source/texturing.cpp

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