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 \r
  24 #include "image_kernel.h"\r
  25 #include "../write_frame.h"\r
  26 #include "../gpu/ogl_device.h"\r
  27 #include "../gpu/host_buffer.h"\r
  28 #include "../gpu/device_buffer.h"\r
  29 #include "../../video_channel_context.h"\r
  30 \r
  31 #include <common/exception/exceptions.h>\r
  32 #include <common/gl/gl_check.h>\r
  33 #include <common/utility/move_on_copy.h>\r
  34 \r
  35 #include <core/producer/frame/frame_transform.h>\r
  36 #include <core/producer/frame/pixel_format.h>\r
  37 #include <core/video_format.h>\r
  38 \r
  39 #include <gl/glew.h>\r
  40 \r
  41 #include <boost/foreach.hpp>\r
  42 #include <boost/range/algorithm_ext/erase.hpp>\r
  43 \r
  44 #include <algorithm>\r
  45 #include <deque>\r
  46 \r
  47 using namespace boost::assign;\r
  48 \r
  49 namespace caspar { namespace core {\r
  50         \r
  51 struct item\r
  52 {\r
  53         pixel_format_desc                                               pix_desc;\r
  54         std::vector<safe_ptr<device_buffer>>    textures;\r
  55         frame_transform                                                 transform;\r
  56 };\r
  57 \r
  58 typedef std::pair<blend_mode::type, std::vector<item>> layer;\r
  59 \r
  60 class image_renderer\r
  61 {\r
  62         video_channel_context&                                  channel_;       \r
  63         image_kernel                                                    kernel_;        \r
  64         std::shared_ptr<device_buffer>                  active_buffer_;\r
  65 public:\r
  66         image_renderer(video_channel_context& channel)\r
  67                 : channel_(channel)\r
  68         {\r
  69         }\r
  70         \r
  71         boost::unique_future<safe_ptr<host_buffer>> render(std::vector<layer>&& layers)\r
  72         {               \r
  73                 auto layers2 = make_move_on_copy(std::move(layers));\r
  74                 return channel_.ogl().begin_invoke([=]\r
  75                 {\r
  76                         return do_render(std::move(layers2.value));\r
  77                 });\r
  78         }\r
  79         \r
  80 private:\r
  81         safe_ptr<host_buffer> do_render(std::vector<layer>&& layers)\r
  82         {\r
  83                 auto draw_buffer = create_mixer_buffer(4);\r
  84 \r
  85                 if(channel_.get_format_desc().field_mode != field_mode::progressive)\r
  86                 {\r
  87                         auto upper = layers;\r
  88                         auto lower = std::move(layers);\r
  89 \r
  90                         BOOST_FOREACH(auto& layer, upper)\r
  91                         {\r
  92                                 BOOST_FOREACH(auto& item, layer.second)\r
  93                                         item.transform.field_mode = static_cast<field_mode::type>(item.transform.field_mode & field_mode::upper);\r
  94                         }\r
  95 \r
  96                         BOOST_FOREACH(auto& layer, lower)\r
  97                         {\r
  98                                 BOOST_FOREACH(auto& item, layer.second)\r
  99                                         item.transform.field_mode = static_cast<field_mode::type>(item.transform.field_mode & field_mode::lower);\r
 100                         }\r
 101 \r
 102                         draw(std::move(upper), draw_buffer);\r
 103                         draw(std::move(lower), draw_buffer);\r
 104                 }\r
 105                 else\r
 106                 {\r
 107                         draw(std::move(layers), draw_buffer);\r
 108                 }\r
 109 \r
 110                 auto host_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 111                 channel_.ogl().attach(*draw_buffer);\r
 112                 host_buffer->begin_read(draw_buffer->width(), draw_buffer->height(), format(draw_buffer->stride()));\r
 113                 \r
 114                 active_buffer_ = std::move(draw_buffer);\r
 115 \r
 116                 channel_.ogl().flush(); // NOTE: This is important, otherwise fences will deadlock.\r
 117                         \r
 118                 return host_buffer;\r
 119         }\r
 120 \r
 121         void draw(std::vector<layer>&&          layers, \r
 122                           safe_ptr<device_buffer>&      draw_buffer)\r
 123         {\r
 124                 std::shared_ptr<device_buffer> layer_key_buffer;\r
 125 \r
 126                 BOOST_FOREACH(auto& layer, layers)\r
 127                         draw_layer(std::move(layer), draw_buffer, layer_key_buffer);\r
 128         }\r
 129 \r
 130         void draw_layer(layer&&                                                 layer, \r
 131                                         safe_ptr<device_buffer>&                draw_buffer,\r
 132                                         std::shared_ptr<device_buffer>& layer_key_buffer)\r
 133         {                               \r
 134                 boost::remove_erase_if(layer.second, [](const item& item){return item.transform.field_mode == field_mode::empty;});\r
 135 \r
 136                 if(layer.second.empty())\r
 137                         return;\r
 138 \r
 139                 std::shared_ptr<device_buffer> local_key_buffer;\r
 140                 std::shared_ptr<device_buffer> local_mix_buffer;\r
 141                                 \r
 142                 if(layer.first != blend_mode::normal && layer.second.size() > 1)\r
 143                 {\r
 144                         auto layer_draw_buffer = create_mixer_buffer(4);\r
 145 \r
 146                         BOOST_FOREACH(auto& item, layer.second)\r
 147                                 draw_item(std::move(item), layer_draw_buffer, layer_key_buffer, local_key_buffer, local_mix_buffer);    \r
 148                 \r
 149                         draw_mixer_buffer(layer_draw_buffer, std::move(local_mix_buffer), blend_mode::normal);                                                  \r
 150                         draw_mixer_buffer(draw_buffer, std::move(layer_draw_buffer), layer.first);\r
 151                 }\r
 152                 else // fast path\r
 153                 {\r
 154                         BOOST_FOREACH(auto& item, layer.second)         \r
 155                                 draw_item(std::move(item), draw_buffer, layer_key_buffer, local_key_buffer, local_mix_buffer);          \r
 156                                         \r
 157                         draw_mixer_buffer(draw_buffer, std::move(local_mix_buffer), blend_mode::normal);\r
 158                 }                                       \r
 159 \r
 160                 layer_key_buffer = std::move(local_key_buffer);\r
 161         }\r
 162 \r
 163         void draw_item(item&&                                                   item, \r
 164                                    safe_ptr<device_buffer>&                     draw_buffer, \r
 165                                    std::shared_ptr<device_buffer>&      layer_key_buffer, \r
 166                                    std::shared_ptr<device_buffer>&      local_key_buffer, \r
 167                                    std::shared_ptr<device_buffer>&      local_mix_buffer)\r
 168         {                       \r
 169                 draw_params draw_params;\r
 170                 draw_params.pix_desc                            = std::move(item.pix_desc);\r
 171                 draw_params.textures                            = std::move(item.textures);\r
 172                 draw_params.transform                           = std::move(item.transform);\r
 173 \r
 174                 if(item.transform.is_key)\r
 175                 {\r
 176                         local_key_buffer = local_key_buffer ? local_key_buffer : create_mixer_buffer(1);\r
 177 \r
 178                         draw_params.background                  = local_key_buffer;\r
 179                         draw_params.local_key                   = nullptr;\r
 180                         draw_params.layer_key                   = nullptr;\r
 181 \r
 182                         kernel_.draw(channel_.ogl(), std::move(draw_params));\r
 183                 }\r
 184                 else if(item.transform.is_mix)\r
 185                 {\r
 186                         local_mix_buffer = local_mix_buffer ? local_mix_buffer : create_mixer_buffer(4);\r
 187 \r
 188                         draw_params.background                  = local_mix_buffer;\r
 189                         draw_params.local_key                   = std::move(local_key_buffer);\r
 190                         draw_params.layer_key                   = layer_key_buffer;\r
 191 \r
 192                         draw_params.keyer                               = keyer::additive;\r
 193 \r
 194                         kernel_.draw(channel_.ogl(), std::move(draw_params));\r
 195                 }\r
 196                 else\r
 197                 {\r
 198                         draw_mixer_buffer(draw_buffer, std::move(local_mix_buffer), blend_mode::normal);\r
 199                         \r
 200                         draw_params.background                  = draw_buffer;\r
 201                         draw_params.local_key                   = std::move(local_key_buffer);\r
 202                         draw_params.layer_key                   = layer_key_buffer;\r
 203 \r
 204                         kernel_.draw(channel_.ogl(), std::move(draw_params));\r
 205                 }       \r
 206         }\r
 207 \r
 208         void draw_mixer_buffer(safe_ptr<device_buffer>&                 draw_buffer, \r
 209                                                    std::shared_ptr<device_buffer>&& source_buffer, \r
 210                                                    blend_mode::type                                     blend_mode = blend_mode::normal)\r
 211         {\r
 212                 if(!source_buffer)\r
 213                         return;\r
 214 \r
 215                 draw_params draw_params;\r
 216                 draw_params.pix_desc.pix_fmt    = pixel_format::bgra;\r
 217                 draw_params.pix_desc.planes             = list_of(pixel_format_desc::plane(source_buffer->width(), source_buffer->height(), 4));\r
 218                 draw_params.textures                    = list_of(source_buffer);\r
 219                 draw_params.transform                   = frame_transform();\r
 220                 draw_params.blend_mode                  = blend_mode;\r
 221                 draw_params.background                  = draw_buffer;\r
 222 \r
 223                 kernel_.draw(channel_.ogl(), std::move(draw_params));\r
 224         }\r
 225                         \r
 226         safe_ptr<device_buffer> create_mixer_buffer(size_t stride)\r
 227         {\r
 228                 auto buffer = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, stride);\r
 229                 channel_.ogl().clear(*buffer);\r
 230                 return buffer;\r
 231         }\r
 232 };\r
 233                 \r
 234 struct image_mixer::implementation : boost::noncopyable\r
 235 {       \r
 236         ogl_device&                                             ogl_;\r
 237         image_renderer                                  renderer_;\r
 238         std::vector<frame_transform>    transform_stack_;\r
 239         std::vector<layer>                              layers_; // layer/stream/items\r
 240 public:\r
 241         implementation(video_channel_context& video_channel) \r
 242                 : ogl_(video_channel.ogl())\r
 243                 , renderer_(video_channel)\r
 244                 , transform_stack_(1)   \r
 245         {\r
 246         }\r
 247 \r
 248         void begin_layer(blend_mode::type blend_mode)\r
 249         {\r
 250                 layers_.push_back(std::make_pair(blend_mode, std::vector<item>()));\r
 251         }\r
 252                 \r
 253         void begin(core::basic_frame& frame)\r
 254         {\r
 255                 transform_stack_.push_back(transform_stack_.back()*frame.get_frame_transform());\r
 256         }\r
 257                 \r
 258         void visit(core::write_frame& frame)\r
 259         {                       \r
 260                 item item;\r
 261                 item.pix_desc   = frame.get_pixel_format_desc();\r
 262                 item.textures   = frame.get_textures();\r
 263                 item.transform  = transform_stack_.back();\r
 264 \r
 265                 layers_.back().second.push_back(item);\r
 266         }\r
 267 \r
 268         void end()\r
 269         {\r
 270                 transform_stack_.pop_back();\r
 271         }\r
 272 \r
 273         void end_layer()\r
 274         {               \r
 275         }\r
 276         \r
 277         boost::unique_future<safe_ptr<host_buffer>> render()\r
 278         {\r
 279                 return renderer_.render(std::move(layers_));\r
 280         }\r
 281 \r
 282         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 283         {\r
 284                 return make_safe<write_frame>(ogl_, tag, desc);\r
 285         }\r
 286 };\r
 287 \r
 288 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 289 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 290 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 291 void image_mixer::end(){impl_->end();}\r
 292 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}\r
 293 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 294 void image_mixer::begin_layer(blend_mode::type blend_mode){impl_->begin_layer(blend_mode);}\r
 295 void image_mixer::end_layer(){impl_->end_layer();}\r
 296 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 297 {\r
 298         impl_ = std::move(other.impl_);\r
 299         return *this;\r
 300 }\r
 301 \r
 302 }}