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#include "glt_light.h"
/*! \file
\ingroup GLT
$Id: light.cpp,v 1.7 2002/10/09 15:09:38 nigels Exp $
$Log: light.cpp,v $
Revision 1.7 2002/10/09 15:09:38 nigels
Added RCS Id and Log tags
*/
#include <cstring>
#include <cassert>
#include <iostream>
using namespace std;
#include "glt_error.h"
// OpenGL Defaults
const GltColor GltLight::_ambientDefault (0,0,0,1);
const GltColor GltLight::_diffuseDefault (1,1,1,1);
const GltColor GltLight::_specularDefault (1,1,1,1);
const Vector GltLight::_positionDefault (0,0,1);
const Vector GltLight::_spotDirectionDefault(0,0,-1);
const GLfloat GltLight::_spotExponentDefault (0.0);
const GLfloat GltLight::_spotCutoffDefault (180.0);
const GLfloat GltLight::_attenuationConstantDefault(1);
const GLfloat GltLight::_attenuationLinearDefault(0);
const GLfloat GltLight::_attenuationQuadraticDefault(0);
GltLight::GltLight(const GLenum light,const bool getIt)
:
_light(light),
_isEnabled(false),
_ambient(_ambientDefault),
_diffuse(_diffuseDefault),
_specular(_specularDefault),
_position(_positionDefault),
_isDirectional(false),
_spotDirection(_spotDirectionDefault),
_spotExponent(_spotExponentDefault),
_spotCutoff(_spotCutoffDefault),
_attenuationConstant(_attenuationConstantDefault),
_attenuationLinear(_attenuationLinearDefault),
_attenuationQuadratic(_attenuationQuadraticDefault),
_inEyeSpace(false)
{
assert(_light>=GL_LIGHT0 && _light<=GL_LIGHT7);
if (getIt)
get();
}
GltLight::~GltLight()
{
}
void
GltLight::get()
{
assert(_light>=GL_LIGHT0 && _light<=GL_LIGHT7);
GLERROR(std::cerr);
_isEnabled = glIsEnabled(_light)!=0;
_ambient .glGetLight(_light,GL_AMBIENT);
_diffuse .glGetLight(_light,GL_DIFFUSE);
_specular.glGetLight(_light,GL_SPECULAR);
GltColor tmp;
tmp.glGetLight(_light,GL_POSITION); _position = tmp; _isDirectional = (tmp.alpha() == 0.0);
tmp.glGetLight(_light,GL_SPOT_DIRECTION); _spotDirection = tmp;
glGetLightfv(_light,GL_SPOT_EXPONENT ,&_spotExponent);
glGetLightfv(_light,GL_SPOT_CUTOFF ,&_spotCutoff);
glGetLightfv(_light,GL_CONSTANT_ATTENUATION ,&_attenuationConstant);
glGetLightfv(_light,GL_LINEAR_ATTENUATION ,&_attenuationLinear);
glGetLightfv(_light,GL_QUADRATIC_ATTENUATION,&_attenuationQuadratic);
GLERROR(std::cerr);
}
void
GltLight::set() const
{
assert(_light>=GL_LIGHT0 && _light<=GL_LIGHT7);
if (_isEnabled)
glEnable(_light);
else
glDisable(_light);
_ambient .glLight(_light,GL_AMBIENT);
_diffuse .glLight(_light,GL_DIFFUSE);
_specular.glLight(_light,GL_SPECULAR);
GltColor tmp;
tmp = _position; tmp.alpha() = _isDirectional ? 0.0 : 1.0; tmp.glLight(_light,GL_POSITION);
tmp = _spotDirection; tmp.glLight(_light,GL_SPOT_DIRECTION);
glLightf (_light,GL_SPOT_EXPONENT ,_spotExponent);
glLightf (_light,GL_SPOT_CUTOFF ,_spotCutoff);
glLightf (_light,GL_CONSTANT_ATTENUATION ,_attenuationConstant);
glLightf (_light,GL_LINEAR_ATTENUATION ,_attenuationLinear);
glLightf (_light,GL_QUADRATIC_ATTENUATION,_attenuationQuadratic);
}
GLenum &GltLight::light() { return _light; }
bool &GltLight::isEnabled() { return _isEnabled; }
GltColor &GltLight::ambient() { return _ambient; }
GltColor &GltLight::diffuse() { return _diffuse; }
GltColor &GltLight::specular() { return _specular; }
Vector &GltLight::position() { return _position; }
bool &GltLight::isDirectional() { return _isDirectional; }
Vector &GltLight::spotDirection() { return _spotDirection; }
GLfloat &GltLight::spotExponent() { return _spotExponent; }
GLfloat &GltLight::spotCutoff() { return _spotCutoff; }
GLfloat &GltLight::attenutationConstant() { return _attenuationConstant; }
GLfloat &GltLight::attenutationLinear() { return _attenuationLinear; }
GLfloat &GltLight::attenutationQuadratic() { return _attenuationQuadratic; }
bool &GltLight::inEyeSpace() { return _inEyeSpace; }
const GLenum &GltLight::light() const { return _light; }
const bool &GltLight::isEnabled() const { return _isEnabled; }
const GltColor &GltLight::ambient() const { return _ambient; }
const GltColor &GltLight::diffuse() const { return _diffuse; }
const GltColor &GltLight::specular() const { return _specular; }
const Vector &GltLight::position() const { return _position; }
const bool &GltLight::isDirectional() const { return _isDirectional; }
const Vector &GltLight::spotDirection() const { return _spotDirection; }
const GLfloat &GltLight::spotExponent() const { return _spotExponent; }
const GLfloat &GltLight::spotCutoff() const { return _spotCutoff; }
const GLfloat &GltLight::attenutationConstant() const { return _attenuationConstant; }
const GLfloat &GltLight::attenutationLinear() const { return _attenuationLinear; }
const GLfloat &GltLight::attenutationQuadratic() const { return _attenuationQuadratic; }
const bool &GltLight::inEyeSpace() const { return _inEyeSpace; }
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