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