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 "host_buffer.h"\r
  25 #include "fence.h"\r
  26 \r
  27 #include <common/exception/exceptions.h>\r
  28 #include <common/gl/gl_check.h>\r
  29 \r
  30 #include <gl/glew.h>\r
  31 \r
  32 namespace caspar { namespace core {\r
  33         \r
  34 static GLenum FORMAT[] = {0, GL_RED, GL_RG, GL_BGR, GL_BGRA};\r
  35 static GLenum INTERNAL_FORMAT[] = {0, GL_R8, GL_RG8, GL_RGB8, GL_RGBA8};        \r
  36 \r
  37 unsigned int format(size_t stride)\r
  38 {\r
  39         return FORMAT[stride];\r
  40 }\r
  41 \r
  42 struct device_buffer::implementation : boost::noncopyable\r
  43 {\r
  44         GLuint id_;\r
  45 \r
  46         const size_t width_;\r
  47         const size_t height_;\r
  48         const size_t stride_;\r
  49 \r
  50         fence            fence_;\r
  51 \r
  52 public:\r
  53         implementation(size_t width, size_t height, size_t stride) \r
  54                 : width_(width)\r
  55                 , height_(height)\r
  56                 , stride_(stride)\r
  57         {       \r
  58                 GL(glGenTextures(1, &id_));\r
  59                 GL(glBindTexture(GL_TEXTURE_2D, id_));\r
  60                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));\r
  61                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));\r
  62                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));\r
  63                 GL(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));\r
  64                 GL(glTexImage2D(GL_TEXTURE_2D, 0, INTERNAL_FORMAT[stride_], width_, height_, 0, FORMAT[stride_], GL_UNSIGNED_BYTE, NULL));\r
  65                 GL(glBindTexture(GL_TEXTURE_2D, 0));\r
  66                 CASPAR_LOG(debug) << "[device_buffer] allocated size:" << width*height*stride;  \r
  67                 clear();\r
  68         }       \r
  69 \r
  70         ~implementation()\r
  71         {\r
  72                 try\r
  73                 {\r
  74                         GL(glDeleteTextures(1, &id_));\r
  75                 }\r
  76                 catch(...)\r
  77                 {\r
  78                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  79                 }\r
  80         }\r
  81         \r
  82         void bind()\r
  83         {\r
  84                 GL(glBindTexture(GL_TEXTURE_2D, id_));\r
  85         }\r
  86 \r
  87         void bind(int index)\r
  88         {\r
  89                 GL(glActiveTexture(GL_TEXTURE0+index));\r
  90                 bind();\r
  91         }\r
  92 \r
  93         void unbind()\r
  94         {\r
  95                 GL(glBindTexture(GL_TEXTURE_2D, 0));\r
  96         }\r
  97 \r
  98         void begin_read(host_buffer& source)\r
  99         {\r
 100                 bind();\r
 101                 source.unmap();\r
 102                 source.bind();\r
 103                 GL(glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_, height_, FORMAT[stride_], GL_UNSIGNED_BYTE, NULL));\r
 104                 source.unbind();\r
 105                 unbind();\r
 106                 fence_.set();\r
 107                 //GL(glFlush());\r
 108         }\r
 109         \r
 110         void attach(int index)\r
 111         {\r
 112                 GL(glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + index, GL_TEXTURE_2D, id_, 0));\r
 113         }\r
 114 \r
 115         void clear()\r
 116         {\r
 117                 attach(0);\r
 118                 GL(glClear(GL_COLOR_BUFFER_BIT));\r
 119         }\r
 120 \r
 121         bool ready() const\r
 122         {\r
 123                 return fence_.ready();\r
 124         }\r
 125 };\r
 126 \r
 127 device_buffer::device_buffer(size_t width, size_t height, size_t stride) : impl_(new implementation(width, height, stride)){}\r
 128 size_t device_buffer::stride() const { return impl_->stride_; }\r
 129 size_t device_buffer::width() const { return impl_->width_; }\r
 130 size_t device_buffer::height() const { return impl_->height_; }\r
 131 void device_buffer::attach(int index){impl_->attach(index);}\r
 132 void device_buffer::bind(){impl_->bind();}\r
 133 void device_buffer::bind(int index){impl_->bind(index);}\r
 134 void device_buffer::unbind(){impl_->unbind();}\r
 135 void device_buffer::begin_read(host_buffer& source){impl_->begin_read(source);}\r
 136 void device_buffer::clear(){impl_->clear();}\r
 137 bool device_buffer::ready() const{return impl_->ready();}\r
 138 \r
 139 \r
 140 }}