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 <gl/glew.h>\r
  41 \r
  42 #include <boost/foreach.hpp>\r
  43 #include <boost/range.hpp>\r
  44 #include <boost/range/algorithm/find.hpp>\r
  45 \r
  46 #include <algorithm>\r
  47 #include <array>\r
  48 #include <deque>\r
  49 #include <unordered_map>\r
  50 \r
  51 namespace caspar { namespace core {\r
  52                 \r
  53 struct image_mixer::implementation : boost::noncopyable\r
  54 {               \r
  55         typedef std::deque<render_item>                 layer;\r
  56 \r
  57         video_channel_context&                                  channel_;\r
  58 \r
  59         std::vector<image_transform>                    transform_stack_;\r
  60         std::vector<video_mode::type>                   mode_stack_;\r
  61 \r
  62         std::deque<std::deque<render_item>>             layers_; // layer/stream/items\r
  63         \r
  64         image_kernel                                                    kernel_;\r
  65                 \r
  66         std::shared_ptr<device_buffer>                  draw_buffer_;\r
  67 \r
  68         std::shared_ptr<device_buffer>                  local_key_buffer_;\r
  69         std::shared_ptr<device_buffer>                  layer_key_buffer_;\r
  70                 \r
  71 public:\r
  72         implementation(video_channel_context& video_channel) \r
  73                 : channel_(video_channel)\r
  74                 , transform_stack_(1)\r
  75                 , mode_stack_(1, video_mode::progressive)\r
  76         {\r
  77         }\r
  78 \r
  79         ~implementation()\r
  80         {\r
  81                 channel_.ogl().gc();\r
  82         }\r
  83         \r
  84         void begin(core::basic_frame& frame)\r
  85         {\r
  86                 transform_stack_.push_back(transform_stack_.back()*frame.get_image_transform());\r
  87                 mode_stack_.push_back(frame.get_mode() == video_mode::progressive ? mode_stack_.back() : frame.get_mode());\r
  88         }\r
  89                 \r
  90         void visit(core::write_frame& frame)\r
  91         {       \r
  92                 CASPAR_ASSERT(!layers_.empty());\r
  93 \r
  94                 // Check if frame has been discarded by interlacing\r
  95                 if(boost::range::find(mode_stack_, video_mode::upper) != mode_stack_.end() && boost::range::find(mode_stack_, video_mode::lower) != mode_stack_.end())\r
  96                         return;\r
  97                 \r
  98                 core::render_item item(frame.get_pixel_format_desc(), frame.get_textures(), transform_stack_.back(), mode_stack_.back(), frame.tag());  \r
  99 \r
 100                 auto& layer = layers_.back();\r
 101 \r
 102                 if(boost::range::find(layer, item) == layer.end())\r
 103                         layer.push_back(item);\r
 104         }\r
 105 \r
 106         void end()\r
 107         {\r
 108                 transform_stack_.pop_back();\r
 109                 mode_stack_.pop_back();\r
 110         }\r
 111 \r
 112         void begin_layer()\r
 113         {\r
 114                 layers_.push_back(layer());\r
 115         }\r
 116 \r
 117         void end_layer()\r
 118         {\r
 119         }\r
 120         \r
 121         boost::unique_future<safe_ptr<host_buffer>> render()\r
 122         {               \r
 123                 auto layers = std::move(layers_);\r
 124                 return channel_.ogl().begin_invoke([=]()mutable\r
 125                 {\r
 126                         return render(std::move(layers));\r
 127                 });\r
 128         }\r
 129         \r
 130         safe_ptr<host_buffer> render(std::deque<layer>&& layers)\r
 131         {\r
 132                 draw_buffer_ = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);                             \r
 133                 channel_.ogl().clear(*draw_buffer_);\r
 134                                 \r
 135                 BOOST_FOREACH(auto& layer, layers)\r
 136                         draw(std::move(layer));\r
 137                                 \r
 138                 auto host_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 139                 channel_.ogl().attach(*draw_buffer_);\r
 140                 host_buffer->begin_read(draw_buffer_->width(), draw_buffer_->height(), format(draw_buffer_->stride()));\r
 141                 \r
 142                 GL(glFlush());\r
 143                 \r
 144                 return host_buffer;\r
 145         }\r
 146 \r
 147         void draw(layer&& layer)\r
 148         {                                       \r
 149                 local_key_buffer_.reset();\r
 150 \r
 151                 BOOST_FOREACH(auto& item, layer)\r
 152                         draw(std::move(item));\r
 153                 \r
 154                 std::swap(local_key_buffer_, layer_key_buffer_);\r
 155         }\r
 156 \r
 157         void draw(render_item&& item)\r
 158         {                                                                                       \r
 159                 if(item.transform.get_is_key())\r
 160                 {\r
 161                         if(!local_key_buffer_)\r
 162                         {\r
 163                                 local_key_buffer_ = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
 164                                 channel_.ogl().clear(*local_key_buffer_);\r
 165                         }\r
 166 \r
 167                         draw(local_key_buffer_, std::move(item), nullptr, nullptr);\r
 168                 }\r
 169                 else\r
 170                 {\r
 171                         draw(draw_buffer_, std::move(item), local_key_buffer_, layer_key_buffer_);      \r
 172                         local_key_buffer_.reset();\r
 173                 }\r
 174         }\r
 175         \r
 176         void draw(std::shared_ptr<device_buffer>& target, render_item&& item, const std::shared_ptr<device_buffer>& local_key, const std::shared_ptr<device_buffer>& layer_key)\r
 177         {\r
 178                 if(!std::all_of(item.textures.begin(), item.textures.end(), std::mem_fn(&device_buffer::ready)))\r
 179                 {\r
 180                         CASPAR_LOG(warning) << L"[image_mixer] Performance warning. Host to device transfer not complete, GPU will be stalled";\r
 181                         channel_.ogl().yield(); // Try to give it some more time.\r
 182                 }               \r
 183 \r
 184                 kernel_.draw(channel_.ogl(), std::move(item), make_safe(target), local_key, layer_key);\r
 185         }\r
 186                                 \r
 187         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 188         {\r
 189                 return make_safe<write_frame>(channel_.ogl(), tag, desc);\r
 190         }\r
 191 };\r
 192 \r
 193 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 194 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 195 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 196 void image_mixer::end(){impl_->end();}\r
 197 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}\r
 198 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 199 void image_mixer::begin_layer(){impl_->begin_layer();}\r
 200 void image_mixer::end_layer(){impl_->end_layer();}\r
 201 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 202 {\r
 203         impl_ = std::move(other.impl_);\r
 204         return *this;\r
 205 }\r
 206 \r
 207 }}