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::vector<video_mode::type>                   video_mode_stack_;\r
  61         std::stack<blend_mode::type>                    blend_mode_stack_;\r
  62 \r
  63         std::deque<std::deque<render_item>>             layers_; // layer/stream/items\r
  64         \r
  65         image_kernel                                                    kernel_;                \r
  66 \r
  67         std::shared_ptr<device_buffer>                  active_buffer_;\r
  68 public:\r
  69         implementation(video_channel_context& video_channel) \r
  70                 : channel_(video_channel)\r
  71                 , transform_stack_(1)\r
  72                 , video_mode_stack_(1, video_mode::progressive)\r
  73         {\r
  74         }\r
  75 \r
  76         ~implementation()\r
  77         {\r
  78                 channel_.ogl().gc();\r
  79         }\r
  80         \r
  81         void begin(core::basic_frame& frame)\r
  82         {\r
  83                 transform_stack_.push_back(transform_stack_.back()*frame.get_image_transform());\r
  84                 video_mode_stack_.push_back(frame.get_mode() == video_mode::progressive ? video_mode_stack_.back() : frame.get_mode());\r
  85         }\r
  86                 \r
  87         void visit(core::write_frame& frame)\r
  88         {       \r
  89                 CASPAR_ASSERT(!layers_.empty());\r
  90 \r
  91                 // Check if frame has been discarded by interlacing\r
  92                 if(boost::range::find(video_mode_stack_, video_mode::upper) != video_mode_stack_.end() && boost::range::find(video_mode_stack_, video_mode::lower) != video_mode_stack_.end())\r
  93                         return;\r
  94                 \r
  95                 core::render_item item;\r
  96                 item.pix_desc           = frame.get_pixel_format_desc();\r
  97                 item.textures           = frame.get_textures();\r
  98                 item.transform          = transform_stack_.back();\r
  99                 item.mode                       = video_mode_stack_.back();\r
 100                 item.tag                        = frame.tag();\r
 101                 item.blend_mode         = blend_mode_stack_.top();      \r
 102 \r
 103                 auto& layer = layers_.back();\r
 104                 if(boost::range::find(layer, item) == layer.end())\r
 105                         layer.push_back(item);\r
 106         }\r
 107 \r
 108         void end()\r
 109         {\r
 110                 transform_stack_.pop_back();\r
 111                 video_mode_stack_.pop_back();\r
 112         }\r
 113 \r
 114         void begin_layer(blend_mode::type blend_mode)\r
 115         {\r
 116                 blend_mode_stack_.push(blend_mode);\r
 117                 layers_.push_back(layer());\r
 118         }\r
 119 \r
 120         void end_layer()\r
 121         {\r
 122                 blend_mode_stack_.pop();\r
 123         }\r
 124         \r
 125         boost::unique_future<safe_ptr<host_buffer>> render()\r
 126         {               \r
 127                 auto layers = std::move(layers_);\r
 128                 return channel_.ogl().begin_invoke([=]() mutable\r
 129                 {\r
 130                         return render(std::move(layers));\r
 131                 });\r
 132         }\r
 133         \r
 134         safe_ptr<host_buffer> render(std::deque<layer>&& layers)\r
 135         {\r
 136                 std::shared_ptr<device_buffer> layer_key_buffer;\r
 137 \r
 138                 auto draw_buffer = create_device_buffer(4);\r
 139                                 \r
 140                 BOOST_FOREACH(auto& layer, layers)\r
 141                         draw(std::move(layer), draw_buffer, layer_key_buffer);\r
 142                 \r
 143                 auto host_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 144                 channel_.ogl().attach(*draw_buffer);\r
 145                 host_buffer->begin_read(draw_buffer->width(), draw_buffer->height(), format(draw_buffer->stride()));\r
 146                 \r
 147                 active_buffer_ = draw_buffer;\r
 148 \r
 149                 channel_.ogl().flush(); // NOTE: This is important, otherwise fences will deadlock.\r
 150                         \r
 151                 return host_buffer;\r
 152         }\r
 153 \r
 154         // TODO: We might have more overlaps for opacity transitions\r
 155         // TODO: What about blending modes, are they ok? Maybe only overlap detection is required for opacity?\r
 156         void draw(layer&& layer, const safe_ptr<device_buffer>& draw_buffer, std::shared_ptr<device_buffer>& layer_key_buffer)\r
 157         {                               \r
 158                 if(layer.empty())\r
 159                         return;\r
 160 \r
 161                 std::pair<int, std::shared_ptr<device_buffer>> local_key_buffer;\r
 162                                 \r
 163                 if(has_overlapping_items(layer, layer.front().blend_mode))\r
 164                 {\r
 165                         auto local_draw_buffer = create_device_buffer(4);       \r
 166                         auto local_blend_mode = layer.front().blend_mode;\r
 167 \r
 168                         int fields = 0;\r
 169                         BOOST_FOREACH(auto& item, layer)\r
 170                         {\r
 171                                 if(fields & item.mode)\r
 172                                         item.blend_mode = blend_mode::normal; // Disable blending, it will be used when merging back into render stack.\r
 173                                 else\r
 174                                 {\r
 175                                         item.blend_mode = blend_mode::replace; // Target field is empty, no blending, just copy\r
 176                                         fields |= item.mode;\r
 177                                 }\r
 178 \r
 179                                 draw_item(std::move(item), local_draw_buffer, local_key_buffer, layer_key_buffer);              \r
 180                         }\r
 181                         \r
 182                         render_item item;\r
 183                         item.pix_desc.pix_fmt = pixel_format::bgra;\r
 184                         item.pix_desc.planes.push_back(pixel_format_desc::plane(channel_.get_format_desc().width, channel_.get_format_desc().height, 4));\r
 185                         item.textures.push_back(local_draw_buffer);\r
 186                         item.blend_mode = local_blend_mode;\r
 187 \r
 188                         kernel_.draw(channel_.ogl(), std::move(item), draw_buffer, nullptr, nullptr);\r
 189                 }\r
 190                 else // fast path\r
 191                 {\r
 192                         BOOST_FOREACH(auto& item, layer)                \r
 193                                 draw_item(std::move(item), draw_buffer, local_key_buffer, layer_key_buffer);            \r
 194                 }                                       \r
 195 \r
 196                 CASPAR_ASSERT(local_key_buffer.first == 0 || local_key_buffer.first == core::video_mode::progressive);\r
 197 \r
 198                 std::swap(local_key_buffer.second, layer_key_buffer);\r
 199         }\r
 200 \r
 201         void draw_item(render_item&&                                                                    item, \r
 202                                    const safe_ptr<device_buffer>&                                       draw_buffer, \r
 203                                    std::pair<int, std::shared_ptr<device_buffer>>&      local_key_buffer, \r
 204                                    std::shared_ptr<device_buffer>&                                      layer_key_buffer)\r
 205         {                                                                                       \r
 206                 if(item.transform.get_is_key())\r
 207                 {\r
 208                         if(!local_key_buffer.second)\r
 209                         {\r
 210                                 local_key_buffer.first = 0;\r
 211                                 local_key_buffer.second = create_device_buffer(1);\r
 212                         }\r
 213                         \r
 214                         local_key_buffer.first |= item.mode; // Add field to flag.\r
 215                         kernel_.draw(channel_.ogl(), std::move(item), make_safe(local_key_buffer.second), nullptr, nullptr);\r
 216                 }\r
 217                 else\r
 218                 {\r
 219                         kernel_.draw(channel_.ogl(), std::move(item), draw_buffer, local_key_buffer.second, layer_key_buffer);\r
 220                         local_key_buffer.first ^= item.mode; // Remove field from flag.\r
 221                         \r
 222                         if(local_key_buffer.first == 0) // If all fields from key has been used, reset it\r
 223                         {\r
 224                                 local_key_buffer.first = 0;\r
 225                                 local_key_buffer.second.reset();\r
 226                         }\r
 227                 }\r
 228         }\r
 229 \r
 230         //// TODO: Optimize\r
 231         bool has_overlapping_items(const layer& layer, blend_mode::type blend_mode)\r
 232         {\r
 233                 if(layer.size() < 2)\r
 234                         return false;   \r
 235                 \r
 236                 if(blend_mode == blend_mode::normal)\r
 237                         return false;\r
 238                                 \r
 239                 return std::any_of(layer.begin(), layer.end(), [&](const render_item& item)\r
 240                 {\r
 241                         return item.tag != layer.front().tag;\r
 242                 });\r
 243 \r
 244                 //std::copy_if(layer.begin(), layer.end(), std::back_inserter(fill), [&](const render_item& item)\r
 245                 //{\r
 246                 //      return !item.transform.get_is_key();\r
 247                 //});\r
 248                 //      \r
 249                 //if(blend_mode == blend_mode::normal) // only overlap if opacity\r
 250                 //{\r
 251                 //      return std::any_of(fill.begin(), fill.end(), [&](const render_item& item)\r
 252                 //      {\r
 253                 //              return item.transform.get_opacity() < 1.0 - 0.001;\r
 254                 //      });\r
 255                 //}\r
 256 \r
 257                 //// simple solution, just check if we have differnt video streams / tags.\r
 258                 //return std::any_of(fill.begin(), fill.end(), [&](const render_item& item)\r
 259                 //{\r
 260                 //      return item.tag != fill.front().tag;\r
 261                 //});\r
 262         }                       \r
 263                 \r
 264         safe_ptr<device_buffer> create_device_buffer(size_t stride)\r
 265         {\r
 266                 auto buffer = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, stride);\r
 267                 channel_.ogl().clear(*buffer);\r
 268                 return buffer;\r
 269         }\r
 270 \r
 271         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 272         {\r
 273                 return make_safe<write_frame>(channel_.ogl(), tag, desc);\r
 274         }\r
 275 };\r
 276 \r
 277 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 278 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 279 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 280 void image_mixer::end(){impl_->end();}\r
 281 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}\r
 282 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 283 void image_mixer::begin_layer(blend_mode::type blend_mode){impl_->begin_layer(blend_mode);}\r
 284 void image_mixer::end_layer(){impl_->end_layer();}\r
 285 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 286 {\r
 287         impl_ = std::move(other.impl_);\r
 288         return *this;\r
 289 }\r
 290 \r
 291 }}