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 <boost/foreach.hpp>\r
  41 \r
  42 #include <array>\r
  43 #include <unordered_map>\r
  44 \r
  45 namespace caspar { namespace core {\r
  46                 \r
  47 struct render_item\r
  48 {\r
  49         pixel_format_desc                                        desc;\r
  50         std::vector<safe_ptr<device_buffer>> textures;\r
  51         core::image_transform                            transform;\r
  52         int                                                                      tag;\r
  53 };\r
  54 \r
  55 struct image_mixer::implementation : boost::noncopyable\r
  56 {       \r
  57         static const size_t LOCAL_KEY_INDEX = 3;\r
  58         static const size_t LAYER_KEY_INDEX = 4;\r
  59         static const size_t BASE_INDEX = 5;\r
  60         \r
  61         video_channel_context&                                  channel_;\r
  62         \r
  63         std::stack<core::image_transform>               transform_stack_;\r
  64 \r
  65         std::queue<std::queue<std::deque<render_item>>> render_queue_; // layer/stream/items\r
  66         \r
  67         image_kernel                                                    kernel_;\r
  68                 \r
  69         std::shared_ptr<device_buffer>                  draw_buffer_[2];\r
  70         std::shared_ptr<device_buffer>                  write_buffer_;\r
  71 \r
  72         std::shared_ptr<device_buffer>                  stream_key_buffer_[2];\r
  73         std::shared_ptr<device_buffer>                  layer_key_buffer_;\r
  74 \r
  75         bool                                                                    local_key_;\r
  76         bool                                                                    layer_key_;\r
  77         \r
  78 public:\r
  79         implementation(video_channel_context& video_channel) \r
  80                 : channel_(video_channel)\r
  81                 , write_buffer_ (video_channel.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 4))\r
  82                 , layer_key_buffer_(video_channel.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 1))\r
  83                 , local_key_(false)\r
  84                 , layer_key_(false)\r
  85         {\r
  86                 draw_buffer_[0] = channel_.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 4);\r
  87                 draw_buffer_[1] = channel_.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 4);\r
  88                 stream_key_buffer_[0] = video_channel.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 1);\r
  89                 stream_key_buffer_[1] = video_channel.ogl().create_device_buffer(video_channel.get_format_desc().width, channel_.get_format_desc().height, 1);\r
  90 \r
  91                 transform_stack_.push(core::image_transform());\r
  92 \r
  93                 channel_.ogl().invoke([=]\r
  94                 {\r
  95                         if(!GLEE_VERSION_3_0)\r
  96                                 CASPAR_LOG(warning) << "Missing OpenGL 3.0 support.";//BOOST_THROW_EXCEPTION(not_supported() << msg_info("Missing OpenGL 3.0 support."));\r
  97                 });\r
  98         }\r
  99 \r
 100         void begin(core::basic_frame& frame)\r
 101         {\r
 102                 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());\r
 103         }\r
 104                 \r
 105         void visit(core::write_frame& frame)\r
 106         {                       \r
 107                 render_item item = {frame.get_pixel_format_desc(), frame.get_textures(), transform_stack_.top()*frame.get_image_transform(), frame.tag()};      \r
 108 \r
 109                 auto& layer = render_queue_.back();\r
 110 \r
 111                 if(layer.empty() || (!layer.back().empty() && layer.back().back().tag != frame.tag()))\r
 112                         layer.push(std::deque<render_item>());\r
 113                 \r
 114                 layer.back().push_back(item);\r
 115         }\r
 116 \r
 117         void end()\r
 118         {\r
 119                 transform_stack_.pop();\r
 120         }\r
 121 \r
 122         void begin_layer()\r
 123         {\r
 124                 render_queue_.push(std::queue<std::deque<render_item>>());\r
 125         }\r
 126 \r
 127         void end_layer()\r
 128         {\r
 129         }\r
 130 \r
 131         void reinitialize_buffers()\r
 132         {\r
 133                 draw_buffer_[0]                 = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
 134                 draw_buffer_[1]                 = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
 135                 write_buffer_                   = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
 136                 stream_key_buffer_[0]   = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
 137                 stream_key_buffer_[1]   = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
 138                 layer_key_buffer_               = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
 139                 channel_.ogl().gc();\r
 140         }\r
 141 \r
 142         safe_ptr<host_buffer> render()\r
 143         {               \r
 144                 auto render_queue = std::move(render_queue_);\r
 145 \r
 146                 return channel_.ogl().invoke([=]() mutable -> safe_ptr<host_buffer>\r
 147                 {\r
 148                         if(draw_buffer_[0]->width() != channel_.get_format_desc().width || draw_buffer_[0]->height() != channel_.get_format_desc().height)\r
 149                                 reinitialize_buffers();\r
 150                         \r
 151                         return do_render(std::move(render_queue));\r
 152                 });\r
 153         }\r
 154         \r
 155         safe_ptr<host_buffer> do_render(std::queue<std::queue<std::deque<render_item>>>&& render_queue)\r
 156         {\r
 157                 auto read_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 158 \r
 159                 layer_key_buffer_->clear();\r
 160                 draw_buffer_[0]->clear();\r
 161                 draw_buffer_[1]->clear();\r
 162                 stream_key_buffer_[0]->clear();\r
 163                 stream_key_buffer_[1]->clear();\r
 164 \r
 165                 bool local_key = false;\r
 166                 bool layer_key = false;\r
 167 \r
 168                 while(!render_queue.empty())\r
 169                 {                       \r
 170                         stream_key_buffer_[0]->clear();\r
 171 \r
 172                         auto layer = std::move(render_queue.front());\r
 173                         render_queue.pop();\r
 174 \r
 175                         while(!layer.empty())\r
 176                         {\r
 177                                 auto stream = std::move(layer.front());\r
 178                                 layer.pop();\r
 179                                                                 \r
 180                                 render(stream, local_key, layer_key);\r
 181                                 \r
 182                                 local_key = stream.front().transform.get_is_key();\r
 183                                 if(!local_key)\r
 184                                         stream_key_buffer_[0]->clear();\r
 185 \r
 186                                 channel_.ogl().yield();\r
 187                         }\r
 188 \r
 189                         layer_key = local_key;\r
 190                         local_key = false;\r
 191                         std::swap(stream_key_buffer_[0], layer_key_buffer_);\r
 192                 }\r
 193 \r
 194                 std::swap(draw_buffer_[0], write_buffer_);\r
 195 \r
 196                 // Start transfer from device to host.                          \r
 197                 write_buffer_->write(*read_buffer);\r
 198 \r
 199                 return read_buffer;\r
 200         }\r
 201 \r
 202         void render(std::deque<render_item>& stream, bool local_key, bool layer_key)\r
 203         {\r
 204                 while(stream.size() > 2)\r
 205                         stream.pop_front();\r
 206                 \r
 207                 BOOST_FOREACH(auto item2, stream)\r
 208                 {\r
 209                         for(size_t n = 0; n < item2.textures.size(); ++n)\r
 210                                 item2.textures[n]->bind(n);     \r
 211                 }\r
 212 \r
 213                 if(stream.front().transform.get_is_key())\r
 214                 {\r
 215                         stream_key_buffer_[0]->bind(BASE_INDEX);                        \r
 216                         stream_key_buffer_[1]->attach();\r
 217                         \r
 218                         BOOST_FOREACH(auto item2, stream)\r
 219                                 kernel_.draw(channel_.get_format_desc().width, channel_.get_format_desc().height, item2.desc, item2.transform, false, false);\r
 220                         \r
 221                         std::swap(stream_key_buffer_[0], stream_key_buffer_[1]);\r
 222 \r
 223                         stream_key_buffer_[1]->bind();\r
 224                         glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, channel_.get_format_desc().width, channel_.get_format_desc().height); \r
 225                 }\r
 226                 else\r
 227                 {\r
 228                         stream_key_buffer_[0]->bind(LOCAL_KEY_INDEX);   \r
 229                         layer_key_buffer_->bind(LAYER_KEY_INDEX);\r
 230                         \r
 231                         draw_buffer_[0]->bind(BASE_INDEX);                      \r
 232                         draw_buffer_[1]->attach();      \r
 233                         \r
 234                         BOOST_FOREACH(auto item2, stream)\r
 235                                 kernel_.draw(channel_.get_format_desc().width, channel_.get_format_desc().height, item2.desc, item2.transform, local_key, layer_key);   \r
 236                         \r
 237                         std::swap(draw_buffer_[0], draw_buffer_[1]);\r
 238                         \r
 239                         draw_buffer_[1]->bind();\r
 240                         glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, channel_.get_format_desc().width, channel_.get_format_desc().height);\r
 241                 }\r
 242         }\r
 243                                 \r
 244         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 245         {\r
 246                 return make_safe<write_frame>(channel_.ogl(), reinterpret_cast<int>(tag), desc);\r
 247         }\r
 248 };\r
 249 \r
 250 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 251 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 252 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 253 void image_mixer::end(){impl_->end();}\r
 254 safe_ptr<host_buffer> image_mixer::render(){return impl_->render();}\r
 255 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 256 void image_mixer::begin_layer(){impl_->begin_layer();}\r
 257 void image_mixer::end_layer(){impl_->end_layer();}\r
 258 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 259 {\r
 260         impl_ = std::move(other.impl_);\r
 261         return *this;\r
 262 }\r
 263 \r
 264 }}