Pixel-Composer/scripts/node_normal/node_normal.gml

function Node_Normal(_x, _y, _group = noone) : Node_Processor(_x, _y, _group) constructor {
	name = "Normal";
	
	newInput(0, nodeValue_Surface("Surface in", self));
	
	newInput(1, nodeValue_Float("Height", self, 1));
	
	newInput(2, nodeValue_Float("Smooth", self, 0, "Include diagonal pixel in normal calculation, which leads to smoother output."))
		.setDisplay(VALUE_DISPLAY.slider, { range : [ 0, 4, 0.1] });
	
	newInput(3, nodeValue_Bool("Active", self, true));
		active_index = 3;
	
	newInput(4, nodeValue_Bool("Normalize", self, true));
	
	newInput(5, nodeValue_Bool("Flip X", self, true));
		
	input_display_list = [ 3,
		["Surfaces", false], 0,
		["Normal",	 false], 1, 2, 5, 4, 
	]
	
	newOutput(0, nodeValue_Output("Surface out", self, VALUE_TYPE.surface, noone));
	
	attribute_surface_depth();
	
	static processData = function(_outSurf, _data, _output_index, _array_index) {
		var _hei = _data[1];
		var _smt = _data[2];
		var _nor = _data[4];
		var _swx = _data[5];
		
		surface_set_shader(_outSurf, sh_normal);
			gpu_set_texfilter(true);
			
			shader_set_f("dimension", surface_get_dimension(_data[0]), surface_get_height_safe(_data[0]));
			shader_set_f("height",    _hei);
			shader_set_f("smooth",    _smt);
			shader_set_i("normal",    _nor);
			shader_set_i("swapx",     _swx);
			
			draw_surface_safe(_data[0]);
			
			gpu_set_texfilter(false);
		surface_reset_shader();
		
		return _outSurf;
	}
}