source/clipunit.cpp

   1 #include <msp/gl/extensions/msp_clipping.h>
   2 #include <stdexcept>
   3 #include "clipunit.h"
   4 #include "gl.h"
   5 #include "misc.h"
   6
   7 using namespace std;
   8
   9 namespace Msp {
  10 namespace GL {
  11
  12 vector<ClipUnit> ClipUnit::units;
  13
  14 ClipUnit::ClipUnit():
  15         index(0),
  16         plane(0)
  17 { }
  18
  19 bool ClipUnit::set_plane(const ClipPlane *p)
  20 {
  21         bool result = (p!=plane);
  22         plane = p;
  23         return result;
  24 }
  25
  26 unsigned ClipUnit::get_n_units()
  27 {
  28         static Require _req(MSP_clipping);
  29         static int count = get_i(GL_MAX_CLIP_PLANES);
  30         return count;
  31 }
  32
  33 ClipUnit &ClipUnit::get_unit(unsigned i)
  34 {
  35         if(i>=get_n_units())
  36                 throw out_of_range("ClipUnit::get_unit");
  37
  38         if(units.size()<=i)
  39         {
  40                 unsigned j = units.size();
  41                 units.resize(i+1, ClipUnit());
  42                 for(; j<units.size(); ++j)
  43                         units[j].index = j;
  44         }
  45
  46         return units[i];
  47 }
  48
  49 ClipUnit *ClipUnit::find_unit(const ClipPlane *p)
  50 {
  51         for(vector<ClipUnit>::iterator i=units.begin(); i!=units.end(); ++i)
  52                 if(i->plane==p)
  53                         return &*i;
  54         return 0;
  55 }
  56
  57 } // namespace GL
  58 } // namespace Msp