Xeeynamo/sotn-decomp

Cite as: Xeeynamo/sotn-decomp
Original: https://github.com/Xeeynamo/sotn-decomp
Pinned: Xeeynamo/sotn-decomp @ 2be55ee17221ee306e330edf2df2d49d48ba47ae
Accessed: 2026-10-21
Licence: AGPL-3.0-or-later (the decompiled source); the game's assets aren't in the repo
Credit: Xeeynamo and the sotn-decomp contributors; see the contributor graph.
Notes: A matching decompilation: the README says the code "compiles byte-for-byte to the same binaries of the game". Its reference build is the USA PlayStation release, SLUS-00067; it also builds the European PSP release and the Saturn port. The player's movement is in src/dra (71830.c holds the PlayerStep functions). FIX(x) is x × 65536, so velocities are in 1/65536 px per frame (include/common.h).

Cited on

In Symphony of the Night a jump from the ground sets Alucard's upward speed to 4.875 px/frame, and his horizontal speed to 1.5 px/frame toward a held direction, or 0.	`src/dra/6E42C.c L151–167include/common.h L95`	Code
While Alucard rises faster than 1 px/frame in a jump, letting go of the jump button (Cross) sets his upward speed to 1 px/frame.	`src/dra/71830.c L575–585`	Code
Each jumping frame adds 0.171875 px/frame² to Alucard's vertical speed, a fifth of that while Cross is held near the top (between 0.125 px/frame up and 0.375 down), and caps a fall at 7 px/frame.	`src/dra/71830.c L591src/dra/6FDF8.c L17–44`	Code
In Symphony of the Night's jump a held direction sets Alucard's horizontal speed to 1.5 px/frame that way at once, turning him if needed, and every jumping frame first slows it by 1/16 px/frame toward 0, so a released d-pad fades the speed out; Castlevania's take-off fixes Simon's direction for the whole jump.	`src/dra/71830.c L579–603src/decelerate.h L3–15src/dra/6DF70.c L101–115`	Code