The float params were pinned to mediump to match LOVE 11's forward
declaration of effect(), because a definition whose precisions differ
from the prototype's reads as a second function to some compilers. LOVE
12 declares it under a different precision, so the pin became the
mismatch there and the shader stopped compiling -- lakes drew flat on
any LOVE 12 + Metal build, iOS included.
The qualifier is a define now, and Water.shader compiles the pinned form
first and the bare one only if that is refused, so whichever prototype a
runtime brought, one of the two agrees with it. The warning fires only
when both are refused.
DramaticShape
luisgonzaleznf