yes

modules/wallpaper-engine/effects/blur/shaders/effects/blur_downsample4.frag

@@ -0,0 +1,19 @@
+
+varying vec2 v_TexCoord[4];
+
+uniform sampler2D g_Texture0; // {"hidden":true}
+
+void main() {
+
+	float weight = 0.0;
+	vec4 result = CAST4(0.0);
+	for (int i = 0; i < 4; ++i)
+	{
+		vec4 sample = texSample2D(g_Texture0, v_TexCoord[i]);
+		result += sample * sample.a;
+		weight += sample.a;
+	}
+	
+	gl_FragColor.rgb = result.rgb / max(0.001, weight);
+	gl_FragColor.a = result.a / 4.0;
+}