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<host_buffer>> buffers;\r
  67                 core::image_transform transform;\r
  68         };\r
  69 \r
  70         std::vector<render_item> render_queue_;\r
  71 \r
  72 public:\r
  73         implementation(const core::video_format_desc& format_desc) \r
  74                 : format_desc_(format_desc)\r
  75                 , is_key_(false)\r
  76         {\r
  77                 ogl_device::invoke([]\r
  78                 {\r
  79                         if(!GLEE_VERSION_3_0)\r
  80                                 BOOST_THROW_EXCEPTION(not_supported() << msg_info("Missing OpenGL 3.0 support."));\r
  81                 });\r
  82                 \r
  83                 ogl_device::begin_invoke([=]\r
  84                 {\r
  85                         transform_stack_.push(core::image_transform());\r
  86                         transform_stack_.top().set_mode(core::video_mode::progressive);\r
  87 \r
  88                         GL(glEnable(GL_TEXTURE_2D));\r
  89                         GL(glDisable(GL_DEPTH_TEST));           \r
  90                         \r
  91                         key_target_ = ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4);\r
  92                         render_targets_[0] = ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4);\r
  93                         render_targets_[1] = ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4);\r
  94                         \r
  95                         GL(glGenFramebuffers(1, &fbo_));                \r
  96                         GL(glBindFramebuffer(GL_FRAMEBUFFER_EXT, fbo_));\r
  97                         GL(glReadBuffer(GL_COLOR_ATTACHMENT0_EXT));\r
  98 \r
  99                         reading_ = ogl_device::create_host_buffer(format_desc_.size, host_buffer::read_only);\r
 100                 });\r
 101         }\r
 102 \r
 103         ~implementation()\r
 104         {\r
 105                 glDeleteFramebuffersEXT(1, &fbo_);\r
 106         }\r
 107 \r
 108         void begin(const core::basic_frame& frame)\r
 109         {\r
 110                 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());\r
 111         }\r
 112                 \r
 113         void visit(core::write_frame& frame)\r
 114         {               \r
 115                 auto gpu_frame = dynamic_cast<gpu_write_frame*>(&frame);\r
 116                 if(!gpu_frame)\r
 117                         return;\r
 118 \r
 119                 render_item item;\r
 120 \r
 121                 item.desc = gpu_frame->get_pixel_format_desc();\r
 122                 item.buffers = gpu_frame->get_plane_buffers();\r
 123                 item.transform = transform_stack_.top();\r
 124 \r
 125                 render_queue_.push_back(item);\r
 126         }\r
 127 \r
 128         void end()\r
 129         {\r
 130                 transform_stack_.pop();\r
 131         }\r
 132 \r
 133         boost::unique_future<safe_ptr<const host_buffer>> render()\r
 134         {\r
 135                 auto queue = render_queue_;\r
 136                 render_queue_.clear();\r
 137                 return ogl_device::begin_invoke([=]() -> safe_ptr<const host_buffer>\r
 138                 {\r
 139                         is_key_ = false;\r
 140                         key_target_->attach();\r
 141                         GL(glClear(GL_COLOR_BUFFER_BIT));       \r
 142 \r
 143                         // START_PASS\r
 144                         auto result = reading_;\r
 145                         result->map();\r
 146                         render_targets_[0]->attach();\r
 147                         GL(glClear(GL_COLOR_BUFFER_BIT));\r
 148 \r
 149                         BOOST_FOREACH(auto item, queue)\r
 150                                 render(item);                   \r
 151 \r
 152                         // END PASS\r
 153                         reading_ = ogl_device::create_host_buffer(format_desc_.size, host_buffer::read_only);\r
 154                         render_targets_[0]->attach();\r
 155                         render_targets_[0]->write(*reading_);\r
 156                         std::rotate(render_targets_.begin(), render_targets_.begin() + 1, render_targets_.end());\r
 157 \r
 158                         return make_safe(result);\r
 159                 });\r
 160         }\r
 161 \r
 162         void render(const render_item& item)\r
 163         {               \r
 164                 const auto desc          = item.desc;\r
 165                 auto       buffers       = item.buffers;\r
 166                 const auto transform = item.transform;\r
 167                                 \r
 168                 // Setup key and kernel\r
 169 \r
 170                 if(transform.get_is_key())\r
 171                 {\r
 172                         kernel_.apply(desc, transform, false);\r
 173                         if(!is_key_)\r
 174                         {\r
 175                                 key_target_->attach();\r
 176                                 is_key_ = true;\r
 177                                 GL(glClear(GL_COLOR_BUFFER_BIT));               \r
 178                         }\r
 179                 }               \r
 180                 else\r
 181                 {                                               \r
 182                         kernel_.apply(desc, transform, is_key_);        \r
 183                         if(is_key_)\r
 184                         {\r
 185                                 if(buffers.size() == 4)\r
 186                                         buffers.pop_back();\r
 187                                 is_key_ = false;\r
 188 \r
 189                                 render_targets_[0]->attach();                   \r
 190                                 GL(glActiveTexture(GL_TEXTURE0+3));\r
 191                                 key_target_->bind();\r
 192                         }       \r
 193                 }       \r
 194 \r
 195                 // Bind textures\r
 196 \r
 197                 std::vector<safe_ptr<device_buffer>> textures;\r
 198                 for(size_t n = 0; n < buffers.size(); ++n)\r
 199                 {\r
 200                         GL(glActiveTexture(GL_TEXTURE0+n));\r
 201                         auto texture = ogl_device::create_device_buffer(desc.planes[n].width, desc.planes[n].height, desc.planes[n].channels);\r
 202                         texture->read(*buffers[n]);\r
 203                         texture->bind();\r
 204                         textures.push_back(texture);\r
 205                 }                       \r
 206 \r
 207                 GL(glColor4d(1.0, 1.0, 1.0, transform.get_opacity()));\r
 208                 GL(glViewport(0, 0, format_desc_.width, format_desc_.height));\r
 209                                                 \r
 210                 auto m_p = transform.get_key_translation();\r
 211                 auto m_s = transform.get_key_scale();\r
 212                 double w = static_cast<double>(format_desc_.width);\r
 213                 double h = static_cast<double>(format_desc_.height);\r
 214 \r
 215                 GL(glEnable(GL_SCISSOR_TEST));\r
 216                 GL(glScissor(static_cast<size_t>(m_p[0]*w), static_cast<size_t>(m_p[1]*h), static_cast<size_t>(m_s[0]*w), static_cast<size_t>(m_s[1]*h)));\r
 217                         \r
 218                 auto f_p = transform.get_fill_translation();\r
 219                 auto f_s = transform.get_fill_scale();\r
 220                         \r
 221                 glBegin(GL_QUADS);\r
 222                         glMultiTexCoord2d(GL_TEXTURE0, 0.0, 0.0); glMultiTexCoord2d(GL_TEXTURE1,  f_p[0]        ,  f_p[1]        );             glVertex2d( f_p[0]        *2.0-1.0,  f_p[1]        *2.0-1.0);\r
 223                         glMultiTexCoord2d(GL_TEXTURE0, 1.0, 0.0); glMultiTexCoord2d(GL_TEXTURE1, (f_p[0]+f_s[0]),  f_p[1]        );             glVertex2d((f_p[0]+f_s[0])*2.0-1.0,  f_p[1]        *2.0-1.0);\r
 224                         glMultiTexCoord2d(GL_TEXTURE0, 1.0, 1.0); glMultiTexCoord2d(GL_TEXTURE1, (f_p[0]+f_s[0]), (f_p[1]+f_s[1]));             glVertex2d((f_p[0]+f_s[0])*2.0-1.0, (f_p[1]+f_s[1])*2.0-1.0);\r
 225                         glMultiTexCoord2d(GL_TEXTURE0, 0.0, 1.0); glMultiTexCoord2d(GL_TEXTURE1,  f_p[0]        , (f_p[1]+f_s[1]));             glVertex2d( f_p[0]        *2.0-1.0, (f_p[1]+f_s[1])*2.0-1.0);\r
 226                 glEnd();\r
 227                 GL(glDisable(GL_SCISSOR_TEST));         \r
 228         }\r
 229                         \r
 230         std::vector<safe_ptr<host_buffer>> create_buffers(const core::pixel_format_desc& format)\r
 231         {\r
 232                 std::vector<safe_ptr<host_buffer>> buffers;\r
 233                 std::transform(format.planes.begin(), format.planes.end(), std::back_inserter(buffers), [&](const core::pixel_format_desc::plane& plane)\r
 234                 {\r
 235                         return ogl_device::create_host_buffer(plane.size, host_buffer::write_only);\r
 236                 });\r
 237                 return buffers;\r
 238         }\r
 239 };\r
 240 \r
 241 image_mixer::image_mixer(const core::video_format_desc& format_desc) : impl_(new implementation(format_desc)){}\r
 242 void image_mixer::begin(const core::basic_frame& frame){impl_->begin(frame);}\r
 243 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 244 void image_mixer::end(){impl_->end();}\r
 245 boost::unique_future<safe_ptr<const host_buffer>> image_mixer::render(){return impl_->render();}\r
 246 std::vector<safe_ptr<host_buffer>> image_mixer::create_buffers(const core::pixel_format_desc& format){return impl_->create_buffers(format);}\r
 247 \r
 248 }}