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 \r
  26 namespace caspar { namespace core {\r
  27         \r
  28 GLenum FORMAT[] = {0, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_BGR, GL_BGRA};\r
  29 GLenum INTERNAL_FORMAT[] = {0, GL_LUMINANCE8, GL_LUMINANCE8_ALPHA8, GL_RGB8, GL_RGBA8}; \r
  30 \r
  31 struct device_buffer::implementation : boost::noncopyable\r
  32 {\r
  33         GLuint id_;\r
  34 \r
  35         const size_t width_;\r
  36         const size_t height_;\r
  37         const size_t stride_;\r
  38 \r
  39 public:\r
  40         implementation(size_t width, size_t height, size_t stride) \r
  41                 : width_(width)\r
  42                 , height_(height)\r
  43                 , stride_(stride)\r
  44         {       \r
  45                 GL(glGenTextures(1, &id_));\r
  46                 GL(glBindTexture(GL_TEXTURE_2D, id_));\r
  47                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));\r
  48                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));\r
  49                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));\r
  50                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));\r
  51                 GL(glTexImage2D(GL_TEXTURE_2D, 0, INTERNAL_FORMAT[stride_], width_, height_, 0, FORMAT[stride_], GL_UNSIGNED_BYTE, NULL));\r
  52                 GL(glBindTexture(GL_TEXTURE_2D, 0));\r
  53                 CASPAR_LOG(trace) << "[device_buffer] allocated size:" << width*height*stride;  \r
  54         }       \r
  55 \r
  56         ~implementation()\r
  57         {\r
  58                 GL(glDeleteTextures(1, &id_));\r
  59         }\r
  60         \r
  61         void bind()\r
  62         {\r
  63                 GL(glBindTexture(GL_TEXTURE_2D, id_));\r
  64         }\r
  65 \r
  66         void bind(int index)\r
  67         {\r
  68                 GL(glActiveTexture(GL_TEXTURE0+index));\r
  69                 bind();\r
  70         }\r
  71 \r
  72         void unbind()\r
  73         {\r
  74                 GL(glBindTexture(GL_TEXTURE_2D, 0));\r
  75         }\r
  76 \r
  77         void read(host_buffer& source)\r
  78         {\r
  79                 GL(glBindTexture(GL_TEXTURE_2D, id_));\r
  80                 source.unmap();\r
  81                 source.bind();\r
  82                 GL(glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_, height_, FORMAT[stride_], GL_UNSIGNED_BYTE, NULL));\r
  83                 source.unbind();\r
  84                 GL(glBindTexture(GL_TEXTURE_2D, 0));\r
  85         }\r
  86         \r
  87         void write(host_buffer& target)\r
  88         {\r
  89                 attach(0);\r
  90                 GL(glBindTexture(GL_TEXTURE_2D, id_));\r
  91                 target.unmap();\r
  92                 target.bind();\r
  93                 GL(glReadPixels(0, 0, width_, height_, FORMAT[stride_], GL_UNSIGNED_BYTE, NULL));\r
  94                 target.unbind();\r
  95                 GL(glBindTexture(GL_TEXTURE_2D, 0));\r
  96         }\r
  97 \r
  98         void attach(int index)\r
  99         {\r
 100                 GL(glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + index, GL_TEXTURE_2D, id_, 0));\r
 101         }\r
 102 \r
 103         void clear()\r
 104         {\r
 105                 attach(0);\r
 106                 GL(glClear(GL_COLOR_BUFFER_BIT));\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::attach(int index){impl_->attach(index);}\r
 115 void device_buffer::bind(){impl_->bind();}\r
 116 void device_buffer::bind(int index){impl_->bind(index);}\r
 117 void device_buffer::unbind(){impl_->unbind();}\r
 118 void device_buffer::read(host_buffer& source){impl_->read(source);}\r
 119 void device_buffer::write(host_buffer& target){impl_->write(target);}\r
 120 void device_buffer::clear(){impl_->clear();}\r
 121 \r
 122 }}