SHADER

shader/includes/normal-map.gdshaderinc

@@ -0,0 +1,28 @@
+group_uniforms NormalMap;
+uniform float normal_scale : hint_range(-16,16) = 1.0;
+uniform sampler2D normal_map : hint_normal;
+group_uniforms;
+
+struct NormalData {
+	vec3 vector;
+	vec3 map;
+	float depth;
+};
+
+NormalData normal_map_fragment(
+		vec2 uv,
+		vec3 normal,
+		vec3 tangent,
+		vec3 binormal,
+) {
+	vec3 map = texture(normal_map, uv).rgb;
+	vec3 vector = map;
+	vector.xy = vector.xy * 2.0 - 1.0;
+	vector.z = sqrt(max(0.0, 1.0 - dot(vector.xy, vector.xy)));
+	vec3 ref_normal = normalize(mix(
+			normal,
+			tangent * vector.x + binormal * vector.y + normal * vector.z,
+			normal_scale
+	));
+	return NormalData(vector, map, normal_scale);
+}