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>                   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                 , mode_stack_(1, video_mode::progressive)\r
  72         {\r
  73         }\r
  74 \r
  75         ~implementation()\r
  76         {\r
  77                 channel_.ogl().gc();\r
  78         }\r
  79         \r
  80         void begin(core::basic_frame& frame)\r
  81         {\r
  82                 transform_stack_.push_back(transform_stack_.back()*frame.get_image_transform());\r
  83                 mode_stack_.push_back(frame.get_mode() == video_mode::progressive ? mode_stack_.back() : frame.get_mode());\r
  84         }\r
  85                 \r
  86         void visit(core::write_frame& frame)\r
  87         {       \r
  88                 CASPAR_ASSERT(!layers_.empty());\r
  89 \r
  90                 // Check if frame has been discarded by interlacing\r
  91                 if(boost::range::find(mode_stack_, video_mode::upper) != mode_stack_.end() && boost::range::find(mode_stack_, video_mode::lower) != mode_stack_.end())\r
  92                         return;\r
  93                 \r
  94                 core::render_item item(frame.get_pixel_format_desc(), frame.get_textures(), transform_stack_.back(), mode_stack_.back(), frame.tag());  \r
  95 \r
  96                 auto& layer = layers_.back();\r
  97 \r
  98                 if(boost::range::find(layer, item) == layer.end())\r
  99                         layer.push_back(item);\r
 100         }\r
 101 \r
 102         void end()\r
 103         {\r
 104                 transform_stack_.pop_back();\r
 105                 mode_stack_.pop_back();\r
 106         }\r
 107 \r
 108         void begin_layer()\r
 109         {\r
 110                 layers_.push_back(layer());\r
 111         }\r
 112 \r
 113         void end_layer()\r
 114         {\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().transform.get_blend_mode()))\r
 156                 {\r
 157                         auto local_draw_buffer = create_device_buffer(4);       \r
 158                         \r
 159                         BOOST_FOREACH(auto& item, layer)                \r
 160                         {\r
 161                                 item.transform.set_blend_mode(image_transform::blend_mode::normal);\r
 162                                 draw_item(std::move(item), local_draw_buffer, local_key_buffer, layer_key_buffer);              \r
 163                         }\r
 164 \r
 165                         kernel_.draw(channel_.ogl(), create_render_item(local_draw_buffer, layer.front().transform.get_blend_mode()), draw_buffer, nullptr, nullptr);\r
 166                 }\r
 167                 else // fast path\r
 168                 {\r
 169                         BOOST_FOREACH(auto& item, layer)                \r
 170                                 draw_item(std::move(item), draw_buffer, local_key_buffer, layer_key_buffer);            \r
 171                 }                                       \r
 172 \r
 173                 CASPAR_ASSERT(local_key_buffer.first == 0 || local_key_buffer.first == core::video_mode::progressive);\r
 174 \r
 175                 std::swap(local_key_buffer.second, layer_key_buffer);\r
 176         }\r
 177 \r
 178         void draw_item(render_item&&                                                                    item, \r
 179                                    const safe_ptr<device_buffer>&                                       draw_buffer, \r
 180                                    std::pair<int, std::shared_ptr<device_buffer>>&      local_key_buffer, \r
 181                                    std::shared_ptr<device_buffer>&                                      layer_key_buffer)\r
 182         {                                                                                       \r
 183                 if(item.transform.get_is_key())\r
 184                 {\r
 185                         if(!local_key_buffer.second)\r
 186                         {\r
 187                                 local_key_buffer.first = 0;\r
 188                                 local_key_buffer.second = create_device_buffer(1);\r
 189                         }\r
 190 \r
 191                         item.transform.set_opacity(1.0);\r
 192                         item.transform.set_blend_mode(image_transform::blend_mode::normal);\r
 193 \r
 194                         local_key_buffer.first |= item.mode;\r
 195                         kernel_.draw(channel_.ogl(), std::move(item), make_safe(local_key_buffer.second), nullptr, nullptr);\r
 196                 }\r
 197                 else\r
 198                 {\r
 199                         kernel_.draw(channel_.ogl(), std::move(item), draw_buffer, local_key_buffer.second, layer_key_buffer);\r
 200                         local_key_buffer.first ^= item.mode;\r
 201                         \r
 202                         if(local_key_buffer.first == 0)\r
 203                         {\r
 204                                 local_key_buffer.first = 0;\r
 205                                 local_key_buffer.second.reset();\r
 206                         }\r
 207                 }\r
 208         }\r
 209 \r
 210         // TODO: Optimize\r
 211         bool has_overlapping_items(const layer& layer, image_transform::blend_mode::type blend_mode)\r
 212         {\r
 213                 if(layer.empty())\r
 214                         return false;   \r
 215                 \r
 216                 implementation::layer fill;\r
 217 \r
 218                 std::copy_if(layer.begin(), layer.end(), std::back_inserter(fill), [&](const render_item& item)\r
 219                 {\r
 220                         return !item.transform.get_is_key();\r
 221                 });\r
 222                         \r
 223                 if(blend_mode == image_transform::blend_mode::normal) // Only overlap if opacity\r
 224                 {\r
 225                         return std::any_of(fill.begin(), fill.end(), [&](const render_item& item)\r
 226                         {\r
 227                                 return item.transform.get_opacity() < 1.0 - 0.001;\r
 228                         });\r
 229                 }\r
 230 \r
 231                 // Simple solution, just check if we have differnt video streams / tags.\r
 232                 return std::any_of(fill.begin(), fill.end(), [&](const render_item& item)\r
 233                 {\r
 234                         return item.tag != fill.front().tag;\r
 235                 });\r
 236         }                       \r
 237                         \r
 238         render_item create_render_item(const safe_ptr<device_buffer>& buffer, image_transform::blend_mode::type blend_mode)\r
 239         {\r
 240                 CASPAR_ASSERT(buffer->stride() == 4 && "Only used for bgra textures");\r
 241 \r
 242                 pixel_format_desc desc;\r
 243                 desc.pix_fmt = pixel_format::bgra;\r
 244                 desc.planes.push_back(pixel_format_desc::plane(channel_.get_format_desc().width, channel_.get_format_desc().height, 4));\r
 245 \r
 246                 std::vector<safe_ptr<device_buffer>> textures;\r
 247                 textures.push_back(buffer);\r
 248                                 \r
 249                 image_transform transform;\r
 250                 transform.set_blend_mode(blend_mode);\r
 251 \r
 252                 return render_item(desc, std::move(textures), transform, video_mode::progressive, nullptr);              \r
 253         }\r
 254 \r
 255         safe_ptr<device_buffer> create_device_buffer(size_t stride)\r
 256         {\r
 257                 auto buffer = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, stride);\r
 258                 channel_.ogl().clear(*buffer);\r
 259                 return buffer;\r
 260         }\r
 261 \r
 262         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 263         {\r
 264                 return make_safe<write_frame>(channel_.ogl(), tag, desc);\r
 265         }\r
 266 };\r
 267 \r
 268 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 269 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 270 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 271 void image_mixer::end(){impl_->end();}\r
 272 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}\r
 273 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 274 void image_mixer::begin_layer(){impl_->begin_layer();}\r
 275 void image_mixer::end_layer(){impl_->end_layer();}\r
 276 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 277 {\r
 278         impl_ = std::move(other.impl_);\r
 279         return *this;\r
 280 }\r
 281 \r
 282 }}