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/cast.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 \r
  57         std::shared_ptr<host_buffer> reading_;\r
  58 \r
  59         image_kernel kernel_;\r
  60 \r
  61         struct keyer\r
  62         {\r
  63                 std::shared_ptr<device_buffer> key;\r
  64                 size_t depth;\r
  65         } keyer_;\r
  66 \r
  67 public:\r
  68         implementation(const core::video_format_desc& format_desc) \r
  69                 : format_desc_(format_desc)\r
  70         {\r
  71                 ogl_device::invoke([]\r
  72                 {\r
  73                         if(!GLEE_VERSION_3_0)\r
  74                                 BOOST_THROW_EXCEPTION(not_supported() << msg_info("Missing OpenGL 3.0 support."));\r
  75                 });\r
  76                 \r
  77                 ogl_device::begin_invoke([=]\r
  78                 {\r
  79                         transform_stack_.push(core::image_transform());\r
  80                         transform_stack_.top().set_mode(core::video_mode::progressive);\r
  81 \r
  82                         GL(glEnable(GL_TEXTURE_2D));\r
  83                         GL(glDisable(GL_DEPTH_TEST));           \r
  84 \r
  85                         render_targets_[0] = ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4);\r
  86                         render_targets_[1] = ogl_device::create_device_buffer(format_desc.width, format_desc.height, 4);\r
  87                         \r
  88                         GL(glGenFramebuffers(1, &fbo_));                \r
  89                         GL(glBindFramebuffer(GL_FRAMEBUFFER_EXT, fbo_));\r
  90                         GL(glReadBuffer(GL_COLOR_ATTACHMENT0_EXT));\r
  91 \r
  92                         reading_ = ogl_device::create_host_buffer(format_desc_.size, host_buffer::read_only);\r
  93                 });\r
  94         }\r
  95 \r
  96         ~implementation()\r
  97         {\r
  98                 glDeleteFramebuffersEXT(1, &fbo_);\r
  99         }\r
 100 \r
 101         void begin(const core::basic_frame& frame)\r
 102         {\r
 103                 transform_stack_.push(transform_stack_.top()*frame.get_image_transform());\r
 104         }\r
 105                 \r
 106         void visit(core::write_frame& frame)\r
 107         {\r
 108                 auto gpu_frame = dynamic_cast<gpu_write_frame*>(&frame);\r
 109                 if(!gpu_frame)\r
 110                         return;\r
 111 \r
 112                 auto desc               = gpu_frame->get_pixel_format_desc();\r
 113                 auto buffers    = gpu_frame->get_plane_buffers();\r
 114                 auto transform  = transform_stack_.top();\r
 115                 \r
 116                 if(buffers.empty())             \r
 117                         return;\r
 118 \r
 119                 ogl_device::begin_invoke([=]\r
 120                 {                                                               \r
 121                         if(transform.get_key_depth() > 0) // Its a key_frame just save buffer for next frame.\r
 122                         {\r
 123                                 auto texture = create_device_buffer(desc.planes[0]);\r
 124                                 texture->read(*buffers[0]);\r
 125                                 keyer_.key = texture;\r
 126                                 keyer_.depth = transform.get_key_depth();                                               \r
 127                         }\r
 128                         else\r
 129                         {                               \r
 130                                 const bool   has_separate_key = keyer_.depth > 0;\r
 131                                 const size_t max_index            = has_separate_key ? 3 : 4;\r
 132                                 \r
 133                                 std::vector<safe_ptr<device_buffer>> device_buffers;\r
 134                                 for(size_t n = 0; n < std::min(max_index, buffers.size()); ++n)\r
 135                                 {\r
 136                                         auto texture = create_device_buffer(desc.planes[n]);\r
 137                                         texture->read(*buffers[n]);\r
 138                                         device_buffers.push_back(texture);\r
 139                                 }       \r
 140 \r
 141                                 if(has_separate_key && keyer_.key)\r
 142                                         device_buffers.push_back(make_safe(keyer_.key));\r
 143 \r
 144                                 for(size_t n = 0; n < device_buffers.size(); ++n)\r
 145                                 {\r
 146                                         GL(glActiveTexture(GL_TEXTURE0+n));\r
 147                                         device_buffers[n]->bind();\r
 148                                 }\r
 149                                                 \r
 150                                 GL(glColor4d(1.0, 1.0, 1.0, transform.get_opacity()));\r
 151                                 GL(glViewport(0, 0, format_desc_.width, format_desc_.height));\r
 152                                 kernel_.apply(desc, transform, has_separate_key);\r
 153                                                 \r
 154                                 auto m_p = transform.get_key_translation();\r
 155                                 auto m_s = transform.get_key_scale();\r
 156                                 auto w   = static_cast<double>(format_desc_.width);\r
 157                                 auto h   = static_cast<double>(format_desc_.height);\r
 158                         \r
 159                                 GL(glEnable(GL_SCISSOR_TEST));\r
 160                                 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
 161                         \r
 162                                 auto f_p = transform.get_fill_translation();\r
 163                                 auto f_s = transform.get_fill_scale();\r
 164                         \r
 165                                 glBegin(GL_QUADS);\r
 166                                         glTexCoord2d(0.0, 0.0); glVertex2d( f_p[0]        *2.0-1.0,      f_p[1]        *2.0-1.0);\r
 167                                         glTexCoord2d(1.0, 0.0); glVertex2d((f_p[0]+f_s[0])*2.0-1.0,  f_p[1]        *2.0-1.0);\r
 168                                         glTexCoord2d(1.0, 1.0); glVertex2d((f_p[0]+f_s[0])*2.0-1.0, (f_p[1]+f_s[1])*2.0-1.0);\r
 169                                         glTexCoord2d(0.0, 1.0); glVertex2d( f_p[0]        *2.0-1.0, (f_p[1]+f_s[1])*2.0-1.0);\r
 170                                 glEnd();\r
 171                                 GL(glDisable(GL_SCISSOR_TEST));         \r
 172 \r
 173                                 if(keyer_.depth == 0)\r
 174                                         keyer_.key.reset();\r
 175                                 else\r
 176                                         --keyer_.depth;\r
 177                         }\r
 178                 });\r
 179         }\r
 180 \r
 181         void end()\r
 182         {\r
 183                 transform_stack_.pop();\r
 184         }\r
 185 \r
 186         boost::unique_future<safe_ptr<const host_buffer>> begin_pass()\r
 187         {\r
 188                 return ogl_device::begin_invoke([=]() -> safe_ptr<const host_buffer>\r
 189                 {\r
 190                         keyer_.depth = 0;\r
 191                         reading_->map();\r
 192                         render_targets_[0]->attach(0);\r
 193                         GL(glClear(GL_COLOR_BUFFER_BIT));\r
 194                         return safe_ptr<const host_buffer>(reading_);\r
 195                 });\r
 196         }\r
 197 \r
 198         void end_pass()\r
 199         {\r
 200                 ogl_device::begin_invoke([=]\r
 201                 {\r
 202                         reading_ = ogl_device::create_host_buffer(format_desc_.size, host_buffer::read_only);\r
 203                         render_targets_[0]->write(*reading_);\r
 204                         std::rotate(render_targets_.begin(), render_targets_.begin() + 1, render_targets_.end());\r
 205                 });\r
 206         }\r
 207 \r
 208         safe_ptr<device_buffer> create_device_buffer(const core::pixel_format_desc::plane& plane)\r
 209         {\r
 210                 return ogl_device::create_device_buffer(plane.width, plane.height, plane.channels);\r
 211         }\r
 212                 \r
 213         std::vector<safe_ptr<host_buffer>> create_buffers(const core::pixel_format_desc& format)\r
 214         {\r
 215                 std::vector<safe_ptr<host_buffer>> buffers;\r
 216                 std::transform(format.planes.begin(), format.planes.end(), std::back_inserter(buffers), [&](const core::pixel_format_desc::plane& plane)\r
 217                 {\r
 218                         return ogl_device::create_host_buffer(plane.size, host_buffer::write_only);\r
 219                 });\r
 220                 return buffers;\r
 221         }\r
 222 };\r
 223 \r
 224 image_mixer::image_mixer(const core::video_format_desc& format_desc) : impl_(new implementation(format_desc)){}\r
 225 void image_mixer::begin(const core::basic_frame& frame){impl_->begin(frame);}\r
 226 void image_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 227 void image_mixer::end(){impl_->end();}\r
 228 boost::unique_future<safe_ptr<const host_buffer>> image_mixer::begin_pass(){    return impl_->begin_pass();}\r
 229 void image_mixer::end_pass(){impl_->end_pass();}\r
 230 std::vector<safe_ptr<host_buffer>> image_mixer::create_buffers(const core::pixel_format_desc& format){return impl_->create_buffers(format);}\r
 231 \r
 232 }}