init

addons/godot-xr-tools/effects/vignette.gdshader

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+shader_type spatial;
+render_mode depth_test_disabled, skip_vertex_transform, unshaded, cull_disabled;
+
+uniform vec4 color : source_color = vec4(0.0, 0.0, 0.0, 1.0);
+uniform float radius = 1.0;
+uniform float fade = 0.05;
+
+varying float dist;
+
+void vertex() {
+	vec2 v = VERTEX.xy;
+	dist = length(v);
+
+	// outer ring is 2.0, inner ring is 1.0, so this scales purely the inner ring
+	if (dist < 1.5) {
+		// Adjust by radius
+		dist = radius;
+		v *= dist;
+
+		// We don't know our eye center, projecting a center point in the distance gives us a good enough approximation
+		vec4 eye = PROJECTION_MATRIX * vec4(0.0, 0.0, 100.0, 1.0);
+
+		// and we offset our inner circle
+		v += eye.xy / eye.w;
+	}
+
+	float z = PROJECTION_MATRIX[2][2] < 0.0 ? 0.0 : 1.0;
+	POSITION = vec4(v, z, 1.0);
+}
+
+void fragment() {
+	ALBEDO = color.rgb;
+	ALPHA = clamp((dist - radius) / fade, 0.0, 1.0);
+}