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         ogl_device&                                                             ogl_;\r
  63         const video_format_desc                                 format_desc_;\r
  64         image_kernel                                                    kernel_;        \r
  65         std::shared_ptr<device_buffer>                  transferring_buffer_;\r
  66 public:\r
  67         image_renderer(ogl_device& ogl, const video_format_desc& format_desc)\r
  68                 : ogl_(ogl)\r
  69                 , format_desc_(format_desc)\r
  70         {\r
  71         }\r
  72         \r
  73         boost::unique_future<safe_ptr<host_buffer>> operator()(std::vector<layer>&& layers)\r
  74         {               \r
  75                 auto layers2 = make_move_on_copy(std::move(layers));\r
  76                 return ogl_.begin_invoke([=]\r
  77                 {\r
  78                         return do_render(std::move(layers2.value));\r
  79                 });\r
  80         }\r
  81         \r
  82 private:\r
  83         safe_ptr<host_buffer> do_render(std::vector<layer>&& layers)\r
  84         {\r
  85                 auto draw_buffer = create_mixer_buffer(4);\r
  86 \r
  87                 if(format_desc_.field_mode != field_mode::progressive)\r
  88                 {\r
  89                         auto upper = layers;\r
  90                         auto lower = std::move(layers);\r
  91 \r
  92                         BOOST_FOREACH(auto& layer, upper)\r
  93                         {\r
  94                                 BOOST_FOREACH(auto& item, layer.second)\r
  95                                         item.transform.field_mode = static_cast<field_mode::type>(item.transform.field_mode & field_mode::upper);\r
  96                         }\r
  97 \r
  98                         BOOST_FOREACH(auto& layer, lower)\r
  99                         {\r
 100                                 BOOST_FOREACH(auto& item, layer.second)\r
 101                                         item.transform.field_mode = static_cast<field_mode::type>(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 = ogl_.create_host_buffer(format_desc_.size, host_buffer::read_only);\r
 113                 ogl_.attach(*draw_buffer);\r
 114                 host_buffer->begin_read(draw_buffer->width(), draw_buffer->height(), format(draw_buffer->stride()));\r
 115                 \r
 116                 transferring_buffer_ = std::move(draw_buffer);\r
 117 \r
 118                 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                 boost::remove_erase_if(layer.second, [](const item& item){return item.transform.field_mode == field_mode::empty;});\r
 137 \r
 138                 if(layer.second.empty())\r
 139                         return;\r
 140 \r
 141                 std::shared_ptr<device_buffer> local_key_buffer;\r
 142                 std::shared_ptr<device_buffer> local_mix_buffer;\r
 143                                 \r
 144                 if(layer.first != blend_mode::normal && layer.second.size() > 1)\r
 145                 {\r
 146                         auto layer_draw_buffer = create_mixer_buffer(4);\r
 147 \r
 148                         BOOST_FOREACH(auto& item, layer.second)\r
 149                                 draw_item(std::move(item), layer_draw_buffer, layer_key_buffer, local_key_buffer, local_mix_buffer);    \r
 150                 \r
 151                         draw_mixer_buffer(layer_draw_buffer, std::move(local_mix_buffer), blend_mode::normal);                                                  \r
 152                         draw_mixer_buffer(draw_buffer, std::move(layer_draw_buffer), layer.first);\r
 153                 }\r
 154                 else // fast path\r
 155                 {\r
 156                         BOOST_FOREACH(auto& item, layer.second)         \r
 157                                 draw_item(std::move(item), draw_buffer, layer_key_buffer, local_key_buffer, local_mix_buffer);          \r
 158                                         \r
 159                         draw_mixer_buffer(draw_buffer, std::move(local_mix_buffer), blend_mode::normal);\r
 160                 }                                       \r
 161 \r
 162                 layer_key_buffer = std::move(local_key_buffer);\r
 163         }\r
 164 \r
 165         void draw_item(item&&                                                   item, \r
 166                                    safe_ptr<device_buffer>&                     draw_buffer, \r
 167                                    std::shared_ptr<device_buffer>&      layer_key_buffer, \r
 168                                    std::shared_ptr<device_buffer>&      local_key_buffer, \r
 169                                    std::shared_ptr<device_buffer>&      local_mix_buffer)\r
 170         {                       \r
 171                 draw_params draw_params;\r
 172                 draw_params.pix_desc                            = std::move(item.pix_desc);\r
 173                 draw_params.textures                            = std::move(item.textures);\r
 174                 draw_params.transform                           = std::move(item.transform);\r
 175 \r
 176                 if(item.transform.is_key)\r
 177                 {\r
 178                         local_key_buffer = local_key_buffer ? local_key_buffer : create_mixer_buffer(1);\r
 179 \r
 180                         draw_params.background                  = local_key_buffer;\r
 181                         draw_params.local_key                   = nullptr;\r
 182                         draw_params.layer_key                   = nullptr;\r
 183 \r
 184                         kernel_.draw(ogl_, std::move(draw_params));\r
 185                 }\r
 186                 else if(item.transform.is_mix)\r
 187                 {\r
 188                         local_mix_buffer = local_mix_buffer ? local_mix_buffer : create_mixer_buffer(4);\r
 189 \r
 190                         draw_params.background                  = local_mix_buffer;\r
 191                         draw_params.local_key                   = std::move(local_key_buffer);\r
 192                         draw_params.layer_key                   = layer_key_buffer;\r
 193 \r
 194                         draw_params.keyer                               = keyer::additive;\r
 195 \r
 196                         kernel_.draw(ogl_, std::move(draw_params));\r
 197                 }\r
 198                 else\r
 199                 {\r
 200                         draw_mixer_buffer(draw_buffer, std::move(local_mix_buffer), blend_mode::normal);\r
 201                         \r
 202                         draw_params.background                  = draw_buffer;\r
 203                         draw_params.local_key                   = std::move(local_key_buffer);\r
 204                         draw_params.layer_key                   = layer_key_buffer;\r
 205 \r
 206                         kernel_.draw(ogl_, std::move(draw_params));\r
 207                 }       \r
 208         }\r
 209 \r
 210         void draw_mixer_buffer(safe_ptr<device_buffer>&                 draw_buffer, \r
 211                                                    std::shared_ptr<device_buffer>&& source_buffer, \r
 212                                                    blend_mode::type                                     blend_mode = blend_mode::normal)\r
 213         {\r
 214                 if(!source_buffer)\r
 215                         return;\r
 216 \r
 217                 draw_params draw_params;\r
 218                 draw_params.pix_desc.pix_fmt    = pixel_format::bgra;\r
 219                 draw_params.pix_desc.planes             = list_of(pixel_format_desc::plane(source_buffer->width(), source_buffer->height(), 4));\r
 220                 draw_params.textures                    = list_of(source_buffer);\r
 221                 draw_params.transform                   = frame_transform();\r
 222                 draw_params.blend_mode                  = blend_mode;\r
 223                 draw_params.background                  = draw_buffer;\r
 224 \r
 225                 kernel_.draw(ogl_, std::move(draw_params));\r
 226         }\r
 227                         \r
 228         safe_ptr<device_buffer> create_mixer_buffer(size_t stride)\r
 229         {\r
 230                 auto buffer = ogl_.create_device_buffer(format_desc_.width, format_desc_.height, stride);\r
 231                 ogl_.clear(*buffer);\r
 232                 return buffer;\r
 233         }\r
 234 };\r
 235                 \r
 236 struct image_mixer::implementation : boost::noncopyable\r
 237 {       \r
 238         ogl_device&                                             ogl_;\r
 239         image_renderer                                  renderer_;\r
 240         std::vector<frame_transform>    transform_stack_;\r
 241         std::vector<layer>                              layers_; // layer/stream/items\r
 242 public:\r
 243         implementation(ogl_device& ogl, const video_format_desc& format_desc) \r
 244                 : ogl_(ogl)\r
 245                 , renderer_(ogl, format_desc)\r
 246                 , transform_stack_(1)   \r
 247         {\r
 248         }\r
 249 \r
 250         void begin_layer(blend_mode::type blend_mode)\r
 251         {\r
 252                 layers_.push_back(std::make_pair(blend_mode, std::vector<item>()));\r
 253         }\r
 254                 \r
 255         void begin(basic_frame& frame)\r
 256         {\r
 257                 transform_stack_.push_back(transform_stack_.back()*frame.get_frame_transform());\r
 258         }\r
 259                 \r
 260         void visit(write_frame& frame)\r
 261         {                       \r
 262                 item item;\r
 263                 item.pix_desc   = frame.get_pixel_format_desc();\r
 264                 item.textures   = frame.get_textures();\r
 265                 item.transform  = transform_stack_.back();\r
 266 \r
 267                 layers_.back().second.push_back(item);\r
 268         }\r
 269 \r
 270         void end()\r
 271         {\r
 272                 transform_stack_.pop_back();\r
 273         }\r
 274 \r
 275         void end_layer()\r
 276         {               \r
 277         }\r
 278         \r
 279         boost::unique_future<safe_ptr<host_buffer>> render()\r
 280         {\r
 281                 return renderer_(std::move(layers_));\r
 282         }\r
 283 \r
 284         safe_ptr<write_frame> create_frame(const void* tag, const pixel_format_desc& desc)\r
 285         {\r
 286                 return make_safe<write_frame>(ogl_, tag, desc);\r
 287         }\r
 288 };\r
 289 \r
 290 image_mixer::image_mixer(ogl_device& ogl, const video_format_desc& format_desc) : impl_(new implementation(ogl, format_desc)){}\r
 291 void image_mixer::begin(basic_frame& frame){impl_->begin(frame);}\r
 292 void image_mixer::visit(write_frame& frame){impl_->visit(frame);}\r
 293 void image_mixer::end(){impl_->end();}\r
 294 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}\r
 295 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 296 void image_mixer::begin_layer(blend_mode::type blend_mode){impl_->begin_layer(blend_mode);}\r
 297 void image_mixer::end_layer(){impl_->end_layer();}\r
 298 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 299 {\r
 300         impl_ = std::move(other.impl_);\r
 301         return *this;\r
 302 }\r
 303 \r
 304 }}