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

1// nx_wasm_city_html.nx -- SOVEREIGN packager: the City-Building wasm -> a self-contained playable .html. JS
2// does ONLY: blit our wasm framebuffer, map a canvas CLICK to game coords -> ex.click(x,y), and a request
3// AnimationFrame loop calling ex.tick()+ex.render(). All logic+render in sovereign wasm.
4// usage: nx_wasm_city_html <in.wasm> <out.html>. license_tier: ORIGINAL
5import "nx_syscalls.nx"
6import "nx_base64.nx"
7
8func 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 }
9
10func main(argc: i64, argv: *i64) -> i64 {
11    if argc < 3 { hw(2, "usage: nx_wasm_city_html <in.wasm> <out.html>\n" as *u8); return 2 }
12    let wlen_p: *i64 = sys_mmap(8) as *i64
13    let wbytes: *u8 = sys_read_file(argv[1] as *u8, wlen_p)
14    if (wbytes as i64) == 0 { hw(2, "read wasm failed\n" as *u8); return 3 }
15    let wlen: i64 = wlen_p[0]
16    let b64: *u8 = sys_mmap(wlen * 2 + 64) as *u8
17    let b64len: i64 = b64_encode(wbytes, wlen, b64)
18    let fd: i64 = sys_openat_wr(argv[2] as *u8, 0x1a4)
19    if fd < 0 { hw(2, "open html failed\n" as *u8); return 4 }
20    hw(fd, "<!doctype html><html><head><meta charset='utf-8'><title>Nishi City (sovereign wasm)</title><style>body{background:#0b0f1a;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:400px;height:340px;border:1px solid #2a3140;background:#1e2822;cursor:pointer}p{margin:8px}</style></head><body><h2>Nishi City</h2><canvas id='c'></canvas><p id='hud'>click a toolbar building (blue house / green farm / gold market), then click the grid to build &middot; balance food &amp; gold to grow population</p><p style='color:#667;font-size:12px'>100% Nishi: logic + render + economy all in sovereign WASM; the browser only blits our framebuffer &amp; forwards clicks</p><script>\n" as *u8)
21    hw(fd, "const B='" as *u8)
22    sys_write(fd, b64, b64len)
23    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);}cv.addEventListener('click',function(e){const r=cv.getBoundingClientRect();const x=Math.floor((e.clientX-r.left)*W/r.width);const y=Math.floor((e.clientY-r.top)*H/r.height);ex.click(BigInt(x),BigInt(y));});ex.init();function loop(){ex.tick(0n);ex.render();blit();requestAnimationFrame(loop);}requestAnimationFrame(loop);}).catch(e=>{document.body.innerHTML+='<pre>'+e.message+'</pre>';});\n</script></body></html>\n" as *u8)
24    sys_close(fd)
25    hw(1, "wrote city html\n" as *u8)
26    return 0
27}
nx_wasm_city_html.nx source

`nx_wasm_city_html.nx` source
