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/frame_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 using namespace boost::assign;\r
  52 \r
  53 namespace caspar { namespace core {\r
  54         \r
  55 typedef std::deque<render_item>                         layer;\r
  56 \r
  57 class image_renderer\r
  58 {\r
  59         video_channel_context&                                  channel_;       \r
  60         image_kernel                                                    kernel_;        \r
  61         std::shared_ptr<device_buffer>                  active_buffer_;\r
  62 public:\r
  63         image_renderer(video_channel_context& channel)\r
  64                 : channel_(channel)\r
  65         {\r
  66         }\r
  67         \r
  68         boost::unique_future<safe_ptr<host_buffer>> render(std::deque<layer>&& layers)\r
  69         {               \r
  70                 auto layers2 = std::move(layers);\r
  71                 return channel_.ogl().begin_invoke([=]() mutable\r
  72                 {\r
  73                         return do_render(std::move(layers2));\r
  74                 });\r
  75         }\r
  76         \r
  77 private:\r
  78         safe_ptr<host_buffer> do_render(std::deque<layer>&& layers)\r
  79         {\r
  80                 std::shared_ptr<device_buffer> layer_key_buffer;\r
  81 \r
  82                 auto draw_buffer = create_device_buffer(4);\r
  83                                 \r
  84                 BOOST_FOREACH(auto& layer, layers)\r
  85                         draw(std::move(layer), draw_buffer, layer_key_buffer);\r
  86                 \r
  87                 auto host_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
  88                 channel_.ogl().attach(*draw_buffer);\r
  89                 host_buffer->begin_read(draw_buffer->width(), draw_buffer->height(), format(draw_buffer->stride()));\r
  90                 \r
  91                 active_buffer_ = draw_buffer;\r
  92 \r
  93                 channel_.ogl().flush(); // NOTE: This is important, otherwise fences will deadlock.\r
  94                         \r
  95                 return host_buffer;\r
  96         }\r
  97 \r
  98         // TODO: We might have more overlaps for opacity transitions\r
  99         // TODO: What about blending modes, are they ok? Maybe only overlap detection is required for opacity?\r
 100         void draw(layer&& layer, const safe_ptr<device_buffer>& draw_buffer, std::shared_ptr<device_buffer>& layer_key_buffer)\r
 101         {                               \r
 102                 if(layer.empty())\r
 103                         return;\r
 104 \r
 105                 std::pair<int, std::shared_ptr<device_buffer>> local_key_buffer; // int is fields flag\r
 106                                 \r
 107                 if(layer.front().blend_mode != blend_mode::normal && has_overlapping_items(layer))\r
 108                 {\r
 109                         auto layer_draw_buffer = create_device_buffer(4); // int is fields flag\r
 110                         auto layer_blend_mode = layer.front().blend_mode;\r
 111 \r
 112                         BOOST_FOREACH(auto& item, layer)\r
 113                         {\r
 114                                 item.blend_mode = blend_mode::normal; // Disable blending and just merge.\r
 115                                 draw_item(std::move(item), *layer_draw_buffer, local_key_buffer, layer_key_buffer);             \r
 116                         }\r
 117                         \r
 118                         render_item item;\r
 119                         item.pix_desc.pix_fmt   = pixel_format::bgra;\r
 120                         item.pix_desc.planes    = list_of(pixel_format_desc::plane(channel_.get_format_desc().width, channel_.get_format_desc().height, 4));\r
 121                         item.textures                   = list_of(layer_draw_buffer);\r
 122                         item.transform                  = frame_transform();\r
 123                         item.blend_mode                 = layer_blend_mode;\r
 124 \r
 125                         kernel_.draw(channel_.ogl(), std::move(item), *draw_buffer, nullptr, nullptr);\r
 126                 }\r
 127                 else // fast path\r
 128                 {\r
 129                         BOOST_FOREACH(auto& item, layer)                \r
 130                                 draw_item(std::move(item), *draw_buffer, local_key_buffer, layer_key_buffer);           \r
 131                 }                                       \r
 132 \r
 133                 CASPAR_ASSERT(local_key_buffer.first == 0 || local_key_buffer.first == core::field_mode::progressive);\r
 134 \r
 135                 std::swap(local_key_buffer.second, layer_key_buffer);\r
 136         }\r
 137 \r
 138         void draw_item(render_item&&                                                                    item, \r
 139                                    device_buffer&                                                                       draw_buffer, \r
 140                                    std::pair<int, std::shared_ptr<device_buffer>>&      local_key_buffer, \r
 141                                    std::shared_ptr<device_buffer>&                                      layer_key_buffer)\r
 142         {                                                                                       \r
 143                 if(item.transform.is_key)\r
 144                 {\r
 145                         if(!local_key_buffer.second)\r
 146                         {\r
 147                                 local_key_buffer.first = 0;\r
 148                                 local_key_buffer.second = create_device_buffer(1);\r
 149                         }\r
 150                         \r
 151                         local_key_buffer.first |= item.transform.field_mode; // Add field to flag.\r
 152                         kernel_.draw(channel_.ogl(), std::move(item), *local_key_buffer.second, nullptr, nullptr);\r
 153                 }\r
 154                 else\r
 155                 {\r
 156                         kernel_.draw(channel_.ogl(), std::move(item), draw_buffer, local_key_buffer.second, layer_key_buffer);\r
 157                         local_key_buffer.first ^= item.transform.field_mode; // Remove field from flag.\r
 158                         \r
 159                         if(local_key_buffer.first == 0) // If all fields from key has been used, reset it\r
 160                         {\r
 161                                 local_key_buffer.first = 0;\r
 162                                 local_key_buffer.second.reset();\r
 163                         }\r
 164                 }\r
 165         }\r
 166 \r
 167         bool has_overlapping_items(const layer& layer)\r
 168         {               \r
 169                 auto upper_count = boost::range::count_if(layer, [&](const render_item& item)\r
 170                 {\r
 171                         return item.transform.field_mode | field_mode::upper;\r
 172                 });\r
 173 \r
 174                 auto lower_count = boost::range::count_if(layer, [&](const render_item& item)\r
 175                 {\r
 176                         return item.transform.field_mode | field_mode::lower;\r
 177                 });\r
 178 \r
 179                 return upper_count > 1 || lower_count > 1;\r
 180         }                       \r
 181                 \r
 182         safe_ptr<device_buffer> create_device_buffer(size_t stride)\r
 183         {\r
 184                 auto buffer = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, stride);\r
 185                 channel_.ogl().clear(*buffer);\r
 186                 return buffer;\r
 187         }\r
 188 };\r
 189 \r
 190                 \r
 191 struct image_mixer::implementation : boost::noncopyable\r
 192 {       \r
 193         ogl_device&                                                             ogl_;\r
 194         image_renderer                                                  renderer_;\r
 195         std::vector<frame_transform>                    transform_stack_;\r
 196         blend_mode::type                                                active_blend_mode_;\r
 197         std::deque<std::deque<render_item>>             layers_; // layer/stream/items\r
 198 public:\r
 199         implementation(video_channel_context& video_channel) \r
 200                 : ogl_(video_channel.ogl())\r
 201                 , renderer_(video_channel)\r
 202                 , transform_stack_(1)\r
 203                 , active_blend_mode_(blend_mode::normal)                \r
 204         {\r
 205         }\r
 206 \r
 207         void begin_layer(blend_mode::type blend_mode)\r
 208         {\r
 209                 active_blend_mode_ = blend_mode;\r
 210                 layers_ += layer();\r
 211         }\r
 212                 \r
 213         void begin(core::basic_frame& frame)\r
 214         {\r
 215                 transform_stack_.push_back(transform_stack_.back()*frame.get_frame_transform());\r
 216         }\r
 217                 \r
 218         void visit(core::write_frame& frame)\r
 219         {       \r
 220                 if(transform_stack_.back().field_mode == field_mode::empty)\r
 221                         return;\r
 222                 \r
 223                 core::render_item item;\r
 224                 item.pix_desc   = frame.get_pixel_format_desc();\r
 225                 item.textures   = frame.get_textures();\r
 226                 item.transform  = transform_stack_.back();\r
 227                 item.blend_mode = active_blend_mode_;   \r
 228 \r
 229                 layers_.back() += item;\r
 230         }\r
 231 \r
 232         void end()\r
 233         {\r
 234                 transform_stack_.pop_back();\r
 235         }\r
 236 \r
 237         void end_layer()\r
 238         {               \r
 239         }\r
 240         \r
 241         boost::unique_future<safe_ptr<host_buffer>> render()\r
 242         {\r
 243                 return renderer_.render(std::move(layers_));\r
 244         }\r
 245 \r
 246         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 247         {\r
 248                 return make_safe<write_frame>(ogl_, tag, desc);\r
 249         }\r
 250 };\r
 251 \r
 252 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 253 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 254 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 255 void image_mixer::end(){impl_->end();}\r
 256 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}\r
 257 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 258 void image_mixer::begin_layer(blend_mode::type blend_mode){impl_->begin_layer(blend_mode);}\r
 259 void image_mixer::end_layer(){impl_->end_layer();}\r
 260 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 261 {\r
 262         impl_ = std::move(other.impl_);\r
 263         return *this;\r
 264 }\r
 265 \r
 266 }}