weather: add wet road glow and light halos

config.js

@@ -143,10 +143,18 @@ window.CONFIG = {
             minDelayS: 8,         // minimum delay between storm flashes
             maxDelayS: 45,        // maximum delay between storm flashes
             doubleFlash: true     // some flashes flicker twice
+        },
+        wetRoads: {
+            enabled: true,
+            dryMinutes: 30,       // roads dry out after this many dry minutes
+            roadGain: 0.8,        // extra road-ribbon glow when wet
+            lightGain: 0.35       // extra halo on vehicle lights when wet
         }
         // weatherEffects: { enabled: false }
         // weatherEffects: { rain: { maxAlpha: 0.55, speed: 1.4 }, snow: { enabled: false } }
         // weatherEffects: { lightning: { gain: 2.0, minDelayS: 3, maxDelayS: 12 } }
+        // weatherEffects: { wetRoads: { enabled: false } }
+        // weatherEffects: { wetRoads: { dryMinutes: 10, roadGain: 1.4, lightGain: 0.7 } }
     },
 
     // ------------------------------------------------------------------

vendor/clouds3d.js

@@ -3870,6 +3870,8 @@ var CAR_FRAG_SRC = [
     'uniform float uBright;',  // band brightness (CONFIG.carLights.bandBrightness)',
     'uniform float uFadeA;',   // distance where the fade starts',
     'uniform float uFadeB;',   // distance where it is fully faded',
+    'uniform float uWet;',     // wet-road factor 0..1',
+    'uniform float uWetGain;', // extra road glow when wet',
     'varying float vLen;',
     'varying float vSide;',
     'varying float vDens;',
@@ -3886,9 +3888,13 @@ var CAR_FRAG_SRC = [
         // what a road looks like when the individual vehicle points are',
         // closer together than one light - the "bar" along the A-net.',
         'float body = 1.0 - smoothstep(0.0, 1.0, abs(vSide));',
-        'float a = dens * body * uNight * df * uBright;',
+        'float wet = clamp(uWet, 0.0, 1.0);',
+        'float a = dens * body * uNight * df * uBright * (1.0 + wet * uWetGain);',
         'if (a <= 0.002) discard;',
-        'gl_FragColor = vec4(vec3(1.0, 0.82, 0.58) * a, 1.0);',
+        'vec3 dryCol = vec3(1.0, 0.82, 0.58);',
+        'vec3 wetCol = vec3(0.72, 0.82, 1.0);',
+        'vec3 col = mix(dryCol, wetCol, wet * 0.55);',
+        'gl_FragColor = vec4(col * a, 1.0);',
     '}'
 ].join('\n');
 
@@ -3975,6 +3981,8 @@ var CARP_FRAG_SRC = [
     'uniform float uBright;',  // overall light intensity',
     'uniform float uFadeA;',   // distance where the fade starts',
     'uniform float uFadeB;',   // distance where it is fully faded',
+    'uniform float uWet;',     // wet-road factor 0..1',
+    'uniform float uWetGain;', // extra halo on lights when wet',
     'varying float vApproach;',
     'varying float vDist;',
     'varying float vSeed;',
@@ -3989,8 +3997,9 @@ var CARP_FRAG_SRC = [
         'vec2 pc = gl_PointCoord - 0.5;',
         'float d = length(pc) * 2.0;',
         // hot core plus a wide faint halo: a round light at any size',
+        'float wet = clamp(uWet, 0.0, 1.0);',
         'float core = exp(-d * d * 4.0);',
-        'float halo = (1.0 - smoothstep(0.0, 1.0, d)) * 0.30;',
+        'float halo = (1.0 - smoothstep(0.0, 1.0, d)) * (0.30 + wet * uWetGain);',
         'float g = max(core, halo);',
         'if (g <= 0.004) discard;',
         // soft occupancy + per-vehicle life cycle: a car fades in as the',
@@ -4894,7 +4903,9 @@ function applyCarBuild(gl, res) {
             halfW: gl.getUniformLocation(carProg, 'uHalfW'),
             bright: gl.getUniformLocation(carProg, 'uBright'),
             fadeA: gl.getUniformLocation(carProg, 'uFadeA'),
-            fadeB: gl.getUniformLocation(carProg, 'uFadeB')
+            fadeB: gl.getUniformLocation(carProg, 'uFadeB'),
+            wet: gl.getUniformLocation(carProg, 'uWet'),
+            wetGain: gl.getUniformLocation(carProg, 'uWetGain')
         };
     }
 }
@@ -6041,6 +6052,26 @@ var WEATHER_LIGHTNING_MIN_DELAY = (typeof WEATHER_LIGHTNING_CFG.minDelayS === 'n
 var WEATHER_LIGHTNING_MAX_DELAY = (typeof WEATHER_LIGHTNING_CFG.maxDelayS === 'number') ? Math.max(WEATHER_LIGHTNING_MIN_DELAY, WEATHER_LIGHTNING_CFG.maxDelayS) : 45;
 var WEATHER_LIGHTNING_DOUBLE = WEATHER_LIGHTNING_CFG.doubleFlash !== false;
 var lightningNextT = 0, lightningSeq = 0, lightningSeqT = 0, lightningFlash = 0;
+var WET_ROADS_CFG = WEATHER_FX_CFG.wetRoads || {};
+var WET_ROADS_ON = WET_ROADS_CFG.enabled !== false;
+var WET_ROADS_DRY_MINUTES = (typeof WET_ROADS_CFG.dryMinutes === 'number') ? Math.max(1, WET_ROADS_CFG.dryMinutes) : 30;
+var WET_ROADS_GAIN = (typeof WET_ROADS_CFG.roadGain === 'number') ? Math.max(0, WET_ROADS_CFG.roadGain) : 0.8;
+var WET_LIGHT_GAIN = (typeof WET_ROADS_CFG.lightGain === 'number') ? Math.max(0, WET_ROADS_CFG.lightGain) : 0.35;
+var roadWetness = 0, lastWetT = null;
+
+function updateRoadWetness(now) {
+    if (!WET_ROADS_ON) { roadWetness = 0; lastWetT = null; return 0; }
+    if (lastWetT === null) { lastWetT = now; return roadWetness; }
+    var dt = Math.max(0, Math.min(5, now - lastWetT));
+    lastWetT = now;
+    var wx = window.__currentWeather || {};
+    var precip = Number(wx.precipMm || 0);
+    var snow = Number(wx.snowMm || 0);
+    var input = Math.min(1.0, (precip + snow * 0.55) * 0.75);
+    var dry = dt / (WET_ROADS_DRY_MINUTES * 60.0);
+    roadWetness = Math.max(0, Math.min(1, roadWetness + input * dt * 0.25 - dry));
+    return roadWetness;
+}
 
 function updateLightning(now) {
     if (!WEATHER_LIGHTNING_ON) {
@@ -6795,6 +6826,7 @@ window.clouds3dRender = function(target) {
     // Aggregate artificial-light level (road ribbon, density curves,
     // aircraft): the mean over the per-light thresholds.
     var carNight = lightFactor(window.__currentSunAlt || 0);
+    var _roadWet = updateRoadWetness(now);
     if (carProg && (carVboM || carVboB) && carNight > 0.01) {
         var carPxScale = Math.max(0.45, Math.min(1.25, gl.drawingBufferHeight / 1080));
         var tCurve = Math.max(0, Math.min(1, (carNight - 0.10) / 0.40));
@@ -6821,6 +6853,8 @@ window.clouds3dRender = function(target) {
         gl.uniform1f(carUniforms.bright, CAR_BAND_BRIGHT);
         gl.uniform1f(carUniforms.fadeA, CAR_FADE_A);
         gl.uniform1f(carUniforms.fadeB, CAR_FADE_B);
+        gl.uniform1f(carUniforms.wet, _roadWet);
+        gl.uniform1f(carUniforms.wetGain, WET_ROADS_GAIN);
         gl.enable(gl.DEPTH_TEST);
         gl.depthMask(false);
         gl.enable(gl.BLEND);
@@ -6876,7 +6910,9 @@ window.clouds3dRender = function(target) {
                         sunAlt: gl.getUniformLocation(cpp, 'uSunAlt'),
                         lightHi: gl.getUniformLocation(cpp, 'uLightHi'),
                         lightLo: gl.getUniformLocation(cpp, 'uLightLo'),
-                        lightSoft: gl.getUniformLocation(cpp, 'uLightSoft')
+                        lightSoft: gl.getUniformLocation(cpp, 'uLightSoft'),
+                        wet: gl.getUniformLocation(cpp, 'uWet'),
+                        wetGain: gl.getUniformLocation(cpp, 'uWetGain')
                     };
                 }
             }
@@ -6907,6 +6943,8 @@ window.clouds3dRender = function(target) {
                 gl.uniform1f(carPtsUniforms.bright, CAR_BRIGHT);
                 gl.uniform1f(carPtsUniforms.fadeA, CAR_FADE_A);
                 gl.uniform1f(carPtsUniforms.fadeB, CAR_FADE_B);
+                gl.uniform1f(carPtsUniforms.wet, _roadWet);
+                gl.uniform1f(carPtsUniforms.wetGain, WET_LIGHT_GAIN);
                 var carPtsGroup = function (vbo, count, dash, speed, maxDens) {
                     if (!vbo || !count) return;
                     gl.bindBuffer(gl.ARRAY_BUFFER, vbo);
@@ -7318,6 +7356,7 @@ window.clouds3dRender = function(target) {
             rain: +_weather[0].toFixed(2),
             snow: +_weather[1].toFixed(2),
             lightning: +lightningFlash.toFixed(2),
+            wet: +roadWetness.toFixed(2),
             code: Number((window.__currentWeather || {}).code || 0)
         };
         var _rainI = _weather[0];