#define IN_HLSL
#include "shdrConsts.h"

struct a2v 
{
	float4 texcoord        : TEXCOORD0;
	float2 lmCoord         : TEXCOORD1;
	float3 tangent         : TEXCOORD2;
	float3 binormal        : TEXCOORD3;
	float3 N               : TEXCOORD4;
	float3 normal          : NORMAL;
	float4 pos             : POSITION;
};

struct v2f
{
	float4 hpos     : POSITION;
	float3 eye      : TEXCOORD0;
	float3 light    : TEXCOORD1;
	float2 texcoord : TEXCOORD2;
	float2 lmcoord  : TEXCOORD3;
};

v2f main(a2v IN,
         uniform float4x4 modelview       : register(VC_WORLD_PROJ),
         uniform float4x4 texMat          : register(VC_TEX_TRANS1),
         uniform float3   lightdir        : register(VC_LIGHT_DIR1),
         uniform float3   eyePos          : register(VC_EYE_POS),
         uniform float4x4 objTrans        : register(VC_OBJ_TRANS))
{
	v2f OUT;

	// vertex position in clip space
	OUT.hpos=mul(modelview, IN.pos);

	// copy color and texture coordinates
	OUT.texcoord = mul(texMat, IN.texcoord);
	
	// tangent vectors in view space
	float3x3 tangentspace=float3x3(normalize(IN.tangent),normalize(IN.binormal),normalize(IN.normal));

    OUT.eye = mul( tangentspace, IN.pos.xyz - eyePos );
    
	OUT.light = mul( tangentspace, -lightdir );
	
	return OUT;
}