source/lighting.cpp

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