git.sesse.net Git - casparcg/blob - core/mixer/image/image_mixer.cpp

   1 #include "../../StdAfx.h"\r
   2 \r
   3 #include "image_mixer.h"\r
   4 #include "image_kernel.h"\r
   5 #include "image_transform.h"\r
   6 \r
   7 #include "../gpu/ogl_device.h"\r
   8 #include "../gpu/host_buffer.h"\r
   9 #include "../gpu/device_buffer.h"\r
  10 \r
  11 #include <common/exception/exceptions.h>\r
  12 #include <common/gl/gl_check.h>\r
  13 #include <common/concurrency/executor.h>\r
  14 \r
  15 #include <Glee.h>\r
  16 #include <SFML/Window/Context.hpp>\r
  17 #include <unordered_map>\r
  18 \r
  19 namespace caspar { namespace core {\r
  20                 \r
  21 struct image_mixer::implementation : boost::noncopyable\r
  22 {                       \r
  23         const video_format_desc format_desc_;\r
  24         \r
  25         std::stack<image_transform> transform_stack_;\r
  26 \r
  27         GLuint fbo_;\r
  28         std::array<std::shared_ptr<device_buffer>, 2> render_targets_;\r
  29 \r
  30         std::shared_ptr<host_buffer> reading_;\r
  31 \r
  32         image_kernel kernel_;\r
  33 \r
  34         safe_ptr<ogl_device> context_;\r
  35 \r
  36 public:\r
  37         implementation(const video_format_desc& format_desc) \r
  38                 : format_desc_(format_desc)\r
  39                 , context_(ogl_device::create())\r
  40         {\r
  41                 context_->begin_invoke([=]\r
  42                 {\r
  43                         transform_stack_.push(image_transform());\r
  44                         transform_stack_.top().set_mode(video_mode::progressive);\r
  45 \r
  46                         GL(glEnable(GL_TEXTURE_2D));\r
  47                         GL(glEnable(GL_STENCIL_TEST));\r
  48                         GL(glEnable(GL_SCISSOR_TEST));\r
  49                         GL(glDisable(GL_DEPTH_TEST));           \r
  50 \r
  51                         render_targets_[0] = context_->create_device_buffer(format_desc.width, format_desc.height, 4);\r
  52                         render_targets_[1] = context_->create_device_buffer(format_desc.width, format_desc.height, 4);\r
  53                         \r
  54                         GL(glGenFramebuffers(1, &fbo_));                \r
  55                         GL(glBindFramebuffer(GL_FRAMEBUFFER_EXT, fbo_));\r
  56                         GL(glReadBuffer(GL_COLOR_ATTACHMENT0_EXT));\r
  57 \r
  58                         reading_ = context_->create_host_buffer(format_desc_.size, host_buffer::read_only);\r
  59                 });\r
  60         }\r
  61 \r
  62         ~implementation()\r
  63         {\r
  64                 glDeleteFramebuffersEXT(1, &fbo_);\r
  65         }\r
  66 \r
  67         void begin(const image_transform& transform)\r
  68         {\r
  69                 transform_stack_.push(transform_stack_.top()*transform);\r
  70         }\r
  71                 \r
  72         void render(const pixel_format_desc& desc, std::vector<safe_ptr<host_buffer>>& buffers)\r
  73         {\r
  74                 auto transform = transform_stack_.top();\r
  75                 context_->begin_invoke([=]\r
  76                 {\r
  77                         GL(glColor4d(1.0, 1.0, 1.0, transform.get_opacity()));\r
  78                         GL(glViewport(0, 0, format_desc_.width, format_desc_.height));\r
  79                         kernel_.apply(desc.pix_fmt, transform);\r
  80 \r
  81                         std::vector<safe_ptr<device_buffer>> device_buffers;\r
  82                         for(size_t n = 0; n < buffers.size(); ++n)\r
  83                         {\r
  84                                 auto texture = context_->create_device_buffer(desc.planes[n].width, desc.planes[n].height, desc.planes[n].channels);\r
  85                                 texture->read(*buffers[n]);\r
  86                                 device_buffers.push_back(texture);\r
  87                         }\r
  88 \r
  89                         for(size_t n = 0; n < buffers.size(); ++n)\r
  90                         {\r
  91                                 glActiveTexture(GL_TEXTURE0+n);\r
  92                                 device_buffers[n]->bind();\r
  93                         }\r
  94 \r
  95                         auto m_p = transform.get_mask_translation();\r
  96                         auto m_s = transform.get_mask_scale();\r
  97                         double w = static_cast<double>(format_desc_.width);\r
  98                         double h = static_cast<double>(format_desc_.height);\r
  99 \r
 100                         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
 101                         \r
 102                         auto f_p = transform.get_image_translation();\r
 103                         auto f_s = transform.get_image_scale();\r
 104                         \r
 105                         glBegin(GL_QUADS);\r
 106                                 glTexCoord2d(0.0, 0.0); glVertex2d( f_p[0]        *2.0-1.0,      f_p[1]        *2.0-1.0);\r
 107                                 glTexCoord2d(1.0, 0.0); glVertex2d((f_p[0]+f_s[0])*2.0-1.0,  f_p[1]        *2.0-1.0);\r
 108                                 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
 109                                 glTexCoord2d(0.0, 1.0); glVertex2d( f_p[0]        *2.0-1.0, (f_p[1]+f_s[1])*2.0-1.0);\r
 110                         glEnd();\r
 111 \r
 112                         GL(glScissor(0, 0, format_desc_.width, format_desc_.height));\r
 113                 });\r
 114         }\r
 115 \r
 116         void end()\r
 117         {\r
 118                 transform_stack_.pop();\r
 119         }\r
 120 \r
 121         boost::unique_future<safe_ptr<const host_buffer>> begin_pass()\r
 122         {\r
 123                 return context_->begin_invoke([=]() -> safe_ptr<const host_buffer>\r
 124                 {\r
 125                         reading_->map();\r
 126                         render_targets_[0]->attach(0);\r
 127                         GL(glClear(GL_COLOR_BUFFER_BIT));\r
 128                         return safe_ptr<const host_buffer>(reading_);\r
 129                 });\r
 130         }\r
 131 \r
 132         void end_pass()\r
 133         {\r
 134                 context_->begin_invoke([=]\r
 135                 {\r
 136                         reading_ = context_->create_host_buffer(format_desc_.size, host_buffer::read_only);\r
 137                         render_targets_[0]->write(*reading_);\r
 138                         std::rotate(render_targets_.begin(), render_targets_.begin() + 1, render_targets_.end());\r
 139                 });\r
 140         }\r
 141                 \r
 142         std::vector<safe_ptr<host_buffer>> create_buffers(const pixel_format_desc& format)\r
 143         {\r
 144                 std::vector<safe_ptr<host_buffer>> buffers;\r
 145                 std::transform(format.planes.begin(), format.planes.end(), std::back_inserter(buffers), [&](const pixel_format_desc::plane& plane) -> safe_ptr<host_buffer>\r
 146                 {\r
 147                         return context_->create_host_buffer(plane.size, host_buffer::write_only);\r
 148                 });\r
 149                 return buffers;\r
 150         }\r
 151 };\r
 152 \r
 153 image_mixer::image_mixer(const video_format_desc& format_desc) : impl_(new implementation(format_desc)){}\r
 154 void image_mixer::begin(const image_transform& transform) {     impl_->begin(transform);}\r
 155 void image_mixer::process(const pixel_format_desc& desc, std::vector<safe_ptr<host_buffer>>& buffers){  impl_->render(desc, buffers);}\r
 156 void image_mixer::end(){impl_->end();}\r
 157 boost::unique_future<safe_ptr<const host_buffer>> image_mixer::begin_pass(){    return impl_->begin_pass();}\r
 158 void image_mixer::end_pass(){impl_->end_pass();}\r
 159 std::vector<safe_ptr<host_buffer>> image_mixer::create_buffers(const pixel_format_desc& format){return impl_->create_buffers(format);}\r
 160 \r
 161 }}