neser 0.1.1

NESER - NES Emulator in Rust - is a NES emulator written in Rust. It aims to be a high-quality, hardware-accurate emulator that is also easy to use and extend. It supports a wide range of NES games and features, including various mappers, audio processing, and input handling. NESER is designed to be modular and extensible, allowing developers to easily add new features or support for additional hardware. It can be run using one of two frontends: a native desktop application using SDL2, or a web application using WebAssembly. The desktop application provides a high-performance, feature-rich experience with support for various input devices and display options, while the web application allows users to play NES games directly in their browsers without needing to install any software in a BYOR manner (Bring Your Own Roms).
Documentation 
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

const h2 = (n) => n.toString(16).toUpperCase().padStart(2, "0");

/**
 * Formats a single OAM sprite entry as a string.
 * Format: "NN: Y=YY tile=TT attr=AA X=XX" (all values in hex).
 *
 * @param {number} index - Sprite index (0–63).
 * @param {number} y     - Y position.
 * @param {number} tile  - Tile index.
 * @param {number} attrs - Attribute byte.
 * @param {number} x     - X position.
 * @returns {string}
 */
export function formatOamEntry(index, y, tile, attrs, x) {
    return `${index.toString().padStart(2, "0")}: Y=${h2(y)} tile=${h2(tile)} attr=${h2(attrs)} X=${h2(x)}`;
}

/**
 * Builds the HTML for the OAM debugger panel.
 *
 * @param {number[]|null} oam - 256-byte OAM array from the snapshot.
 * @returns {string} HTML string for the OAM panel.
 */
export function buildOamHtml(oam) {
    if (!Array.isArray(oam) || oam.length < 256) return "";

    const rows = [];
    for (let i = 0; i < 64; i++) {
        const base = i * 4;
        const entry = formatOamEntry(i, oam[base], oam[base + 1], oam[base + 2], oam[base + 3]);
        const esc = entry.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
        rows.push(`<span class="debugger-oam-row">${esc}</span>`);
    }

    return (
        `<span class="debugger-oam-title">OAM</span>` +
        `<span class="debugger-oam-header"># : Y    tile attr X</span>` +
        `<span class="debugger-oam-block">${rows.join("")}</span>`
    );
}