source/render/texturing.cpp

   1 #include <msp/core/hash.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 int Texturing::find_free_unit(const string &name_hint) const
  18 {
  19         unsigned max_unit = TexUnit::get_n_units();
  20         // Leave some space for effect textures
  21         max_unit -= min(max_unit/4, 8U);
  22         unsigned initial_unit = (name_hint.empty() ? 0 : hash32(name_hint)%max_unit);
  23         unsigned unit = initial_unit;
  24         while(get_attached_texture(unit) || get_attached_sampler(unit))
  25         {
  26                 unit = (unit+1)%max_unit;
  27                 if(unit==initial_unit)
  28                         return -1;
  29         }
  30
  31         return unit;
  32 }
  33
  34 void Texturing::attach(unsigned attch, const Texture &tex, const Sampler *samp)
  35 {
  36         set_attachment(attch, &tex, samp);
  37 }
  38
  39 void Texturing::attach(unsigned attch, const Sampler &samp)
  40 {
  41         set_attachment(attch, 0, &samp);
  42 }
  43
  44 void Texturing::detach(unsigned attch)
  45 {
  46         set_attachment(attch, 0, 0);
  47 }
  48
  49 void Texturing::set_attachment(unsigned unit, const Texture *tex, const Sampler *samp)
  50 {
  51         if(unit>=TexUnit::get_n_units())
  52                 throw out_of_range("Texturing::set_attachment");
  53
  54         if(tex || samp)
  55         {
  56                 vector<Attachment>::iterator i;
  57                 for(i=attachments.begin(); (i!=attachments.end() && i->unit<=unit); ++i)
  58                         if(i->unit==unit)
  59                         {
  60                                 i->texture = tex;
  61                                 i->sampler = samp;
  62                                 if(current()==this)
  63                                         bind_attachment(*i);
  64                                 return;
  65                         }
  66
  67                 attachments.insert(i, Attachment(unit, tex, samp));
  68                 if(current()==this)
  69                         tex->bind_to(unit);
  70         }
  71         else
  72         {
  73                 for(vector<Attachment>::iterator i=attachments.begin(); (i!=attachments.end() && i->unit<=unit); ++i)
  74                         if(i->unit==unit)
  75                         {
  76                                 attachments.erase(i);
  77                                 if(current()==this)
  78                                         unbind_attachment(unit);
  79                                 return;
  80                         }
  81         }
  82 }
  83
  84 const Texture *Texturing::get_attached_texture(unsigned unit) const
  85 {
  86         for(vector<Attachment>::const_iterator i=attachments.begin(); (i!=attachments.end() && i->unit<=unit); ++i)
  87                 if(i->unit==unit)
  88                         return i->texture;
  89         return 0;
  90 }
  91
  92 const Sampler *Texturing::get_attached_sampler(unsigned unit) const
  93 {
  94         for(vector<Attachment>::const_iterator i=attachments.begin(); (i!=attachments.end() && i->unit<=unit); ++i)
  95                 if(i->unit==unit)
  96                         return i->sampler;
  97         return 0;
  98 }
  99
 100 void Texturing::bind() const
 101 {
 102         const Texturing *old = current();
 103         if(set_current(this))
 104         {
 105                 if(old)
 106                 {
 107                         vector<Attachment>::const_iterator i = attachments.begin();
 108                         vector<Attachment>::const_iterator j = old->attachments.begin();
 109                         while(i!=attachments.end() || j!=old->attachments.end())
 110                         {
 111                                 if(i!=attachments.end() && (j==old->attachments.end() || i->unit<=j->unit))
 112                                 {
 113                                         bind_attachment(*i);
 114                                         if(j!=old->attachments.end() && j->unit==i->unit)
 115                                                 ++j;
 116                                         ++i;
 117                                 }
 118                                 else
 119                                 {
 120                                         unbind_attachment(j->unit);
 121                                         ++j;
 122                                 }
 123                         }
 124                 }
 125                 else
 126                 {
 127                         for(vector<Attachment>::const_iterator i=attachments.begin(); i!=attachments.end(); ++i)
 128                                 bind_attachment(*i);
 129                 }
 130         }
 131 }
 132
 133 void Texturing::bind_attachment(const Attachment &attch) const
 134 {
 135         if(attch.sampler)
 136                 attch.sampler->bind_to(attch.unit);
 137         else
 138                 Sampler::unbind_from(attch.unit);
 139         attch.texture->bind_to(attch.unit);
 140 }
 141
 142 void Texturing::unbind()
 143 {
 144         const Texturing *old = current();
 145         if(set_current(0))
 146         {
 147                 for(vector<Attachment>::const_iterator i=old->attachments.begin(); i!=old->attachments.end(); ++i)
 148                         unbind_attachment(i->unit);
 149         }
 150 }
 151
 152 void Texturing::unbind_attachment(unsigned unit)
 153 {
 154         Texture::unbind_from(unit);
 155         Sampler::unbind_from(unit);
 156 }
 157
 158
 159 Texturing::Attachment::Attachment(unsigned u, const Texture *t, const Sampler *s):
 160         unit(u),
 161         texture(t),
 162         sampler(s)
 163 { }
 164
 165 } // namespace GL
 166 } // namespace Msp;