SHADER

shader/includes/base-cel-shader.gdshaderinc

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+global uniform sampler2D diffuse_curve: repeat_disable;
+global uniform float specular_smoothness;
+global uniform float fresnel_smoothness;
+
+ float diffuse_sample(vec3 light, vec3 normal) {
+	return texture(diffuse_curve, vec2(dot(light, normal), 0)
+	).r;
+ }
+
+float is_lit(vec3 light, vec3 normal, float attenuation) {
+	return attenuation * diffuse_sample(light, normal);
+}
+
+vec3 diffuse_light(
+		vec3 albedo,
+		vec3 light_color,
+		vec3 light,
+		vec3 normal,
+		float attenuation
+) {
+	return albedo * light_color * is_lit(light, normal, attenuation);
+}
+
+vec3 specular_light(
+		vec3 light_color,
+		vec3 specular_color,
+		float specular_strength,
+		vec3 normal,
+		vec3 view,
+		vec3 light,
+		float attenuation
+) {
+	vec3 half = normalize(view + light);
+	float gloss = pow(2.0, 8.0 * (1.0 - specular_strength));
+	float intensity = pow(dot(normal, half), gloss * gloss);
+	return light_color
+			* specular_color
+			* is_lit(light, normal, attenuation)
+			* smoothstep(
+					0.05,
+					0.05 + specular_smoothness,
+					intensity
+			);
+}
+
+vec3 fresnel_light(
+		vec3 light_color,
+		vec3 fresnel_color,
+		float fresnel_strength,
+		vec3 normal,
+		vec3 view,
+		vec3 light,
+		float attenuation
+) {
+	float fresnel_dot = 1.0 - dot(normal, view);
+	float fresnel_threshold = pow((1.0 - fresnel_strength), dot(light, normal));
+	return light_color
+			* fresnel_color
+			* is_lit(light, normal, attenuation)
+			* smoothstep(
+					fresnel_threshold - fresnel_smoothness / 2.0,
+					fresnel_threshold + fresnel_smoothness / 2.0,
+					fresnel_dot
+			);
+}