source/lighting.cpp

   1 #include <stdexcept>
   2 #include <msp/gl/extensions/msp_legacy_features.h>
   3 #include "error.h"
   4 #include "light.h"
   5 #include "lighting.h"
   6 #include "lightunit.h"
   7 #include "matrix.h"
   8 #include "misc.h"
   9
  10 using namespace std;
  11
  12 namespace Msp {
  13 namespace GL {
  14
  15 Lighting::Lighting():
  16         ambient(0.2),
  17         sky_direction(0, 0, 1),
  18         horizon_angle(Geometry::Angle<float>::zero())
  19 { }
  20
  21 void Lighting::set_ambient(const Color &a)
  22 {
  23         ambient = a;
  24 }
  25
  26 void Lighting::set_sky_color(const Color &s)
  27 {
  28         sky_color = s;
  29 }
  30
  31 void Lighting::set_sky_direction(const Vector3 &d)
  32 {
  33         sky_direction = d;
  34 }
  35
  36 void Lighting::set_horizon_angle(const Geometry::Angle<float> &a)
  37 {
  38         horizon_angle = a;
  39 }
  40
  41 void Lighting::attach(unsigned i, const Light &l)
  42 {
  43         if(i>=lights.size())
  44                 lights.resize(i+1);
  45
  46         lights[i] = &l;
  47         if(current()==this)
  48                 l.bind_to(i);
  49 }
  50
  51 void Lighting::detach(unsigned i)
  52 {
  53         if(i>=lights.size())
  54                 return;
  55
  56         lights[i] = 0;
  57         if(current()==this)
  58                 Light::unbind_from(i);
  59 }
  60
  61 const Light *Lighting::get_attached_light(unsigned i) const
  62 {
  63         return i<lights.size() ? lights[i] : 0;
  64 }
  65
  66 void Lighting::update_shader_data(ProgramData &shdata, const Matrix &view_matrix) const
  67 {
  68         shdata.uniform("ambient_color", ambient);
  69         shdata.uniform("sky_color", sky_color);
  70         shdata.uniform("eye_sky_dir", view_matrix.block<3, 3>(0, 0)*sky_direction);
  71         shdata.uniform("horizon_limit", horizon_angle.radians());
  72
  73         for(unsigned i=0; i<lights.size(); ++i)
  74                 if(lights[i])
  75                         lights[i]->update_shader_data(shdata, view_matrix, i);
  76 }
  77
  78 void Lighting::bind() const
  79 {
  80         static Require _req(MSP_legacy_features);
  81         if(lights.size()>LightUnit::get_n_units())
  82                 throw invalid_operation("Lighting::bind");
  83
  84         if(!set_current(this))
  85                 return;
  86
  87         enable(GL_LIGHTING);
  88         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, &ambient.r);
  89         for(unsigned i=0; i<lights.size(); ++i)
  90                 if(lights[i])
  91                         lights[i]->bind_to(i);
  92 }
  93
  94 void Lighting::unbind()
  95 {
  96         const Lighting *old = current();
  97         if(!set_current(0))
  98                 return;
  99
 100         for(unsigned i=0; i<old->lights.size(); ++i)
 101                 if(old->lights[i])
 102                         Light::unbind_from(i);
 103
 104         disable(GL_LIGHTING);
 105 }
 106
 107 } // namespace GL
 108 } // namespace Msp