Feature: TV screen CRT has a warm up and power down sequence

tv-player/src/core/animate.js

@@ -1,8 +1,8 @@
 import * as THREE from 'three';
-import { updateVcrDisplay } from '../scene/vcr-display.js';
 import { updateDoor } from '../scene/door.js';
+import { updateVcrDisplay } from '../scene/vcr-display.js';
 import { state } from '../state.js';
-
+import { updateScreenEffect } from '../scene/tv-set.js'
 
 function updateCamera() {
     const globalTime = Date.now() * 0.00003;
@@ -166,6 +166,7 @@ export function animate() {
     updateBooks();
     updateDoor();
     updatePictureFrame();
+    updateScreenEffect();
 
     // RENDER!
     state.renderer.render(state.scene, state.camera);

tv-player/src/core/video-player.js

@@ -1,6 +1,6 @@
 import * as THREE from 'three';
 import { state } from '../state.js';
-import { turnTvScreenOff, turnTvScreenOn } from '../scene/tv-set.js';
+import { turnTvScreenOff, turnTvScreenOn, setScreenEffect } from '../scene/tv-set.js';
 
 // --- Play video by index ---
 export function playVideoByIndex(index) {
@@ -15,8 +15,10 @@ export function playVideoByIndex(index) {
 
     if (index < 0 || index >= state.videoUrls.length) {
         console.info('End of playlist reached. Reload tapes to start again.');
-        state.screenLight.intensity = 0.0;
-        turnTvScreenOff();
+        setScreenEffect(2, () => { // Power-down effect
+            state.screenLight.intensity = 0.0;
+            turnTvScreenOff();
+        });
         state.isVideoLoaded = false;
         state.lastUpdateTime = -1; // force VCR to redraw
         return;
@@ -41,7 +43,8 @@ export function playVideoByIndex(index) {
         // 2. Apply the video texture to the screen mesh
         turnTvScreenOn();
         
-        // 3. Start playback 
+        // 3. Start playback and trigger the warm-up effect simultaneously
+        setScreenEffect(1); // Trigger warm-up
         state.videoElement.play().then(() => {
             state.isVideoLoaded = true;
             // Use the defined base intensity for screen glow

tv-player/src/scene/tv-set.js

@@ -181,7 +181,9 @@ export function turnTvScreenOn() {
 
     state.tvScreen.material = new THREE.ShaderMaterial({
         uniforms: {
-            videoTexture: { value: state.videoTexture }
+            videoTexture: { value: state.videoTexture },
+            u_effect_type: { value: 0.0 },
+            u_effect_strength: { value: 0.0 },
         },
         vertexShader: screenVertexShader,
         fragmentShader: screenFragmentShader,
@@ -189,4 +191,47 @@ export function turnTvScreenOn() {
     });
 
     state.tvScreen.material.needsUpdate = true;
+    setScreenEffect(1); // Trigger warm-up
+}
+
+/**
+ * Controls the warm-up and power-down effects on the TV screen.
+ * @param {number} effectType - 0 normal, 1 for warm-up, 2 for power-down.
+ * @param {function} onComplete - Optional callback when the animation finishes.
+ */
+export function setScreenEffect(effectType, onComplete) {
+    const material = state.tvScreen.material;
+    if (!material.uniforms) return;
+    
+    state.screenEffect.active = true;
+    state.screenEffect.type = effectType;
+    state.screenEffect.startTime = state.clock.getElapsedTime() * 1000;
+    state.screenEffect.onComplete = onComplete;
+}
+
+/**
+ * Updates the screen effect animation. Should be called in the main render loop.
+ */
+export function updateScreenEffect() {
+    if (!state.screenEffect.active) return;
+
+    const material = state.tvScreen.material;
+    if (!material.uniforms) return;
+
+    const elapsedTime = (state.clock.getElapsedTime() * 1000) - state.screenEffect.startTime;
+    const progress = Math.min(elapsedTime / state.screenEffect.duration, 1.0);
+    
+    const easedProgress = state.screenEffect.easing(progress);
+
+    material.uniforms.u_effect_type.value = state.screenEffect.type;
+    material.uniforms.u_effect_strength.value = easedProgress;
+
+    if (progress >= 1.0) {
+        state.screenEffect.active = false;
+        material.uniforms.u_effect_strength.value = (state.screenEffect.type === 2) ? 1.0 : 0.0; // Final state
+        if (state.screenEffect.onComplete) {
+            state.screenEffect.onComplete();
+        }
+        material.uniforms.u_effect_type.value = 0.0; // Reset effect type
+    }
 }

tv-player/src/shaders/screen-shaders.js

@@ -10,10 +10,41 @@ void main() {
 export const screenFragmentShader = `
 varying vec2 vUv;
 uniform sampler2D videoTexture;
+uniform float u_effect_type;     // 0: none, 1: warmup, 2: powerdown
+uniform float u_effect_strength; // 0.0 to 1.0
 
 void main() {
-    // Sample the video texture
-    gl_FragColor = texture2D(videoTexture, vUv);
+    vec2 centeredUv = vUv - 0.5;
+    vec4 finalColor;
+
+    if (u_effect_type < 0.5) { // No effect
+        finalColor = texture2D(videoTexture, vUv);
+    } else if (u_effect_type < 1.5) { // Warm-up effect
+        // A bright dot expands to reveal the screen content
+        float effectRadius = u_effect_strength * 0.75; // Max radius of 0.75 (sqrt(0.5*0.5 + 0.5*0.5))
+        float distanceToCenter = length(centeredUv);
+        
+        // Smoothly transition the edge of the circle
+        float vignette = smoothstep(effectRadius, effectRadius - 0.1, distanceToCenter);
+        vec4 videoColor = texture2D(videoTexture, vUv);
+        
+        finalColor = videoColor * vignette * u_effect_strength; // Fade in brightness
+
+    } else { // Power-down effect
+        // The image collapses into a bright horizontal line and fades
+        float collapseFactor = 1.0 - u_effect_strength;
+        
+        // Squeeze the UVs vertically
+        vec2 squeezedUv = vec2(vUv.x, 0.5 + (vUv.y - 0.5) * collapseFactor);
+        vec4 videoColor = texture2D(videoTexture, squeezedUv);
+        
+        // Create a bright glow where the line is
+        float lineGlow = pow(1.0 - abs(centeredUv.y) / (0.5 * collapseFactor + 0.01), 20.0);
+        
+        finalColor = videoColor * collapseFactor + vec4(0.8, 0.9, 1.0, 1.0) * lineGlow * u_effect_strength;
+
+    }
+
+    gl_FragColor = finalColor;
 }
 `;
-

tv-player/src/state.js

@@ -8,12 +8,21 @@ export function initState() {
     scene: null,
     camera: null,
     renderer: null,
+    clock: new THREE.Clock(),
     tvScreen: null,
     videoTexture: null,
     screenLight: null,
     lampLightPoint: null,
     lampLightSpot: null,
     effectsManager: null,
+    screenEffect: {
+        active: false,
+        type: 0,
+        startTime: 0,
+        duration: 1000, // in ms
+        onComplete: null,
+        easing: (t) => t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t, // easeInOutQuad
+    },
 
     // VCR Display
     lastUpdateTime: -1,