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_device_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::remove_erase_if(layer.second, [](const item& item){return !(item.transform.field_mode & field_mode::upper);});\r
  93                                 BOOST_FOREACH(auto& item, layer.second)\r
  94                                         item.transform.field_mode = field_mode::upper;\r
  95                         }\r
  96 \r
  97                         BOOST_FOREACH(auto& layer, lower)\r
  98                         {\r
  99                                 boost::remove_erase_if(layer.second, [](const item& item){return !(item.transform.field_mode & field_mode::lower);});\r
 100                                 BOOST_FOREACH(auto& item, layer.second)\r
 101                                         item.transform.field_mode = field_mode::lower;\r
 102                         }\r
 103 \r
 104                         draw(std::move(upper), draw_buffer);\r
 105                         draw(std::move(lower), draw_buffer);\r
 106                 }\r
 107                 else\r
 108                 {\r
 109                         draw(std::move(layers), draw_buffer);\r
 110                 }\r
 111 \r
 112                 auto host_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 113                 channel_.ogl().attach(*draw_buffer);\r
 114                 host_buffer->begin_read(draw_buffer->width(), draw_buffer->height(), format(draw_buffer->stride()));\r
 115                 \r
 116                 active_buffer_ = draw_buffer;\r
 117 \r
 118                 channel_.ogl().flush(); // NOTE: This is important, otherwise fences will deadlock.\r
 119                         \r
 120                 return host_buffer;\r
 121         }\r
 122 \r
 123         void draw(std::vector<layer>&&          layers, \r
 124                           safe_ptr<device_buffer>&      draw_buffer)\r
 125         {\r
 126                 std::shared_ptr<device_buffer> layer_key_buffer;\r
 127 \r
 128                 BOOST_FOREACH(auto& layer, layers)\r
 129                         draw_layer(std::move(layer), draw_buffer, layer_key_buffer);\r
 130         }\r
 131 \r
 132         void draw_layer(layer&&                                                 layer, \r
 133                                         safe_ptr<device_buffer>&                draw_buffer,\r
 134                                         std::shared_ptr<device_buffer>& layer_key_buffer)\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_device_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_device_buffer(layer_draw_buffer, std::move(local_mix_buffer), blend_mode::normal);                                                 \r
 150                         draw_device_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_device_buffer(draw_buffer, std::move(local_mix_buffer), blend_mode::normal);\r
 158                 }                                       \r
 159 \r
 160                 std::swap(local_key_buffer, layer_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_device_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_device_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_device_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_device_buffer(safe_ptr<device_buffer>& draw_buffer, std::shared_ptr<device_buffer>&& source_buffer, blend_mode::type blend_mode = blend_mode::normal)\r
 209         {\r
 210                 if(!source_buffer)\r
 211                         return;\r
 212 \r
 213                 draw_params draw_params;\r
 214                 draw_params.pix_desc.pix_fmt    = pixel_format::bgra;\r
 215                 draw_params.pix_desc.planes             = list_of(pixel_format_desc::plane(source_buffer->width(), source_buffer->height(), 4));\r
 216                 draw_params.textures                    = list_of(source_buffer);\r
 217                 draw_params.transform                   = frame_transform();\r
 218                 draw_params.blend_mode                  = blend_mode;\r
 219                 draw_params.background                  = draw_buffer;\r
 220 \r
 221                 kernel_.draw(channel_.ogl(), std::move(draw_params));\r
 222         }\r
 223                         \r
 224         safe_ptr<device_buffer> create_device_buffer(size_t stride)\r
 225         {\r
 226                 auto buffer = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, stride);\r
 227                 channel_.ogl().clear(*buffer);\r
 228                 return buffer;\r
 229         }\r
 230 };\r
 231                 \r
 232 struct image_mixer::implementation : boost::noncopyable\r
 233 {       \r
 234         ogl_device&                                             ogl_;\r
 235         image_renderer                                  renderer_;\r
 236         std::vector<frame_transform>    transform_stack_;\r
 237         std::vector<layer>                              layers_; // layer/stream/items\r
 238 public:\r
 239         implementation(video_channel_context& video_channel) \r
 240                 : ogl_(video_channel.ogl())\r
 241                 , renderer_(video_channel)\r
 242                 , transform_stack_(1)   \r
 243         {\r
 244         }\r
 245 \r
 246         void begin_layer(blend_mode::type blend_mode)\r
 247         {\r
 248                 layers_.push_back(std::make_pair(blend_mode, std::vector<item>()));\r
 249         }\r
 250                 \r
 251         void begin(core::basic_frame& frame)\r
 252         {\r
 253                 transform_stack_.push_back(transform_stack_.back()*frame.get_frame_transform());\r
 254         }\r
 255                 \r
 256         void visit(core::write_frame& frame)\r
 257         {                       \r
 258                 if(frame.get_frame_transform().field_mode == field_mode::empty)\r
 259                         return;\r
 260 \r
 261                 item item;\r
 262                 item.pix_desc   = frame.get_pixel_format_desc();\r
 263                 item.textures   = frame.get_textures();\r
 264                 item.transform  = transform_stack_.back();\r
 265 \r
 266                 layers_.back().second.push_back(item);\r
 267         }\r
 268 \r
 269         void end()\r
 270         {\r
 271                 transform_stack_.pop_back();\r
 272         }\r
 273 \r
 274         void end_layer()\r
 275         {               \r
 276         }\r
 277         \r
 278         boost::unique_future<safe_ptr<host_buffer>> render()\r
 279         {\r
 280                 return renderer_.render(std::move(layers_));\r
 281         }\r
 282 \r
 283         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 284         {\r
 285                 return make_safe<write_frame>(ogl_, tag, desc);\r
 286         }\r
 287 };\r
 288 \r
 289 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 290 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 291 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 292 void image_mixer::end(){impl_->end();}\r
 293 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}\r
 294 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 295 void image_mixer::begin_layer(blend_mode::type blend_mode){impl_->begin_layer(blend_mode);}\r
 296 void image_mixer::end_layer(){impl_->end_layer();}\r
 297 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 298 {\r
 299         impl_ = std::move(other.impl_);\r
 300         return *this;\r
 301 }\r
 302 \r
 303 }}