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 "../gpu/gpu_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 <Glee.h>\r
  41 #include <SFML/Window/Context.hpp>\r
  42 \r
  43 #include <array>\r
  44 #include <unordered_map>\r
  45 \r
  46 namespace caspar { namespace mixer {\r
  47                 \r
  48 struct image_mixer::implementation : boost::noncopyable\r
  49 {                       \r
  50         const core::video_format_desc format_desc_;\r
  51         \r
  52         std::stack<core::image_transform> transform_stack_;\r
  53 \r
  54         GLuint fbo_;\r
  55         std::array<std::shared_ptr<device_buffer>, 2> render_targets_;\r
  56         std::shared_ptr<device_buffer> key_target_;\r
  57         bool is_key_;\r
  58 \r
  59         std::shared_ptr<host_buffer> reading_;\r
  60 \r
  61         image_kernel kernel_;\r
  62 \r
  63         struct render_item\r
  64         {\r
  65                 core::pixel_format_desc desc;\r
  66                 std::vector<safe_ptr<device_buffer>> textures;\r
  67                 core::image_transform transform;\r
  68         };\r
  69         \r
  70         std::vector<render_item> waiting_queue_;\r
  71         std::vector<render_item> render_queue_;\r
  72 \r
  73 public:\r
  74         implementation(const core::video_format_desc& format_desc) \r
  75                 : format_desc_(format_desc)\r
  76                 , is_key_(false)\r
  77         {\r
  78                 ogl_device::invoke([]\r
  79                 {\r
  80                         if(!GLEE_VERSION_3_0)\r
  81                                 BOOST_THROW_EXCEPTION(not_supported() << msg_info("Missing OpenGL 3.0 support."));\r
  82                 });\r
  83                 \r
  84                 ogl_device::begin_invoke([=]\r
  85                 {\r
  86                         transform_stack_.push(core::image_transform());\r
  87                         transform_stack_.top().set_mode(core::video_mode::progressive);\r
  88 \r
  89                         GL(glEnable(GL_TEXTURE_2D));\r
  90                         GL(glDisable(GL_DEPTH_TEST));           \r
  91                         \r
  92                         key_target_ = ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4);\r
  93                         render_targets_[0] = ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4);\r
  94                         render_targets_[1] = ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4);\r
  95                         \r
  96                         GL(glGenFramebuffers(1, &fbo_));                \r
  97                         GL(glBindFramebuffer(GL_FRAMEBUFFER_EXT, fbo_));\r
  98                         GL(glReadBuffer(GL_COLOR_ATTACHMENT0_EXT));\r
  99 \r
 100                         reading_ = ogl_device::create_host_buffer(format_desc_.size, host_buffer::read_only);\r
 101                 });\r
 102         }\r
 103 \r
 104         ~implementation()\r
 105         {\r
 106                 glDeleteFramebuffersEXT(1, &fbo_);\r
 107         }\r
 108 \r
 109         void begin(const core::basic_frame& frame)\r
 110         {\r
 111                 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());\r
 112         }\r
 113                 \r
 114         void visit(core::write_frame& frame)\r
 115         {               \r
 116                 auto gpu_frame = dynamic_cast<gpu_write_frame*>(&frame);\r
 117                 if(!gpu_frame)\r
 118                         return;\r
 119                 \r
 120                 auto desc = gpu_frame->get_pixel_format_desc();\r
 121                 auto buffers = gpu_frame->get_plane_buffers();\r
 122                 auto transform = transform_stack_.top();\r
 123 \r
 124                 ogl_device::begin_invoke([=]\r
 125                 {\r
 126                         render_item item;\r
 127 \r
 128                         item.desc = desc;\r
 129                         item.transform = transform;\r
 130                         \r
 131                         for(size_t n = 0; n < buffers.size(); ++n)\r
 132                         {\r
 133                                 GL(glActiveTexture(GL_TEXTURE0+n));\r
 134                                 auto texture = ogl_device::create_device_buffer(desc.planes[n].width, desc.planes[n].height, desc.planes[n].channels);\r
 135                                 texture->read(*buffers[n]);\r
 136                                 item.textures.push_back(texture);\r
 137                         }       \r
 138 \r
 139                         waiting_queue_.push_back(item);\r
 140                 });\r
 141         }\r
 142 \r
 143         void end()\r
 144         {\r
 145                 transform_stack_.pop();\r
 146         }\r
 147 \r
 148         boost::unique_future<safe_ptr<const host_buffer>> render()\r
 149         {\r
 150                 auto result = ogl_device::begin_invoke([=]() -> safe_ptr<const host_buffer>\r
 151                 {\r
 152                         reading_->map(); // Might block.\r
 153                         return make_safe(reading_);\r
 154                 });\r
 155                         \r
 156                 ogl_device::begin_invoke([=]\r
 157                 {\r
 158                         is_key_ = false;\r
 159 \r
 160                         // Clear and bind frame-buffers.\r
 161 \r
 162                         key_target_->attach();\r
 163                         GL(glClear(GL_COLOR_BUFFER_BIT));       \r
 164 \r
 165                         render_targets_[0]->attach();\r
 166                         GL(glClear(GL_COLOR_BUFFER_BIT));\r
 167 \r
 168                         // Render items.\r
 169 \r
 170                         BOOST_FOREACH(auto item, render_queue_)\r
 171                                 render(item);                   \r
 172 \r
 173                         // Move waiting items to queue.\r
 174 \r
 175                         render_queue_ = std::move(waiting_queue_);\r
 176 \r
 177                         // Start read-back.\r
 178 \r
 179                         reading_ = ogl_device::create_host_buffer(format_desc_.size, host_buffer::read_only);\r
 180                         render_targets_[0]->attach();\r
 181                         render_targets_[0]->write(*reading_);\r
 182                         std::swap(render_targets_[0], render_targets_[1]);\r
 183                 });\r
 184 \r
 185                 return std::move(result);\r
 186         }\r
 187 \r
 188         void render(const render_item& item)\r
 189         {               \r
 190                 const auto desc          = item.desc;\r
 191                 auto       textures      = item.textures;\r
 192                 const auto transform = item.transform;\r
 193                                 \r
 194                 // Bind textures\r
 195 \r
 196                 for(size_t n = 0; n < textures.size(); ++n)\r
 197                 {\r
 198                         GL(glActiveTexture(GL_TEXTURE0+n));\r
 199                         textures[n]->bind();\r
 200                 }               \r
 201 \r
 202                 // Setup key and kernel\r
 203 \r
 204                 bool has_separate_key = false;\r
 205 \r
 206                 if(transform.get_is_key())\r
 207                 {\r
 208                         if(!is_key_)\r
 209                         {\r
 210                                 key_target_->attach();\r
 211                                 is_key_ = true;\r
 212                                 GL(glClear(GL_COLOR_BUFFER_BIT));               \r
 213                         }\r
 214                 }               \r
 215                 else\r
 216                 {                                               \r
 217                         if(is_key_)\r
 218                         {\r
 219                                 has_separate_key = true;\r
 220                                 is_key_ = false;\r
 221 \r
 222                                 render_targets_[0]->attach();                   \r
 223                                 GL(glActiveTexture(GL_TEXTURE0+3));\r
 224                                 key_target_->bind();\r
 225                         }       \r
 226                 }       \r
 227 \r
 228                 // Draw\r
 229 \r
 230                 kernel_.draw(format_desc_.width, format_desc_.height, desc, transform, has_separate_key);       \r
 231         }\r
 232                         \r
 233         std::vector<safe_ptr<host_buffer>> create_buffers(const core::pixel_format_desc& format)\r
 234         {\r
 235                 std::vector<safe_ptr<host_buffer>> buffers;\r
 236                 std::transform(format.planes.begin(), format.planes.end(), std::back_inserter(buffers), [&](const core::pixel_format_desc::plane& plane)\r
 237                 {\r
 238                         return ogl_device::create_host_buffer(plane.size, host_buffer::write_only);\r
 239                 });\r
 240                 return buffers;\r
 241         }\r
 242 };\r
 243 \r
 244 image_mixer::image_mixer(const core::video_format_desc& format_desc) : impl_(new implementation(format_desc)){}\r
 245 void image_mixer::begin(const core::basic_frame& frame){impl_->begin(frame);}\r
 246 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 247 void image_mixer::end(){impl_->end();}\r
 248 boost::unique_future<safe_ptr<const host_buffer>> image_mixer::render(){return impl_->render();}\r
 249 std::vector<safe_ptr<host_buffer>> image_mixer::create_buffers(const core::pixel_format_desc& format){return impl_->create_buffers(format);}\r
 250 \r
 251 }}