source/texturing.cpp

   1 #include "texture.h"
   2 #include "texturing.h"
   3 #include "texunit.h"
   4
   5 using namespace std;
   6
   7 namespace Msp {
   8 namespace GL {
   9
  10 Texturing::~Texturing()
  11 {
  12         if(current()==this)
  13                 unbind();
  14 }
  15
  16 void Texturing::attach(unsigned attch, const Texture &tex)
  17 {
  18         set_attachment(attch, &tex);
  19 }
  20
  21 void Texturing::detach(unsigned attch)
  22 {
  23         set_attachment(attch, 0);
  24 }
  25
  26 void Texturing::set_attachment(unsigned attch, const Texture *tex)
  27 {
  28         if(attch>=TexUnit::get_n_units())
  29                 throw out_of_range("Texturing::set_attachment");
  30
  31         if(attachments.size()<=attch)
  32                 attachments.resize(attch+1);
  33
  34         attachments[attch].tex = tex;
  35
  36         if(current()==this)
  37                 bind_attachment(attch);
  38 }
  39
  40 void Texturing::bind_attachment(unsigned i) const
  41 {
  42         const Attachment &attch = attachments[i];
  43         if(attch.tex)
  44                 attch.tex->bind_to(i);
  45         else
  46                 Texture::unbind_from(i);
  47 }
  48
  49 void Texturing::unbind_attachment(unsigned i)
  50 {
  51         Texture::unbind_from(i);
  52 }
  53
  54 void Texturing::bind() const
  55 {
  56         const Texturing *old = current();
  57         if(set_current(this))
  58         {
  59                 for(unsigned i=0; i<attachments.size(); ++i)
  60                         bind_attachment(i);
  61                 if(old)
  62                 {
  63                         for(unsigned i=attachments.size(); i<old->attachments.size(); ++i)
  64                                 unbind_attachment(i);
  65                 }
  66         }
  67 }
  68
  69 void Texturing::unbind()
  70 {
  71         const Texturing *old = current();
  72         if(set_current(0))
  73         {
  74                 for(unsigned i=old->attachments.size(); i--;)
  75                         unbind_attachment(i);
  76         }
  77 }
  78
  79
  80 Texturing::Attachment::Attachment():
  81         tex(0)
  82 { }
  83
  84 } // namespace GL
  85 } // namespace Msp;