Arcade-Learning-Environment/docs/wasm/example.html at master · Farama-Foundation/Arcade-Learning-Environment · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>ALE WASM Example</title>
    <style>
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
            background: #1a1a1a;
            color: #fff;
        }
        .container {
            background: #2a2a2a;
            border-radius: 8px;
            padding: 20px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.3);
        }
        h1 {
            color: #4CAF50;
            border-bottom: 2px solid #4CAF50;
            padding-bottom: 10px;
        }
        .game-container {
            display: grid;
            grid-template-columns: auto 1fr;
            gap: 20px;
            margin: 20px 0;
        }
        .canvas-wrapper {
            background: #000;
            padding: 10px;
            border-radius: 8px;
            display: inline-block;
        }
        canvas {
            display: block;
            border: 2px solid #4CAF50;
            image-rendering: pixelated;
            image-rendering: crisp-edges;
        }
        .controls-panel {
            background: #333;
            padding: 20px;
            border-radius: 8px;
        }
        .control-group {
            margin: 15px 0;
        }
        .control-group h3 {
            color: #4CAF50;
            margin-top: 0;
            margin-bottom: 10px;
        }
        button {
            padding: 10px 20px;
            font-size: 14px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            margin: 5px;
            transition: all 0.3s;
            font-weight: 600;
        }
        button.primary {
            background: #4CAF50;
            color: white;
        }
        button.primary:hover:not(:disabled) {
            background: #45a049;
        }
        button.secondary {
            background: #2196F3;
            color: white;
        }
        button.secondary:hover:not(:disabled) {
            background: #1976D2;
        }
        button.danger {
            background: #f44336;
            color: white;
        }
        button.danger:hover:not(:disabled) {
            background: #d32f2f;
        }
        button:disabled {
            background: #555;
            cursor: not-allowed;
            opacity: 0.5;
        }
        button.active {
            box-shadow: 0 0 10px rgba(76, 175, 80, 0.8);
        }
        .stats {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 10px;
            margin: 15px 0;
        }
        .stat-item {
            background: #444;
            padding: 12px;
            border-radius: 4px;
        }
        .stat-item strong {
            display: block;
            color: #999;
            font-size: 0.85em;
            margin-bottom: 5px;
        }
        .stat-item span {
            font-size: 1.4em;
            color: #4CAF50;
            font-weight: bold;
        }
        .status {
            padding: 10px;
            margin: 10px 0;
            border-radius: 4px;
            font-family: monospace;
        }
        .status.loading {
            background: #fff3cd;
            color: #856404;
        }
        .status.success {
            background: #d4edda;
            color: #155724;
        }
        .status.error {
            background: #f8d7da;
            color: #721c24;
        }
        .status.playing {
            background: #d1ecf1;
            color: #0c5460;
        }
        .file-input-wrapper {
            position: relative;
            display: inline-block;
            cursor: pointer;
        }
        .file-input-wrapper input[type="file"] {
            position: absolute;
            left: -9999px;
        }
        .file-input-label {
            display: inline-block;
            padding: 10px 20px;
            background: #4CAF50;
            color: white;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 600;
        }
        .file-input-label:hover {
            background: #45a049;
        }
        .keyboard-help {
            background: #444;
            padding: 15px;
            border-radius: 4px;
            margin-top: 15px;
            font-size: 0.9em;
        }
        .keyboard-help kbd {
            background: #555;
            padding: 3px 8px;
            border-radius: 3px;
            font-family: monospace;
            border: 1px solid #666;
        }
        .fps-counter {
            background: rgba(0, 0, 0, 0.7);
            color: #4CAF50;
            padding: 5px 10px;
            border-radius: 4px;
            position: absolute;
            top: 20px;
            right: 20px;
            font-family: monospace;
            font-weight: bold;
        }
        label {
            display: flex;
            align-items: center;
            gap: 10px;
            margin: 10px 0;
        }
        input[type="range"] {
            flex: 1;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>ALE WASM Example</h1>

        <div id="status" class="status loading">Initializing ALE WASM...</div>

        <div class="control-group">
            <h3>Select Preloaded ROM</h3>
            <select id="romSelect" disabled style="padding: 10px; font-size: 14px; border-radius: 4px; border: 1px solid #555; background: #333; color: #fff; min-width: 200px;">
                <option value="">-- Select a ROM --</option>
            </select>
            <button id="loadRomBtn" class="primary" disabled style="margin-left: 10px;">Load</button>
        </div>

        <div class="control-group">
            <h3>Or Upload ROM</h3>
            <div class="file-input-wrapper">
                <input type="file" id="romFile" accept=".bin,.a26" disabled>
                <label for="romFile" class="file-input-label">📁 Choose ROM File</label>
            </div>
            <span id="fileName" style="color: #999; font-style: italic; margin-left: 10px;">No file selected</span>
        </div>

        <div class="game-container" id="gameContainer" style="display: none;">
            <div class="canvas-wrapper" style="position: relative;">
                <canvas id="gameCanvas" width="640" height="840"></canvas>
                <div class="fps-counter" id="fpsCounter">0 FPS</div>
            </div>

            <div class="controls-panel">
                <div class="control-group">
                    <h3>🎮 Game Controls</h3>
                    <div>
                        <button id="playBtn" class="primary" disabled>▶ Play</button>
                        <button id="pauseBtn" class="secondary" disabled>⏸ Pause</button>
                        <button id="resetBtn" class="danger" disabled>🔄 Reset</button>
                    </div>
                </div>

                <div class="control-group">
                    <h3>📊 Statistics</h3>
                    <div class="stats">
                        <div class="stat-item">
                            <strong>Episode Reward</strong>
                            <span id="totalReward">0</span>
                        </div>
                        <div class="stat-item">
                            <strong>Lives</strong>
                            <span id="lives">0</span>
                        </div>
                        <div class="stat-item">
                            <strong>Frame</strong>
                            <span id="frame">0</span>
                        </div>
                        <div class="stat-item">
                            <strong>Episode</strong>
                            <span id="episode">0</span>
                        </div>
                    </div>
                </div>

                <div class="control-group">
                    <h3>⚙️ Settings</h3>
                    <label>
                        <span style="width: 100px;">Speed:</span>
                        <input type="range" id="speedSlider" min="1" max="60" value="30">
                        <span id="speedValue">30 FPS</span>
                    </label>
                    <label>
                        <input type="checkbox" id="autoResetCheckbox" checked>
                        <span>Auto-reset on game over</span>
                    </label>
                </div>

                <div class="control-group">
                    <h3>🤖 AI Control</h3>
                    <button id="randomAIBtn" class="secondary" disabled>Random AI</button>
                    <p style="margin: 5px 0; font-size: 0.9em; color: #999;">
                        Let the AI take random actions
                    </p>
                </div>

                <div class="keyboard-help">
                    <strong>⌨️ Keyboard Controls:</strong><br>
                    <kbd>W</kbd> <kbd>A</kbd> <kbd>S</kbd> <kbd>D</kbd> Move<br>
                    <kbd>Space</kbd> Fire button<br>
                    <kbd>R</kbd> Reset game<br>
                    <kbd>P</kbd> Pause/Play
                </div>
            </div>
        </div>
    </div>

    <script src="ale.js"></script>
    <script>
        // createALEModule is available as a global after loading ale.js

        let ALE, ale;
        let isPlaying = false;
        let isAIMode = false;
        let animationFrameId = null;
        let totalReward = 0;
        let episodeCount = 0;
        let minimalActions = [];

        const canvas = document.getElementById('gameCanvas');
        const ctx = canvas.getContext('2d');
        const statusDiv = document.getElementById('status');
        const romFileInput = document.getElementById('romFile');
        const romSelect = document.getElementById('romSelect');
        const loadRomBtn = document.getElementById('loadRomBtn');

        // FPS tracking
        let lastFrameTime = performance.now();
        let frameCount = 0;
        let fps = 0;

        function updateStatus(message, type = 'loading') {
            statusDiv.className = `status ${type}`;
            statusDiv.textContent = message;
        }

        // Populate ROM dropdown from preloaded ROMs in virtual filesystem
        function populateRomList() {
<!--            try {-->
                const files = ALE.FS.readdir('/roms');
                console.log(files);
                const roms = files.filter(f => f !== '.' && f !== '..' && f.endsWith('.bin')).sort();

                if (roms.length > 0) {
                    romSelect.innerHTML = '<option value="">-- Select a ROM (' + roms.length + ' available) --</option>';
                    roms.forEach(rom => {
                        const option = document.createElement('option');
                        option.value = '/roms/' + rom;
                        const displayName = rom.replace('.bin', '').replace(/_/g, ' ').replace(/\b\w/g, c => c.toUpperCase());
                        option.textContent = displayName;
                        romSelect.appendChild(option);
                    });
                    romSelect.disabled = false;
                    loadRomBtn.disabled = false;
                } else {
                    romSelect.innerHTML = '<option value="">No preloaded ROMs found</option>';
                }
<!--            } catch (e) {-->
<!--                romSelect.innerHTML = '<option value="">No preloaded ROMs (WASM_PRELOAD_ROMS=OFF)</option>';-->
<!--            }-->
        }

        // Common ROM loading logic
        function onRomLoaded(romName) {
            minimalActions = ale.getMinimalActionSet();

            updateStatus(`ROM loaded: ${romName}. Ready to play!`, 'success');
            document.getElementById('gameContainer').style.display = 'grid';

            // Enable controls
            document.getElementById('playBtn').disabled = false;
            document.getElementById('resetBtn').disabled = false;
            document.getElementById('randomAIBtn').disabled = false;

            // Initial render
            renderFrame();
            updateStats();
        }

        // Initialize ALE
        async function initALE() {
            try {
                updateStatus('Loading ALE WASM module...', 'loading');
                ALE = await createALEModule();
                ale = new ALE.ALEInterface();

                // Configure ALE
                ale.setBool('display_screen', false);
                ale.setBool('sound', false);
                ale.setFloat('repeat_action_probability', 0.0);

                // Populate ROM dropdown
                populateRomList();

                updateStatus(`ALE ${ALE.ALEInterface.getVersion()} ready. Select a ROM or upload your own.`, 'success');
                romFileInput.disabled = false;

            } catch (error) {
                console.error('Failed to initialize ALE:', error);
                updateStatus(`Error: ${error.message}`, 'error');
            }
        }

        // Handle preloaded ROM selection
        loadRomBtn.addEventListener('click', () => {
            const romPath = romSelect.value;
            if (!romPath) {
                updateStatus('Please select a ROM first', 'error');
                return;
            }

            updateStatus('Loading ROM...', 'loading');
            try {
                ale.loadROM(romPath);
                const displayName = romSelect.options[romSelect.selectedIndex].textContent;
                onRomLoaded(displayName);
            } catch (error) {
                console.error('Failed to load ROM:', error);
                updateStatus(`Error loading ROM: ${error.message}`, 'error');
            }
        });

        romSelect.addEventListener('dblclick', () => {
            if (romSelect.value) {
                loadRomBtn.click();
            }
        });

        // Load ROM from file upload
        romFileInput.addEventListener('change', async (e) => {
            const file = e.target.files[0];
            if (!file) return;

            document.getElementById('fileName').textContent = file.name;
            updateStatus('Loading ROM...', 'loading');

            try {
                await ale.loadROMFromFile(file);
                onRomLoaded(file.name);
            } catch (error) {
                console.error('Failed to load ROM:', error);
                updateStatus(`Error loading ROM: ${error.message}`, 'error');
            }
        });

        // Render current frame to canvas
        function renderFrame() {
            const width = ale.getScreenWidth();
            const height = ale.getScreenHeight();
            const rgb = ale.getScreenRGB();

            // Create ImageData from RGB array (interleaved format: RGBRGBRGB...)
            const imageData = new Uint8ClampedArray(width * height * 4);
            for (let i = 0; i < width * height; i++) {
                imageData[i * 4] = rgb[i * 3];         // R
                imageData[i * 4 + 1] = rgb[i * 3 + 1]; // G
                imageData[i * 4 + 2] = rgb[i * 3 + 2]; // B
                imageData[i * 4 + 3] = 255;            // A
            }

            // Create temporary canvas at native resolution
            const tempCanvas = document.createElement('canvas');
            tempCanvas.width = width;
            tempCanvas.height = height;
            const tempCtx = tempCanvas.getContext('2d');
            tempCtx.putImageData(new ImageData(imageData, width, height), 0, 0);

            // Scale to display canvas
            ctx.imageSmoothingEnabled = false;
            ctx.drawImage(tempCanvas, 0, 0, canvas.width, canvas.height);
        }

        // Update statistics display
        function updateStats() {
            document.getElementById('totalReward').textContent = totalReward;
            document.getElementById('lives').textContent = ale.lives();
            document.getElementById('frame').textContent = ale.getEpisodeFrameNumber();
            document.getElementById('episode').textContent = episodeCount;
        }

        // Game loop
        function gameLoop() {
            if (!isPlaying) return;

            // Choose action
            let action;
            if (isAIMode) {
                action = minimalActions[Math.floor(Math.random() * minimalActions.length)];
            } else {
                action = 0; // NOOP if no keyboard input
            }

            // Take action
            const reward = ale.act(action);
            totalReward += reward;

            // Check game over
            if (ale.gameOver()) {
                if (document.getElementById('autoResetCheckbox').checked) {
                    ale.resetGame();
                    totalReward = 0;
                    episodeCount++;
                } else {
                    stop();
                    updateStatus('Game Over! Reset to continue.', 'error');
                }
            }

            // Render and update
            renderFrame();
            updateStats();

            // FPS calculation
            frameCount++;
            const now = performance.now();
            if (now - lastFrameTime >= 1000) {
                fps = frameCount;
                document.getElementById('fpsCounter').textContent = `${fps} FPS`;
                frameCount = 0;
                lastFrameTime = now;
            }

            // Schedule next frame based on speed setting
            const targetFPS = parseInt(document.getElementById('speedSlider').value);
            const frameDelay = 1000 / targetFPS;
            setTimeout(() => {
                animationFrameId = requestAnimationFrame(gameLoop);
            }, frameDelay);
        }

        // Control functions
        function play() {
            if (isPlaying) return;
            isPlaying = true;
            updateStatus('Playing...', 'playing');
            document.getElementById('playBtn').disabled = true;
            document.getElementById('pauseBtn').disabled = false;
            gameLoop();
        }

        function pause() {
            isPlaying = false;
            if (animationFrameId) {
                cancelAnimationFrame(animationFrameId);
                animationFrameId = null;
            }
            updateStatus('Paused', 'success');
            document.getElementById('playBtn').disabled = false;
            document.getElementById('pauseBtn').disabled = true;
        }

        function stop() {
            pause();
            isAIMode = false;
            document.getElementById('randomAIBtn').classList.remove('active');
        }

        function reset() {
            stop();
            ale.resetGame();
            totalReward = 0;
            episodeCount++;
            renderFrame();
            updateStats();
            updateStatus('Game reset', 'success');
        }

        // Button event listeners
        document.getElementById('playBtn').addEventListener('click', play);
        document.getElementById('pauseBtn').addEventListener('click', pause);
        document.getElementById('resetBtn').addEventListener('click', reset);

        document.getElementById('randomAIBtn').addEventListener('click', () => {
            isAIMode = !isAIMode;
            document.getElementById('randomAIBtn').classList.toggle('active');
            if (isAIMode && !isPlaying) {
                play();
            }
        });

        document.getElementById('speedSlider').addEventListener('input', (e) => {
            document.getElementById('speedValue').textContent = `${e.target.value} FPS`;
        });

        // Keyboard controls
        const keyMap = {
            'w': 2,
            'W': 2,
            's': 5,
            'S': 5,
            'a': 4,
            'A': 4,
            'd': 3,
            'D': 3,
            ' ': 1,
            'r': 'reset',
            'R': 'reset',
            'p': 'pause',
            'P': 'pause'
        };

        document.addEventListener('keydown', (e) => {
            if (!ale || isAIMode) return;

            const action = keyMap[e.key];
            if (action === 'reset') {
                e.preventDefault();
                reset();
            } else if (action === 'pause') {
                e.preventDefault();
                if (isPlaying) pause();
                else play();
            } else if (typeof action === 'number') {
                e.preventDefault();
                if (!isPlaying) play();

                const reward = ale.act(action);
                totalReward += reward;
                renderFrame();
                updateStats();
            }
        });

        // Initialize
        initALE();
    </script>
</body>
</html>