Weather: rain and snow shaders.

Shaders/frag/weather_rain.frag

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+#version 450
+
+layout(location = 0) in vec2 qt_TexCoord0;
+layout(location = 0) out vec4 fragColor;
+
+layout(binding = 1) uniform sampler2D source;
+
+layout(std140, binding = 0) uniform buf {
+    mat4 qt_Matrix;
+    float qt_Opacity;
+    float time;
+    float itemWidth;
+    float itemHeight;
+    vec4 bgColor;
+    float cornerRadius;
+} ubuf;
+
+// Signed distance function for rounded rectangle
+float roundedBoxSDF(vec2 center, vec2 size, float radius) {
+    vec2 q = abs(center) - size + radius;
+    return min(max(q.x, q.y), 0.0) + length(max(q, 0.0)) - radius;
+}
+
+vec3 hash3(vec2 p) {
+    vec3 q = vec3(dot(p, vec2(127.1, 311.7)),
+                  dot(p, vec2(269.5, 183.3)),
+                  dot(p, vec2(419.2, 371.9)));
+    return fract(sin(q) * 43758.5453);
+}
+
+float noise(vec2 x, float iTime) {
+    vec2 p = floor(x);
+    vec2 f = fract(x);
+
+    float va = 0.0;
+    for (int j = -2; j <= 2; j++) {
+        for (int i = -2; i <= 2; i++) {
+            vec2 g = vec2(float(i), float(j));
+            vec3 o = hash3(p + g);
+            vec2 r = g - f + o.xy;
+            float d = sqrt(dot(r, r));
+            float ripple = max(mix(smoothstep(0.99, 0.999, max(cos(d - iTime * 2.0 + (o.x + o.y) * 5.0), 0.0)), 0.0, d), 0.0);
+            va += ripple;
+        }
+    }
+
+    return va;
+}
+
+void main() {
+    vec2 uv = qt_TexCoord0;
+    float iTime = ubuf.time * 0.07;
+
+    // Aspect ratio correction for circular ripples
+    float aspect = ubuf.itemWidth / ubuf.itemHeight;
+    vec2 uvAspect = vec2(uv.x * aspect, uv.y);
+
+    float f = noise(6.0 * uvAspect, iTime) * smoothstep(0.0, 0.2, sin(uv.x * 3.141592) * sin(uv.y * 3.141592));
+
+    // Calculate normal from noise for distortion
+    float normalScale = 0.5;
+    vec2 e = normalScale / vec2(ubuf.itemWidth, ubuf.itemHeight);
+    vec2 eAspect = vec2(e.x * aspect, e.y);
+    float cx = noise(6.0 * (uvAspect + eAspect), iTime) * smoothstep(0.0, 0.2, sin((uv.x + e.x) * 3.141592) * sin(uv.y * 3.141592));
+    float cy = noise(6.0 * (uvAspect + eAspect.yx), iTime) * smoothstep(0.0, 0.2, sin(uv.x * 3.141592) * sin((uv.y + e.y) * 3.141592));
+    vec2 n = vec2(cx - f, cy - f);
+
+    // Scale distortion back to texture space (undo aspect correction for X)
+    vec2 distortion = vec2(n.x / aspect, n.y);
+
+    // Sample source with distortion
+    vec4 col = texture(source, uv + distortion);
+
+    // Apply rounded corner mask
+    vec2 pixelPos = qt_TexCoord0 * vec2(ubuf.itemWidth, ubuf.itemHeight);
+    vec2 center = pixelPos - vec2(ubuf.itemWidth, ubuf.itemHeight) * 0.5;
+    vec2 halfSize = vec2(ubuf.itemWidth, ubuf.itemHeight) * 0.5;
+    float dist = roundedBoxSDF(center, halfSize, ubuf.cornerRadius);
+    float cornerMask = 1.0 - smoothstep(-1.0, 0.0, dist);
+
+    // Output with premultiplied alpha
+    float finalAlpha = col.a * ubuf.qt_Opacity * cornerMask;
+    fragColor = vec4(col.rgb * finalAlpha, finalAlpha);
+}

Shaders/frag/weather_snow.frag

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+#version 450
+
+layout(location = 0) in vec2 qt_TexCoord0;
+layout(location = 0) out vec4 fragColor;
+
+layout(std140, binding = 0) uniform buf {
+    mat4 qt_Matrix;
+    float qt_Opacity;
+    float time;
+    float itemWidth;
+    float itemHeight;
+    vec4 bgColor;
+    float cornerRadius;
+} ubuf;
+
+// Signed distance function for rounded rectangle
+float roundedBoxSDF(vec2 center, vec2 size, float radius) {
+    vec2 q = abs(center) - size + radius;
+    return min(max(q.x, q.y), 0.0) + length(max(q, 0.0)) - radius;
+}
+
+void main() {
+    // Aspect ratio correction
+    float aspect = ubuf.itemWidth / ubuf.itemHeight;
+    vec2 uv = qt_TexCoord0;
+    uv.x *= aspect;
+    uv.y = 1.0 - uv.y;
+
+    float iTime = ubuf.time * 0.15;
+
+    float snow = 0.0;
+
+    for (int k = 0; k < 6; k++) {
+        for (int i = 0; i < 12; i++) {
+            float cellSize = 2.0 + (float(i) * 3.0);
+            float downSpeed = 0.3 + (sin(iTime * 0.4 + float(k + i * 20)) + 1.0) * 0.00008;
+
+            vec2 uvAnim = uv + vec2(
+                0.01 * sin((iTime + float(k * 6185)) * 0.6 + float(i)) * (5.0 / float(i + 1)),
+                downSpeed * (iTime + float(k * 1352)) * (1.0 / float(i + 1))
+            );
+
+            vec2 uvStep = (ceil((uvAnim) * cellSize - vec2(0.5, 0.5)) / cellSize);
+            float x = fract(sin(dot(uvStep.xy, vec2(12.9898 + float(k) * 12.0, 78.233 + float(k) * 315.156))) * 43758.5453 + float(k) * 12.0) - 0.5;
+            float y = fract(sin(dot(uvStep.xy, vec2(62.2364 + float(k) * 23.0, 94.674 + float(k) * 95.0))) * 62159.8432 + float(k) * 12.0) - 0.5;
+
+            float randomMagnitude1 = sin(iTime * 2.5) * 0.7 / cellSize;
+            float randomMagnitude2 = cos(iTime * 1.65) * 0.7 / cellSize;
+
+            float d = 5.0 * distance((uvStep.xy + vec2(x * sin(y), y) * randomMagnitude1 + vec2(y, x) * randomMagnitude2), uvAnim.xy);
+
+            float omiVal = fract(sin(dot(uvStep.xy, vec2(32.4691, 94.615))) * 31572.1684);
+            if (omiVal < 0.03) {
+                float newd = (x + 1.0) * 0.4 * clamp(1.9 - d * (15.0 + (x * 6.3)) * (cellSize / 1.4), 0.0, 1.0);
+                snow += newd;
+            }
+        }
+    }
+
+    // Blend white snow over background color
+    float snowAlpha = clamp(snow * 2.0, 0.0, 1.0);
+    vec3 snowColor = vec3(1.0);
+    vec3 blended = mix(ubuf.bgColor.rgb, snowColor, snowAlpha);
+
+    // Apply rounded corner mask
+    vec2 pixelPos = qt_TexCoord0 * vec2(ubuf.itemWidth, ubuf.itemHeight);
+    vec2 center = pixelPos - vec2(ubuf.itemWidth, ubuf.itemHeight) * 0.5;
+    vec2 halfSize = vec2(ubuf.itemWidth, ubuf.itemHeight) * 0.5;
+    float dist = roundedBoxSDF(center, halfSize, ubuf.cornerRadius);
+    float cornerMask = 1.0 - smoothstep(-1.0, 0.0, dist);
+
+    // Output with premultiplied alpha
+    float finalAlpha = ubuf.qt_Opacity * cornerMask;
+    fragColor = vec4(blended * finalAlpha, finalAlpha);
+}