Fix map stuff, and implement builtin funcs for it

builtins.ts

@@ -8,11 +8,15 @@ import { keyDown, keyPressed, keyReleased } from "./keyboard.ts";
 import { addToContext, runCode } from "./runcode.ts";
 import { resetRepl } from "./repl.ts";
 import { COLOR } from "./colors.ts";
-import { getSheet, getCodeSheet } from "./sheet.ts";
+import { getSheet, getCodeSheet, getMapSheet } from "./sheet.ts";
 import { saveCart, loadCart } from "./cart.ts";
 
 let spritesheet: number | null = null;
 
+export const getSpritesheet = () => {
+	return spritesheet;
+}
+
 export const useSpritesheet = (sheet: number) => {
 	spritesheet = sheet;
 }
@@ -79,6 +83,37 @@ const faux = {
 	spr: drawSprite,
 	txt: drawText,
 	rect: fillRect,
+	map: (mapSheet: number, tileX: number, tileY: number, screenX: number, screenY: number, tileW: number, tileH: number) => {
+		const originalSpritesheet = getSpritesheet() ?? 0;
+		getMapSheet(mapSheet).forEach(([sprSheet, spr], i) => {
+			const x = i%64;
+			const y = Math.floor(i/64);
+			if (x >= tileX && y >= tileY && x < tileX + tileW && y < tileY + tileH) {
+				useSpritesheet(sprSheet);
+				drawSprite(screenX + (x-tileX)*8, screenY + (y-tileY)*8, spr);
+			}
+		});
+		useSpritesheet(originalSpritesheet);
+	},
+	// Map
+	mgetsht: (mapSheet: number, x: number, y: number) => {
+		if (x < 0 || x >= 64 || y < 0 || y >= 64) {
+			return undefined;
+		}
+		return getMapSheet(mapSheet)[y*64+x][0];
+	},
+	mgetspr: (mapSheet: number, x: number, y: number) => {
+		if (x < 0 || x >= 64 || y < 0 || y >= 64) {
+			return undefined;
+		}
+		return getMapSheet(mapSheet)[y*64+x][1];
+	},
+	mset: (mapSheet: number, x: number, y: number, sprSheet: number, spr: number) => {
+		if (x < 0 || x >= 64 || y < 0 || y >= 64) {
+			return;
+		}
+		getMapSheet(mapSheet)[y*64+x] = [sprSheet, spr];
+	},
 	// Input
 	btn: keyDown,
 	btnp: keyPressed,