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!=this)
  48         {
  49                 if(cur && cur->target!=target)
  50                         glDisable(cur->target);
  51                 if(!cur || cur->target!=target)
  52                         glEnable(target);
  53                 glBindTexture(target, id);
  54                 TexUnit::current().set_texture(this);
  55         }
  56 }
  57
  58 void Texture::bind_to(unsigned i) const
  59 {
  60         TexUnit::activate(i);
  61         bind();
  62 }
  63
  64 void Texture::parameter(GLenum param, int value)
  65 {
  66         maybe_bind();
  67
  68         glTexParameteri(target, param, value);
  69 }
  70
  71 void Texture::parameter(GLenum param, float value)
  72 {
  73         maybe_bind();
  74
  75         glTexParameterf(target, param, value);
  76 }
  77
  78 Texture::~Texture()
  79 {
  80         glDeleteTextures(1, &id);
  81 }
  82
  83 void Texture::unbind()
  84 {
  85         const Texture *cur=TexUnit::current().get_texture();
  86         if(!cur)
  87                 return;
  88
  89         glBindTexture(cur->target, 0);
  90         glDisable(cur->target);
  91         TexUnit::current().set_texture(0);
  92 }
  93
  94 Texture::Texture():
  95         target(0)
  96 {
  97         glGenTextures(1, &id);
  98 }
  99
 100 void Texture::maybe_bind() const
 101 {
 102         if(TexUnit::current().get_texture()!=this)
 103                 bind();
 104 }
 105
 106
 107 Texture::Loader::Loader(Texture &t):
 108         tex(t)
 109 {
 110         add("min_filter", &Loader::min_filter);
 111         add("mag_filter", &Loader::mag_filter);
 112         add("generate_mipmap", &Loader::generate_mipmap);
 113 }
 114
 115 void Texture::Loader::min_filter(TextureFilter f)
 116 {
 117         tex.set_min_filter(f);
 118 }
 119
 120 void Texture::Loader::mag_filter(TextureFilter f)
 121 {
 122         tex.set_mag_filter(f);
 123 }
 124
 125 void Texture::Loader::generate_mipmap(bool gm)
 126 {
 127         tex.parameter(GL_GENERATE_MIPMAP_SGIS, gm);
 128 }
 129
 130 } // namespace GL
 131 } // namespace Msp