File size: 4,914 Bytes
f500658 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 | /**
* DOOM Engine - WebAssembly wrapper for doomgeneric
*/
import { existsSync, readFileSync } from "node:fs";
import { createRequire } from "node:module";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";
export interface DoomModule {
_doomgeneric_Create: (argc: number, argv: number) => void;
_doomgeneric_Tick: () => void;
_DG_GetFrameBuffer: () => number;
_DG_GetScreenWidth: () => number;
_DG_GetScreenHeight: () => number;
_DG_PushKeyEvent: (pressed: number, key: number) => void;
_malloc: (size: number) => number;
_free: (ptr: number) => void;
HEAPU8: Uint8Array;
HEAPU32: Uint32Array;
FS_createDataFile: (parent: string, name: string, data: number[], canRead: boolean, canWrite: boolean) => void;
FS_createPath: (parent: string, path: string, canRead: boolean, canWrite: boolean) => string;
setValue: (ptr: number, value: number, type: string) => void;
getValue: (ptr: number, type: string) => number;
}
export class DoomEngine {
private module: DoomModule | null = null;
private frameBufferPtr: number = 0;
private initialized = false;
private wadPath: string;
private _width = 640;
private _height = 400;
constructor(wadPath: string) {
this.wadPath = wadPath;
}
get width(): number {
return this._width;
}
get height(): number {
return this._height;
}
async init(): Promise<void> {
// Locate WASM build
const __dirname = dirname(fileURLToPath(import.meta.url));
const buildDir = join(__dirname, "doom", "build");
const doomJsPath = join(buildDir, "doom.js");
if (!existsSync(doomJsPath)) {
throw new Error(`WASM not found at ${doomJsPath}. Run ./doom/build.sh first`);
}
// Read WAD file
const wadData = readFileSync(this.wadPath);
const wadArray = Array.from(new Uint8Array(wadData));
// Load WASM module - eval to bypass jiti completely
const doomJsCode = readFileSync(doomJsPath, "utf-8");
const moduleExports: { exports: unknown } = { exports: {} };
const nativeRequire = createRequire(doomJsPath);
const moduleFunc = new Function("module", "exports", "__dirname", "__filename", "require", doomJsCode);
moduleFunc(moduleExports, moduleExports.exports, buildDir, doomJsPath, nativeRequire);
const createDoomModule = moduleExports.exports as (config: unknown) => Promise<DoomModule>;
const moduleConfig = {
locateFile: (path: string) => {
if (path.endsWith(".wasm")) {
return join(buildDir, path);
}
return path;
},
print: () => {},
printErr: () => {},
preRun: [
(module: DoomModule) => {
// Create /doom directory and add WAD
module.FS_createPath("/", "doom", true, true);
module.FS_createDataFile("/doom", "doom1.wad", wadArray, true, false);
},
],
};
this.module = await createDoomModule(moduleConfig);
if (!this.module) {
throw new Error("Failed to initialize DOOM module");
}
// Initialize DOOM
this.initDoom();
// Get framebuffer info
this.frameBufferPtr = this.module._DG_GetFrameBuffer();
this._width = this.module._DG_GetScreenWidth();
this._height = this.module._DG_GetScreenHeight();
this.initialized = true;
}
private initDoom(): void {
if (!this.module) return;
const args = ["doom", "-iwad", "/doom/doom1.wad"];
const argPtrs: number[] = [];
for (const arg of args) {
const ptr = this.module._malloc(arg.length + 1);
for (let i = 0; i < arg.length; i++) {
this.module.setValue(ptr + i, arg.charCodeAt(i), "i8");
}
this.module.setValue(ptr + arg.length, 0, "i8");
argPtrs.push(ptr);
}
const argvPtr = this.module._malloc(argPtrs.length * 4);
for (let i = 0; i < argPtrs.length; i++) {
this.module.setValue(argvPtr + i * 4, argPtrs[i]!, "i32");
}
this.module._doomgeneric_Create(args.length, argvPtr);
for (const ptr of argPtrs) {
this.module._free(ptr);
}
this.module._free(argvPtr);
}
/**
* Run one game tick
*/
tick(): void {
if (!this.module || !this.initialized) return;
this.module._doomgeneric_Tick();
}
/**
* Get current frame as RGBA pixel data
* DOOM outputs ARGB, we convert to RGBA
*/
getFrameRGBA(): Uint8Array {
if (!this.module || !this.initialized) {
return new Uint8Array(this._width * this._height * 4);
}
const pixels = this._width * this._height;
const buffer = new Uint8Array(pixels * 4);
for (let i = 0; i < pixels; i++) {
const argb = this.module.getValue(this.frameBufferPtr + i * 4, "i32");
const offset = i * 4;
buffer[offset + 0] = (argb >> 16) & 0xff; // R
buffer[offset + 1] = (argb >> 8) & 0xff; // G
buffer[offset + 2] = argb & 0xff; // B
buffer[offset + 3] = 255; // A
}
return buffer;
}
/**
* Push a key event
*/
pushKey(pressed: boolean, key: number): void {
if (!this.module || !this.initialized) return;
this.module._DG_PushKeyEvent(pressed ? 1 : 0, key);
}
isInitialized(): boolean {
return this.initialized;
}
}
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