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