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 <common/gl/gl_check.h>\r
  25 namespace caspar { namespace mixer {\r
  26         \r
  27 GLenum FORMAT[] = {0, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_BGR, GL_BGRA};\r
  28 GLenum INTERNAL_FORMAT[] = {0, GL_LUMINANCE8, GL_LUMINANCE8_ALPHA8, GL_RGB8, GL_RGBA8}; \r
  29 \r
  30 struct device_buffer::implementation : boost::noncopyable\r
  31 {\r
  32         GLuint id_;\r
  33 \r
  34         const size_t width_;\r
  35         const size_t height_;\r
  36         const size_t stride_;\r
  37 \r
  38 public:\r
  39         implementation(size_t width, size_t height, size_t stride) \r
  40                 : width_(width)\r
  41                 , height_(height)\r
  42                 , stride_(stride)\r
  43         {       \r
  44                 GL(glGenTextures(1, &id_));\r
  45                 GL(glBindTexture(GL_TEXTURE_2D, id_));\r
  46                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));\r
  47                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));\r
  48                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));\r
  49                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));\r
  50                 GL(glTexImage2D(GL_TEXTURE_2D, 0, INTERNAL_FORMAT[stride_], width_, height_, 0, FORMAT[stride_], GL_UNSIGNED_BYTE, NULL));\r
  51                 GL(glBindTexture(GL_TEXTURE_2D, 0));\r
  52                 //CASPAR_LOG(trace) << "[device_buffer] allocated size:" << width*height*stride;        \r
  53         }       \r
  54 \r
  55         ~implementation()\r
  56         {\r
  57                 GL(glDeleteTextures(1, &id_));\r
  58         }\r
  59         \r
  60         void bind()\r
  61         {\r
  62                 GL(glBindTexture(GL_TEXTURE_2D, id_));\r
  63         }\r
  64 \r
  65         void unbind()\r
  66         {\r
  67                 GL(glBindTexture(GL_TEXTURE_2D, 0));\r
  68         }\r
  69 \r
  70         void read(host_buffer& source)\r
  71         {\r
  72                 GL(glBindTexture(GL_TEXTURE_2D, id_));\r
  73                 source.unmap();\r
  74                 source.bind();\r
  75                 GL(glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_, height_, FORMAT[stride_], GL_UNSIGNED_BYTE, NULL));\r
  76                 source.unbind();\r
  77                 GL(glBindTexture(GL_TEXTURE_2D, 0));\r
  78         }\r
  79         \r
  80         void write(host_buffer& target)\r
  81         {\r
  82                 GL(glBindTexture(GL_TEXTURE_2D, id_));\r
  83                 target.unmap();\r
  84                 target.bind();\r
  85                 GL(glReadPixels(0, 0, width_, height_, FORMAT[stride_], GL_UNSIGNED_BYTE, NULL));\r
  86                 target.unbind();\r
  87                 GL(glBindTexture(GL_TEXTURE_2D, 0));\r
  88         }\r
  89 \r
  90         void attach(int index)\r
  91         {\r
  92                 GL(glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + index, GL_TEXTURE_2D, id_, 0));\r
  93         }\r
  94 };\r
  95 \r
  96 device_buffer::device_buffer(size_t width, size_t height, size_t stride) : impl_(new implementation(width, height, stride)){}\r
  97 size_t device_buffer::stride() const { return impl_->stride_; }\r
  98 size_t device_buffer::width() const { return impl_->width_; }\r
  99 size_t device_buffer::height() const { return impl_->height_; }\r
 100 void device_buffer::attach(int index){impl_->attach(index);}\r
 101 void device_buffer::bind(){impl_->bind();}\r
 102 void device_buffer::unbind(){impl_->unbind();}\r
 103 void device_buffer::read(host_buffer& source){impl_->read(source);}\r
 104 void device_buffer::write(host_buffer& target){impl_->write(target);}\r
 105 \r
 106 }}