add ifl helpers

src/ifl.ts

@@ -0,0 +1,15 @@
+export function parseImageFrameList(source: string) {
+  const lines = source
+    .split(/(?:\r\n|\r|\n)/g)
+    .map((line) => line.trim())
+    .filter(Boolean);
+  return lines.map((line) => {
+    const fileWithCount = line.match(/^(.+)\s(\d+)$/);
+    if (fileWithCount) {
+      const frameCount = parseInt(fileWithCount[2], 10);
+      return { name: fileWithCount[1], frameCount };
+    } else {
+      return { name: line, frameCount: 1 };
+    }
+  });
+}

src/loaders.ts

@@ -1,3 +1,4 @@
+import { parseImageFrameList } from "./ifl";
 import { getActualResourcePath, getSource } from "./manifest";
 import { parseMissionScript } from "./mission";
 import { parseTerrainBuffer } from "./terrain";
@@ -45,6 +46,10 @@ export function interiorTextureToUrl(name: string, fallbackUrl?: string) {
   return getUrlForPath(`textures/${name}.png`, fallbackUrl);
 }
 
+export function textureFrameToUrl(fileName: string) {
+  return getUrlForPath(`textures/skins/${fileName}`);
+}
+
 export function shapeTextureToUrl(name: string, fallbackUrl?: string) {
   name = name.replace(/\.\d+$/, "");
   return getUrlForPath(`textures/skins/${name}.png`, fallbackUrl);
@@ -82,3 +87,10 @@ export async function loadTerrain(fileName: string) {
   const terrainBuffer = await res.arrayBuffer();
   return parseTerrainBuffer(terrainBuffer);
 }
+
+export async function loadImageFrameList(iflPath: string) {
+  const url = getUrlForPath(iflPath);
+  const res = await fetch(url);
+  const source = await res.text();
+  return parseImageFrameList(source);
+}