Pixel-Composer/scripts/node_alpha_cutoff/node_alpha_cutoff.gml

function Node_Alpha_Cutoff(_x, _y, _group = noone) : Node_Processor(_x, _y, _group) constructor {
	name = "Alpha Cutoff";
	
	newInput(0, nodeValue_Surface("Surface in", self));
	
	inputs[1] = nodeValue_Float("Minimum", self, 0.2, "Any pixel with less alpha (more transparent) than this will be removed.")
		.setDisplay(VALUE_DISPLAY.slider);
	
	newInput(2, nodeValue_Surface("Mask", self));
	
	inputs[3] = nodeValue_Float("Mix", self, 1)
		.setDisplay(VALUE_DISPLAY.slider);
	
	newInput(4, nodeValue_Bool("Active", self, true));
		active_index = 4;
	
	__init_mask_modifier(2); // inputs 5, 6, 
	
	input_display_list = [ 4, 
		["Surfaces", true], 0, 2, 3, 5, 6, 
		["Cutoff",	false], 1, 
	]
	
	outputs[0] = nodeValue_Output("Surface out", self, VALUE_TYPE.surface, noone);
	
	attribute_surface_depth();
	
	static step = function() { #region
		__step_mask_modifier();
	} #endregion
	
	static processData = function(_outSurf, _data, _output_index, _array_index) { #region	
		surface_set_target(_outSurf);
		DRAW_CLEAR
		BLEND_OVERRIDE;
		
		shader_set(sh_alpha_cutoff);
			shader_set_uniform_f(shader_get_uniform(sh_alpha_cutoff, "cutoff"), _data[1]);
			draw_surface_safe(_data[0]);
		shader_reset();
		
		BLEND_NORMAL;
		surface_reset_target();
		
		__process_mask_modifier(_data);
		_outSurf = mask_apply(_data[0], _outSurf, _data[2], _data[3]);
		
		return _outSurf;
	} #endregion
}