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 public:\r
  66         implementation(video_channel_context& video_channel) \r
  67                 : channel_(video_channel)\r
  68                 , transform_stack_(1)\r
  69                 , mode_stack_(1, video_mode::progressive)\r
  70         {\r
  71         }\r
  72 \r
  73         ~implementation()\r
  74         {\r
  75                 channel_.ogl().gc();\r
  76         }\r
  77         \r
  78         void begin(core::basic_frame& frame)\r
  79         {\r
  80                 transform_stack_.push_back(transform_stack_.back()*frame.get_image_transform());\r
  81                 mode_stack_.push_back(frame.get_mode() == video_mode::progressive ? mode_stack_.back() : frame.get_mode());\r
  82         }\r
  83                 \r
  84         void visit(core::write_frame& frame)\r
  85         {       \r
  86                 CASPAR_ASSERT(!layers_.empty());\r
  87 \r
  88                 // Check if frame has been discarded by interlacing\r
  89                 if(boost::range::find(mode_stack_, video_mode::upper) != mode_stack_.end() && boost::range::find(mode_stack_, video_mode::lower) != mode_stack_.end())\r
  90                         return;\r
  91                 \r
  92                 core::render_item item(frame.get_pixel_format_desc(), frame.get_textures(), transform_stack_.back(), mode_stack_.back(), frame.tag());  \r
  93 \r
  94                 auto& layer = layers_.back();\r
  95 \r
  96                 if(boost::range::find(layer, item) == layer.end())\r
  97                         layer.push_back(item);\r
  98         }\r
  99 \r
 100         void end()\r
 101         {\r
 102                 transform_stack_.pop_back();\r
 103                 mode_stack_.pop_back();\r
 104         }\r
 105 \r
 106         void begin_layer()\r
 107         {\r
 108                 layers_.push_back(layer());\r
 109         }\r
 110 \r
 111         void end_layer()\r
 112         {\r
 113         }\r
 114         \r
 115         boost::unique_future<safe_ptr<host_buffer>> render()\r
 116         {               \r
 117                 auto layers = std::move(layers_);\r
 118                 return channel_.ogl().begin_invoke([=]() mutable\r
 119                 {\r
 120                         return render(std::move(layers));\r
 121                 });\r
 122         }\r
 123         \r
 124         safe_ptr<host_buffer> render(std::deque<layer>&& layers)\r
 125         {\r
 126                 std::shared_ptr<device_buffer> layer_key_buffer;\r
 127 \r
 128                 auto draw_buffer = create_device_buffer(4);\r
 129                                 \r
 130                 BOOST_FOREACH(auto& layer, layers)\r
 131                         draw(std::move(layer), draw_buffer, layer_key_buffer);\r
 132                                 \r
 133                 auto host_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 134                 channel_.ogl().attach(*draw_buffer);\r
 135                 host_buffer->begin_read(draw_buffer->width(), draw_buffer->height(), format(draw_buffer->stride()));\r
 136                 \r
 137                 GL(glFlush());\r
 138                 \r
 139                 return host_buffer;\r
 140         }\r
 141 \r
 142         // TODO: We might have more overlaps for opacity transitions\r
 143         // TODO: What about blending modes, are they ok? Maybe only overlap detection is required for opacity?\r
 144         void draw(layer&& layer, const safe_ptr<device_buffer>& draw_buffer, std::shared_ptr<device_buffer>& layer_key_buffer)\r
 145         {                               \r
 146                 if(layer.empty())\r
 147                         return;\r
 148 \r
 149                 std::shared_ptr<device_buffer> local_key_buffer;\r
 150                                         \r
 151                 if(has_overlapping_items(layer, layer.front().transform.get_blend_mode()))\r
 152                 {\r
 153                         auto local_draw_buffer = create_device_buffer(4);       \r
 154                         \r
 155                         BOOST_FOREACH(auto& item, layer)                \r
 156                         {\r
 157                                 item.transform.set_blend_mode(image_transform::blend_mode::normal);\r
 158                                 draw_item(std::move(item), local_draw_buffer, local_key_buffer, layer_key_buffer);              \r
 159                         }\r
 160 \r
 161                         kernel_.draw(channel_.ogl(), create_render_item(local_draw_buffer, layer.front().transform.get_blend_mode()), draw_buffer, nullptr, nullptr);\r
 162                 }\r
 163                 else // fast path\r
 164                 {\r
 165                         BOOST_FOREACH(auto& item, layer)                \r
 166                                 draw_item(std::move(item), draw_buffer, local_key_buffer, layer_key_buffer);            \r
 167                 }                                       \r
 168 \r
 169                 std::swap(local_key_buffer, layer_key_buffer);\r
 170         }\r
 171 \r
 172         void draw_item(render_item&& item, const safe_ptr<device_buffer>& draw_buffer, std::shared_ptr<device_buffer>& local_key_buffer, std::shared_ptr<device_buffer>& layer_key_buffer)\r
 173         {                                                                                       \r
 174                 if(item.transform.get_is_key())\r
 175                 {\r
 176                         if(!local_key_buffer)\r
 177                                 local_key_buffer = create_device_buffer(1);\r
 178 \r
 179                         item.transform.set_opacity(1.0);\r
 180                         item.transform.set_blend_mode(image_transform::blend_mode::normal);\r
 181                         kernel_.draw(channel_.ogl(), std::move(item), make_safe(local_key_buffer), nullptr, nullptr);\r
 182                 }\r
 183                 else\r
 184                 {\r
 185                         kernel_.draw(channel_.ogl(), std::move(item), draw_buffer, local_key_buffer, layer_key_buffer);\r
 186                         local_key_buffer.reset();\r
 187                 }\r
 188         }\r
 189 \r
 190         // TODO: Optimize\r
 191         bool has_overlapping_items(const layer& layer, image_transform::blend_mode::type blend_mode)\r
 192         {\r
 193                 if(layer.empty())\r
 194                         return false;   \r
 195                 \r
 196                 implementation::layer fill;\r
 197 \r
 198                 std::copy_if(layer.begin(), layer.end(), std::back_inserter(fill), [&](const render_item& item)\r
 199                 {\r
 200                         return !item.transform.get_is_key();\r
 201                 });\r
 202                         \r
 203                 if(blend_mode == image_transform::blend_mode::normal) // Only overlap if opacity\r
 204                 {\r
 205                         return std::any_of(fill.begin(), fill.end(), [&](const render_item& item)\r
 206                         {\r
 207                                 return item.transform.get_opacity() < 1.0 - 0.001;\r
 208                         });\r
 209                 }\r
 210 \r
 211                 // Simple solution, just check if we have differnt video streams / tags.\r
 212                 return std::any_of(fill.begin(), fill.end(), [&](const render_item& item)\r
 213                 {\r
 214                         return item.tag != fill.front().tag;\r
 215                 });\r
 216         }                       \r
 217                         \r
 218         render_item create_render_item(const safe_ptr<device_buffer>& buffer, image_transform::blend_mode::type blend_mode)\r
 219         {\r
 220                 CASPAR_ASSERT(buffer->stride() == 4 && "Only used for bgra textures");\r
 221 \r
 222                 pixel_format_desc desc;\r
 223                 desc.pix_fmt = pixel_format::bgra;\r
 224                 desc.planes.push_back(pixel_format_desc::plane(channel_.get_format_desc().width, channel_.get_format_desc().height, 4));\r
 225 \r
 226                 std::vector<safe_ptr<device_buffer>> textures;\r
 227                 textures.push_back(buffer);\r
 228                                 \r
 229                 image_transform transform;\r
 230                 transform.set_blend_mode(blend_mode);\r
 231 \r
 232                 return render_item(desc, std::move(textures), transform, video_mode::progressive, nullptr);              \r
 233         }\r
 234 \r
 235         safe_ptr<device_buffer> create_device_buffer(size_t stride)\r
 236         {\r
 237                 auto buffer = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, stride);\r
 238                 channel_.ogl().clear(*buffer);\r
 239                 return buffer;\r
 240         }\r
 241 \r
 242         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 243         {\r
 244                 return make_safe<write_frame>(channel_.ogl(), tag, desc);\r
 245         }\r
 246 };\r
 247 \r
 248 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 249 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 250 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 251 void image_mixer::end(){impl_->end();}\r
 252 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}\r
 253 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 254 void image_mixer::begin_layer(){impl_->begin_layer();}\r
 255 void image_mixer::end_layer(){impl_->end_layer();}\r
 256 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 257 {\r
 258         impl_ = std::move(other.impl_);\r
 259         return *this;\r
 260 }\r
 261 \r
 262 }}