From aec43c0bcf721cf3f6a40ec64dbf0509474be58a Mon Sep 17 00:00:00 2001
From: Sky Johnson <skylearj@gmail.com>
Date: Tue, 9 Sep 2025 18:41:45 -0500
Subject: [PATCH] cloud rendering

---
 client/shaders/sky.fs | 71 +++++++++++++++++++++++++++++++++++++++++++
 client/sky/Sky.cpp    |  5 +++
 client/sky/Sky.hpp    |  1 +
 3 files changed, 77 insertions(+)

diff --git a/client/shaders/sky.fs b/client/shaders/sky.fs
index e6cda6a..aa4325f 100644
--- a/client/shaders/sky.fs
+++ b/client/shaders/sky.fs
@@ -22,6 +22,7 @@ uniform vec3 moonColor;
 uniform float moonIntensity;
 uniform float moonPhase;
 uniform float starsIntensity;
+uniform float time;
 
 // Output fragment color
 out vec4 finalColor;
@@ -31,6 +32,40 @@ float hash(vec2 p) {
     return fract(sin(dot(p, vec2(127.1, 311.7))) * 43758.5453);
 }
 
+// Noise function for clouds
+float noise(vec2 p) {
+    vec2 i = floor(p);
+    vec2 f = fract(p);
+    
+    // Four corners in 2D of a tile
+    float a = hash(i);
+    float b = hash(i + vec2(1.0, 0.0));
+    float c = hash(i + vec2(0.0, 1.0));
+    float d = hash(i + vec2(1.0, 1.0));
+    
+    // Smooth interpolation
+    vec2 u = f * f * (3.0 - 2.0 * f);
+    
+    return mix(a, b, u.x) + (c - a) * u.y * (1.0 - u.x) + (d - b) * u.x * u.y;
+}
+
+// Fractal brownian motion for cloud shapes
+float fbm(vec2 p) {
+    float value = 0.0;
+    float amplitude = 0.5;
+    float frequency = 2.0;
+    
+    for (int i = 0; i < 3; i++) {
+        value += amplitude * noise(p * frequency);
+        amplitude *= 0.5;
+        frequency *= 2.0;
+    }
+    
+    return value;
+}
+
+
+
 void main()
 {
     // Normalize the world position to get direction from center
@@ -42,6 +77,42 @@ void main()
     // Interpolate between horizon and zenith colors
     vec3 skyColor = mix(horizonColor, zenithColor, gradientFactor);
     
+    // Simple cloud layer (only during day)
+    if (direction.y > 0.1 && sunIntensity > 0.2) {
+        // Map direction to 2D cloud coordinates
+        vec2 cloudCoord = direction.xz / max(direction.y, 0.001) * 0.5;
+        
+        // Animate clouds
+        cloudCoord += vec2(time * 0.02, time * 0.01);
+        
+        // Generate cloud pattern using multiple layers of noise
+        float cloudNoise = 0.0;
+        cloudNoise += fbm(cloudCoord * 2.0) * 0.5;
+        cloudNoise += fbm(cloudCoord * 5.0) * 0.25;
+        cloudNoise += fbm(cloudCoord * 11.0) * 0.125;
+        
+        // Shape the clouds
+        float cloudDensity = smoothstep(0.4, 0.6, cloudNoise);
+        
+        // Fade clouds at horizon
+        cloudDensity *= smoothstep(0.0, 0.3, direction.y);
+        
+        if (cloudDensity > 0.01) {
+            // Simple cloud lighting
+            float lightness = 0.7 + 0.3 * sunIntensity;
+            
+            // Make clouds slightly bluish in shadow, whiter in light
+            vec3 cloudColor = mix(
+                vec3(0.7, 0.75, 0.85),  // Shadow color
+                vec3(1.0, 1.0, 1.0),     // Lit color
+                lightness
+            );
+            
+            // Mix clouds with sky
+            skyColor = mix(skyColor, cloudColor, cloudDensity * 0.8);
+        }
+    }
+    
     // Add stars (only visible at night)
     if (starsIntensity > 0.01 && direction.y > -0.1) { // Don't render stars below horizon
         // Create a simple star field using noise
diff --git a/client/sky/Sky.cpp b/client/sky/Sky.cpp
index b18e4fd..07673f8 100644
--- a/client/sky/Sky.cpp
+++ b/client/sky/Sky.cpp
@@ -37,6 +37,7 @@ Sky::Sky()
         moonIntensityLoc = GetShaderLocation(skyShader, "moonIntensity");
         moonPhaseLoc = GetShaderLocation(skyShader, "moonPhase");
         starsIntensityLoc = GetShaderLocation(skyShader, "starsIntensity");
+        timeLoc = GetShaderLocation(skyShader, "time");
         
         // Assign shader to sky model
         skyModel.materials[0].shader = skyShader;
@@ -290,6 +291,10 @@ void Sky::renderSkybox(const Camera3D& camera) {
         SetShaderValue(skyShader, moonPhaseLoc, &moon.phase, SHADER_UNIFORM_FLOAT);
         SetShaderValue(skyShader, starsIntensityLoc, &starsIntensity, SHADER_UNIFORM_FLOAT);
         
+        // Pass current time for cloud animation
+        float currentTime = GetTime();
+        SetShaderValue(skyShader, timeLoc, &currentTime, SHADER_UNIFORM_FLOAT);
+        
         // Draw the sky dome with shader
         DrawModel(skyModel, {0, 0, 0}, 1.0f, WHITE);
     } else {
diff --git a/client/sky/Sky.hpp b/client/sky/Sky.hpp
index 344bf72..b83219e 100644
--- a/client/sky/Sky.hpp
+++ b/client/sky/Sky.hpp
@@ -50,6 +50,7 @@ private:
     int moonIntensityLoc;
     int moonPhaseLoc;
     int starsIntensityLoc;
+    int timeLoc;
 
 public:
     Sky();