Fixed-point conformance. Draws a column of known 16.16 PICO-8-semantics results; read the numbers against the comments to confirm the shared luacretro math core is correct (floor division, modulo, sqrt, turns-based screen-inverted sin/cos).
function _init()
cls(0)
print("mathcheck", 50, 8, 7)
print(flr(7 / 2), 20, 30, 1) -- 3
print(flr(-9 / 2), 20, 42, 1) -- -5 (floor, not truncation)
print(7 % 3, 20, 54, 1) -- 1
print(flr(sqrt(49)), 20, 66, 1) -- 7
print(flr(sin(0) * 100), 20, 84, 3) -- 0
print(flr(sin(0.25) * 100), 20, 96, 3) -- -100 (P8 inverted sin)
print(flr(cos(0) * 100), 20, 108, 3) -- 100
print(flr(1.5 * 4), 20, 126, 10) -- 6
end
function _draw() end
Every value matches its comment — the fixed-point core is byte-goldened across the whole luacretro family and verified on real C64 hardware here.