source/lighting.cpp

   1 #include <stdexcept>
   2 #include "light.h"
   3 #include "lighting.h"
   4 #include "lightunit.h"
   5 #include "misc.h"
   6
   7 using namespace std;
   8
   9 namespace Msp {
  10 namespace GL {
  11
  12 Lighting::Lighting():
  13         ambient(0.2)
  14 { }
  15
  16 void Lighting::set_ambient(const Color &a)
  17 {
  18         ambient = a;
  19 }
  20
  21 void Lighting::attach(unsigned i, const Light &l)
  22 {
  23         if(i>=LightUnit::get_n_units())
  24                 throw out_of_range("Lighting::attach");
  25
  26         if(i>=lights.size())
  27                 lights.resize(i+1);
  28
  29         lights[i] = &l;
  30         if(current()==this)
  31                 l.bind_to(i);
  32 }
  33
  34 void Lighting::detach(unsigned i)
  35 {
  36         if(i>=lights.size())
  37                 return;
  38
  39         lights[i] = 0;
  40         if(current()==this)
  41                 Light::unbind_from(i);
  42 }
  43
  44 void Lighting::update_shader_data(ProgramData &shdata, const Matrix &view_matrix) const
  45 {
  46         shdata.uniform("ambient_color", ambient);
  47         for(unsigned i=0; i<lights.size(); ++i)
  48                 if(lights[i])
  49                         lights[i]->update_shader_data(shdata, view_matrix, i);
  50 }
  51
  52 void Lighting::bind() const
  53 {
  54         if(!set_current(this))
  55                 return;
  56
  57         enable(GL_LIGHTING);
  58         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, &ambient.r);
  59         for(unsigned i=0; i<lights.size(); ++i)
  60                 if(lights[i])
  61                         lights[i]->bind_to(i);
  62 }
  63
  64 void Lighting::unbind()
  65 {
  66         const Lighting *old = current();
  67         if(!set_current(0))
  68                 return;
  69
  70         for(unsigned i=0; i<old->lights.size(); ++i)
  71                 if(old->lights[i])
  72                         Light::unbind_from(i);
  73
  74         disable(GL_LIGHTING);
  75 }
  76
  77 } // namespace GL
  78 } // namespace Msp