SamplerState G_SamplerState[16] : register(s0);
Texture2D G_Texture2D[16] : register(t0);

struct sampler2D { int id; }

DECL_SAMPLER(Type, Name, Id) const Type Name = { Id };

#define tex2D(S, T) G_Texture2D[S.id].Sample(G_SamplerState[S.id], T.xy);