source/texturing.cpp

   1 #include "texenv.h"
   2 #include "texture.h"
   3 #include "texturing.h"
   4 #include "texunit.h"
   5
   6 using namespace std;
   7
   8 namespace Msp {
   9 namespace GL {
  10
  11 Texturing::~Texturing()
  12 {
  13         if(current()==this)
  14                 unbind();
  15 }
  16
  17 void Texturing::attach(unsigned attch, const Texture &tex)
  18 {
  19         set_attachment(attch, &tex, 0);
  20 }
  21
  22 void Texturing::attach(unsigned attch, const Texture &tex, const TexEnv &env)
  23 {
  24         set_attachment(attch, &tex, &env);
  25 }
  26
  27 void Texturing::detach(unsigned attch)
  28 {
  29         set_attachment(attch, 0, 0);
  30 }
  31
  32 void Texturing::set_attachment(unsigned attch, const Texture *tex, const TexEnv *env)
  33 {
  34         if(attch>=TexUnit::get_n_units())
  35                 throw out_of_range("Texturing::set_attachment");
  36
  37         if(attachments.size()<=attch)
  38                 attachments.resize(attch+1);
  39
  40         attachments[attch].tex = tex;
  41         attachments[attch].env = env;
  42
  43         if(current()==this)
  44                 bind_attachment(attch);
  45 }
  46
  47 void Texturing::bind_attachment(unsigned i) const
  48 {
  49         const Attachment &attch = attachments[i];
  50         TexUnit::activate(i);
  51         if(attch.tex)
  52                 attch.tex->bind();
  53         else
  54                 Texture::unbind();
  55         if(attch.env)
  56                 attch.env->bind();
  57         else
  58                 TexEnv::unbind();
  59 }
  60
  61 void Texturing::unbind_attachment(unsigned i)
  62 {
  63         TexUnit::activate(i);
  64         Texture::unbind();
  65         TexEnv::unbind();
  66 }
  67
  68 void Texturing::bind() const
  69 {
  70         const Texturing *old = current();
  71         if(set_current(this))
  72         {
  73                 for(unsigned i=0; i<attachments.size(); ++i)
  74                         bind_attachment(i);
  75                 if(old)
  76                 {
  77                         for(unsigned i=attachments.size(); i<old->attachments.size(); ++i)
  78                                 unbind_attachment(i);
  79                 }
  80         }
  81 }
  82
  83 void Texturing::unbind()
  84 {
  85         const Texturing *old = current();
  86         if(set_current(0))
  87         {
  88                 for(unsigned i=old->attachments.size(); i--;)
  89                         unbind_attachment(i);
  90         }
  91 }
  92
  93
  94 Texturing::Attachment::Attachment():
  95         tex(0),
  96         env(0)
  97 { }
  98
  99 } // namespace GL
 100 } // namespace Msp;