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ReC98/th03/main/collmap.inc

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[Reverse-engineering] [th03] Collision bitmap: Variables and constants Oh wow, it's exactly how I always naively imagined collision detection to be implemented in a fixed-resolution 2D bullet hell game with small hitboxes. Part of P0182, funded by Lmocinemod and [Anonymous].
2022-02-04 14:22:58 +00:00
COLLMAP_TILE_W = 2
COLLMAP_TILE_H = 2
COLLMAP_TILE_W_BITS = 1
COLLMAP_TILE_H_BITS = 1
COLLMAP_MEMORY_W = ((PLAYFIELD_W / COLLMAP_TILE_W) / 8)
COLLMAP_H = (PLAYFIELD_H / COLLMAP_TILE_H)
COLLMAP_SIZE = COLLMAP_MEMORY_W * COLLMAP_H
[Reverse-engineering] [th03] Collision bitmap: Drawing slopes (undecompilable) Reason: Self-modifying. -.- Only used in Chiyuri's EX Attack (the one with the diagonal lasers). Part of P0182, funded by Lmocinemod and [Anonymous].
2022-02-06 16:24:09 +00:00
[Reverse-engineering] [th03] Collision bitmap: Rectangles (undecompilable) Reason: Self-modifying. -.- The main shape used for drawing into this bitmap. "Stripes" would have been a better name, with only the top 2 (screen) / 1 (VRAM) out of every 8 (screen) / 4 (VRAM) pixels inside these rectangles being actually set as collidable inside this bitmap. If a player's hitbox happens to be smaller than 8 (screen) / 4 (VRAM) pixels, this would mean that a player could dodge right through two of these stripes. Same for the CPU, which would make it obvious how it could cheat. But are player hitboxes actually small enough for that to be possible? Gotta add another push to find out… (Also, wow, that's some ingenious bit twiddling right there… and it's all completely correct. 🤯 Whether all that complexity and especially all that register overloading would have been *necessary*, on the other hand…) Completes P0182, funded by Lmocinemod and [Anonymous].
2022-02-08 03:51:02 +00:00
COLLMAP_RECT_VSTRIPE_DISTANCE = 4
[Reverse-engineering] [th03] Collision bitmap: Drawing slopes (undecompilable) Reason: Self-modifying. -.- Only used in Chiyuri's EX Attack (the one with the diagonal lasers). Part of P0182, funded by Lmocinemod and [Anonymous].
2022-02-06 16:24:09 +00:00
COLLMAP_SLOPE_VSTRIPE_DISTANCE = 2