float4x4	matWVP				: register(c0);
float4		res					: register(c5);
float3		viewPos				: register(c4);
float3		lightDir			: register(c6);
float3x3	viewMatrixRotInv	: register(c7);
float4		projScaleOffsetInv	: register(c11);

struct vsOut
{
	float4 p : POSITION;
	float2 t : TEXCOORD0;
	float3 e : TEXCOORD1;
	float2 l : TEXCOORD2;
};

vsOut vs_main(float4 p : POSITION)
{
	vsOut o = { p, p.xy, p.xyw, (float2)0.f };
	o.p.xy += float2(-1.f, 1.f) * res.zw;
	o.t = o.t * float2(.5f, -.5f) + .5f;
	o.e.xy = o.e.xy * projScaleOffsetInv.xy + projScaleOffsetInv.zw;
	o.e = mul(o.e, viewMatrixRotInv);
	o.e.xy += float2(-1.f, 1.f) * res.zw;
	// Compute light position
	float4 lightPos = mul( float4(viewPos - lightDir, 1.0f), matWVP );
	o.l = clamp( lightPos.xy / abs(lightPos.w), -1.f, 1.f );
	o.l = o.l * float2(.5f, -.5f) + .5f;
	return o;
};