#include "Maya_lightView_vertex.cg"

struct vert2frag
{
    float4 position           : POSITION;
	// texunit 0 is assigned to projective light texture; texcoords are generated automatically.
    float3 color              : COLOR0;
    float2 uvCoord1           : TEXCOORD1;

#ifdef IS_SPECULAR
    float3 tEyeDir            : TEXCOORD2;
	// texunit 3 is assigned to N.H^k texture.
#else
	// Transparency/opacity uvs
	float2 uvCoord3			  : TEXCOORD3;
#endif // IS_SPECULAR

    float3 tLightDir          : TEXCOORD4;
    float2 uvCoord2           : TEXCOORD5;
};

// define inputs from application
struct app2vert
{
    float4 position           : POSITION;
    float3 normal             : NORMAL;
    float3 tangent            : TEXCOORD0;
    float4 texcoord1          : TEXCOORD1;
    float4 texcoord2          : TEXCOORD5;

#ifndef IS_SPECULAR
	// Transparency/opacity uvs
    float4 texcoord3          : TEXCOORD3;
#endif // IS_SPECULAR

};

vert2frag main(app2vert IN, 
               uniform float4x4 modelViewProj : _GL_MVP,
               uniform float4 lightColor,
#ifdef IS_DIRECTIONAL_LIGHT
               uniform float3 lightDirObj,
#else
               uniform float4 lightPosObj,
#endif
               uniform float4x4 tex1ProjMatrix,
               uniform float4x4 tex2ProjMatrix,
#ifndef IS_SPECULAR
			   // transparency/opacity 
               uniform float4x4 tex3ProjMatrix,
#endif // IS_SPECULAR

               uniform float4 cameraPosObj )
{
    vert2frag OUT;


    float3 lightDirTang;
#ifdef IS_SPECULAR
    float3 eyeVectorTang;
    computeLightViewVectors(
        IN.position,
        IN.normal,
        IN.tangent,
        cameraPosObj,
#ifdef IS_DIRECTIONAL_LIGHT
        lightDirObj,
#else
        lightPosObj,
#endif
        lightDirTang,
        eyeVectorTang);
#else
    computeLightVector(
        IN.position,
        IN.normal,
        IN.tangent,
#ifdef IS_DIRECTIONAL_LIGHT
        lightDirObj,
#else
        lightPosObj,
#endif
        lightDirTang);
#endif

    OUT.position = mul(modelViewProj, IN.position);
    OUT.color = lightColor;
    OUT.uvCoord1 = mul(tex1ProjMatrix, IN.texcoord1);
#ifdef IS_SPECULAR
    OUT.tEyeDir = eyeVectorTang;
#else
	// Transform the transparency/opacity uvs.
	OUT.uvCoord3 = mul(tex3ProjMatrix, IN.texcoord3);
#endif
    OUT.tLightDir = lightDirTang;
    OUT.uvCoord2 = mul(tex2ProjMatrix, IN.texcoord2);


    return OUT;
}