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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.1 (2010/10/01)
#ifndef WM5LIGHT_H
#define WM5LIGHT_H
#include "Wm5GraphicsLIB.h"
#include "Wm5Object.h"
#include "Wm5Float4.h"
#include "Wm5APoint.h"
namespace Wm5
{
class WM5_GRAPHICS_ITEM Light : public Object
{
WM5_DECLARE_RTTI;
WM5_DECLARE_NAMES;
WM5_DECLARE_STREAM(Light);
public:
enum WM5_GRAPHICS_ITEM Type
{
LT_AMBIENT,
LT_DIRECTIONAL,
LT_POINT,
LT_SPOT,
LT_QUANTITY
};
// Construction and destruction.
Light (Type eType = LT_AMBIENT);
virtual ~Light ();
// The light type, currently only one of the classic types. The default
// value is LT_AMBIENT.
inline void SetType (Type type);
inline Type GetType () const;
// The colors of the light.
Float4 Ambient; // default: (0,0,0,1)
Float4 Diffuse; // default: (0,0,0,1)
Float4 Specular; // default: (0,0,0,1)
// Attenuation is typically specified as a modulator
// m = 1/(C + L*d + Q*d*d)
// where C is the constant coefficient, L is the linear coefficient,
// Q is the quadratic coefficient, and d is the distance from the light
// position to the vertex position. To allow for a linear adjustment of
// intensity, the choice is to use instead
// m = I/(C + L*d + Q*d*d)
// where I is an intensity factor.
float Constant; // default: 1
float Linear; // default: 0
float Quadratic; // default: 0
float Intensity; // default: 1
// Parameters for spot lights. The cone angle must be in radians and
// should satisfy 0 < Angle <= pi.
float Angle; // default: pi
float CosAngle; // default: -1
float SinAngle; // default: 0
float Exponent; // default: 1
// A helper function that lets you set mAngle and have mCosAngle and
// mSinAngle computed for you.
void SetAngle (float angle);
// Although the standard directional and spot lights need only a direction
// vector, to allow for new types of derived-class lights that would use
// a full coordinate frame, Light provides storage for such a frame. The
// light frame is always in world coordinates.
// default position P = (0,0,0)
// default direction D = (0,0,-1)
// default up U = (0,1,0)
// default right R = (1,0,0)
// The set {D,U,R} must be a right-handed orthonormal set. That is, each
// vector is unit length, the vectors are mutually perpendicular, and
// R = Cross(D,U).
APoint Position;
AVector DVector;
AVector UVector;
AVector RVector;
// A helper function that lets you set the direction vector and computes
// the up and right vectors automatically.
void SetDirection (const AVector& direction);
protected:
Type mType;
};
WM5_REGISTER_STREAM(Light);
typedef Pointer0<Light> LightPtr;
#include "Wm5Light.inl"
}
#endif
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