source/framebuffer.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgl
   4 Copyright © 2007  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include "extension.h"
   9 #include "ext_framebuffer_object.h"
  10 #include "framebuffer.h"
  11 #include "renderbuffer.h"
  12 #include "texture2d.h"
  13
  14 namespace Msp {
  15 namespace GL {
  16
  17 Framebuffer::Framebuffer()
  18 {
  19         static RequireExtension _ext("GL_EXT_framebuffer_object");
  20
  21         glGenFramebuffersEXT(1, &id);
  22         bind();
  23 }
  24
  25 Framebuffer::~Framebuffer()
  26 {
  27         glDeleteFramebuffersEXT(1, &id);
  28 }
  29
  30 void Framebuffer::bind() const
  31 {
  32         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, id);
  33         cur_fbo=this;
  34 }
  35
  36 void Framebuffer::attach(FramebufferAttachment attch, Renderbuffer &rbuf)
  37 {
  38         maybe_bind();
  39         glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, attch, GL_RENDERBUFFER_EXT, rbuf.get_id());
  40 }
  41
  42 void Framebuffer::attach(FramebufferAttachment attch, Texture2D &tex, int level)
  43 {
  44         maybe_bind();
  45         glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, attch, tex.get_target(), tex.get_id(), level);
  46 }
  47
  48 FramebufferStatus Framebuffer::check_status() const
  49 {
  50         maybe_bind();
  51         return static_cast<FramebufferStatus>(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT));
  52 }
  53
  54 const Framebuffer *Framebuffer::current()
  55 {
  56         return cur_fbo;
  57 }
  58
  59 void Framebuffer::unbind()
  60 {
  61         if(cur_fbo)
  62         {
  63                 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
  64                 cur_fbo=0;
  65         }
  66 }
  67
  68 void Framebuffer::maybe_bind() const
  69 {
  70         if(cur_fbo!=this)
  71                 bind();
  72 }
  73
  74 const Framebuffer *Framebuffer::cur_fbo=0;
  75
  76 } // namespace GL
  77 } // namespace Msp