source/light.cpp

   1 #include <stdexcept>
   2 #include <msp/gl/extensions/msp_legacy_features.h>
   3 #include <msp/strings/format.h>
   4 #include "light.h"
   5 #include "lightunit.h"
   6 #include "matrix.h"
   7 #include "misc.h"
   8 #include "programdata.h"
   9
  10 using namespace std;
  11
  12 namespace Msp {
  13 namespace GL {
  14
  15 Light::Light():
  16         diffuse(1),
  17         specular(1),
  18         position(0, 0, 1, 0),
  19         spot_dir(0, 0, -1),
  20         spot_exp(0),
  21         spot_cutoff(180)
  22 {
  23         attenuation[0] = 1;
  24         attenuation[1] = 0;
  25         attenuation[2] = 0;
  26 }
  27
  28 Light::~Light()
  29 {
  30         while(LightUnit *unit = LightUnit::find_unit(this))
  31                 unbind_from(unit->get_index());
  32 }
  33
  34 void Light::update_parameter(int mask, int index) const
  35 {
  36         if(index<0)
  37         {
  38                 LightUnit *unit = LightUnit::find_unit(this);
  39                 if(!unit)
  40                         return;
  41
  42                 index = unit->get_index();
  43         }
  44
  45         GLenum l = GL_LIGHT0+index;
  46         if(mask&DIFFUSE)
  47                 glLightfv(l, GL_DIFFUSE, &diffuse.r);
  48         if(mask&SPECULAR)
  49                 glLightfv(l, GL_SPECULAR, &specular.r);
  50         if(mask&POSITION)
  51                 glLightfv(l, GL_POSITION, &position.x);
  52         if(mask&SPOT_DIR)
  53                 glLightfv(l, GL_SPOT_DIRECTION, &spot_dir.x);
  54         if(mask&SPOT_EXP)
  55                 glLightf(l, GL_SPOT_EXPONENT, spot_exp);
  56         if(mask&SPOT_CUTOFF)
  57                 glLightf(l, GL_SPOT_CUTOFF, spot_cutoff);
  58         if(mask&ATTENUATION)
  59         {
  60                 glLightf(l, GL_CONSTANT_ATTENUATION, attenuation[0]);
  61                 glLightf(l, GL_LINEAR_ATTENUATION, attenuation[1]);
  62                 glLightf(l, GL_QUADRATIC_ATTENUATION, attenuation[2]);
  63         }
  64 }
  65
  66 void Light::set_diffuse(const Color &c)
  67 {
  68         diffuse = c;
  69         update_parameter(DIFFUSE);
  70 }
  71
  72 void Light::set_specular(const Color &c)
  73 {
  74         specular = c;
  75         update_parameter(SPECULAR);
  76 }
  77
  78 void Light::set_position(const Vector4 &p)
  79 {
  80         position = p;
  81         update_parameter(POSITION);
  82 }
  83
  84 void Light::set_spot_direction(const Vector3 &d)
  85 {
  86         spot_dir = d;
  87         update_parameter(SPOT_DIR);
  88 }
  89
  90 void Light::set_spot_exponent(float e)
  91 {
  92         spot_exp = e;
  93         update_parameter(SPOT_EXP);
  94 }
  95
  96 void Light::set_spot_cutoff(float c)
  97 {
  98         spot_cutoff = c;
  99         update_parameter(SPOT_CUTOFF);
 100 }
 101
 102 void Light::set_attenuation(float c, float l, float q)
 103 {
 104         attenuation[0] = c;
 105         attenuation[1] = l;
 106         attenuation[2] = q;
 107         update_parameter(ATTENUATION);
 108 }
 109
 110 void Light::update_shader_data(ProgramData &shdata, const Matrix &view_matrix, unsigned i) const
 111 {
 112         string base = format("light_sources[%d]", i);
 113         shdata.uniform(base+".position", view_matrix*position);
 114         shdata.uniform(base+".diffuse", diffuse);
 115         shdata.uniform(base+".specular", specular);
 116 }
 117
 118 void Light::bind_to(unsigned i) const
 119 {
 120         static Require _req(MSP_legacy_features);
 121
 122         LightUnit &unit = LightUnit::get_unit(i);
 123         if(unit.set_light(this))
 124         {
 125                 enable(GL_LIGHT0+unit.get_index());
 126                 update_parameter(-1, unit.get_index());
 127         }
 128 }
 129
 130 const Light *Light::current(unsigned i)
 131 {
 132         return LightUnit::get_unit(i).get_light();
 133 }
 134
 135 void Light::unbind_from(unsigned i)
 136 {
 137         LightUnit &unit = LightUnit::get_unit(i);
 138         if(unit.set_light(0))
 139                 disable(GL_LIGHT0+unit.get_index());
 140 }
 141
 142 } // namespace GL
 143 } // namespace Msp