jaames

{
	"information_for_contributors": [
		"This file is based on https://github.com/shikijs/textmate-grammars-themes/blob/main/packages/tm-grammars/grammars/lua.json",
    		"With changes made to support Playdate-specific Lua additions such as extra table methods and assignment operators"
	],
	"version": "1",
	"name": "Lua",
	"scopeName": "source.lua",
	"patterns": [
		{

jaames

⚠️ This spec is not official, and was reverse engineered on 19th October 2024. It may become out of date in the future as Anishare develops.

Header

Files always begin with a 50-byte header.

Offset	Type	Details
0	char[8]	Magic ident "ANISHARE"
8	uint8	Version number (currently 0)

jaames

export const dist = (x1: number, y1: number, x2: number, y2: number) => Math.sqrt(Math.pow((x1 - x2), 2) + Math.pow((y1 - y2), 2));

export class LineSegment {
  x0: number = 0;
  y0: number = 0;
  x1: number = 0;
  y1: number = 0;

  constructor (x0: number, y0: number, x1: number, y1: number) {
    this.x0 = x0;

jaames

local CRC32_LUT = nil

local function crc32_init()
  if not CRC32_LUT then
    CRC32_LUT = table.create(255, 0)
    local rem
    for i = 0, 255 do
      rem = i
      for j = 1, 8 do
        if (rem & 1 == 1) then

jaames

Prism.languages.lua = {
	'comment': /^#!.+|--(?:\[(=*)\[[\s\S]*?\]\1\]|.*)/m,
	// \z may be used to skip the following space
	'string': {
		pattern: /(["'])(?:(?!\1)[^\\\r\n]|\\z(?:\r\n|\s)|\\(?:\r\n|[^z]))*\1|\[(=*)\[[\s\S]*?\]\2\]/,
		greedy: true
	},
	'number': /\b0x[a-f\d]+(?:\.[a-f\d]*)?(?:p[+-]?\d+)?\b|\b\d+(?:\.\B|(?:\.\d*)?(?:e[+-]?\d+)?\b)|\B\.\d+(?:e[+-]?\d+)?\b/i,
	'keyword': /\b(?:and|break|do|else|elseif|end|false|for|function|goto|if|in|local|nil|not|or|repeat|return|then|true|until|while)\b/,
	'function': /(?!\d)\w+(?=\s*(?:[({]))/,

jaames

import { unzlibSync } from 'fflate';

function assert(condition: boolean, errMsg: string = 'Assert failed'): asserts condition {
  if (!condition) {
    console.trace(errMsg);
    throw new Error(errMsg);
  }
}

function readChars(data: DataView, ptr: number, size?: number) {

jaames

// run in node.js, version 16.0 or later
// assumes sound effects will be in a folder called 'pda', located next to the script (replace all instances of './pda' to change this)

const fs = require('fs');

function assert(condition, errMsg = 'Assert failed') {
  if (!condition) {
    console.trace(errMsg);
    throw new Error(errMsg);
  }

jaames

com.panic.b360
com.tpmcosoft.battleship
com.a-m.beats-bleeps-boogie
com.radstronomical.CasualBirder
com.uvula.crankin
com.crookedpark.demonquest85
com.samanthazero.echoicmemory
com.davemakes.execgolf
com.serenityforge.elevator

jaames

General tips

• For repeated expensive drawing options, such as drawing a rotated sprite or a large amount of text, it's a good idea to cache the result to an image once and draw that repeatedly instead.
• Audio formats in order of decode speed, fastest to slowest: 16-bit pcm wav, 8-bit pcm wav, adpcm, mp3.
• The Playdate's audio sample rate is 44100, but if you're experiencing lag when playing audio at that rate, you can try halving the rate to 22050.

C tips

• The Playdate has a weak CPU but a comparatively generous amount of memory. Favour memory-based optimisation techniques, such as lookup tables.
• Where possible, move branch statements outside of loops, even if it means duplicating the code for the loop. (probably applies to Lua too?)
• If you need to parse a binary file, use playdate->file->seek to jump to the parts you need and playdate->file->read to only read the data you want. Try to avoid memcpy-ing the whole file to memory in one go.
• If you're blitting to the frame buffer and need to ap

jaames

-- bezier curve drawing functions for playdate lua
-- these are based on de Casteljau's algorithm
-- this site has a nice interactive demo to compare both types of curve: https://pomax.github.io/bezierinfo/#flattening

-- draws a curve starting at x1,y1, ending at x3,y3, with x2,y2 being a control point that "pulls" the curve towards it
-- steps is the number of line segments to use, lower is better for performance, higher makes your curve look smoother
-- the playdate is kinda slow, so it's recommended to find a relatively low step number that looks passable enough!
function drawQuadraticBezier(x1, y1, x2, y2, x3, y3, steps)
  steps = steps or 8
  local d = 1 / steps