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