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         }\r
  79 \r
  80         ~implementation()\r
  81         {\r
  82                 channel_.ogl().gc();\r
  83         }\r
  84 \r
  85         void initialize_buffers()\r
  86         {\r
  87                 write_buffer_.reset();  \r
  88                 layer_key_buffer_.reset();\r
  89                 draw_buffer_.reset();   \r
  90                 local_key_buffer_.reset();\r
  91 \r
  92                 channel_.ogl().gc();\r
  93 \r
  94                 write_buffer_                   = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
  95                 layer_key_buffer_               = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
  96                 draw_buffer_                    = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
  97                 local_key_buffer_               = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
  98         }\r
  99 \r
 100         void begin(core::basic_frame& frame)\r
 101         {\r
 102                 transform_stack_.push_back(transform_stack_.back()*frame.get_image_transform());\r
 103                 mode_stack_.push_back(frame.get_mode() == video_mode::progressive ? mode_stack_.back() : frame.get_mode());\r
 104         }\r
 105                 \r
 106         void visit(core::write_frame& frame)\r
 107         {       \r
 108                 CASPAR_ASSERT(!layers_.empty());\r
 109 \r
 110                 // Check if frame has been discarded by interlacing\r
 111                 if(boost::range::find(mode_stack_, video_mode::upper) != mode_stack_.end() && boost::range::find(mode_stack_, video_mode::lower) != mode_stack_.end())\r
 112                         return;\r
 113                 \r
 114                 core::render_item item(frame.get_pixel_format_desc(), frame.get_textures(), transform_stack_.back(), mode_stack_.back(), frame.tag());  \r
 115 \r
 116                 auto& layer = layers_.back();\r
 117 \r
 118                 if(boost::range::find(layer, item) == layer.end())\r
 119                         layer.push_back(item);\r
 120         }\r
 121 \r
 122         void end()\r
 123         {\r
 124                 transform_stack_.pop_back();\r
 125                 mode_stack_.pop_back();\r
 126         }\r
 127 \r
 128         void begin_layer()\r
 129         {\r
 130                 layers_.push_back(layer());\r
 131         }\r
 132 \r
 133         void end_layer()\r
 134         {\r
 135         }\r
 136         \r
 137         boost::unique_future<safe_ptr<host_buffer>> render()\r
 138         {               \r
 139                 auto layers = std::move(layers_);\r
 140                 return channel_.ogl().begin_invoke([=]()mutable\r
 141                 {\r
 142                         return render(std::move(layers));\r
 143                 });\r
 144         }\r
 145         \r
 146         safe_ptr<host_buffer> render(std::deque<layer>&& layers)\r
 147         {\r
 148                 if(!write_buffer_ || channel_.get_format_desc().width != write_buffer_->width() || channel_.get_format_desc().height != write_buffer_->height())\r
 149                         initialize_buffers();\r
 150                                 \r
 151                 channel_.ogl().clear(*layer_key_buffer_);\r
 152                 channel_.ogl().clear(*local_key_buffer_);\r
 153                 channel_.ogl().clear(*draw_buffer_);\r
 154                 \r
 155                 bool layer_key = false;\r
 156                 \r
 157                 BOOST_FOREACH(auto& layer, layers)\r
 158                         draw(std::move(layer), layer_key);\r
 159 \r
 160                 std::swap(draw_buffer_, write_buffer_);\r
 161                 \r
 162                 auto host_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 163         \r
 164                 channel_.ogl().attach(*write_buffer_);\r
 165                 host_buffer->begin_read(write_buffer_->width(), write_buffer_->height(), format(write_buffer_->stride()));\r
 166                 \r
 167                 GL(glFlush());\r
 168                 \r
 169                 return host_buffer;\r
 170         }\r
 171 \r
 172         void draw(layer&& layer, bool& layer_key)\r
 173         {                       \r
 174                 bool local_key = false;\r
 175                 \r
 176                 channel_.ogl().clear(*local_key_buffer_);\r
 177 \r
 178                 BOOST_FOREACH(auto& item, layer)\r
 179                         draw(std::move(item), local_key, layer_key);\r
 180                 \r
 181                 layer_key = local_key;\r
 182 \r
 183                 std::swap(local_key_buffer_, layer_key_buffer_);\r
 184         }\r
 185 \r
 186         void draw(render_item&& item, bool& local_key, bool& layer_key)\r
 187         {                                                                                       \r
 188                 if(item.transform.get_is_key())\r
 189                 {\r
 190                         draw(local_key_buffer_, std::move(item), nullptr, nullptr);\r
 191                         local_key = true;\r
 192                 }\r
 193                 else\r
 194                 {\r
 195                         draw(draw_buffer_, std::move(item), local_key ? local_key_buffer_ : nullptr, layer_key ? layer_key_buffer_ : nullptr);  \r
 196                         channel_.ogl().clear(*local_key_buffer_);\r
 197                         local_key = false;\r
 198                 }\r
 199         }\r
 200         \r
 201         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
 202         {\r
 203                 if(!std::all_of(item.textures.begin(), item.textures.end(), std::mem_fn(&device_buffer::ready)))\r
 204                 {\r
 205                         CASPAR_LOG(warning) << L"[image_mixer] Performance warning. Host to device transfer not complete, GPU will be stalled";\r
 206                         channel_.ogl().yield(); // Try to give it some more time.\r
 207                 }               \r
 208 \r
 209                 kernel_.draw(channel_.ogl(), std::move(item), make_safe(target), local_key, layer_key);\r
 210         }\r
 211                                 \r
 212         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 213         {\r
 214                 return make_safe<write_frame>(channel_.ogl(), tag, desc);\r
 215         }\r
 216 };\r
 217 \r
 218 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 219 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 220 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 221 void image_mixer::end(){impl_->end();}\r
 222 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}\r
 223 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 224 void image_mixer::begin_layer(){impl_->begin_layer();}\r
 225 void image_mixer::end_layer(){impl_->end_layer();}\r
 226 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 227 {\r
 228         impl_ = std::move(other.impl_);\r
 229         return *this;\r
 230 }\r
 231 \r
 232 }}