/* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 * Copyright (c) 2004-2013  HUBzero Foundation, LLC
 *
 * Authors:
 *   Wei Qiao <qiaow@purdue.edu>
 */

#include "common.cg"
 
v2f main(a2v IN,
         uniform float4x4 modelViewProjMatrix,
         uniform float4x4 modelViewInv,
         uniform float4 light0Position,
         uniform float4 objPlaneS,
         uniform float4 objPlaneT,
         uniform float4 objPlaneR)
{
    v2f OUT;

    // IN.Position is in eye coords
    float4 objPos = mul(modelViewInv, IN.Position);
    float4 eyePosObjSpace = mul(modelViewInv, float4(0,0,0,1));

    // Clip space vertex position
    OUT.HPosition = mul(modelViewProjMatrix, objPos);

    // Generate world space texture coordinates
    OUT.TexCoord.x = dot(objPos, objPlaneS);
    OUT.TexCoord.y = dot(objPos, objPlaneT);
    OUT.TexCoord.z = dot(objPos, objPlaneR);

    // World space eye position
    OUT.EyeVector = normalize(eyePosObjSpace - objPos);

    // World space light postion (light0Position is in eye coords)
    OUT.Light = normalize(mul(modelViewInv, light0Position)-objPos);

    return OUT;
}