source/backends/opengl/systemframebuffer.cpp

   1 #include <msp/gl/extensions/ext_framebuffer_object.h>
   2 #include "gl.h"
   3 #include "systemframebuffer.h"
   4
   5 namespace Msp {
   6 namespace GL {
   7
   8 OpenGLSystemFramebuffer::OpenGLSystemFramebuffer():
   9         Framebuffer(true)
  10 {
  11         FrameFormat sys_format;
  12
  13         if(EXT_framebuffer_object)
  14         {
  15                 int old_id;
  16                 glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &old_id);
  17                 if(old_id)
  18                         glBindFramebuffer(GL_DRAW_FRAMEBUFFER_BINDING, 0);
  19
  20                 int value;
  21                 glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_BACK, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &value);
  22                 if(value==GL_NONE)
  23                         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_FRONT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &value);
  24                 if(value!=GL_NONE)
  25                         sys_format = (sys_format, COLOR_ATTACHMENT);
  26
  27                 glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &value);
  28                 if(value!=GL_NONE)
  29                         sys_format = (sys_format, DEPTH_ATTACHMENT);
  30
  31                 glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &value);
  32                 if(value!=GL_NONE)
  33                         sys_format = (sys_format, STENCIL_ATTACHMENT);
  34
  35                 if(old_id)
  36                         glBindFramebuffer(GL_DRAW_FRAMEBUFFER_BINDING, old_id);
  37         }
  38         else
  39                 // Make a guess if we can't query the format
  40                 sys_format = (COLOR_ATTACHMENT, DEPTH_ATTACHMENT);
  41
  42         set_system_format(sys_format);
  43 }
  44
  45 void OpenGLSystemFramebuffer::resize(unsigned w, unsigned h)
  46 {
  47         resize_system(w, h);
  48 }
  49
  50 } // namespace GL
  51 } // namespace Msp