struct vIn {
	float4 color    : DIFFUSE;
	float4 position : POSITION;
};

struct vOut {
	float4 col : COLOR;
	float4 pos : POSITION;
};

vOut main(
	vIn              input,
	uniform float4x4 mvp,
	uniform float4 vp_scale,
	uniform float4 vp_offset
	)
{
	vOut   result;
	float4 position;

	position = float4(input.position.xyz, 1.0f);
	position = mul(position, mvp);
	position.xyz = position.xyz / position.w;
	
	position.x = position.x * vp_scale.x + vp_offset.x;
	position.y = position.y * vp_scale.y + vp_offset.y;
	position.z = position.z * vp_scale.z + vp_offset.z;
	//position.w =  1.0 / half_viewport.w;
	
	result.pos = position;
	result.col = input.color;
	return result;
}