#include "common.hlsli"

struct vv
{
    float3 pos0 : POSITION0;
    float3 pos1 : POSITION1;
    float3 n0 : NORMAL0;
    float3 n1 : NORMAL1;
    float2 tc0 : TEXCOORD0;
    float2 tc1 : TEXCOORD1;
    float4 rgbh0 : TEXCOORD2; // rgb.h
    float4 rgbh1 : TEXCOORD3; // rgb.h
    float4 sun_af : COLOR0; // x=sun_0, y=sun_1, z=alpha, w=factor
};

struct vf
{
    float4 hpos : POSITION;
    float3 Pe : TEXCOORD0;
    float2 tc0 : TEXCOORD1; // base0
    float2 tc1 : TEXCOORD2; // base1
    float4 af : COLOR1; // alpha&factor
};

#define L_SCALE (2.0h * 1.55h)
vf main(vv I)
{
    vf o;

    // lerp pos
    float factor = I.sun_af.w;
    float4 pos = float4(lerp(I.pos0, I.pos1, factor), 1);

    float h = lerp(I.rgbh0.w, I.rgbh1.w, factor) * L_SCALE;

    o.hpos = mul(m_VP, pos); // xform, input in world coords
    o.Pe = mul(m_V, pos);

    // replicate TCs
    o.tc0 = I.tc0;
    o.tc1 = I.tc1;

    // calc normal & lighting
    o.af = float4(h, h, I.sun_af.z, factor);
    return o;
}
FXVS;