What does #pragma multi_compile_particles do?

Question

I've noticed this in pragma in Unity's default shaders for particles but can't find any documentation as to what it does.

     CGPROGRAM
     #pragma vertex vert
     #pragma fragment frag
     #pragma fragmentoption ARB_precision_hint_fastest
 
     #pragma multi_compile_particles
 
     #include "UnityCG.cginc"

Can anyone shed some light on what this does?

Answer 1

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Answer by Allingby · Mar 19, 2013 at 05:03 PM

multi_compile is for (As the name suggests) compiling multiple instances using a set of keywords, that you define. Looking at the compiled shader, the multi_compile_particles adds SOFTPARTICLES_ON and SOFTPARTICLES_OFF, so it's just Unity's own flavor of keywords for particles, containing that one. Additionally, you can toggle the keyword in quality settings.

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whydoidoit · Mar 19, 2013 at 05:09 PM 0

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Nice answer - very very old question :)

Allingby · Mar 19, 2013 at 05:20 PM 0

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Thanks, the present might appreciate it :O

PatHightree Allingby · Apr 10, 2016 at 10:39 PM 0

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2016 calling, we appreciate the answer too :)

What does #pragma multi_compile_particles do?

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