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Initial commit: ASCILINE Engine - Modular & Optimized
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YusufB5
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288
app.js
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288
app.js
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/**
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* ASCILINE ENGINE - Core Logic
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* =========================================
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* Handles WebSocket communication, frame buffering,
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* and dual-mode rendering (Canvas/DOM).
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*/
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const player = document.getElementById('ascii-player');
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const canvas = document.getElementById('ascii-canvas');
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const ctx = canvas.getContext('2d');
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const statusEl = document.getElementById('status');
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const container = document.getElementById('player-container');
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const overlay = document.getElementById('play-overlay');
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// ── STATE ──
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let state = 'IDLE'; // IDLE | PLAYING | DISSOLVING
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let ws = null;
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const frameBuffer = [];
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const BUFFER_SIZE = 4;
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let targetFps = 24;
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let frameInterval = 1000 / targetFps;
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let renderMode = 1;
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// Grid & Dimensions
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let gridCols = 0, gridRows = 0;
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let charWidth = 0, charHeight = 0;
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let xPos = null, yPos = null;
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// Timing & Metrics
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let lastRenderTime = 0;
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let frameCount = 0, currentFps = 0, lastFpsUpdate = 0;
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let lastFrameView = null; // Stored for the ripple effect
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// Character Lookup Table (optimization)
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const CHAR_LUT = new Array(128);
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for (let i = 0; i < 128; i++) CHAR_LUT[i] = String.fromCharCode(i);
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/**
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* Pre-calculates positions and scales canvas for high-performance rendering.
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*/
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function buildCanvas(cols, rows) {
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gridCols = cols;
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gridRows = rows;
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ctx.font = 'bold 8px Courier New';
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charWidth = Math.ceil(ctx.measureText('M').width);
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charHeight = 8;
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canvas.width = cols * charWidth;
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canvas.height = rows * charHeight;
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canvas.style.display = 'block';
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player.style.display = 'none';
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container.style.minWidth = canvas.width + 'px';
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container.style.minHeight = canvas.height + 'px';
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ctx.font = 'bold 8px Courier New';
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ctx.textBaseline = 'top';
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xPos = new Float32Array(cols);
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yPos = new Float32Array(rows);
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for (let c = 0; c < cols; c++) xPos[c] = c * charWidth;
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for (let r = 0; r < rows; r++) yPos[r] = r * charHeight;
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}
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/**
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* Initiates WebSocket connection and stream handling.
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*/
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function startStream() {
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if (state !== 'IDLE') return;
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state = 'PLAYING';
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overlay.classList.add('hidden');
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statusEl.textContent = 'Connecting...';
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statusEl.style.color = 'var(--accent-color)';
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frameBuffer.length = 0;
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lastFrameView = null;
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frameCount = 0;
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currentFps = 0;
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const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
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ws = new WebSocket(`${protocol}//${location.host}/ws`);
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ws.binaryType = 'arraybuffer';
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ws.onmessage = (event) => {
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if (state !== 'PLAYING') return;
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if (typeof event.data === 'string') {
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if (event.data.startsWith('INIT:')) {
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const p = event.data.split(':');
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targetFps = parseFloat(p[1]);
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frameInterval = 1000 / targetFps;
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renderMode = parseInt(p[2]);
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if (renderMode > 1) {
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buildCanvas(parseInt(p[3]), parseInt(p[4]));
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} else {
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player.style.display = 'block';
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canvas.style.display = 'none';
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}
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return;
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}
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frameBuffer.push(event.data);
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} else {
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frameBuffer.push(event.data);
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}
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// Buffer Overflow Protection
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while (frameBuffer.length > BUFFER_SIZE * 3) frameBuffer.shift();
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// Start render loop once buffered
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if (frameBuffer.length >= BUFFER_SIZE && lastRenderTime === 0) {
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lastRenderTime = performance.now();
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lastFpsUpdate = lastRenderTime;
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requestAnimationFrame(renderFrame);
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}
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};
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ws.onopen = () => {
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statusEl.textContent = 'Buffering...';
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};
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ws.onclose = () => {
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if (state === 'PLAYING') {
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statusEl.textContent = 'Stream Ended.';
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statusEl.style.color = '#888';
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setTimeout(() => resetToIdle(), 1500);
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}
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};
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ws.onerror = () => {
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statusEl.textContent = 'Connection Error!';
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statusEl.style.color = '#ff0000';
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setTimeout(() => resetToIdle(), 2000);
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};
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}
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/**
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* Main render loop using requestAnimationFrame.
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*/
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function renderFrame(now) {
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if (state !== 'PLAYING') return;
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requestAnimationFrame(renderFrame);
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const elapsed = now - lastRenderTime;
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if (elapsed < frameInterval) return;
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// FPS Counter
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frameCount++;
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if (now - lastFpsUpdate >= 1000) {
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currentFps = frameCount;
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frameCount = 0;
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lastFpsUpdate = now;
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let modeText = 'B&W';
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const modes = { 2: '512 Color', 3: '32K Color', 4: '262K Color', 5: '16M Ultra' };
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modeText = modes[renderMode] || 'B&W';
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statusEl.textContent = `FPS: ${currentFps}/${Math.round(targetFps)} | Buf: ${frameBuffer.length} | ${modeText}`;
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}
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if (frameBuffer.length === 0) return;
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lastRenderTime = now;
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const frame = frameBuffer.shift();
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if (renderMode === 1) {
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player.textContent = frame;
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} else {
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const view = new Uint8Array(frame);
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lastFrameView = view;
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ctx.fillStyle = '#050505';
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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ctx.font = 'bold 8px Courier New';
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ctx.textBaseline = 'top';
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let col = 0, row = 0, prevPacked = -1;
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for (let idx = 0; idx < view.length; idx += 4) {
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const packed = (view[idx+1] << 16) | (view[idx+2] << 8) | view[idx+3];
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if (packed !== prevPacked) {
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ctx.fillStyle = `rgb(${view[idx+1]},${view[idx+2]},${view[idx+3]})`;
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prevPacked = packed;
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}
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ctx.fillText(CHAR_LUT[view[idx]], xPos[col], yPos[row]);
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col++;
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if (col >= gridCols) { col = 0; row++; }
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}
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}
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}
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/**
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* Visual Effect: Ripple Dissolve
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* Triggered on click during playback.
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*/
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function triggerRipple(clickX, clickY) {
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if (!lastFrameView || renderMode === 1) {
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resetToIdle();
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return;
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}
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state = 'DISSOLVING';
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if (ws) { ws.onclose = null; ws.close(); ws = null; }
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const fv = lastFrameView;
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const rippleSpeed = 400;
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const waveFront = 70;
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const maxShake = 6;
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const maxDist = Math.sqrt(canvas.width * canvas.width + canvas.height * canvas.height);
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const startTime = performance.now();
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statusEl.textContent = '';
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function animateRipple(now) {
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const elapsed = (now - startTime) / 1000;
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const radius = elapsed * rippleSpeed;
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if (radius > maxDist + waveFront + 20) {
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resetToIdle();
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return;
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}
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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ctx.font = 'bold 8px Courier New';
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ctx.textBaseline = 'top';
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let col = 0, row = 0;
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for (let idx = 0; idx < fv.length; idx += 4) {
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const px = xPos[col];
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const py = yPos[row];
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const dx = px - clickX;
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const dy = py - clickY;
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const dist = Math.sqrt(dx * dx + dy * dy);
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if (dist > radius) {
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ctx.globalAlpha = 1;
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ctx.fillStyle = `rgb(${fv[idx+1]},${fv[idx+2]},${fv[idx+3]})`;
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ctx.fillText(CHAR_LUT[fv[idx]], px, py);
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} else if (dist > radius - waveFront) {
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const progress = (radius - dist) / waveFront;
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const shake = Math.sin(progress * Math.PI) * maxShake;
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const ox = (Math.random() - 0.5) * shake * 2;
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const oy = (Math.random() - 0.5) * shake * 2;
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ctx.globalAlpha = 1 - progress;
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ctx.fillStyle = `rgb(${fv[idx+1]},${fv[idx+2]},${fv[idx+3]})`;
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ctx.fillText(CHAR_LUT[fv[idx]], px + ox, py + oy);
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}
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col++;
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if (col >= gridCols) { col = 0; row++; }
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}
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ctx.globalAlpha = 1;
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requestAnimationFrame(animateRipple);
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}
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requestAnimationFrame(animateRipple);
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}
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function resetToIdle() {
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state = 'IDLE';
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if (ws) { ws.onclose = null; ws.close(); ws = null; }
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frameBuffer.length = 0;
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lastRenderTime = 0;
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lastFrameView = null;
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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player.textContent = '';
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overlay.classList.remove('hidden');
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statusEl.textContent = 'Ready';
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statusEl.style.color = 'rgba(255,255,255,0.6)';
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}
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// ── EVENT LISTENERS ──
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overlay.addEventListener('click', (e) => {
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e.stopPropagation();
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startStream();
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});
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container.addEventListener('click', (e) => {
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if (state !== 'PLAYING') return;
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const rect = canvas.getBoundingClientRect();
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const scaleX = canvas.width / rect.width;
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const scaleY = canvas.height / rect.height;
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const clickX = (e.clientX - rect.left) * scaleX;
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const clickY = (e.clientY - rect.top) * scaleY;
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triggerRipple(clickX, clickY);
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});
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