source/texture.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgl
   4 Copyright © 2007  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include "except.h"
   9 #include "texture.h"
  10 #include "texunit.h"
  11
  12 using namespace std;
  13
  14 namespace Msp {
  15 namespace GL {
  16
  17 istream &operator>>(istream &in, TextureFilter &tf)
  18 {
  19         string str;
  20         in>>str;
  21
  22         if(str=="NEAREST")
  23                 tf=NEAREST;
  24         else if(str=="LINEAR")
  25                 tf=LINEAR;
  26         else if(str=="NEAREST_MIPMAP_NEAREST")
  27                 tf=NEAREST_MIPMAP_NEAREST;
  28         else if(str=="NEAREST_MIPMAP_LINEAR")
  29                 tf=NEAREST_MIPMAP_LINEAR;
  30         else if(str=="LINEAR_MIPMAP_NEAREST")
  31                 tf=LINEAR_MIPMAP_NEAREST;
  32         else if(str=="LINEAR_MIPMAP_LINEAR")
  33                 tf=LINEAR_MIPMAP_LINEAR;
  34         else
  35                 in.setstate(ios_base::failbit);
  36
  37         return in;
  38 }
  39
  40
  41 void Texture::bind() const
  42 {
  43         if(!target)
  44                 throw InvalidState("Attempt to bind a texture without target");
  45
  46         const Texture *cur=TexUnit::current().get_texture();
  47         if(cur && cur->target!=target)
  48                 glDisable(cur->target);
  49         if(!cur || cur->target!=target)
  50                 glEnable(target);
  51         glBindTexture(target, id);
  52         TexUnit::current().set_texture(this);
  53 }
  54
  55 void Texture::parameter(GLenum param, int value)
  56 {
  57         maybe_bind();
  58
  59         glTexParameteri(target, param, value);
  60 }
  61
  62 void Texture::parameter(GLenum param, float value)
  63 {
  64         maybe_bind();
  65
  66         glTexParameterf(target, param, value);
  67 }
  68
  69 Texture::~Texture()
  70 {
  71         glDeleteTextures(1, &id);
  72 }
  73
  74 void Texture::unbind()
  75 {
  76         const Texture *cur=TexUnit::current().get_texture();
  77         if(!cur)
  78                 return;
  79
  80         glBindTexture(cur->target, 0);
  81         glDisable(cur->target);
  82         TexUnit::current().set_texture(0);
  83 }
  84
  85 Texture::Texture():
  86         target(0)
  87 {
  88         glGenTextures(1, &id);
  89 }
  90
  91 void Texture::maybe_bind() const
  92 {
  93         if(TexUnit::current().get_texture()!=this)
  94                 bind();
  95 }
  96
  97
  98 Texture::Loader::Loader(Texture &t):
  99         tex(t)
 100 {
 101         add("min_filter", &Loader::min_filter);
 102         add("mag_filter", &Loader::mag_filter);
 103         add("generate_mipmap", &Loader::generate_mipmap);
 104 }
 105
 106 void Texture::Loader::min_filter(TextureFilter f)
 107 {
 108         tex.set_min_filter(f);
 109 }
 110
 111 void Texture::Loader::mag_filter(TextureFilter f)
 112 {
 113         tex.set_mag_filter(f);
 114 }
 115
 116 void Texture::Loader::generate_mipmap(bool gm)
 117 {
 118         tex.parameter(GL_GENERATE_MIPMAP_SGIS, gm);
 119 }
 120
 121 } // namespace GL
 122 } // namespace Msp