git.sesse.net Git - casparcg/blob - core/mixer/gpu/device_buffer.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 "device_buffer.h"\r
  23 \r
  24 #include "fence.h"\r
  25 \r
  26 #include <common/exception/exceptions.h>\r
  27 #include <common/gl/gl_check.h>\r
  28 \r
  29 #include <gl/glew.h>\r
  30 \r
  31 namespace caspar { namespace core {\r
  32         \r
  33 static GLenum FORMAT[] = {0, GL_RED, GL_RG, GL_BGR, GL_BGRA};\r
  34 static GLenum INTERNAL_FORMAT[] = {0, GL_R8, GL_RG8, GL_RGB8, GL_RGBA8};        \r
  35 \r
  36 unsigned int format(size_t stride)\r
  37 {\r
  38         return FORMAT[stride];\r
  39 }\r
  40 \r
  41 struct device_buffer::implementation : boost::noncopyable\r
  42 {\r
  43         GLuint id_;\r
  44 \r
  45         const size_t width_;\r
  46         const size_t height_;\r
  47         const size_t stride_;\r
  48 \r
  49         fence            fence_;\r
  50 \r
  51 public:\r
  52         implementation(size_t width, size_t height, size_t stride) \r
  53                 : width_(width)\r
  54                 , height_(height)\r
  55                 , stride_(stride)\r
  56         {       \r
  57                 GL(glGenTextures(1, &id_));\r
  58                 GL(glBindTexture(GL_TEXTURE_2D, id_));\r
  59                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));\r
  60                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));\r
  61                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));\r
  62                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));\r
  63                 GL(glTexImage2D(GL_TEXTURE_2D, 0, INTERNAL_FORMAT[stride_], width_, height_, 0, FORMAT[stride_], GL_UNSIGNED_BYTE, NULL));\r
  64                 GL(glBindTexture(GL_TEXTURE_2D, 0));\r
  65                 CASPAR_LOG(debug) << "[device_buffer] allocated size:" << width*height*stride;  \r
  66         }       \r
  67 \r
  68         ~implementation()\r
  69         {\r
  70                 try\r
  71                 {\r
  72                         GL(glDeleteTextures(1, &id_));\r
  73                 }\r
  74                 catch(...)\r
  75                 {\r
  76                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  77                 }\r
  78         }\r
  79         \r
  80         void bind()\r
  81         {\r
  82                 GL(glBindTexture(GL_TEXTURE_2D, id_));\r
  83         }\r
  84 \r
  85         void bind(int index)\r
  86         {\r
  87                 GL(glActiveTexture(GL_TEXTURE0+index));\r
  88                 bind();\r
  89         }\r
  90 \r
  91         void unbind()\r
  92         {\r
  93                 GL(glBindTexture(GL_TEXTURE_2D, 0));\r
  94         }\r
  95 \r
  96         void begin_read()\r
  97         {\r
  98                 bind();\r
  99                 GL(glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_, height_, FORMAT[stride_], GL_UNSIGNED_BYTE, NULL));\r
 100                 unbind();\r
 101                 fence_.set();\r
 102         }\r
 103         \r
 104         bool ready() const\r
 105         {\r
 106                 return fence_.ready();\r
 107         }\r
 108 };\r
 109 \r
 110 device_buffer::device_buffer(size_t width, size_t height, size_t stride) : impl_(new implementation(width, height, stride)){}\r
 111 size_t device_buffer::stride() const { return impl_->stride_; }\r
 112 size_t device_buffer::width() const { return impl_->width_; }\r
 113 size_t device_buffer::height() const { return impl_->height_; }\r
 114 void device_buffer::bind(){impl_->bind();}\r
 115 void device_buffer::bind(int index){impl_->bind(index);}\r
 116 void device_buffer::unbind(){impl_->unbind();}\r
 117 void device_buffer::begin_read(){impl_->begin_read();}\r
 118 bool device_buffer::ready() const{return impl_->ready();}\r
 119 int device_buffer::id() const{ return impl_->id_;}\r
 120 \r
 121 \r
 122 }}