<device_buffer> local_key_buffer_;\r
  71         safe_ptr<device_buffer> layer_key_buffer_;\r
  72 \r
  73         bool local_key_;\r
  74         bool layer_key_;\r
  75         \r
  76 public:\r
  77         implementation(video_channel_context& video_channel) \r
  78                 : channel_(video_channel)\r
  79                 , read_buffer_(video_channel.ogl().create_host_buffer(video_channel.get_format_desc().size, host_buffer::read_only))\r
  80                 , draw_buffer_(video_channel.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 4))\r
  81                 , write_buffer_ (video_channel.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 4))\r
  82                 , local_key_buffer_(video_channel.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 1))\r
  83                 , layer_key_buffer_(video_channel.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 1))\r
  84                 , local_key_(false)\r
  85                 , layer_key_(false)\r
  86         {\r
  87                 transform_stack_.push(core::image_transform());\r
  88         }\r
  89         \r
  90         void begin(const core::basic_frame& frame)\r
  91         {\r
  92                 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());\r
  93         }\r
  94                 \r
  95         void visit(core::write_frame& frame)\r
  96         {                       \r
  97                 render_item item = {frame.get_pixel_format_desc(), frame.get_textures(), transform_stack_.top()*frame.get_image_transform()};   \r
  98                 render_queue_.back().push(item);\r
  99         }\r
 100 \r
 101         void end()\r
 102         {\r
 103                 transform_stack_.pop();\r
 104         }\r
 105 \r
 106         void begin_layer()\r
 107         {\r
 108                 render_queue_.push(std::queue<render_item>());\r
 109         }\r
 110 \r
 111         void end_layer()\r
 112         {\r
 113         }\r
 114 \r
 115         void reinitialize_buffers()\r
 116         {\r
 117                 read_buffer_      = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 118                 draw_buffer_      = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
 119                 write_buffer_     = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
 120                 local_key_buffer_ = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
 121                 layer_key_buffer_ = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
 122                 channel_.ogl().gc();\r
 123         }\r
 124 \r
 125         safe_ptr<host_buffer> render()\r
 126         {               \r
 127                 auto read_buffer = read_buffer_;\r
 128                 auto result = channel_.ogl().begin_invoke([=]()  -> safe_ptr<host_buffer>\r
 129                 {\r
 130                         read_buffer->map();\r
 131                         return read_buffer;\r
 132                 });\r
 133 \r
 134                 auto render_queue = std::move(render_queue_);\r
 135 \r
 136                 channel_.ogl().begin_invoke([=]() mutable\r
 137                 {\r
 138                         if(draw_buffer_->width() != channel_.get_format_desc().width || draw_buffer_->height() != channel_.get_format_desc().height)\r
 139                                 reinitialize_buffers();\r
 140 \r
 141                         local_key_ = false;\r
 142                         layer_key_ = false;\r
 143 \r
 144                         // Clear buffers.\r
 145                         local_key_buffer_->clear();\r
 146                         layer_key_buffer_->clear();\r
 147                         draw_buffer_->clear();\r
 148 \r
 149                         // Draw items in device.\r
 150 \r
 151                         while(!render_queue.empty())\r
 152                         {\r
 153                                 auto layer = render_queue.front();\r
 154                                 render_queue.pop();\r
 155                                 \r
 156                                 draw_buffer_->attach(); \r
 157 \r
 158                                 while(!layer.empty())\r
 159                                 {\r
 160                                         draw(layer.front());\r
 161                                         layer.pop();\r
 162                                         channel_.ogl().yield(); // Allow quick buffer allocation to execute.\r
 163                                 }\r
 164 \r
 165                                 layer_key_ = local_key_; // If there was only key in last layer then use it as key for the entire next layer.\r
 166                                 local_key_ = false;\r
 167 \r
 168                                 std::swap(local_key_buffer_, layer_key_buffer_);\r
 169                         }\r
 170 \r
 171                         std::swap(draw_buffer_, write_buffer_);\r
 172 \r
 173                         // Start transfer from device to host.  \r
 174                         read_buffer_ = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);                                      \r
 175                         write_buffer_->write(*read_buffer_);\r
 176                 });\r
 177 \r
 178                 return std::move(result.get());\r
 179         }\r
 180         \r
 181         void draw(const render_item& item)\r
 182         {               \r
 183                 // Bind textures\r
 184 \r
 185                 for(size_t n = 0; n < item.textures.size(); ++n)\r
 186                         item.textures[n]->bind(n);              \r
 187 \r
 188                 // Setup key and kernel\r
 189 \r
 190                 bool local_key = false;\r
 191                 bool layer_key = false;\r
 192                 \r
 193                 if(item.transform.get_is_key()) // This is a key frame, render it to the local_key buffer for later use.\r
 194                 {\r
 195                         if(!local_key_) // Initialize local-key if it is not active.\r
 196                         {\r
 197                                 local_key_buffer_->clear();\r
 198                                 local_key_buffer_->attach();\r
 199                                 local_key_ = true;\r
 200                         }\r
 201                 }               \r
 202                 else // This is a normal frame. Use key buffers if they are active.\r
 203                 {               \r
 204                         local_key = local_key_;\r
 205                         layer_key = layer_key_;\r
 206 \r
 207                         if(local_key_) // Use local key if we have it.\r
 208                         {\r
 209                                 local_key_buffer_->bind(LOCAL_KEY_INDEX);\r
 210                                 draw_buffer_->attach(); \r
 211                                 local_key_ = false; // Use it only one time.\r
 212                         }               \r
 213 \r
 214                         if(layer_key_) // Use layer key if we have it.\r
 215                                 layer_key_buffer_->bind(LAYER_KEY_INDEX);\r
 216                 }       \r
 217 \r
 218                 // Draw\r
 219 \r
 220                 kernel_.draw(channel_.get_format_desc().width, channel_.get_format_desc().height, item.desc, item.transform, local_key, layer_key);     \r
 221         }\r
 222                         \r
 223         safe_ptr<write_frame> create_frame(void* tag, const core::pixel_format_desc& desc)\r
 224         {\r
 225                 return make_safe<write_frame>(channel_.ogl(), reinterpret_cast<int>(tag), desc);\r
 226         }\r
 227 };\r
 228 \r
 229 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 230 void image_mixer::begin(const core::basic_frame& frame){impl_->begin(frame);}\r
 231 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 232 void image_mixer::end(){impl_->end();}\r
 233 safe_ptr<host_buffer> image_mixer::render(){return impl_->render();}\r
 234 safe_ptr<write_frame> image_mixer::create_frame(void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 235 void image_mixer::begin_layer(){impl_->begin_layer();}\r
 236 void image_mixer::end_layer(){impl_->end_layer();}\r
 237 \r
 238 }}