HLSL #pragma once equivalent?

Question

What's the equivalent to C/C++-like #pragma once in HLSL includes?

I want (as a contrived example):

// ./dependency.hlsl
float x() { return 0; }

// ./shader.hlsl
#include "./dependency.hlsl" // (./ unnecessary; for question readability)
#include "./dependency.hlsl"

to not fail with error X3003: redefinition of 'x'. #pragma once at the top of my file yields a non-error warning X3568: 'once' : unknown pragma ignored and does nothing!

"hlsl" "include guard" brings up only 135 results on google, none of which are relevant and "hlsl" "pragma once" brings up C++ stuff. Hopefully the Google gods catch this. Also, not sure if there's a better approach (I'm fairly newbie) so maybe my provided answer is nonoptimal. — Warty, Dec 26 '17 at 12:00

score 9 · Accepted Answer · answered Dec 26 '17 at 11:59

9

Use C/C++ macro-like include guards. The contrived dependency.hlsl would look as follows:

#ifndef __DEPENDENCY_HLSL__
#define __DEPENDENCY_HLSL__

float x() { return 0; }

#endif // __DEPENDENCY_HLSL__

answered Dec 26 '17 at 11:59

Warty

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HLSL #pragma once equivalent?

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