yes

modules/wallpaper-engine/shaders/HLSL/dx11fallback.frag

@@ -0,0 +1,17 @@
+
+struct PS_OUTPUT
+{
+	float4 gl_FragColor : SV_TARGET;
+};
+
+struct VS_OUTPUT
+{
+	float4 gl_Position : SV_POSITION;
+};
+
+PS_OUTPUT main(VS_OUTPUT IN)
+{
+	PS_OUTPUT OUT;
+	OUT.gl_FragColor = float4(0.5, 0, 0, 1);
+	return OUT;
+}