struct s_app2vert
{
    float4 position : POSITION;
    float4 normal   : NORMAL;
    float4 diffuse  : COLOR0;
};

struct s_vert2frag
{
    float4 hPos     : POSITION;
    float4 color    : COLOR0;
    float4 texcoord : TEXCOORD0;
};

s_vert2frag main(s_app2vert IN,
    uniform float3 Light,
    uniform float4x4 ModelViewIT,
    uniform float4x4 ModelView,
    uniform float4x4 ModelViewProj,
    uniform float4x4 Projection)
{
    float3 pos = mul(ModelView, IN.Position).xyz;
    float3 light = normalize(pos - light);

    float3 origin = {0.0, 0.0, 0.0};
    float3 light2Origin = normalize(origin - Light);
    float3 tmpUpVec = {0.0, 1.0, 0.0};
    float3 rightVec = normalize(cross(light2Origin, tmpUpVec));
    float3 upVec = normalize(cross(light2Origin, rightVec));

    s_vert2frag OUT;
    OUT.color = IN.Diffuse;
    OUT.texcoord[3] = 1.0;
    OUT.texcoord[0] = 0.5*dot(rightVec, light)+0.5;
    OUT.texcoord[1] = 0.5*dot(upVec, light)+0.5;
    OUT.hpos = mul(ModelViewProj, IN.Position);
    return OUT;
}