#include "common.h"
#include "shared\waterconfig.h"
#include "shared\watermove.h"

struct        v_vert
{
        float4         P        : POSITION;        // (float,float,float,1)
        float4        N        : NORMAL;        // (nx,ny,nz,hemi occlusion)
        float4         T        : TANGENT;
        float4         B        : BINORMAL;
        float4        color        : COLOR0;        // (r,g,b,dir-occlusion)
        float2         uv        : TEXCOORD0;        // (u0,v0)
};
struct   vf
{
        float4      hpos        :         POSITION        ;
        float2  	tbase        :           TEXCOORD0        ;  // base
        float2      tnorm0        :        TEXCOORD1        ;  // nm0
        float2      tnorm1        :        TEXCOORD2        ;  // nm1
        half3       M1        :        TEXCOORD3        ;
        half3       M2        :        TEXCOORD4        ;
        half3       M3        	:        TEXCOORD5        ;
        half3       v2point     :        TEXCOORD6        ;
#ifdef	USE_SOFT_WATER
#ifdef	NEED_SOFT_WATER
	float4      tctexgen    :         TEXCOORD7        ;
#endif	//	USE_SOFT_WATER
#endif	//	NEED_SOFT_WATER	
        half4        c0        :          COLOR0                ;
        float          fog        :         FOG                ;
};

vf main(v_vert v)
{
        vf                 o;

        float4         P         = v.P        ;                // world
        float3         NN         = unpack_normal        (v.N)        ;
                P         = watermove        (P)        ;

        o.v2point        = P-eye_position        ;
        o.tbase                = unpack_tc_base        (v.uv,v.T.w,v.B.w);                // copy tc
        o.tnorm0        = watermove_tc                 (o.tbase*W_DISTORT_BASE_TILE_0, P.xz, W_DISTORT_AMP_0);
        o.tnorm1        = watermove_tc                 (o.tbase*W_DISTORT_BASE_TILE_1, P.xz, W_DISTORT_AMP_1);


        // Calculate the 3x3 transform from tangent space to eye-space
        // TangentToEyeSpace = object2eye * tangent2object
        //                     = object2eye * transpose(object2tangent) (since the inverse of a rotation is its transpose)
        float3          N         = unpack_bx2(v.N);        // just scale (assume normal in the -.5f, .5f)
        float3          T         = unpack_bx2(v.T);        //
        float3          B         = unpack_bx2(v.B);        //
        float3x3 xform        = mul        ((float3x3)m_W, float3x3(
                                                T.x,B.x,N.x,
                                                T.y,B.y,N.y,
                                                T.z,B.z,N.z
                                ));
        // The pixel shader operates on the bump-map in [0..1] range
        // Remap this range in the matrix, anyway we are pixel-shader limited :)
        // ...... [ 2  0  0  0]
        // ...... [ 0  2  0  0]
        // ...... [ 0  0  2  0]
        // ...... [-1 -1 -1  1]
        // issue: strange, but it's slower :(
        // issue: interpolators? dp4? VS limited? black magic?

        // Feed this transform to pixel shader
        o.M1                 = xform        [0];
        o.M2                 = xform        [1];
        o.M3                 = xform        [2];

        float3         L_rgb         = v.color.xyz;                                                // precalculated RGB lighting
        float3         L_hemi         = v_hemi(N)*v.N.w;                                        // hemisphere
        float3         L_sun         = v_sun(N)*v.color.w;                                        // sun
        float3         L_final        = L_rgb + L_hemi + L_sun + L_ambient;
                // L_final        = v.N.w        + L_ambient;

        o.hpos                 = mul                        (m_VP, P);                        // xform, input in world coords
		o.fog       = saturate(calc_fogging  (v.P));

		o.c0		= float4		(L_final,o.fog);

//	Igor: for additional depth dest
#ifdef	USE_SOFT_WATER
#ifdef	NEED_SOFT_WATER
	o.tctexgen = mul( m_texgen, P);
	float3	Pe	= mul		(m_V,  P);
	o.tctexgen.z = Pe.z;
#endif	//	USE_SOFT_WATER
#endif	//	NEED_SOFT_WATER
        return o;
}