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 image_mixer::implementation : boost::noncopyable\r
  50 {               \r
  51         typedef std::deque<render_item>                                 layer;\r
  52 \r
  53         video_channel_context&                                                  channel_;\r
  54 \r
  55         std::vector<image_transform>                                    transform_stack_;\r
  56         std::vector<video_mode::type>                                   mode_stack_;\r
  57 \r
  58         std::queue<std::deque<render_item>>                             layers_; // layer/stream/items\r
  59         \r
  60         image_kernel                                                                    kernel_;\r
  61                 \r
  62         std::array<std::shared_ptr<device_buffer>,2>    draw_buffer_;\r
  63         std::shared_ptr<device_buffer>                                  write_buffer_;\r
  64 \r
  65         std::array<std::shared_ptr<device_buffer>,2>    stream_key_buffer_;\r
  66         std::shared_ptr<device_buffer>                                  layer_key_buffer_;\r
  67         \r
  68 public:\r
  69         implementation(video_channel_context& video_channel) \r
  70                 : channel_(video_channel)\r
  71                 , transform_stack_(1)\r
  72                 , mode_stack_(1, video_mode::progressive)\r
  73         {\r
  74                 initialize_buffers();\r
  75         }\r
  76 \r
  77         ~implementation()\r
  78         {\r
  79                 channel_.ogl().gc();\r
  80         }\r
  81 \r
  82         void initialize_buffers()\r
  83         {\r
  84                 write_buffer_                   = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
  85                 layer_key_buffer_               = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
  86                 draw_buffer_[0]                 = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
  87                 draw_buffer_[1]                 = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 4);\r
  88                 stream_key_buffer_[0]   = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
  89                 stream_key_buffer_[1]   = channel_.ogl().create_device_buffer(channel_.get_format_desc().width, channel_.get_format_desc().height, 1);\r
  90                 channel_.ogl().gc();\r
  91         }\r
  92 \r
  93         void begin(core::basic_frame& frame)\r
  94         {\r
  95                 transform_stack_.push_back(transform_stack_.back()*frame.get_image_transform());\r
  96                 mode_stack_.push_back(frame.get_mode() == video_mode::progressive ? mode_stack_.back() : frame.get_mode());\r
  97         }\r
  98                 \r
  99         void visit(core::write_frame& frame)\r
 100         {       \r
 101                 CASPAR_ASSERT(!layers_.empty());\r
 102 \r
 103                 // Check if frame has been discarded by interlacing\r
 104                 if(boost::range::find(mode_stack_, video_mode::upper) != mode_stack_.end() && boost::range::find(mode_stack_, video_mode::lower) != mode_stack_.end())\r
 105                         return;\r
 106                 \r
 107                 core::render_item item = {frame.get_pixel_format_desc(), frame.get_textures(), transform_stack_.back(), mode_stack_.back(), frame.tag()};       \r
 108 \r
 109                 auto& layer = layers_.back();\r
 110 \r
 111                 auto it = boost::range::find(layer, item);\r
 112                 if(it == layer.end())\r
 113                         layer.push_back(item);\r
 114         }\r
 115 \r
 116         void end()\r
 117         {\r
 118                 transform_stack_.pop_back();\r
 119                 mode_stack_.pop_back();\r
 120         }\r
 121 \r
 122         void begin_layer()\r
 123         {\r
 124                 layers_.push(layer());\r
 125         }\r
 126 \r
 127         void end_layer()\r
 128         {\r
 129         }\r
 130         \r
 131         boost::unique_future<safe_ptr<host_buffer>> render()\r
 132         {               \r
 133                 auto layers = std::move(layers_);\r
 134 \r
 135                 return channel_.ogl().begin_invoke([=]() mutable -> safe_ptr<host_buffer>\r
 136                 {                       \r
 137                         if(channel_.get_format_desc().width != write_buffer_->width() || channel_.get_format_desc().height != write_buffer_->height())\r
 138                                 initialize_buffers();\r
 139 \r
 140                         return do_render(std::move(layers));\r
 141                 });\r
 142         }\r
 143         \r
 144         safe_ptr<host_buffer> do_render(std::queue<layer>&& layers)\r
 145         {\r
 146                 auto read_buffer = channel_.ogl().create_host_buffer(channel_.get_format_desc().size, host_buffer::read_only);\r
 147 \r
 148                 layer_key_buffer_->clear();\r
 149                 draw_buffer_[0]->clear();\r
 150                 draw_buffer_[1]->clear();\r
 151                 stream_key_buffer_[0]->clear();\r
 152                 stream_key_buffer_[1]->clear();\r
 153 \r
 154                 bool local_key = false;\r
 155                 bool layer_key = false;\r
 156 \r
 157                 while(!layers.empty())\r
 158                 {                       \r
 159                         stream_key_buffer_[0]->clear();\r
 160 \r
 161                         auto layer = std::move(layers.front());\r
 162                         layers.pop();\r
 163                         \r
 164                         while(!layer.empty())\r
 165                         {\r
 166                                 auto item = std::move(layer.front());\r
 167                                 layer.pop_front();\r
 168                                                                                         \r
 169                                 if(item.transform.get_is_key())\r
 170                                 {\r
 171                                         render_item(stream_key_buffer_, std::move(item), nullptr, nullptr);\r
 172                                         local_key = true;\r
 173                                 }\r
 174                                 else\r
 175                                 {\r
 176                                         render_item(draw_buffer_, std::move(item), local_key ? stream_key_buffer_[0] : nullptr, layer_key ? layer_key_buffer_ : nullptr);       \r
 177                                         stream_key_buffer_[0]->clear();\r
 178                                         local_key = false;\r
 179                                 }\r
 180                                 channel_.ogl().yield(); // Return resources to pool as early as possible.\r
 181                         }\r
 182 \r
 183                         layer_key = local_key;\r
 184                         local_key = false;\r
 185                         std::swap(stream_key_buffer_[0], layer_key_buffer_);\r
 186                 }\r
 187 \r
 188                 std::swap(draw_buffer_[0], write_buffer_);\r
 189 \r
 190                 // device -> host.                      \r
 191                 read_buffer->read(*write_buffer_);\r
 192 \r
 193                 return read_buffer;\r
 194         }\r
 195         \r
 196         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
 197         {\r
 198                 if(!std::all_of(item.textures.begin(), item.textures.end(), std::mem_fn(&device_buffer::ready)))\r
 199                 {\r
 200                         CASPAR_LOG(warning) << L"[image_mixer] Performance warning. Host to device transfer not complete, GPU will be stalled";\r
 201                         channel_.ogl().yield(); // Try to give it some more time.\r
 202                 }               \r
 203 \r
 204                 targets[1]->attach();\r
 205                         \r
 206                 kernel_.draw(item, make_safe(targets[0]), local_key, layer_key);\r
 207                 \r
 208                 targets[0]->bind();\r
 209 \r
 210                 glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, targets[0]->width(), targets[0]->height());\r
 211                 \r
 212                 std::swap(targets[0], targets[1]);\r
 213         }\r
 214                                 \r
 215         safe_ptr<write_frame> create_frame(const void* tag, const core::pixel_format_desc& desc)\r
 216         {\r
 217                 return make_safe<write_frame>(channel_.ogl(), tag, desc);\r
 218         }\r
 219 };\r
 220 \r
 221 image_mixer::image_mixer(video_channel_context& video_channel) : impl_(new implementation(video_channel)){}\r
 222 void image_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 223 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 224 void image_mixer::end(){impl_->end();}\r
 225 boost::unique_future<safe_ptr<host_buffer>> image_mixer::render(){return impl_->render();}\r
 226 safe_ptr<write_frame> image_mixer::create_frame(const void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 227 void image_mixer::begin_layer(){impl_->begin_layer();}\r
 228 void image_mixer::end_layer(){impl_->end_layer();}\r
 229 image_mixer& image_mixer::operator=(image_mixer&& other)\r
 230 {\r
 231         impl_ = std::move(other.impl_);\r
 232         return *this;\r
 233 }\r
 234 \r
 235 }}