Hue node added

addons/ShaderLib/Artistic/Adjustment/HueNode.gd

@@ -0,0 +1,73 @@
+@tool
+class_name VisualShaderNodeAdjustmentHueNode extends VisualShaderNodeCustom
+
+func _get_name() -> String:
+	return "HueNode"
+
+func _get_category() -> String:
+	return "Artistic/Adjustment"
+
+func _get_description() -> String:
+	return "Offsets the hue of input in by the amount of input offset."
+
+func _get_return_icon_type() -> PortType:
+	return PORT_TYPE_VECTOR_3D
+
+func _get_input_port_count() -> int:
+	return 2
+
+func _get_input_port_name(port: int) -> String:
+	match port:
+		0:
+			return "in"
+		_:
+			return "offset"
+
+func _get_input_port_type(port: int) -> PortType:
+	match port:
+		0:
+			return PORT_TYPE_VECTOR_3D
+		_:
+			return PORT_TYPE_SCALAR
+
+func _get_input_port_default_value(port: int) -> Variant:
+	match port:
+		1:
+			return 0.0
+		_:
+			return null
+
+func _get_output_port_count() -> int:
+	return 1
+
+func _get_output_port_name(port: int) -> String:
+	return "out"
+
+func _get_output_port_type(port: int) -> PortType:
+	return PORT_TYPE_VECTOR_3D
+
+func _get_property_count() -> int:
+	return 1
+
+func _get_property_default_index(index: int) -> int:
+	return 0
+
+func _get_property_name(index: int) -> String:
+	return "Range"
+
+func _get_property_options(index: int) -> PackedStringArray:
+	return ["Degrees", "Normalize"]
+
+func _get_global_code(mode: Shader.Mode) -> String:
+	var code: String = preload("HueNode.gdshaderinc").code
+	return code
+
+func _get_code(input_vars: Array[String], output_vars: Array[String], mode: Shader.Mode, type: VisualShader.Type) -> String:
+	var range_index: int = get_option_index(0)
+	var input: String = "vec3(1.0)"
+	var offset: String = input_vars[1]
+
+	if input_vars[0]:
+		input = input_vars[0]
+
+	return output_vars[0] + " = hue(%s, %s, %s);" % [input, offset, range_index]

addons/ShaderLib/Artistic/Adjustment/HueNode.gdshaderinc

@@ -0,0 +1,27 @@
+vec3 hue(vec3 input, float offset, int range_index){
+    // RGB to HSV
+	vec4 k = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
+    vec4 p = mix(vec4(input.bg, k.wz), vec4(input.gb, k.xy), step(input.b, input.g));
+    vec4 q = mix(vec4(p.xyw, input.r), vec4(input.r, p.yzx), step(p.x, input.r));
+    float d = q.x - min(q.w, q.y);
+    float e = 1.0e-10;
+    vec3 hsv = vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
+
+	offset = (range_index == 0) ? offset / 360.0 : offset;
+    float hue = hsv.x + offset;
+	if(hue < 0.0){
+		hsv.x = hue + 1.;
+	}
+	else if(hue > 1.){
+		hsv.x = hue - 1.;
+	}
+	else{
+		hsv.x = hue;
+	}
+
+	// HSV to RGB
+    vec4 k2 = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
+    vec3 p2 = abs(fract(hsv.xxx + k2.xyz) * 6.0 - k2.www);
+	vec3 rgb = hsv.z * mix(k2.xxx, clamp(p2 - k2.xxx, 0.0, 1.0), hsv.y);
+	return rgb;
+}