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;
  35
  36         if(current()==this)
  37                 bind_attachment(attch);
  38 }
  39
  40 const Texture *Texturing::get_attached_texture(unsigned i) const
  41 {
  42         return i<attachments.size() ? attachments[i] : 0;
  43 }
  44
  45 void Texturing::bind_attachment(unsigned i) const
  46 {
  47         if(const Texture *tex = attachments[i])
  48                 tex->bind_to(i);
  49         else
  50                 Texture::unbind_from(i);
  51 }
  52
  53 void Texturing::unbind_attachment(unsigned i)
  54 {
  55         Texture::unbind_from(i);
  56 }
  57
  58 void Texturing::bind() const
  59 {
  60         const Texturing *old = current();
  61         if(set_current(this))
  62         {
  63                 for(unsigned i=0; i<attachments.size(); ++i)
  64                         bind_attachment(i);
  65                 if(old)
  66                 {
  67                         for(unsigned i=attachments.size(); i<old->attachments.size(); ++i)
  68                                 unbind_attachment(i);
  69                 }
  70         }
  71 }
  72
  73 void Texturing::unbind()
  74 {
  75         const Texturing *old = current();
  76         if(set_current(0))
  77         {
  78                 for(unsigned i=old->attachments.size(); i--;)
  79                         unbind_attachment(i);
  80         }
  81 }
  82
  83 } // namespace GL
  84 } // namespace Msp;