Pixel-Composer/scripts/node_alpha_cutoff/node_alpha_cutoff.gml

function Node_Alpha_Cutoff(_x, _y, _group = -1) : Node_Processor(_x, _y, _group) constructor {
	name = "Alpha Cutoff";
	
	inputs[| 0] = nodeValue(0, "Surface in", self, JUNCTION_CONNECT.input, VALUE_TYPE.surface, 0);
	inputs[| 1] = nodeValue(1, "Minimum", self, JUNCTION_CONNECT.input, VALUE_TYPE.float, 0.2, "Any pixel with less alpha (more transparent) than this will be removed.")
		.setDisplay(VALUE_DISPLAY.slider, [0, 1, 0.01]);
	
	outputs[| 0] = nodeValue(0, "Surface out", self, JUNCTION_CONNECT.output, VALUE_TYPE.surface, PIXEL_SURFACE);
	
	static process_data = function(_outSurf, _data, _output_index, _array_index) {
		surface_set_target(_outSurf);
		draw_clear_alpha(0, 0);
		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], 0, 0);
		shader_reset();
		
		BLEND_NORMAL
		surface_reset_target();
		
		return _outSurf;
	}
}