ProgramGamer [Lexaloffle Blog Feed]

Terminal doesn't reset cursor to be visible after escape is pressed

Tue, 29 Jul 2025 18:54:49 UTC

When a cart is loaded and run & then exited using escape, if that cart was capturing the mouse cursor or hiding it somehow, the terminal doesn't make it visible again, making it impossible to hold alt to click on a different workspace.

:matmul returns true when passed true, breaks chaining

Sat, 05 Jul 2025 16:34:36 UTC

Like the title says, the return value of :matmul, when passed true to indicate that the result should be stored in itself, is that same boolean value. This is inconvenient since it breaks method chaining. Here's a small repro as proof:

-- declare vector & metadata
local v = vec(1, 2, 3)
local m = userdata("f64", 3, 3)
m:set(0, 0,
	1, 0, 0,
	0, 1, 0,
	0, 0, 1
)

-- ok, should return userdata
? "return type 1: "..type(v:matmul(m))

-- ok, stores result in copy
local vcopy = v:copy()
? "return type 2: "..type(vcopy:matmul(m, vcopy))

-- prints boolean, breaks chaining
local vcopy = v:copy()
? "return type 3: "..type(vcopy:matmul(m, true))

[solved] tline3d doesn't use w0 and w1 correctly

Sun, 22 Jun 2025 01:53:15 UTC

While working on a DOOM style 3D game, I came across what I'm fairly confident now is a bug in how tline3d uses the w0 and w1 parameters. To illustrate the issue (and because explaining what's happening is fairly difficult, I'm not certain myself exactly what's happening) I've created a reproduction cart which also contains an implementation of what I would have expected tline3d to do.

niyimakoye

by ProgramGamer

[Click to Play]

Press Enter or Start to toggle between the builtin implementation and my own.

DOOM clone

Fri, 20 Jun 2025 23:49:13 UTC

DOOM clone (WIP)

Early WIP of a DOOM-like 3D game, which I've simply named "DOOM clone" for now.

doomclone

by ProgramGamer

[Click to Play]

Controls

Primary stick: Move
Secondary stick: Look (also mouse)
Left/Right Bumper: Cycle through video modes
P: Toggle CPU usage

Changelog

Revision 2 (July 9th 2025)

Added ability to draw models made of textured triangles.

Revision 1 (June 27th 2025)

Added floors and ceilings and a performance counter.

Initial release

Walls & basic movement are in, no collision yet.

Plans

I'm not sure what I want to do with this tech yet, but I knew the first step was to actually make a few functions that can draw the required 3D primitives. The engine can so far draw dots, bars, and walls in 3D space. The walls are perspective correct and get clipped by the near plane so there's no glitching when looking at walls from close up or at acute angles or anything. Primitives that are completely behind the camera even get culled.

The next step will most likely be to implement a sector system (like in DOOM proper) so that a BSP can be created.

Anyway, hope you enjoy what is ultimately a somewhat simple yet solid tech demo!

Multi-byte equivalents of memset, analogous to peek/poke variants

Mon, 26 May 2025 15:03:30 UTC

Maybe a bit of a niche feature request, but it would be nice if we had memset variants for blocks of values that take up multiple bytes, like how peek & poke now have variants for i16, i32, and i64 with peek2/poke2, peek4/poke4, and peek8/poke8 respectively. As it stands, initializing/filling a memory-mapped block of n values of anything other than bytes requires n instructions plus the cost of a for loop, so having the ability to reduce that to a single function call would be a great boon!