float4x4 matWVP : register(c0);
float4x4 matWorld : register(c12);
float4x4 matWorldI : register(c16);
float3	 viewPos : register(c4);
float3	 viewDir : register(c10);
float4	 res : register(c5);

struct vsIn
{
	float4 p : POSITION;
	float3 n : NORMAL;
	float4 c : COLOR;
	float2 t : TEXCOORD;
};

struct vsOut
{
	float4 p : POSITION;
	float4 c : COLOR0;
	float2 t : TEXCOORD0;
	float3 n : TEXCOORD1;
	float3 v : TEXCOORD2;
	float4 s : TEXCOORD3;
	float3 w : TEXCOORD4;
};

vsOut vs_main(vsIn i) 
{
	vsOut o;
	
	// Basic transformation of untransformed vertex into clip-space
	o.p= mul(i.p, matWVP);
 
	// No scaling or translation is done, simply assign them and let the GPU interpolate
	o.c = i.c;
	o.t = i.t;
	
	// Trasform to world space
	o.w= mul(i.p, matWorld).xyz;
	o.n= mul(i.n, transpose((float3x3)matWorldI));
	//OUT.normal = mul(matWorldIT, IN.normal);

	// Calculate the view vector
	o.v= viewPos - o.w;
	
	// (Pre-proj biased screen texcoords, unscaled z, w)
	o.s = o.p;
	o.s.xy = o.s.xy * float2(.5f, -.5f) + o.s.w * (.5f + .5f * res.zw);
	o.s.z = dot(o.w - viewPos, viewDir);
	
	return o;
};