Egor Dorichev egordorichev

This information applies to the PICO-8 0.1.6 release.

This document is here to help folks with a proficiency in Lua understand the limitations and discrepencies between Lua and PICO-8's Lua.

General

anything written in uppercase the PICO-8 editor or .p8 is made lowercase by the editor. → editing the .p8 file directly can work
print(function() end) outputs the string function instead of the string function: 0x0000000.

Here I'm trying to understand what happens when I run

./hello

#include

	Screen resolutions
	------------------

	PICO-8 supports different undocumented videomodes that can be activated at runtime,
	using poke(0x5F2C, X) where X is one of the following mode numbers:

	0: 128x128, 0 pages
	1: 64x128, 1 page
	2: 128x64, 1 page
	3: 64x64, 3 pages

	--[[ json.lua

	A compact pure-Lua JSON library.
	The main functions are: json.stringify, json.parse.

	## json.stringify:

	This expects the following to be true of any tables being encoded:
	* They only have string or number keys. Number keys must be represented as
	strings in json; this is part of the json spec.

	import java.util.Arrays;
	import java.util.List;
	import java.util.function.BinaryOperator;

	public class Duplication {
	public static void main(String[] args) {
	List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
	Integer product = Math2.sum(numbers);
	System.out.println(product);
	}

	/*-----------------------------------------------------------.
	/ ColorBlind correction /
	'-----------------------------------------------------------*/
	// Daltonize (source http://www.daltonize.org/search/label/Daltonize)
	// Modified to simulate color blindness.
	float4 Daltonize( float4 input, float2 tex )
	{
	// RGB to LMS matrix conversion
	float3 L = (17.8824f * input.r) + (43.5161f * input.g) + (4.11935f * input.b);
	float3 M = (3.45565f * input.r) + (27.1554f * input.g) + (3.86714f * input.b);

	// Reference: http://stackoverflow.com/questions/4822471/count-number-of-lines-in-a-git-repository

	$ git ls-files \| xargs wc -l

	struct Textures {
	static GLuint LoadPNG(const std::string& filename) {

	if( ! FileExists(filename)) {
	Exit("Cannot open png: %s.", filename.c_str());
	}

	FILE* fp = ::fopen(filename.c_str(), "r");

	png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);

	/*
	2D Angle Interpolation (shortest distance)

	Parameters:
	a0 = start angle
	a1 = end angle
	t = interpolation factor (0.0=start, 1.0=end)

	Benefits:
	1. Angles do NOT need to be normalized.