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