An unqualified float uniform takes each stage's default precision, and
those differ -- highp in the vertex stage, mediump in the fragment one.
LOVE 11 linked the pair regardless; LOVE 12 requires both declarations to
carry the same qualifier and refuses the shader:
Cannot compile shader: ERROR: Linking fragment stage: Precision
qualifiers must match: vertex stage: fireflyNight "" fragment stage:
fireflyNight ""
Voxel3D.available() is 'the scene shader compiled', so the refusal takes
the whole 3D pass with it and the overworld silently falls back to flat
2D. That is the current state on iOS, whose shell ships LOVE 12, and it
is latent for every other platform that moves to 12.
Uses LOVE_HIGHP_OR_MEDIUMP, the same macro vWorld and vGrid already carry.
luisgonzaleznf
2a924ea8a3