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         const void*                                                      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         typedef std::deque<render_item> stream;\r
  64         typedef std::deque<stream>              layer;\r
  65 \r
  66         video_channel_context&                                  channel_;\r
  67         \r
  68         std::stack<core::image_transform>               transform_stack_;\r
  69 \r
  70         std::queue<layer>                                               layers_; // layer/stream/items\r
  71         \r
  72         std::unique_ptr<image_kernel>                   kernel_;\r
  73                 \r
  74         std::shared_ptr<device_buffer>                  draw_buffer_[2];\r
  75         std::shared_ptr<device_buffer>                  write_buffer_;\r
  76 \r
  77         std::shared_ptr<device_buffer>                  stream_key_buffer_[2];\r
  78         std::shared_ptr<device_buffer>                  layer_key_buffer_;\r
  79         \r
  80 public:\r
  81         implementation(video_channel_context& video_channel) \r
  82                 : channel_(video_channel)\r
  83         {\r
  84                 initialize_buffers();\r
  85                 transform_stack_.push(core::image_transform());\r
  86 \r
  87                 channel_.ogl().invoke([=]\r
  88                 {\r
  89                         if(!GLEE_VERSION_3_0)\r
  90                                 CASPAR_LOG(warning) << "Missing OpenGL 3.0 support.";//BOOST_THROW_EXCEPTION(not_supported() << msg_info("Missing OpenGL 3.0 support."));\r
  91 \r
  92                         kernel_.reset(new image_kernel());\r
  93                 });\r
  94         }\r
  95 \r
  96         ~implementation()\r
  97         {\r
  98                 channel_.ogl().gc();\r
  99         }\r
 100 \r
 101         void initialize_buffers()\r
 102         {\r
 103                 write_buffer_                   = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
 104                 layer_key_buffer_               = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
 105                 draw_buffer_[0]                 = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
 106                 draw_buffer_[1]                 = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
 107                 stream_key_buffer_[0]   = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
 108                 stream_key_buffer_[1]   = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
 109         }\r
 110 \r
 111         void begin(core::basic_frame& frame)\r
 112         {\r
 113                 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());\r
 114         }\r
 115                 \r
 116         void visit(core::write_frame& frame)\r
 117         {                       \r
 118                 if(frame.get_textures().empty())\r
 119                         return;\r
 120 \r
 121                 render_item item = {frame.get_pixel_format_desc(), frame.get_textures(), transform_stack_.top()*frame.get_image_transform(), frame.tag()};      \r
 122 \r
 123                 auto& layer = layers_.back();\r
 124 \r
 125                 auto stream_it = std::find_if(layer.begin(), layer.end(), [&](stream& stream)\r
 126                 {\r
 127                         return stream.front().tag == item.tag;\r
 128                 });\r
 129 \r
 130                 if(stream_it == layer.end())\r
 131                         layer.push_back(stream(1, item));\r
 132                 else    \r
 133                 {\r
 134                         if(std::find(stream_it->begin(), stream_it->end(), item) == stream_it->end())\r
 135                                 stream_it->push_back(item);             \r
 136                 }\r
 137         }\r
 138 \r
 139         void end()\r
 140         {\r
 141                 transform_stack_.pop();\r
 142         }\r
 143 \r
 144         void begin_layer()\r
 145         {\r
 146                 layers_.push(layer());\r
 147         }\r
 148 \r
 149         void end_layer()\r
 150         {\r
 151         }\r
 152         \r
 153         boost::unique_future<safe_ptr<host_buffer>> render()\r
 154         {               \r
 155                 auto layers = std::move(layers_);\r
 156 \r
 157                 return channel_.ogl().begin_invoke([=]() mutable -> safe_ptr<host_buffer>\r
 158                 {                       \r
 159                         if(channel_.get_format_desc().width != write_buffer_->width() || channel_.get_format_desc().height != write_buffer_->height())\r
 160                                 initialize_buffers();\r
 161 \r
 162                         return do_render(std::move(layers));\r
 163                 });\r
 164         }\r
 165         \r
 166         safe_ptr<host_buffer> do_render(std::queue<layer>&& layers)\r
 167         {\r
 168                 auto read_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 169 \r
 170                 layer_key_buffer_->clear();\r
 171                 draw_buffer_[0]->clear();\r
 172                 draw_buffer_[1]->clear();\r
 173                 stream_key_buffer_[0]->clear();\r
 174                 stream_key_buffer_[1]->clear();\r
 175 \r
 176                 bool local_key = false;\r
 177                 bool layer_key = false;\r
 178 \r
 179                 while(!layers.empty())\r
 180                 {                       \r
 181                         stream_key_buffer_[0]->clear();\r
 182 \r
 183                         auto layer = std::move(layers.front());\r
 184                         layers.pop();\r
 185 \r
 186                         while(!layer.empty())\r
 187                         {\r
 188                                 auto stream = std::move(layer.front());\r
 189                                 layer.pop_front();\r
 190                                                                 \r
 191                                 render(stream, local_key, layer_key);\r
 192                                 \r
 193                                 local_key = stream.front().transform.get_is_key();\r
 194                                 if(!local_key)\r
 195                                         stream_key_buffer_[0]->clear();\r
 196 \r
 197                                 channel_.ogl().yield();\r
 198                         }\r
 199 \r
 200                         layer_key = local_key;\r
 201                         local_key = false;\r
 202                         std::swap(stream_key_buffer_[0], layer_key_buffer_);\r
 203                 }\r
 204 \r
 205                 std::swap(draw_buffer_[0], write_buffer_);\r
 206 \r
 207                 // Start transfer from device to host.                          \r
 208                 write_buffer_->write(*read_buffer);\r
 209 \r
 210                 return read_buffer;\r
 211         }\r
 212 \r
 213         void render(stream& stream, bool local_key, bool layer_key)\r
 214         {\r
 215                 CASPAR_ASSERT(!stream.empty());\r
 216                                 \r
 217                 if(stream.front().transform.get_is_key())\r
 218                 {\r
 219                         stream_key_buffer_[1]->attach();\r
 220                         \r
 221                         BOOST_FOREACH(auto item2, stream)\r
 222                         {       \r
 223                                 kernel_->draw(channel_.get_format_desc().width, channel_.get_format_desc().height, item2.desc, item2.transform, item2.textures, \r
 224                                                                 make_safe(stream_key_buffer_[0]), nullptr, nullptr);\r
 225                         }\r
 226 \r
 227                         std::swap(stream_key_buffer_[0], stream_key_buffer_[1]);\r
 228 \r
 229                         stream_key_buffer_[1]->bind();\r
 230                         glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, channel_.get_format_desc().width, channel_.get_format_desc().height); \r
 231                 }\r
 232                 else\r
 233                 {\r
 234                         draw_buffer_[1]->attach();      \r
 235                         \r
 236                         BOOST_FOREACH(auto item2, stream)\r
 237                         {       \r
 238                                 kernel_->draw(channel_.get_format_desc().width, channel_.get_format_desc().height, item2.desc, item2.transform, item2.textures, \r
 239                                                                 make_safe(draw_buffer_[0]), local_key ? stream_key_buffer_[0] : nullptr, layer_key ? layer_key_buffer_ : nullptr);      \r
 240                         }\r
 241 \r
 242                         std::swap(draw_buffer_[0], draw_buffer_[1]);\r
 243                         \r
 244                         draw_buffer_[1]->bind();\r
 245                         glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, channel_.get_format_desc().width, channel_.get_format_desc().height);\r
 246                 }\r
 247         }\r
 248                                 \r
 249         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 250         {\r
 251                 return make_safe<write_frame>(channel_.ogl(), tag, desc);\r
 252         }\r
 253 };\r
 254 \r
 255 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 256 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 257 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 258 void image_mixer::end(){impl_->end();}\r
 259 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}\r
 260 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 261 void image_mixer::begin_layer(){impl_->begin_layer();}\r
 262 void image_mixer::end_layer(){impl_->end_layer();}\r
 263 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 264 {\r
 265         impl_ = std::move(other.impl_);\r
 266         return *this;\r
 267 }\r
 268 \r
 269 }}