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/*  Visualization Library                                                             */
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#ifndef Light_INCLUDE_ONCE
#define Light_INCLUDE_ONCE

#include <vlGraphics/link_config.hpp>
#include <vlCore/Vector4.hpp>
#include <vlCore/Transform.hpp>
#include <vlGraphics/RenderState.hpp>

namespace vl
{
  //------------------------------------------------------------------------------
  // Light
  //------------------------------------------------------------------------------
  class VLGRAPHICS_EXPORT Light: public RenderStateIndexed
  {
    VL_INSTRUMENT_CLASS(vl::Light, RenderStateIndexed)

  public:
    Light();

    virtual ERenderState type() const { return RS_Light; }

    virtual void apply(int index, const Camera*, OpenGLContext* ctx) const;

    void setAmbient(const fvec4& ambientcolor) { mAmbient = ambientcolor; }
    const fvec4& ambient() const { return mAmbient; }

    void setDiffuse(const fvec4& diffusecolor) { mDiffuse = diffusecolor; }
    const fvec4& diffuse() const { return mDiffuse; }

    void setSpecular(const fvec4& specularcolor) { mSpecular = specularcolor; }
    const fvec4& specular() const { return mSpecular; }

    void setPosition(const fvec4& position) { mPosition = position; }
    const fvec4& position() const { return mPosition; }

    void setSpotDirection(const fvec3& spotdirection) { mSpotDirection = spotdirection; }
    const fvec3& spotDirection() const { return mSpotDirection; }

    void setSpotExponent(float spotexponent) { mSpotExponent = spotexponent; }
    float spotExponent() const { return mSpotExponent; }

    void setSpotCutoff(float spotcutoff) { mSpotCutoff = spotcutoff; }
    float spotCutoff() const { return mSpotCutoff; }

    void setLinearAttenuation(float linearattenuation) { mLinearAttenuation = linearattenuation; }
    float linearAttenuation() const { return mLinearAttenuation; }

    void setQuadraticAttenuation(float quadraticattenuation) { mQuadraticAttenuation = quadraticattenuation; }
    float quadraticAttenuation() const { return mQuadraticAttenuation; }

    void setConstantAttenuation(float constantattenuation) { mConstantAttenuation = constantattenuation; }
    float constantAttenuation() const { return mConstantAttenuation; }

    void bindTransform(Transform* transform);

    Transform* boundTransform();

    const Transform* boundTransform() const;
    
    virtual ref<RenderState> clone() const
    {
      ref<Light> rs = new Light;
      *rs = *this;
      return rs;
    }

    void setEnabled(bool enabled) { mEnabled = enabled; }
    
    bool enabled() const { return mEnabled; }

  protected:
    fvec4 mAmbient;
    fvec4 mDiffuse;
    fvec4 mSpecular;
    fvec4 mPosition;
    fvec3 mSpotDirection;
    float mSpotExponent;
    float mSpotCutoff;
    float mConstantAttenuation;
    float mLinearAttenuation;
    float mQuadraticAttenuation;
    ref<Transform> mBoundTransform;
    bool mEnabled;
  };
}

#endif