per-pixel wave reveal mask for lock screen overlay layers

shell/modules/reveal_mask.frag

@@ -0,0 +1,21 @@
+#version 440
+
+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 uPhase;
+    float uWidth;
+};
+
+layout(binding = 1) uniform sampler2D source;
+
+void main() {
+    vec4 tex = texture(source, qt_TexCoord0);
+    float x = qt_TexCoord0.x * uWidth;
+    // Soft reveal edge: fully visible 200px behind wave, fades out 50px ahead
+    float mask = 1.0 - smoothstep(uPhase - 200.0, uPhase + 50.0, x);
+    fragColor = tex * mask * qt_Opacity;
+}