SHADER

shader/includes/anisotropy.gdshaderinc

@@ -0,0 +1,54 @@
+#include "base-cel-shader.gdshaderinc"
+
+group_uniforms Anisotropy;
+uniform float anisotropy_ratio: hint_range(-1,1) = 0.0;
+uniform vec3 anisotropy_direction = vec3(0.0, -1.0, 0.0);
+uniform float aniso_map_dir_ratio: hint_range(0,1) = 0.0;
+uniform sampler2D anisotropy_flowmap: hint_anisotropy;
+group_uniforms;
+
+varying vec3 ANISOTROPY_DIR;
+varying float ANISOTROPY_RATIO;
+
+struct AnisotropyData {
+	vec3 direction;
+	float ratio;
+};
+
+AnisotropyData anisotropy_fragment(vec2 uv) {
+	return AnisotropyData(
+			mix(
+					normalize(anisotropy_direction),
+					texture(anisotropy_flowmap, uv).rgb * 2.0 - 1.0,
+					aniso_map_dir_ratio
+			),
+			anisotropy_ratio * texture(anisotropy_flowmap, uv).a
+	);
+}
+
+vec3 anisotropy_specular(
+		vec3 light_color,
+		vec3 specular_color,
+		float specular_strength,
+		vec3 normal,
+		vec3 view,
+		vec3 light,
+		float attenuation,
+		vec2 uv,
+		vec3 aniso_dir,
+		float aniso_ratio
+) {
+	vec3 half = normalize(view + light);
+	float aniso = max(0, sin(dot(normalize(normal + aniso_dir), half) * PI));
+	float spec = mix(dot(normal, half), aniso, aniso_ratio);
+	float spec_gloss = pow(2.0, 8.0 * (1.0 - specular_strength));
+	float spec_intensity = smoothstep(
+			0.05,
+			0.05 + specular_smoothness,
+			pow(spec, spec_gloss * spec_gloss)
+	);
+	return light_color
+			* specular_color
+			* spec_intensity
+			* is_lit(light, normal, attenuation);
+}