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