GteLighting.h

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// David Eberly, Geometric Tools, Redmond WA 98052
// Copyright (c) 1998-2017
// 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: 3.0.0 (2016/06/19)

#pragma once

#include <Mathematics/GteMatrix4x4.h>

namespace gte
{

struct GTE_IMPEXP Lighting
{
    // Construction.  The defaults are listed for each member.  The '*'
    // channels are not used but are included to match shader-constant
    // packing rules.
    Lighting();

    // (r,g,b,*): default (1,1,1,1)
    Vector4<float> ambient;

    // (r,g,b,*): default (1,1,1,1)
    Vector4<float> diffuse;

    // (r,g,b,*): default (1,1,1,1)
    Vector4<float> specular;

    // (angle,cosAngle,sinAngle,exponent): default (pi/2,0,1,1)
    Vector4<float> spotCutoff;

    // Attenuation is: intensity/(constant + linear * (d + quadratic * d)
    // where d is the distance from the light position to the vertex position.
    // The distance is in model space.  If the transformation from model space
    // to world space involves uniform scaling, you can include the scaling
    // factor in the 'intensity' component (by multiplication).
    //
    // (constant,linear,quadratic,intensity): default (1,0,0,1)
    Vector4<float> attenuation;
};

}