code wiki / _hdl_build / nx_wasm_arcade_html.nx
`nx_wasm_arcade_html.nx` source

1// nx_wasm_arcade_html.nx -- SOVEREIGN packager for the integer arcade wasm -> self-contained playable .html.
2// The emitted JS is the ACCEPTED last-mile and does ONLY two things: (1) BLIT our wasm framebuffer to the
3// screen via putImageData (copy bytes, NOT canvas drawing), (2) forward arrow/WASD keys to ex.tick(). ALL
4// game logic + rendering live in our sovereign wasm (no JS logic, no canvas-draw, no float, no 3rd-party).
5// usage: nx_wasm_arcade_html <in.wasm> <out.html>. license_tier: ORIGINAL
6import "nx_syscalls.nx"
7import "nx_base64.nx"
8
9func hw(fd: i64, s: *u8) -> i64 { var n: i64 = 0; while s[n] != (0 as u8) { n = n + 1 } sys_write(fd, s, n); return 0 }
10
11func main(argc: i64, argv: *i64) -> i64 {
12    if argc < 3 { hw(2, "usage: nx_wasm_arcade_html <in.wasm> <out.html>\n" as *u8); return 2 }
13    let wpath: *u8 = argv[1] as *u8
14    let hpath: *u8 = argv[2] as *u8
15    let wlen_p: *i64 = sys_mmap(8) as *i64
16    let wbytes: *u8 = sys_read_file(wpath, wlen_p)
17    if (wbytes as i64) == 0 { hw(2, "read wasm failed\n" as *u8); return 3 }
18    let wlen: i64 = wlen_p[0]
19    let b64: *u8 = sys_mmap(wlen * 2 + 64) as *u8
20    let b64len: i64 = b64_encode(wbytes, wlen, b64)
21
22    let fd: i64 = sys_openat_wr(hpath, 0x1a4)
23    if fd < 0 { hw(2, "open html failed\n" as *u8); return 4 }
24    hw(fd, "<!doctype html><html><head><meta charset='utf-8'><title>Nishi Arcade (sovereign wasm)</title><style>body{background:#10141e;margin:0;display:flex;flex-direction:column;justify-content:center;align-items:center;height:100vh;font-family:sans-serif;color:#cdd}canvas{image-rendering:pixelated;width:480px;height:384px;border:1px solid #2a3140;background:#1b2030}p{margin:8px}</style></head><body><h2>Nishi Arcade</h2><canvas id='c'></canvas><p id='hud'>arrows / WASD to move &middot; collect the gold</p><p style='color:#667;font-size:12px'>100% Nishi: logic + render + HUD score all drawn in sovereign WASM; the browser only blits our framebuffer &amp; forwards keys</p><script>\n" as *u8)
25    hw(fd, "const B='" as *u8)
26    sys_write(fd, b64, b64len)
27    hw(fd, "';\nconst bytes=Uint8Array.from(atob(B),c=>c.charCodeAt(0));\nWebAssembly.instantiate(bytes).then(r=>{const ex=r.instance.exports;const W=Number(ex.ww()),H=Number(ex.hh()),off=Number(ex.fb_off());const cv=document.getElementById('c');cv.width=W;cv.height=H;const ctx=cv.getContext('2d');const img=ctx.createImageData(W,H);function blit(){const mem=new Uint8Array(ex.memory.buffer);for(let i=0;i<W*H;i++){const b=off+i*8;img.data[i*4]=mem[b];img.data[i*4+1]=mem[b+1];img.data[i*4+2]=mem[b+2];img.data[i*4+3]=255;}ctx.putImageData(img,0,0);}ex.init();ex.render();blit();document.addEventListener('keydown',function(e){let d=-1;const k=e.key;if(k=='ArrowUp'||k=='w')d=0;else if(k=='ArrowDown'||k=='s')d=1;else if(k=='ArrowLeft'||k=='a')d=2;else if(k=='ArrowRight'||k=='d')d=3;if(d>=0){e.preventDefault();ex.tick(BigInt(d));ex.render();blit();}});}).catch(e=>{document.body.innerHTML+='<pre>'+e.message+'</pre>';});\n</script></body></html>\n" as *u8)
28    sys_close(fd)
29    hw(1, "wrote arcade html\n" as *u8)
30    return 0
31}
nx_wasm_arcade_html.nx source

`nx_wasm_arcade_html.nx` source
