source/lighting.cpp

   1 #include <stdexcept>
   2 #include "light.h"
   3 #include "lighting.h"
   4 #include "lightunit.h"
   5 #include "matrix.h"
   6 #include "misc.h"
   7
   8 using namespace std;
   9
  10 namespace Msp {
  11 namespace GL {
  12
  13 Lighting::Lighting():
  14         ambient(0.2),
  15         sky_direction(0, 0, 1),
  16         horizon_angle(Geometry::Angle<float>::zero())
  17 { }
  18
  19 void Lighting::set_ambient(const Color &a)
  20 {
  21         ambient = a;
  22 }
  23
  24 void Lighting::set_sky_color(const Color &s)
  25 {
  26         sky_color = s;
  27 }
  28
  29 void Lighting::set_sky_direction(const Vector3 &d)
  30 {
  31         sky_direction = d;
  32 }
  33
  34 void Lighting::set_horizon_angle(const Geometry::Angle<float> &a)
  35 {
  36         horizon_angle = a;
  37 }
  38
  39 void Lighting::attach(unsigned i, const Light &l)
  40 {
  41         if(i>=LightUnit::get_n_units())
  42                 throw out_of_range("Lighting::attach");
  43
  44         if(i>=lights.size())
  45                 lights.resize(i+1);
  46
  47         lights[i] = &l;
  48         if(current()==this)
  49                 l.bind_to(i);
  50 }
  51
  52 void Lighting::detach(unsigned i)
  53 {
  54         if(i>=lights.size())
  55                 return;
  56
  57         lights[i] = 0;
  58         if(current()==this)
  59                 Light::unbind_from(i);
  60 }
  61
  62 void Lighting::update_shader_data(ProgramData &shdata, const Matrix &view_matrix) const
  63 {
  64         shdata.uniform("ambient_color", ambient);
  65         shdata.uniform("sky_color", sky_color);
  66         shdata.uniform("eye_sky_dir", Vector3(view_matrix*Vector4(sky_direction, 0.0f)));
  67         shdata.uniform("horizon_limit", horizon_angle.radians());
  68
  69         for(unsigned i=0; i<lights.size(); ++i)
  70                 if(lights[i])
  71                         lights[i]->update_shader_data(shdata, view_matrix, i);
  72 }
  73
  74 void Lighting::bind() const
  75 {
  76         if(!set_current(this))
  77                 return;
  78
  79         enable(GL_LIGHTING);
  80         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, &ambient.r);
  81         for(unsigned i=0; i<lights.size(); ++i)
  82                 if(lights[i])
  83                         lights[i]->bind_to(i);
  84 }
  85
  86 void Lighting::unbind()
  87 {
  88         const Lighting *old = current();
  89         if(!set_current(0))
  90                 return;
  91
  92         for(unsigned i=0; i<old->lights.size(); ++i)
  93                 if(old->lights[i])
  94                         Light::unbind_from(i);
  95
  96         disable(GL_LIGHTING);
  97 }
  98
  99 } // namespace GL
 100 } // namespace Msp