void display::define_light(const int & light_number, const math::transform & modelview, const math::vector & position,
const color & ambient, const color & diffuse, const color & specular,
const gsgl::real_t & attenuation_constant, const gsgl::real_t & attenuation_linear, const gsgl::real_t & attenuation_quadratic)
{
bind();
glMatrixMode(GL_MODELVIEW);
glLoadMatrixf(modelview.ptr());
int gl_light = GL_LIGHT0 + light_number;
glEnable(gl_light);
glLightfv(gl_light, GL_AMBIENT, ambient.ptr());
glLightfv(gl_light, GL_DIFFUSE, diffuse.ptr());
glLightfv(gl_light, GL_SPECULAR, specular.ptr());
glLightfv(gl_light, GL_POSITION, position.ptr());
glLightf(gl_light, GL_CONSTANT_ATTENUATION, attenuation_constant);
glLightf(gl_light, GL_LINEAR_ATTENUATION, attenuation_linear);
glLightf(gl_light, GL_QUADRATIC_ATTENUATION, attenuation_quadratic);
} // display::define_light()
void display::define_ambient_light(const color & ambient)
{
bind();
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient.ptr()); CHECK_GL_ERRORS();
} // display::define_ambient_light()