shader step 2: hex grid with gradient colors and wave animation

modules/OverviewBackdrop.qml

@@ -25,9 +25,31 @@ PanelWindow {
         color: M.Theme.base01
     }
 
-    // Step 1: minimal shader test — should show solid red
     ShaderEffect {
+        id: fx
         anchors.fill: parent
         fragmentShader: Quickshell.shellPath("modules/hex_wave.frag.qsb")
+
+        property real uSize: 50.0
+        property real uWavePhase: -200
+        property vector4d uResolution: Qt.vector4d(width, height, 0, 0)
+        property color uC0: M.Theme.base0C
+        property color uC1: M.Theme.base0E
+        property color uC2: M.Theme.base09
+
+        // Wave animation: 6s sweep + 8s pause
+        SequentialAnimation on uWavePhase {
+            loops: Animation.Infinite
+            running: true
+            NumberAnimation {
+                from: -200
+                to: fx.width + 200
+                duration: 6000
+                easing.type: Easing.InOutSine
+            }
+            PauseAnimation {
+                duration: 8000
+            }
+        }
     }
 }

modules/hex_wave.frag

@@ -6,8 +6,66 @@ layout(location = 0) out vec4 fragColor;
 layout(std140, binding = 0) uniform buf {
     mat4 qt_Matrix;
     float qt_Opacity;
+    float uSize;
+    float uWavePhase;
+    vec4 uResolution;
+    vec4 uC0;
+    vec4 uC1;
+    vec4 uC2;
 };
 
-void main() {
-    fragColor = vec4(1.0, 0.0, 0.0, 0.5) * qt_Opacity;
+float sdHexFlat(vec2 p, float r) {
+    const vec3 k = vec3(0.5, 0.8660254, 0.5773503);
+    p = abs(p);
+    p -= 2.0 * min(dot(k.yx, p), 0.0) * k.yx;
+    p -= vec2(clamp(p.x, -k.z * r, k.z * r), r);
+    return length(p) * sign(p.y);
+}
+
+void main() {
+    vec2 res = uResolution.xy;
+    vec2 frag = qt_TexCoord0 * res;
+
+    float dx = uSize * 1.5;
+    float dy = uSize * 1.7320508;
+
+    float col = round(frag.x / dx);
+    float yoff = mod(col, 2.0) != 0.0 ? dy * 0.5 : 0.0;
+    float row = round((frag.y - yoff) / dy);
+    vec2 center = vec2(col * dx, row * dy + yoff);
+
+    // Wave factor
+    float dist = center.x - uWavePhase;
+    float wf = exp(-dist * dist / 9000.0);
+
+    float baseR = uSize * 0.48;
+    float inradius = baseR * (1.0 + 0.35 * wf);
+
+    vec2 p = frag - center;
+    float d = sdHexFlat(p, inradius);
+    if (d > 0.0) {
+        fragColor = vec4(0.0);
+        return;
+    }
+
+    // Gradient color
+    float fx = clamp(center.x / res.x, 0.0, 1.0);
+    vec3 rgb = fx < 0.5
+        ? mix(uC0.rgb, uC1.rgb, fx * 2.0)
+        : mix(uC1.rgb, uC2.rgb, (fx - 0.5) * 2.0);
+
+    // Alpha from distance to center
+    float fy = clamp(center.y / res.y, 0.0, 1.0);
+    float dc = length(vec2(fx - 0.5, fy - 0.5));
+    float a = 0.03 + dc * 0.06;
+
+    // Wave brighten
+    rgb = min(rgb + vec3(0.3 * wf), vec3(1.0));
+    a += 0.12 * wf;
+
+    // Anti-alias
+    float aa = 1.0 - smoothstep(-1.0, 0.0, d);
+    a *= aa;
+
+    fragColor = vec4(rgb * a, a) * qt_Opacity;
 }