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                 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::queue<std::queue<render_item>>             render_queue_;\r
  61         \r
  62         image_kernel kernel_;\r
  63                         \r
  64         safe_ptr<host_buffer>   read_buffer_;\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                 , read_buffer_(ogl_device::create_host_buffer(format_desc_.size, host_buffer::read_only))\r
  78                 , draw_buffer_(ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4))\r
  79                 , write_buffer_ (ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4))\r
  80                 , local_key_buffer_(ogl_device::create_device_buffer(format_desc.width, format_desc.height, 1))\r
  81                 , layer_key_buffer_(ogl_device::create_device_buffer(format_desc.width, format_desc.height, 1))\r
  82                 , local_key_(false)\r
  83                 , layer_key_(false)\r
  84         {\r
  85                 transform_stack_.push(core::image_transform());\r
  86         }\r
  87         \r
  88         void begin(const core::basic_frame& frame)\r
  89         {\r
  90                 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());\r
  91         }\r
  92                 \r
  93         void visit(core::write_frame& frame)\r
  94         {                       \r
  95                 render_item item = {frame.get_pixel_format_desc(), frame.get_textures(), transform_stack_.top()*frame.get_image_transform()};   \r
  96                 render_queue_.back().push(item);\r
  97         }\r
  98 \r
  99         void end()\r
 100         {\r
 101                 transform_stack_.pop();\r
 102         }\r
 103 \r
 104         void begin_layer()\r
 105         {\r
 106                 render_queue_.push(std::queue<render_item>());\r
 107         }\r
 108 \r
 109         void end_layer()\r
 110         {\r
 111         }\r
 112 \r
 113         boost::unique_future<safe_ptr<const host_buffer>> render()\r
 114         {\r
 115                 auto read_buffer = read_buffer_;\r
 116 \r
 117                 auto result = ogl_device::begin_invoke([=]() -> safe_ptr<const host_buffer>\r
 118                 {\r
 119                         read_buffer->map(); // Might block.\r
 120                         return read_buffer;\r
 121                 });\r
 122 \r
 123                 auto render_queue = std::move(render_queue_);\r
 124 \r
 125                 ogl_device::begin_invoke([=]() mutable\r
 126                 {\r
 127                         local_key_ = false;\r
 128                         layer_key_ = false;\r
 129 \r
 130                         // Clear buffers.\r
 131                         local_key_buffer_->clear();\r
 132                         layer_key_buffer_->clear();\r
 133                         draw_buffer_->clear();\r
 134 \r
 135                         // Draw items in device.\r
 136 \r
 137                         while(!render_queue.empty())\r
 138                         {\r
 139                                 auto layer = render_queue.front();\r
 140                                 render_queue.pop();\r
 141                                 \r
 142                                 draw_buffer_->attach(); \r
 143 \r
 144                                 while(!layer.empty())\r
 145                                 {\r
 146                                         draw(layer.front());\r
 147                                         layer.pop();\r
 148                                         ogl_device::yield(); // Allow quick buffer allocation to execute.\r
 149                                 }\r
 150 \r
 151                                 layer_key_ = local_key_; // If there was only key in last layer then use it as key for the entire next layer.\r
 152                                 local_key_ = false;\r
 153 \r
 154                                 std::swap(local_key_buffer_, layer_key_buffer_);\r
 155                         }\r
 156 \r
 157                         // Start transfer from device to host.\r
 158 \r
 159                         read_buffer_ = ogl_device::create_host_buffer(format_desc_.size, host_buffer::read_only);\r
 160                         draw_buffer_->write(*read_buffer_);\r
 161 \r
 162                         std::swap(draw_buffer_, write_buffer_);\r
 163                 });\r
 164 \r
 165                 // While transferring do additional work which was queued during rendering.\r
 166                 \r
 167                 return std::move(result);\r
 168         }\r
 169         \r
 170         void draw(const render_item& item)\r
 171         {               \r
 172                 // Bind textures\r
 173 \r
 174                 for(size_t n = 0; n < item.textures.size(); ++n)\r
 175                         item.textures[n]->bind(n);              \r
 176 \r
 177                 // Setup key and kernel\r
 178 \r
 179                 bool local_key = false;\r
 180                 bool layer_key = false;\r
 181                 \r
 182                 if(item.transform.get_is_key()) // This is a key frame, render it to the local_key buffer for later use.\r
 183                 {\r
 184                         if(!local_key_) // Initialize local-key if it is not active.\r
 185                         {\r
 186                                 local_key_buffer_->clear();\r
 187                                 local_key_buffer_->attach();\r
 188                                 local_key_ = true;\r
 189                         }\r
 190                 }               \r
 191                 else // This is a normal frame. Use key buffers if they are active.\r
 192                 {               \r
 193                         local_key = local_key_;\r
 194                         layer_key = layer_key_;\r
 195 \r
 196                         if(local_key_) // Use local key if we have it.\r
 197                         {\r
 198                                 local_key_buffer_->bind(LOCAL_KEY_INDEX);\r
 199                                 draw_buffer_->attach(); \r
 200                                 local_key_ = false; // Use it only one time.\r
 201                         }               \r
 202 \r
 203                         if(layer_key_) // Use layer key if we have it.\r
 204                                 layer_key_buffer_->bind(LAYER_KEY_INDEX);\r
 205                 }       \r
 206 \r
 207                 // Draw\r
 208 \r
 209                 kernel_.draw(format_desc_.width, format_desc_.height, item.desc, item.transform, local_key, layer_key); \r
 210         }\r
 211                         \r
 212         safe_ptr<write_frame> create_frame(void* tag, const core::pixel_format_desc& desc)\r
 213         {\r
 214                 std::vector<safe_ptr<host_buffer>> buffers;\r
 215                 std::vector<safe_ptr<device_buffer>> textures;\r
 216                 ogl_device::invoke([&]\r
 217                 {\r
 218                         std::transform(desc.planes.begin(), desc.planes.end(), std::back_inserter(buffers), [&](const core::pixel_format_desc::plane& plane)\r
 219                         {\r
 220                                 return ogl_device::create_host_buffer(plane.size, host_buffer::write_only);\r
 221                         });\r
 222                         std::transform(desc.planes.begin(), desc.planes.end(), std::back_inserter(textures), [&](const core::pixel_format_desc::plane& plane)\r
 223                         {\r
 224                                 return ogl_device::create_device_buffer(plane.width, plane.height, plane.channels);\r
 225                         });\r
 226                 });\r
 227 \r
 228                 return make_safe<write_frame>(reinterpret_cast<int>(tag), desc, buffers, textures);\r
 229         }\r
 230 };\r
 231 \r
 232 image_mixer::image_mixer(const core::video_format_desc& format_desc) : impl_(new implementation(format_desc)){}\r
 233 void image_mixer::begin(const core::basic_frame& frame){impl_->begin(frame);}\r
 234 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 235 void image_mixer::end(){impl_->end();}\r
 236 boost::unique_future<safe_ptr<const host_buffer>> image_mixer::render(){return impl_->render();}\r
 237 safe_ptr<write_frame> image_mixer::create_frame(void* tag, const core::pixel_format_desc& desc){return impl_->create_frame(tag, desc);}\r
 238 void image_mixer::begin_layer(){impl_->begin_layer();}\r
 239 void image_mixer::end_layer(){impl_->end_layer();}\r
 240 \r
 241 }}