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                 int                                                                      tag;\r
  57                 core::image_transform                            transform;\r
  58         };\r
  59 \r
  60         video_channel_context&                                  channel_;\r
  61         \r
  62         std::stack<core::image_transform>               transform_stack_;\r
  63         std::queue<std::queue<render_item>>             render_queue_;\r
  64         \r
  65         image_kernel                                                    kernel_;\r
  66                 \r
  67         safe_ptr<host_buffer>                                   read_buffer_;\r
  68         safe_ptr<device_buffer>                                 draw_buffer_;\r
  69         safe_ptr<device_buffer>                                 write_buffer_;\r
  70 \r
  71         safe_ptr<device_buffer>                                 local_key_buffer_;\r
  72         safe_ptr<device_buffer>                                 layer_key_buffer_;\r
  73 \r
  74         bool                                                                    local_key_;\r
  75         bool                                                                    layer_key_;\r
  76         \r
  77 public:\r
  78         implementation(video_channel_context& video_channel) \r
  79                 : channel_(video_channel)\r
  80                 , read_buffer_(video_channel.ogl().create_host_buffer(video_channel.get_format_desc().size, host_buffer::read_only))\r
  81                 , draw_buffer_(video_channel.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 4))\r
  82                 , write_buffer_ (video_channel.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 4))\r
  83                 , local_key_buffer_(video_channel.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 1))\r
  84                 , layer_key_buffer_(video_channel.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 1))\r
  85                 , local_key_(false)\r
  86                 , layer_key_(false)\r
  87         {\r
  88                 transform_stack_.push(core::image_transform());\r
  89 \r
  90                 channel_.ogl().invoke([=]\r
  91                 {\r
  92                         if(!GLEE_VERSION_3_0)\r
  93                                 CASPAR_LOG(warning) << "Missing OpenGL 3.0 support.";//BOOST_THROW_EXCEPTION(not_supported() << msg_info("Missing OpenGL 3.0 support."));\r
  94                 });\r
  95         }\r
  96 \r
  97         void begin(const core::basic_frame& frame)\r
  98         {\r
  99                 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());\r
 100         }\r
 101                 \r
 102         void visit(core::write_frame& frame)\r
 103         {                       \r
 104                 render_item item = {frame.get_pixel_format_desc(), frame.get_textures(), frame.tag(), transform_stack_.top()*frame.get_image_transform()};      \r
 105                 render_queue_.back().push(item);\r
 106         }\r
 107 \r
 108         void end()\r
 109         {\r
 110                 transform_stack_.pop();\r
 111         }\r
 112 \r
 113         void begin_layer()\r
 114         {\r
 115                 render_queue_.push(std::queue<render_item>());\r
 116         }\r
 117 \r
 118         void end_layer()\r
 119         {\r
 120         }\r
 121 \r
 122         void reinitialize_buffers()\r
 123         {\r
 124                 read_buffer_      = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 125                 draw_buffer_      = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
 126                 write_buffer_     = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
 127                 local_key_buffer_ = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
 128                 layer_key_buffer_ = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
 129                 channel_.ogl().gc();\r
 130         }\r
 131 \r
 132         safe_ptr<host_buffer> render()\r
 133         {               \r
 134                 auto read_buffer = read_buffer_;\r
 135                 auto result = channel_.ogl().begin_invoke([=]()  -> safe_ptr<host_buffer>\r
 136                 {\r
 137                         read_buffer->map();\r
 138                         return read_buffer;\r
 139                 });\r
 140 \r
 141                 auto render_queue = std::move(render_queue_);\r
 142 \r
 143                 channel_.ogl().begin_invoke([=]() mutable\r
 144                 {\r
 145                         if(draw_buffer_->width() != channel_.get_format_desc().width || draw_buffer_->height() != channel_.get_format_desc().height)\r
 146                                 reinitialize_buffers();\r
 147 \r
 148                         local_key_ = false;\r
 149                         layer_key_ = false;\r
 150 \r
 151                         // Clear buffers.\r
 152                         local_key_buffer_->clear();\r
 153                         layer_key_buffer_->clear();\r
 154                         draw_buffer_->clear();\r
 155 \r
 156                         // Draw items in device.\r
 157 \r
 158                         while(!render_queue.empty())\r
 159                         {\r
 160                                 auto layer = render_queue.front();\r
 161                                 render_queue.pop();\r
 162                                 \r
 163                                 draw_buffer_->attach(); \r
 164                                 \r
 165                                 while(!layer.empty())\r
 166                                 {\r
 167                                         // Split layer into streams\r
 168                                         std::vector<render_item> stream;\r
 169                                         do\r
 170                                         {\r
 171                                                 stream.push_back(layer.front());\r
 172                                                 layer.pop();\r
 173                                         }\r
 174                                         while(!layer.empty() && layer.front().tag == stream.front().tag);\r
 175 \r
 176                                         draw(stream);\r
 177 \r
 178                                         channel_.ogl().yield(); // Allow quick buffer allocation to execute.\r
 179                                 }\r
 180 \r
 181                                 layer_key_ = local_key_; // If there was only key in last layer then use it as key for the entire next layer.\r
 182                                 local_key_ = false;\r
 183 \r
 184                                 std::swap(local_key_buffer_, layer_key_buffer_);\r
 185                         }\r
 186 \r
 187                         std::swap(draw_buffer_, write_buffer_);\r
 188 \r
 189                         // Start transfer from device to host.  \r
 190                         read_buffer_ = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);                                      \r
 191                         write_buffer_->write(*read_buffer_);\r
 192                 });\r
 193 \r
 194                 return std::move(result.get());\r
 195         }\r
 196         \r
 197         void draw(const std::vector<render_item>& stream)\r
 198         {       \r
 199                 if(stream.empty())\r
 200                         return;                         \r
 201                 \r
 202                 BOOST_FOREACH(auto item, stream)\r
 203                 {\r
 204                         bool local_key = false;\r
 205                         bool layer_key = false;\r
 206 \r
 207                         // Setup key and kernel\r
 208                                         \r
 209                         if(item.transform.get_is_key()) // This is a key frame, render it to the local_key buffer for later use.\r
 210                         {\r
 211                                 if(!local_key_) // Initialize local-key if it is not active.\r
 212                                 {\r
 213                                         local_key_buffer_->clear();\r
 214                                         local_key_buffer_->attach();\r
 215                                         local_key_ = true;\r
 216                                 }\r
 217                         }               \r
 218                         else // This is a normal frame. Use key buffers if they are active.\r
 219                         {               \r
 220                                 local_key = local_key_;\r
 221                                 layer_key = layer_key_;\r
 222 \r
 223                                 if(local_key_) // Use local key if we have it.\r
 224                                 {\r
 225                                         local_key_buffer_->bind(LOCAL_KEY_INDEX);\r
 226                                         draw_buffer_->attach(); \r
 227                                 }               \r
 228 \r
 229                                 if(layer_key_) // Use layer key if we have it.\r
 230                                         layer_key_buffer_->bind(LAYER_KEY_INDEX);\r
 231                         }       \r
 232 \r
 233                         // Bind textures\r
 234 \r
 235                         for(size_t n = 0; n < item.textures.size(); ++n)\r
 236                                 item.textures[n]->bind(n);              \r
 237                         \r
 238                         // Draw\r
 239 \r
 240                         kernel_.draw(channel_.get_format_desc().width, channel_.get_format_desc().height, item.desc, item.transform, local_key, layer_key);     \r
 241                 }\r
 242 \r
 243                 local_key_ = stream.back().transform.get_is_key(); // Keep for next layer if last frame is key\r
 244         }\r
 245                         \r
 246         safe_ptr<write_frame> create_frame(void* tag, const core::pixel_format_desc& desc)\r
 247         {\r
 248                 return make_safe<write_frame>(channel_.ogl(), reinterpret_cast<int>(tag), desc);\r
 249         }\r
 250 };\r
 251 \r
 252 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 253 void image_mixer::begin(const core::basic_frame& frame){impl_->begin(frame);}\r
 254 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 255 void image_mixer::end(){impl_->end();}\r
 256 safe_ptr<host_buffer> image_mixer::render(){return impl_->render();}\r
 257 safe_ptr<write_frame> image_mixer::create_frame(void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 258 void image_mixer::begin_layer(){impl_->begin_layer();}\r
 259 void image_mixer::end_layer(){impl_->end_layer();}\r
 260 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 261 {\r
 262         impl_ = std::move(other.impl_);\r
 263         return *this;\r
 264 }\r
 265 \r
 266 }}