source/texture.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 "except.h"
   9 #include "texture.h"
  10 #include "texunit.h"
  11
  12 namespace Msp {
  13 namespace GL {
  14
  15 void Texture::bind() const
  16 {
  17         if(!target)
  18                 throw InvalidState("Attempt to bind a texture without target");
  19
  20         const Texture *cur=TexUnit::current().get_texture();
  21         if(cur && cur->target!=target)
  22                 glDisable(cur->target);
  23         if(!cur || cur->target!=target)
  24                 glEnable(target);
  25         glBindTexture(target, id);
  26         TexUnit::current().set_texture(this);
  27 }
  28
  29 void Texture::parameter(GLenum param, int value)
  30 {
  31         maybe_bind();
  32
  33         glTexParameteri(target, param, value);
  34 }
  35
  36 void Texture::parameter(GLenum param, float value)
  37 {
  38         maybe_bind();
  39
  40         glTexParameterf(target, param, value);
  41 }
  42
  43 Texture::~Texture()
  44 {
  45         glDeleteTextures(1, &id);
  46 }
  47
  48 void Texture::unbind()
  49 {
  50         const Texture *cur=TexUnit::current().get_texture();
  51         if(!cur)
  52                 return;
  53
  54         glBindTexture(cur->target, 0);
  55         glDisable(cur->target);
  56         TexUnit::current().set_texture(0);
  57 }
  58
  59 Texture::Texture():
  60         target(0)
  61 {
  62         glGenTextures(1, &id);
  63 }
  64
  65 void Texture::maybe_bind() const
  66 {
  67         if(TexUnit::current().get_texture()!=this)
  68                 bind();
  69 }
  70
  71 } // namespace GL
  72 } // namespace Msp