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         std::shared_ptr<device_buffer>                  write_buffer_;\r
  68 \r
  69         std::shared_ptr<device_buffer>                  local_key_buffer_;\r
  70         std::shared_ptr<device_buffer>                  layer_key_buffer_;\r
  71         \r
  72 public:\r
  73         implementation(video_channel_context& video_channel) \r
  74                 : channel_(video_channel)\r
  75                 , transform_stack_(1)\r
  76                 , mode_stack_(1, video_mode::progressive)\r
  77         {\r
  78                 initialize_buffers();\r
  79         }\r
  80 \r
  81         ~implementation()\r
  82         {\r
  83                 channel_.ogl().gc();\r
  84         }\r
  85 \r
  86         void initialize_buffers()\r
  87         {\r
  88                 write_buffer_                   = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
  89                 layer_key_buffer_               = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
  90                 draw_buffer_                    = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
  91                 local_key_buffer_               = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
  92                 channel_.ogl().gc();\r
  93         }\r
  94 \r
  95         void begin(core::basic_frame& frame)\r
  96         {\r
  97                 transform_stack_.push_back(transform_stack_.back()*frame.get_image_transform());\r
  98                 mode_stack_.push_back(frame.get_mode() == video_mode::progressive ? mode_stack_.back() : frame.get_mode());\r
  99         }\r
 100                 \r
 101         void visit(core::write_frame& frame)\r
 102         {       \r
 103                 CASPAR_ASSERT(!layers_.empty());\r
 104 \r
 105                 // Check if frame has been discarded by interlacing\r
 106                 if(boost::range::find(mode_stack_, video_mode::upper) != mode_stack_.end() && boost::range::find(mode_stack_, video_mode::lower) != mode_stack_.end())\r
 107                         return;\r
 108                 \r
 109                 core::render_item item(frame.get_pixel_format_desc(), frame.get_textures(), transform_stack_.back(), mode_stack_.back(), frame.tag());  \r
 110 \r
 111                 auto& layer = layers_.back();\r
 112 \r
 113                 auto it = boost::range::find(layer, item);\r
 114                 if(it == layer.end())\r
 115                         layer.push_back(item);\r
 116         }\r
 117 \r
 118         void end()\r
 119         {\r
 120                 transform_stack_.pop_back();\r
 121                 mode_stack_.pop_back();\r
 122         }\r
 123 \r
 124         void begin_layer()\r
 125         {\r
 126                 layers_.push_back(layer());\r
 127         }\r
 128 \r
 129         void end_layer()\r
 130         {\r
 131         }\r
 132         \r
 133         boost::unique_future<safe_ptr<host_buffer>> render()\r
 134         {               \r
 135                 auto layers = std::move(layers_);\r
 136                 return channel_.ogl().begin_invoke([=]()mutable{return render(std::move(layers));});\r
 137         }\r
 138         \r
 139         safe_ptr<host_buffer> render(std::deque<layer>&& layers)\r
 140         {\r
 141                 if(channel_.get_format_desc().width != write_buffer_->width() || channel_.get_format_desc().height != write_buffer_->height())\r
 142                         initialize_buffers();\r
 143                 \r
 144                 channel_.ogl().clear(*layer_key_buffer_);\r
 145                 channel_.ogl().clear(*local_key_buffer_);\r
 146                 channel_.ogl().clear(*draw_buffer_);\r
 147                 \r
 148                 bool layer_key = false;\r
 149                 \r
 150                 BOOST_FOREACH(auto& layer, layers)\r
 151                         draw(std::move(layer), layer_key);\r
 152 \r
 153                 std::swap(draw_buffer_, write_buffer_);\r
 154                 \r
 155                 auto host_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 156         \r
 157                 channel_.ogl().attach(*write_buffer_);\r
 158                 host_buffer->begin_read(write_buffer_->width(), write_buffer_->height(), format(write_buffer_->stride()));\r
 159                 \r
 160                 GL(glFlush());\r
 161 \r
 162                 return host_buffer;\r
 163         }\r
 164 \r
 165         void draw(layer&& layer, bool& layer_key)\r
 166         {                       \r
 167                 bool local_key = false;\r
 168                 \r
 169                 channel_.ogl().clear(*local_key_buffer_);\r
 170 \r
 171                 BOOST_FOREACH(auto& item, layer)\r
 172                         draw(std::move(item), local_key, layer_key);\r
 173                 \r
 174                 layer_key = local_key;\r
 175 \r
 176                 std::swap(local_key_buffer_, layer_key_buffer_);\r
 177         }\r
 178 \r
 179         void draw(render_item&& item, bool& local_key, bool& layer_key)\r
 180         {                                                                                       \r
 181                 if(item.transform.get_is_key())\r
 182                 {\r
 183                         draw(local_key_buffer_, std::move(item), nullptr, nullptr);\r
 184                         local_key = true;\r
 185                 }\r
 186                 else\r
 187                 {\r
 188                         draw(draw_buffer_, std::move(item), local_key ? local_key_buffer_ : nullptr, layer_key ? layer_key_buffer_ : nullptr);  \r
 189                         channel_.ogl().clear(*local_key_buffer_);\r
 190                         local_key = false;\r
 191                 }\r
 192         }\r
 193         \r
 194         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
 195         {\r
 196                 if(!std::all_of(item.textures.begin(), item.textures.end(), std::mem_fn(&device_buffer::ready)))\r
 197                 {\r
 198                         CASPAR_LOG(warning) << L"[image_mixer] Performance warning. Host to device transfer not complete, GPU will be stalled";\r
 199                         channel_.ogl().yield(); // Try to give it some more time.\r
 200                 }               \r
 201 \r
 202                 channel_.ogl().attach(*target);\r
 203                 kernel_.draw(channel_.ogl(), std::move(item), make_safe(target), local_key, layer_key);\r
 204         }\r
 205                                 \r
 206         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 207         {\r
 208                 return make_safe<write_frame>(channel_.ogl(), tag, desc);\r
 209         }\r
 210 };\r
 211 \r
 212 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 213 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 214 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 215 void image_mixer::end(){impl_->end();}\r
 216 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}\r
 217 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 218 void image_mixer::begin_layer(){impl_->begin_layer();}\r
 219 void image_mixer::end_layer(){impl_->end_layer();}\r
 220 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 221 {\r
 222         impl_ = std::move(other.impl_);\r
 223         return *this;\r
 224 }\r
 225 \r
 226 }}