source/texture.cpp

   1 #include <msp/core/error.h>
   2 #include "texture.h"
   3 #include "texunit.h"
   4
   5 namespace Msp {
   6 namespace GL {
   7
   8 void Texture::bind() const
   9 {
  10         if(!target)
  11                 throw InvalidState("Attempt to bind a texture without target");
  12
  13         const Texture *cur=TexUnit::current().get_texture();
  14         if(cur && cur->target!=target)
  15                 glDisable(cur->target);
  16         if(!cur || cur->target!=target)
  17                 glEnable(target);
  18         glBindTexture(target, id);
  19         TexUnit::current().set_texture(this);
  20 }
  21
  22 void Texture::parameter(GLenum param, int value)
  23 {
  24         maybe_bind();
  25
  26         glTexParameteri(target, param, value);
  27 }
  28
  29 void Texture::parameter(GLenum param, float value)
  30 {
  31         maybe_bind();
  32
  33         glTexParameterf(target, param, value);
  34 }
  35
  36 Texture::~Texture()
  37 {
  38         glDeleteTextures(1, &id);
  39 }
  40
  41 void Texture::unbind()
  42 {
  43         const Texture *cur=TexUnit::current().get_texture();
  44         if(!cur)
  45                 return;
  46
  47         glBindTexture(cur->target, 0);
  48         glDisable(cur->target);
  49         TexUnit::current().set_texture(0);
  50 }
  51
  52 Texture::Texture():
  53         target(0)
  54 {
  55         glGenTextures(1, &id);
  56 }
  57
  58 void Texture::maybe_bind() const
  59 {
  60         if(TexUnit::current().get_texture()!=this)
  61                 bind();
  62 }
  63
  64 } // namespace GL
  65 } // namespace Msp