This most recent round of development has been dedicated to squashing out bugs and investing in performance optimisations.
What’s particularly fun about NextBASIC is that it’s so close to the metal (as it were) - NextBASIC -> interpreter -> machine code - that it has a heavy hand in the code design that I work with.
A simple example is that in modern high level languages, I’d reduce my code reuse and refactor based on the rule that if a value or expression is used more than once, then it belongs in it’s own variable or routine.
Using that approach with NextBASIC comes at a cost, a cost that is immediately visible in the execution. Multiple routine calls slows down the runtime speed. Inlining code will always speed execution up (and this is also true of languages like JS).
A recent change is that I removed all the
CLS calls from my game. This clears the screen. But the ROM routine does a lot more than “just clearing the screen”.
Instead, now I’m writing bytes directly to the screen memory which has a near instant effect and there’s no longer a wipe-and-wait delay:
; bank 9-11 is the thirds of the screen memory in layer 2 ; bank 25 contains 1/3 of a screen header BANK 25 COPY TO 9 :; "Oh Mummy header" BANK 10 ERASE 252 :; Set the middle third to yellow BANK 11 ERASE %0,%$3000,252 :; REM 0-0x3000 as yellow BANK 11 ERASE %$3000,%$1000,0: ; last 4k is black
The bugs I’ve been squashing have been mostly been subtle issues that (hopefully) make the difference between “okay cool” and “oh, that’s odd”.
Here’s a fun bit of debugging to make sure the footsteps are positioned correctly:
The most recent fix I was most proud of is a control hack. If the player tries to move right, but there’s a wall in the way, it’ll continue moving in the direction they were previously facing until they’re free to move right. This hack means skimming around corners is much more natural - an invisible change to the player, but it felt sticky (or broken) when the player would be stuck hitting wall before a corner.
The outstanding tasks before the game is in a (first draft) complete state are:
- (required) Game over - Win state
- (required) Hi-score table
- (feat) Change colours of tombs between each level
- (feat) “Get outta there” / “now find the archaeologist” / “find that key!” marquee
Which doesn’t feel too far away!
Get Go Mummy! (ZX Spectrum Next)
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