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