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 render_item\r
  48 {\r
  49         pixel_format_desc                                        desc;\r
  50         std::vector<safe_ptr<device_buffer>> textures;\r
  51         core::image_transform                            transform;\r
  52         int                                                                      tag;\r
  53 };\r
  54 \r
  55 struct image_mixer::implementation : boost::noncopyable\r
  56 {       \r
  57         static const size_t LOCAL_KEY_INDEX = 3;\r
  58         static const size_t LAYER_KEY_INDEX = 4;\r
  59         \r
  60         video_channel_context&                                  channel_;\r
  61         \r
  62         std::stack<core::image_transform>               transform_stack_;\r
  63 \r
  64         std::queue<std::queue<std::queue<render_item>>> render_queue_; // layer/stream/items\r
  65         \r
  66         image_kernel                                                    kernel_;\r
  67                 \r
  68         safe_ptr<device_buffer>                                 draw_buffer_;\r
  69         safe_ptr<device_buffer>                                 write_buffer_;\r
  70 \r
  71         safe_ptr<device_buffer>                                 stream_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                 , 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                 , stream_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                 channel_.ogl().invoke([=]\r
  90                 {\r
  91                         if(!GLEE_VERSION_3_0)\r
  92                                 CASPAR_LOG(warning) << "Missing OpenGL 3.0 support.";//BOOST_THROW_EXCEPTION(not_supported() << msg_info("Missing OpenGL 3.0 support."));\r
  93                 });\r
  94         }\r
  95 \r
  96         void begin(core::basic_frame& frame)\r
  97         {\r
  98                 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());\r
  99         }\r
 100                 \r
 101         void visit(core::write_frame& frame)\r
 102         {                       \r
 103                 render_item item = {frame.get_pixel_format_desc(), frame.get_textures(), transform_stack_.top()*frame.get_image_transform(), frame.tag()};      \r
 104 \r
 105                 auto& layer = render_queue_.back();\r
 106 \r
 107                 if(layer.empty() || (!layer.back().empty() && layer.back().back().tag != frame.tag()))\r
 108                         layer.push(std::queue<render_item>());\r
 109                 \r
 110                 layer.back().push(item);\r
 111         }\r
 112 \r
 113         void end()\r
 114         {\r
 115                 transform_stack_.pop();\r
 116         }\r
 117 \r
 118         void begin_layer()\r
 119         {\r
 120                 render_queue_.push(std::queue<std::queue<render_item>>());\r
 121         }\r
 122 \r
 123         void end_layer()\r
 124         {\r
 125         }\r
 126 \r
 127         void reinitialize_buffers()\r
 128         {\r
 129                 draw_buffer_       = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
 130                 write_buffer_      = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
 131                 stream_key_buffer_ = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
 132                 layer_key_buffer_  = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
 133                 channel_.ogl().gc();\r
 134         }\r
 135 \r
 136         safe_ptr<host_buffer> render()\r
 137         {               \r
 138                 auto render_queue = std::move(render_queue_);\r
 139 \r
 140                 return channel_.ogl().invoke([=]() mutable -> safe_ptr<host_buffer>\r
 141                 {\r
 142                         if(draw_buffer_->width() != channel_.get_format_desc().width || draw_buffer_->height() != channel_.get_format_desc().height)\r
 143                                 reinitialize_buffers();\r
 144                         \r
 145                         return do_render(std::move(render_queue));\r
 146                 });\r
 147         }\r
 148         \r
 149         safe_ptr<host_buffer> do_render(std::queue<std::queue<std::queue<render_item>>>&& render_queue)\r
 150         {\r
 151                 auto read_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 152 \r
 153                 layer_key_buffer_->clear();\r
 154                 draw_buffer_->clear();\r
 155 \r
 156                 while(!render_queue.empty())\r
 157                 {                       \r
 158                         stream_key_buffer_->clear();\r
 159 \r
 160                         auto layer = std::move(render_queue.front());\r
 161                         render_queue.pop();\r
 162                                                                                         \r
 163                         while(!layer.empty())\r
 164                         {\r
 165                                 auto stream = std::move(layer.front());\r
 166                                 layer.pop();\r
 167 \r
 168                                 bool last_is_key = stream.empty() ? false : stream.back().transform.get_is_key();\r
 169 \r
 170                                 while(!stream.empty())\r
 171                                 {\r
 172                                         auto item = std::move(stream.front());\r
 173                                         stream.pop();\r
 174 \r
 175                                         render(item);\r
 176 \r
 177                                         channel_.ogl().yield(); // Allow quick buffer allocation to execute.\r
 178                                 }               \r
 179 \r
 180                                 if(!last_is_key)\r
 181                                         stream_key_buffer_->clear();\r
 182                         }\r
 183 \r
 184                         std::swap(stream_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                 write_buffer_->write(*read_buffer);\r
 191 \r
 192                 return read_buffer;\r
 193         }\r
 194 \r
 195         void render(render_item& item)\r
 196         {\r
 197                 for(size_t n = 0; n < item.textures.size(); ++n)\r
 198                         item.textures[n]->bind(n);      \r
 199                                 \r
 200                 if(item.transform.get_is_key())\r
 201                 {\r
 202                         stream_key_buffer_->attach();\r
 203 \r
 204                         kernel_.draw(channel_.get_format_desc().width, channel_.get_format_desc().height, item.desc, item.transform, false, false);     \r
 205                 }\r
 206                 else\r
 207                 {\r
 208                         stream_key_buffer_->bind(LOCAL_KEY_INDEX);      \r
 209                         layer_key_buffer_->bind(LAYER_KEY_INDEX);\r
 210                                 \r
 211                         draw_buffer_->attach(); \r
 212 \r
 213                         kernel_.draw(channel_.get_format_desc().width, channel_.get_format_desc().height, item.desc, item.transform, !stream_key_buffer_->empty(), !layer_key_buffer_->empty());        \r
 214                 }\r
 215         }\r
 216                                 \r
 217         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 218         {\r
 219                 return make_safe<write_frame>(channel_.ogl(), reinterpret_cast<int>(tag), desc);\r
 220         }\r
 221 };\r
 222 \r
 223 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 224 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 225 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 226 void image_mixer::end(){impl_->end();}\r
 227 safe_ptr<host_buffer> image_mixer::render(){return impl_->render();}\r
 228 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 229 void image_mixer::begin_layer(){impl_->begin_layer();}\r
 230 void image_mixer::end_layer(){impl_->end_layer();}\r
 231 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 232 {\r
 233         impl_ = std::move(other.impl_);\r
 234         return *this;\r
 235 }\r
 236 \r
 237 }}