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 <common/concurrency/executor.h>\r
  31 #include <common/exception/exceptions.h>\r
  32 #include <common/gl/gl_check.h>\r
  33 \r
  34 #include <core/producer/frame/image_transform.h>\r
  35 #include <core/producer/frame/pixel_format.h>\r
  36 #include <core/video_format.h>\r
  37 \r
  38 #include <boost/foreach.hpp>\r
  39 \r
  40 #include <array>\r
  41 #include <unordered_map>\r
  42 \r
  43 namespace caspar { namespace core {\r
  44                 \r
  45 struct image_mixer::implementation : boost::noncopyable\r
  46 {       \r
  47         static const size_t LOCAL_KEY_INDEX = 3;\r
  48         static const size_t LAYER_KEY_INDEX = 4;\r
  49 \r
  50         struct render_item\r
  51         {\r
  52                 core::pixel_format_desc desc;\r
  53                 std::vector<safe_ptr<device_buffer>> textures;\r
  54                 core::image_transform transform;\r
  55         };\r
  56 \r
  57         const core::video_format_desc format_desc_;\r
  58         \r
  59         std::stack<core::image_transform>               transform_stack_;\r
  60         std::vector<std::vector<render_item>>   transferring_queue_;\r
  61         std::vector<std::vector<render_item>>   render_queue_;\r
  62         \r
  63         image_kernel kernel_;\r
  64                         \r
  65         safe_ptr<device_buffer> draw_buffer_;\r
  66         safe_ptr<device_buffer> write_buffer_;\r
  67 \r
  68         safe_ptr<device_buffer> local_key_buffer_;\r
  69         safe_ptr<device_buffer> layer_key_buffer_;\r
  70 \r
  71         bool local_key_;\r
  72         bool layer_key_;\r
  73 \r
  74 public:\r
  75         implementation(const core::video_format_desc& format_desc) \r
  76                 : format_desc_(format_desc)\r
  77                 , draw_buffer_(ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4))\r
  78                 , write_buffer_ (ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4))\r
  79                 , local_key_buffer_(ogl_device::create_device_buffer(format_desc.width, format_desc.height, 1))\r
  80                 , layer_key_buffer_(ogl_device::create_device_buffer(format_desc.width, format_desc.height, 1))\r
  81                 , local_key_(false)\r
  82                 , layer_key_(false)\r
  83         {\r
  84                 transform_stack_.push(core::image_transform());\r
  85         }\r
  86         \r
  87         void begin(const core::basic_frame& frame)\r
  88         {\r
  89                 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());\r
  90         }\r
  91                 \r
  92         void visit(core::write_frame& frame)\r
  93         {                                               \r
  94                 auto desc               = frame.get_pixel_format_desc();\r
  95                 auto buffers    = frame.get_plane_buffers();\r
  96                 auto transform  = transform_stack_.top()*frame.get_image_transform();\r
  97 \r
  98                 ogl_device::begin_invoke([=]\r
  99                 {\r
 100                         render_item item;\r
 101 \r
 102                         item.desc = desc;\r
 103                         item.transform = transform;\r
 104                         \r
 105                         // Start transfer from host to device.\r
 106 \r
 107                         for(size_t n = 0; n < buffers.size(); ++n)\r
 108                         {\r
 109                                 auto texture = ogl_device::create_device_buffer(desc.planes[n].width, desc.planes[n].height, desc.planes[n].channels);\r
 110                                 texture->read(*buffers[n]);\r
 111                                 item.textures.push_back(texture);\r
 112                         }       \r
 113 \r
 114                         transferring_queue_.back().push_back(item);\r
 115                 });\r
 116         }\r
 117 \r
 118         void end()\r
 119         {\r
 120                 transform_stack_.pop();\r
 121         }\r
 122 \r
 123         void begin_layer()\r
 124         {\r
 125                 ogl_device::begin_invoke([=]\r
 126                 {\r
 127                         transferring_queue_.push_back(std::vector<render_item>());\r
 128                 });\r
 129         }\r
 130 \r
 131         void end_layer()\r
 132         {\r
 133         }\r
 134 \r
 135         boost::unique_future<safe_ptr<const host_buffer>> render()\r
 136         {\r
 137                 auto result = ogl_device::create_host_buffer(format_desc_.size, host_buffer::read_only);\r
 138                                         \r
 139                 ogl_device::begin_invoke([=]\r
 140                 {\r
 141                         local_key_ = false;\r
 142                         layer_key_ = false;\r
 143 \r
 144                         // Clear buffers.\r
 145                         local_key_buffer_->clear();\r
 146                         layer_key_buffer_->clear();\r
 147                         draw_buffer_->clear();\r
 148 \r
 149                         // Draw items in device.\r
 150 \r
 151                         BOOST_FOREACH(auto layer, render_queue_)\r
 152                         {\r
 153                                 draw_buffer_->attach(); \r
 154 \r
 155                                 BOOST_FOREACH(auto item, layer)                 \r
 156                                         draw(item);     \r
 157                                                                 \r
 158                                 layer_key_ = local_key_; // If there was only key in last layer then use it as key for the entire next layer.\r
 159                                 local_key_ = false;\r
 160 \r
 161                                 std::swap(local_key_buffer_, layer_key_buffer_);\r
 162                         }\r
 163 \r
 164                         // Move waiting items to queue.\r
 165 \r
 166                         render_queue_ = std::move(transferring_queue_);\r
 167 \r
 168                         // Start transfer from device to host.\r
 169 \r
 170                         draw_buffer_->write(*result);\r
 171 \r
 172                         std::swap(draw_buffer_, write_buffer_);\r
 173                 });\r
 174                 \r
 175                 return ogl_device::begin_invoke([=]() -> safe_ptr<const host_buffer>\r
 176                 {\r
 177                         result->map(); // Might block.\r
 178                         return result;\r
 179                 });\r
 180         }\r
 181         \r
 182         void draw(const render_item& item)\r
 183         {               \r
 184                 // Bind textures\r
 185 \r
 186                 for(size_t n = 0; n < item.textures.size(); ++n)\r
 187                         item.textures[n]->bind(n);              \r
 188 \r
 189                 // Setup key and kernel\r
 190 \r
 191                 bool local_key = false;\r
 192                 bool layer_key = false;\r
 193                 \r
 194                 if(item.transform.get_is_key()) // This is a key frame, render it to the local_key buffer for later use.\r
 195                 {\r
 196                         if(!local_key_) // Initialize local-key if it is not active.\r
 197                         {\r
 198                                 local_key_buffer_->clear();\r
 199                                 local_key_buffer_->attach();\r
 200                                 local_key_ = true;\r
 201                         }\r
 202                 }               \r
 203                 else // This is a normal frame. Use key buffers if they are active.\r
 204                 {               \r
 205                         local_key = local_key_;\r
 206                         layer_key = layer_key_;\r
 207 \r
 208                         if(local_key_) // Use local key if we have it.\r
 209                         {\r
 210                                 local_key_buffer_->bind(LOCAL_KEY_INDEX);\r
 211                                 draw_buffer_->attach(); \r
 212                                 local_key_ = false; // Use it only one time.\r
 213                         }               \r
 214 \r
 215                         if(layer_key_) // Use layer key if we have it.\r
 216                                 layer_key_buffer_->bind(LAYER_KEY_INDEX);\r
 217                 }       \r
 218 \r
 219                 // Draw\r
 220 \r
 221                 kernel_.draw(format_desc_.width, format_desc_.height, item.desc, item.transform, local_key, layer_key); \r
 222         }\r
 223                         \r
 224         std::vector<safe_ptr<host_buffer>> create_buffers(const core::pixel_format_desc& format)\r
 225         {\r
 226                 std::vector<safe_ptr<host_buffer>> buffers;\r
 227                 std::transform(format.planes.begin(), format.planes.end(), std::back_inserter(buffers), [&](const core::pixel_format_desc::plane& plane)\r
 228                 {\r
 229                         return ogl_device::create_host_buffer(plane.size, host_buffer::write_only);\r
 230                 });\r
 231                 return buffers;\r
 232         }\r
 233 };\r
 234 \r
 235 image_mixer::image_mixer(const core::video_format_desc& format_desc) : impl_(new implementation(format_desc)){}\r
 236 void image_mixer::begin(const 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<const host_buffer>> image_mixer::render(){return impl_->render();}\r
 240 std::vector<safe_ptr<host_buffer>> image_mixer::create_buffers(const core::pixel_format_desc& format){return impl_->create_buffers(format);}\r
 241 void image_mixer::begin_layer(){impl_->begin_layer();}\r
 242 void image_mixer::end_layer(){impl_->end_layer();}\r
 243 \r
 244 }}