4 files changed, 126 insertions, 0 deletions
diff --git a/engine/config/assets.ts b/engine/config/assets.ts
new file mode 100644
index 0000000..51a5303
--- /dev/null
+++ b/engine/config/assets.ts
@@ -0,0 +1,40 @@
+import type { SpriteSpec } from "./sprites";
+import { SPRITE_SPECS } from "./sprites";
+
+export const IMAGES = new Map<string, HTMLImageElement>();
+
+export const loadSpritesIntoImageElements = (
+  spriteSpecs: Partial<SpriteSpec>[]
+): Promise<void>[] => {
+  const spritePromises: Promise<void>[] = [];
+
+  for (const spriteSpec of spriteSpecs) {
+    if (spriteSpec.sheet) {
+      const img = new Image();
+      img.src = spriteSpec.sheet;
+      IMAGES.set(spriteSpec.sheet, img);
+
+      spritePromises.push(
+        new Promise((resolve) => {
+          img.onload = () => resolve();
+        })
+      );
+    }
+
+    if (spriteSpec.states) {
+      spritePromises.push(
+        ...loadSpritesIntoImageElements(Object.values(spriteSpec.states))
+      );
+    }
+  }
+
+  return spritePromises;
+};
+
+export const loadAssets = () =>
+  Promise.all([
+    ...loadSpritesIntoImageElements(
+      Array.from(SPRITE_SPECS.keys()).map((key) => SPRITE_SPECS.get(key))
+    ),
+    // TODO: Sound
+  ]);
diff --git a/engine/config/constants.ts b/engine/config/constants.ts
new file mode 100644
index 0000000..27c8160
--- /dev/null
+++ b/engine/config/constants.ts
@@ -0,0 +1,34 @@
+import { Action } from "../interfaces";
+
+export namespace KeyConstants {
+  export const KeyActions: Record<string, Action> = {
+    a: Action.MOVE_LEFT,
+    ArrowLeft: Action.MOVE_LEFT,
+    d: Action.MOVE_RIGHT,
+    ArrowRight: Action.MOVE_RIGHT,
+    w: Action.JUMP,
+    ArrowUp: Action.JUMP,
+  };
+
+  export const ActionKeys: Map<Action, string[]> = Object.keys(
+    KeyActions
+  ).reduce((acc: Map<Action, string[]>, key) => {
+    const action = KeyActions[key];
+
+    if (acc.has(action)) {
+      acc.get(action).push(key);
+      return acc;
+    }
+
+    acc.set(action, [key]);
+    return acc;
+  }, new Map<Action, string[]>());
+}
+
+export namespace PhysicsConstants {
+  export const MAX_JUMP_TIME_MS = 150;
+  export const GRAVITY = 0.0075;
+  export const PLAYER_MOVE_VEL = 1;
+  export const PLAYER_JUMP_ACC = -0.01;
+  export const PLAYER_JUMP_INITIAL_VEL = -0.9;
+}
diff --git a/engine/config/index.ts b/engine/config/index.ts
new file mode 100644
index 0000000..7a1052a
--- /dev/null
+++ b/engine/config/index.ts
@@ -0,0 +1,3 @@
+export * from "./constants";
+export * from "./assets.ts";
+export * from "./sprites.ts";
diff --git a/engine/config/sprites.ts b/engine/config/sprites.ts
new file mode 100644
index 0000000..18bec73
--- /dev/null
+++ b/engine/config/sprites.ts
@@ -0,0 +1,49 @@
+export enum Sprites {
+  FLOOR,
+  TRAMPOLINE,
+  COFFEE,
+}
+
+export interface SpriteSpec {
+  sheet: string;
+  width: number;
+  height: number;
+  frames: number;
+  msPerFrame: number;
+  states?: Record<string | number, Partial<SpriteSpec>>;
+}
+
+export const SPRITE_SPECS: Map<Sprites, Partial<SpriteSpec>> = new Map<
+  Sprites,
+  SpriteSpec
+>();
+
+const floorSpriteSpec = {
+  height: 40,
+  frames: 3,
+  msPerFrame: 125,
+  states: {},
+};
+floorSpriteSpec.states = [40, 80, 120, 160].reduce((acc, cur) => {
+  acc[cur] = {
+    width: cur,
+    sheet: `/assets/floor_tile_${cur}.png`,
+  };
+  return acc;
+}, {});
+SPRITE_SPECS.set(Sprites.FLOOR, floorSpriteSpec);
+
+SPRITE_SPECS.set(Sprites.COFFEE, {
+  msPerFrame: 100,
+  width: 60,
+  height: 45,
+  frames: 3,
+  states: {
+    LEFT: {
+      sheet: "/assets/coffee_left.png",
+    },
+    RIGHT: {
+      sheet: "/assets/coffee_right.png",
+    },
+  },
+});