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[HLSL] How to do AND or OR?

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As in the title. I want some code to be processed only if macro 1 OR macro 2 is defined. I try:

#ifdef MACRO1 || MACRO2

but that doesn't work. Any hint? :)

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Use #if instead, and define those values with a value of 1 (or 0 if you want them to be disabled). If the macro isn't defined, it will come through as a value of 0.

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