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::stack<blend_mode::type>                    blend_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>                  active_buffer_;\r
  67 public:\r
  68         implementation(video_channel_context& video_channel) \r
  69                 : channel_(video_channel)\r
  70                 , transform_stack_(1)\r
  71         {\r
  72         }\r
  73 \r
  74         ~implementation()\r
  75         {\r
  76                 channel_.ogl().gc();\r
  77         }\r
  78         \r
  79         void begin(core::basic_frame& frame)\r
  80         {\r
  81                 transform_stack_.push_back(transform_stack_.back()*frame.get_image_transform());\r
  82         }\r
  83                 \r
  84         void visit(core::write_frame& frame)\r
  85         {       \r
  86                 if(transform_stack_.back().get_field_mode() == field_mode::empty)\r
  87                         return;\r
  88                 \r
  89                 core::render_item item;\r
  90                 item.pix_desc           = frame.get_pixel_format_desc();\r
  91                 item.textures           = frame.get_textures();\r
  92                 item.transform          = transform_stack_.back();\r
  93                 item.tag                        = frame.tag();\r
  94                 item.blend_mode         = blend_mode_stack_.top();      \r
  95 \r
  96                 auto& layer = layers_.back();\r
  97                 if(boost::range::find(layer, item) == layer.end())\r
  98                         layer.push_back(item);\r
  99         }\r
 100 \r
 101         void end()\r
 102         {\r
 103                 transform_stack_.pop_back();\r
 104         }\r
 105 \r
 106         void begin_layer(blend_mode::type blend_mode)\r
 107         {\r
 108                 blend_mode_stack_.push(blend_mode);\r
 109                 layers_.push_back(layer());\r
 110         }\r
 111 \r
 112         void end_layer()\r
 113         {\r
 114                 blend_mode_stack_.pop();\r
 115         }\r
 116         \r
 117         boost::unique_future<safe_ptr<host_buffer>> render()\r
 118         {               \r
 119                 auto layers = std::move(layers_);\r
 120                 return channel_.ogl().begin_invoke([=]() mutable\r
 121                 {\r
 122                         return render(std::move(layers));\r
 123                 });\r
 124         }\r
 125         \r
 126         safe_ptr<host_buffer> render(std::deque<layer>&& layers)\r
 127         {\r
 128                 std::shared_ptr<device_buffer> layer_key_buffer;\r
 129 \r
 130                 auto draw_buffer = create_device_buffer(4);\r
 131                                 \r
 132                 BOOST_FOREACH(auto& layer, layers)\r
 133                         draw(std::move(layer), draw_buffer, layer_key_buffer);\r
 134                 \r
 135                 auto host_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 136                 channel_.ogl().attach(*draw_buffer);\r
 137                 host_buffer->begin_read(draw_buffer->width(), draw_buffer->height(), format(draw_buffer->stride()));\r
 138                 \r
 139                 active_buffer_ = draw_buffer;\r
 140 \r
 141                 channel_.ogl().flush(); // NOTE: This is important, otherwise fences will deadlock.\r
 142                         \r
 143                 return host_buffer;\r
 144         }\r
 145 \r
 146         // TODO: We might have more overlaps for opacity transitions\r
 147         // TODO: What about blending modes, are they ok? Maybe only overlap detection is required for opacity?\r
 148         void draw(layer&& layer, const safe_ptr<device_buffer>& draw_buffer, std::shared_ptr<device_buffer>& layer_key_buffer)\r
 149         {                               \r
 150                 if(layer.empty())\r
 151                         return;\r
 152 \r
 153                 std::pair<int, std::shared_ptr<device_buffer>> local_key_buffer;\r
 154                                 \r
 155                 if(has_overlapping_items(layer, layer.front().blend_mode))\r
 156                 {\r
 157                         auto local_draw_buffer = create_device_buffer(4);       \r
 158                         auto local_blend_mode = layer.front().blend_mode;\r
 159 \r
 160                         int fields = 0;\r
 161                         BOOST_FOREACH(auto& item, layer)\r
 162                         {\r
 163                                 if(fields & item.transform.get_field_mode())\r
 164                                         item.blend_mode = blend_mode::normal; // Disable blending, it will be used when merging back into render stack.\r
 165                                 else\r
 166                                 {\r
 167                                         item.blend_mode = blend_mode::replace; // Target field is empty, no blending, just copy\r
 168                                         fields |= item.transform.get_field_mode();\r
 169                                 }\r
 170 \r
 171                                 draw_item(std::move(item), *local_draw_buffer, local_key_buffer, layer_key_buffer);             \r
 172                         }\r
 173                         \r
 174                         render_item item;\r
 175                         item.pix_desc.pix_fmt = pixel_format::bgra;\r
 176                         item.pix_desc.planes.push_back(pixel_format_desc::plane(channel_.get_format_desc().width, channel_.get_format_desc().height, 4));\r
 177                         item.textures.push_back(local_draw_buffer);\r
 178                         item.blend_mode = local_blend_mode;\r
 179 \r
 180                         kernel_.draw(channel_.ogl(), std::move(item), *draw_buffer, nullptr, nullptr);\r
 181                 }\r
 182                 else // fast path\r
 183                 {\r
 184                         BOOST_FOREACH(auto& item, layer)                \r
 185                                 draw_item(std::move(item), *draw_buffer, local_key_buffer, layer_key_buffer);           \r
 186                 }                                       \r
 187 \r
 188                 CASPAR_ASSERT(local_key_buffer.first == 0 || local_key_buffer.first == core::field_mode::progressive);\r
 189 \r
 190                 std::swap(local_key_buffer.second, layer_key_buffer);\r
 191         }\r
 192 \r
 193         void draw_item(render_item&&                                                                    item, \r
 194                                    device_buffer&                                                                       draw_buffer, \r
 195                                    std::pair<int, std::shared_ptr<device_buffer>>&      local_key_buffer, \r
 196                                    std::shared_ptr<device_buffer>&                                      layer_key_buffer)\r
 197         {                                                                                       \r
 198                 if(item.transform.get_is_key())\r
 199                 {\r
 200                         if(!local_key_buffer.second)\r
 201                         {\r
 202                                 local_key_buffer.first = 0;\r
 203                                 local_key_buffer.second = create_device_buffer(1);\r
 204                         }\r
 205                         \r
 206                         local_key_buffer.first |= item.transform.get_field_mode(); // Add field to flag.\r
 207                         kernel_.draw(channel_.ogl(), std::move(item), *local_key_buffer.second, nullptr, nullptr);\r
 208                 }\r
 209                 else\r
 210                 {\r
 211                         kernel_.draw(channel_.ogl(), std::move(item), draw_buffer, local_key_buffer.second, layer_key_buffer);\r
 212                         local_key_buffer.first ^= item.transform.get_field_mode(); // Remove field from flag.\r
 213                         \r
 214                         if(local_key_buffer.first == 0) // If all fields from key has been used, reset it\r
 215                         {\r
 216                                 local_key_buffer.first = 0;\r
 217                                 local_key_buffer.second.reset();\r
 218                         }\r
 219                 }\r
 220         }\r
 221 \r
 222         //// TODO: Optimize\r
 223         bool has_overlapping_items(const layer& layer, blend_mode::type blend_mode)\r
 224         {\r
 225                 if(layer.size() < 2)\r
 226                         return false;   \r
 227                 \r
 228                 if(blend_mode == blend_mode::normal)\r
 229                         return false;\r
 230                                 \r
 231                 return std::any_of(layer.begin(), layer.end(), [&](const render_item& item)\r
 232                 {\r
 233                         return item.tag != layer.front().tag;\r
 234                 });\r
 235 \r
 236                 //std::copy_if(layer.begin(), layer.end(), std::back_inserter(fill), [&](const render_item& item)\r
 237                 //{\r
 238                 //      return !item.transform.get_is_key();\r
 239                 //});\r
 240                 //      \r
 241                 //if(blend_mode == blend_mode::normal) // only overlap if opacity\r
 242                 //{\r
 243                 //      return std::any_of(fill.begin(), fill.end(), [&](const render_item& item)\r
 244                 //      {\r
 245                 //              return item.transform.get_opacity() < 1.0 - 0.001;\r
 246                 //      });\r
 247                 //}\r
 248 \r
 249                 //// simple solution, just check if we have differnt video streams / tags.\r
 250                 //return std::any_of(fill.begin(), fill.end(), [&](const render_item& item)\r
 251                 //{\r
 252                 //      return item.tag != fill.front().tag;\r
 253                 //});\r
 254         }                       \r
 255                 \r
 256         safe_ptr<device_buffer> create_device_buffer(size_t stride)\r
 257         {\r
 258                 auto buffer = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, stride);\r
 259                 channel_.ogl().clear(*buffer);\r
 260                 return buffer;\r
 261         }\r
 262 \r
 263         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 264         {\r
 265                 return make_safe<write_frame>(channel_.ogl(), tag, desc);\r
 266         }\r
 267 };\r
 268 \r
 269 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 270 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 271 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 272 void image_mixer::end(){impl_->end();}\r
 273 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}\r
 274 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 275 void image_mixer::begin_layer(blend_mode::type blend_mode){impl_->begin_layer(blend_mode);}\r
 276 void image_mixer::end_layer(){impl_->end_layer();}\r
 277 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 278 {\r
 279         impl_ = std::move(other.impl_);\r
 280         return *this;\r
 281 }\r
 282 \r
 283 }}