Saturation node added

addons/ShaderLib/Artistic/Adjustment/Saturation.gd

@@ -0,0 +1,61 @@
+@tool
+class_name VisualShaderNodeAdjustmentSaturation extends VisualShaderNodeCustom
+
+
+func _get_name() -> String:
+	return "Saturation"
+
+func _get_category() -> String:
+	return "Artistic/Adjustment"
+
+func _get_description() -> String:
+	return "Adjusts the saturation of input \"in\" by the amount of input \"saturation\"."
+
+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 "saturation"
+
+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:
+		0:
+			return null
+		_:
+			return 1.0
+
+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_global_code(mode: Shader.Mode) -> String:
+	var code: String = preload("Saturation.gdshaderinc").code
+	return code
+
+func _get_code(input_vars: Array[String], output_vars: Array[String], mode: Shader.Mode, type: VisualShader.Type) -> String:
+	var input: String = "vec3(1.0)"
+
+	if input_vars[0]:
+		input = input_vars[0]
+
+	var saturation = input_vars[1]
+	return output_vars[0] + " = saturation(%s, %s);" % [input, saturation]

addons/ShaderLib/Artistic/Adjustment/Saturation.gdshaderinc

@@ -0,0 +1,4 @@
+vec3 saturation(vec3 input, float saturation){
+    float luma = dot(input, vec3(0.2126729, 0.7151522, 0.0721750));
+    return luma + saturation * (input - vec3(luma));
+}

documentation/Documentation.md

@@ -12,6 +12,7 @@ Delete the contents of **_addons/ShaderLib_** folder from your project. Make sur
 <h4><a href="/documentation/Nodes/Artistic/Adjustment/ContrastNode.md">&emsp;&emsp;Contrast node</a></h4>
 <h4><a href="/documentation/Nodes/Artistic/Adjustment/HueNode.md">&emsp;&emsp;Hue node</a></h4>
 <h4><a href="/documentation/Nodes/Artistic/Adjustment/ReplaceColorNode.md">&emsp;&emsp;Replace Color node</a></h4>
+<h4><a href="/documentation/Nodes/Artistic/Adjustment/SaturationNode.md">&emsp;&emsp;Saturation node</a></h4>
 
 <h2>Geometry nodes</h2>
 

documentation/Nodes/Artistic/Adjustment/SaturationNode.md

@@ -0,0 +1,15 @@
+# Saturation node
+Adjusts the saturation of input <b><i>in</i></b> by the amount of input <b><i>saturation</i></b>. A Saturation value of 1 will return the input unaltered. A Saturation value of 0 will return the input completely desaturated.
+<hr>
+
+**Inputs**
+|Name|Type|Binding|Description|
+|---|---|---|---|
+|in|vec3|none|Input value|
+|saturation|float|none|Saturation value|
+  
+**Outputs**
+|Name|Type|Binding|Description|
+|---|---|---|---|
+|out|vec3|None|Output value|
+___