source/texturing.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgl
   4 Copyright © 2010  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include "texenv.h"
   9 #include "texture.h"
  10 #include "texturing.h"
  11 #include "texunit.h"
  12
  13 namespace Msp {
  14 namespace GL {
  15
  16 Texturing::~Texturing()
  17 {
  18         if(current()==this)
  19                 unbind();
  20 }
  21
  22 void Texturing::attach(unsigned attch, const Texture &tex)
  23 {
  24         set_attachment(attch, &tex, 0);
  25 }
  26
  27 void Texturing::attach(unsigned attch, const Texture &tex, const TexEnv &env)
  28 {
  29         set_attachment(attch, &tex, &env);
  30 }
  31
  32 void Texturing::detach(unsigned attch)
  33 {
  34         set_attachment(attch, 0, 0);
  35 }
  36
  37 void Texturing::set_attachment(unsigned attch, const Texture *tex, const TexEnv *env)
  38 {
  39         if(attch>=TexUnit::get_n_units())
  40                 throw InvalidParameterValue("Invalid texture attachment");
  41
  42         if(attachments.size()<=attch)
  43                 attachments.resize(attch+1);
  44
  45         attachments[attch].tex = tex;
  46         attachments[attch].env = env;
  47
  48         if(current()==this)
  49                 bind_attachment(attch);
  50 }
  51
  52 void Texturing::bind_attachment(unsigned i) const
  53 {
  54         const Attachment &attch = attachments[i];
  55         TexUnit::activate(i);
  56         if(attch.tex)
  57                 attch.tex->bind();
  58         else
  59                 Texture::unbind();
  60         if(attch.env)
  61                 attch.env->bind();
  62         else
  63                 TexEnv::unbind();
  64 }
  65
  66 void Texturing::unbind_attachment(unsigned i)
  67 {
  68         TexUnit::activate(i);
  69         Texture::unbind();
  70         TexEnv::unbind();
  71 }
  72
  73 void Texturing::bind() const
  74 {
  75         const Texturing *old = current();
  76         if(set_current(this))
  77         {
  78                 for(unsigned i=0; i<attachments.size(); ++i)
  79                         bind_attachment(i);
  80                 if(old)
  81                 {
  82                         for(unsigned i=attachments.size(); i<old->attachments.size(); ++i)
  83                                 unbind_attachment(i);
  84                 }
  85         }
  86 }
  87
  88 void Texturing::unbind()
  89 {
  90         const Texturing *old = current();
  91         if(set_current(0))
  92         {
  93                 for(unsigned i=old->attachments.size(); i--;)
  94                         unbind_attachment(i);
  95         }
  96 }
  97
  98
  99 Texturing::Attachment::Attachment():
 100         tex(0),
 101         env(0)
 102 { }
 103
 104 } // namespace GL
 105 } // namespace Msp;