Parallax mapping node initial implementation

addons/ShaderLib/UV/ParallaxMappingUV.gd

@@ -0,0 +1,56 @@
+@tool
+class_name VisualShaderNodeUVParallaxMapping extends VisualShaderNodeCustom
+
+func _init() -> void:
+	_set_input_port_default_value(1, 1.0)
+
+func _get_name() -> String:
+	return "ParallaxMapping"
+
+func _get_category() -> String:
+	return "UV"
+
+func _get_description() -> String:
+	return "The Parallax Mapping node lets you create a parallax effect that displaces a Material's UVs to create the illusion of depth inside a Material."
+
+func _get_return_icon_type() -> VisualShaderNode.PortType:
+	return PORT_TYPE_VECTOR_2D
+
+func _get_input_port_count() -> int:
+	return 2
+
+func _get_input_port_name(port: int) -> String:
+	match port:
+		0:
+			return "heightMap"
+		1:
+			return "amplitude"
+	return ""
+
+func _get_input_port_type(port: int) -> VisualShaderNode.PortType:
+	match port:
+		0:
+			return PORT_TYPE_SAMPLER
+		_:
+			return PORT_TYPE_SCALAR
+
+func _get_output_port_count() -> int:
+	return 1
+
+func _get_output_port_name(port: int) -> String:
+	return "uv"
+
+func _get_output_port_type(port: int) -> VisualShaderNode.PortType:
+	return PORT_TYPE_VECTOR_2D
+
+func _get_global_code(mode: Shader.Mode) -> String:
+	var code: String = preload("ParallaxMappingUV.gdshaderinc").code
+	return code
+
+func _get_code(input_vars: Array[String], output_vars: Array[String], mode: Shader.Mode, type: VisualShader.Type) -> String:
+	var height_map: String = input_vars[0]
+	var amplitude: String = input_vars[1]
+	if !height_map:
+		return output_vars[0] + " = UV;"
+
+	return output_vars[0] + " = parallax_mapping_uv(%s, %s, CAMERA_DIRECTION_WORLD, INV_VIEW_MATRIX, UV);" % [height_map, amplitude];

addons/ShaderLib/UV/ParallaxMappingUV.gdshaderinc

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+vec2 parallax_mapping_uv(sampler2D height_map, float bump_scale, vec3 view_direction, mat4 inv_view_matrix, vec2 uv){
+	vec3 _eye = -(inv_view_matrix * vec4(view_direction, 0.0)).xyz;
+	_eye = normalize(view_direction);
+	float _depth = texture(height_map, uv).w;
+	vec2 _half_offset = normalize(_eye).xy * (_depth) * bump_scale;
+	_depth = (_depth + texture(height_map, uv + _half_offset).x) * 0.5;
+	_half_offset = normalize(_eye).xy * (_depth) * bump_scale;
+	_depth = (_depth + texture(height_map, uv + _half_offset).x) * 0.5;
+	_half_offset = normalize(_eye).xy * (_depth) * bump_scale;
+	return uv + _half_offset;
+}