function Node_Level(_x, _y, _group = -1) : Node_Processor(_x, _y, _group) constructor {
	name = "Level";
	
	shader = sh_level;
	uniform_wmin = shader_get_uniform(shader, "wmin");
	uniform_wmax = shader_get_uniform(shader, "wmax");
	uniform_rmin = shader_get_uniform(shader, "rmin");
	uniform_rmax = shader_get_uniform(shader, "rmax");
	uniform_gmin = shader_get_uniform(shader, "gmin");
	uniform_gmax = shader_get_uniform(shader, "gmax");
	uniform_bmin = shader_get_uniform(shader, "bmin");
	uniform_bmax = shader_get_uniform(shader, "bmax");
	uniform_amin = shader_get_uniform(shader, "amin");
	uniform_amax = shader_get_uniform(shader, "amax");
	
	inputs[| 0] = nodeValue(0, "Surface in", self, JUNCTION_CONNECT.input, VALUE_TYPE.surface, 0);
	
	inputs[| 1] = nodeValue(1, "White",   self, JUNCTION_CONNECT.input, VALUE_TYPE.float, [0, 1])
		.setDisplay(VALUE_DISPLAY.slider_range, [ 0, 1, 0.01]);
	
	inputs[| 2] = nodeValue(2, "Red",   self, JUNCTION_CONNECT.input, VALUE_TYPE.float, [0, 1])
		.setDisplay(VALUE_DISPLAY.slider_range, [ 0, 1, 0.01]);
	
	inputs[| 3] = nodeValue(3, "Green",   self, JUNCTION_CONNECT.input, VALUE_TYPE.float, [0, 1])
		.setDisplay(VALUE_DISPLAY.slider_range, [ 0, 1, 0.01]);
	
	inputs[| 4] = nodeValue(4, "Blue",   self, JUNCTION_CONNECT.input, VALUE_TYPE.float, [0, 1])
		.setDisplay(VALUE_DISPLAY.slider_range, [ 0, 1, 0.01]);
	
	inputs[| 5] = nodeValue(5, "Alpha",   self, JUNCTION_CONNECT.input, VALUE_TYPE.float, [0, 1])
		.setDisplay(VALUE_DISPLAY.slider_range, [ 0, 1, 0.01]);
	
	outputs[| 0] = nodeValue(0, "Surface out", self, JUNCTION_CONNECT.output, VALUE_TYPE.surface, PIXEL_SURFACE);
	
	level_renderer = new Inspector_Custom_Renderer(function(_x, _y, _w, _m, _hover, _focus) {
		var _h = 128;
		var x0 = _x;
		var x1 = _x + _w;
		var y0 = _y;
		var y1 = _y + _h; 
		level_renderer.h = 128;
		
		draw_set_color(COLORS.node_level_shade);
		var _wh = inputs[| 1].getValue();
		var _wmin = min(_wh[0], _wh[1]);
		var _wmax = max(_wh[0], _wh[1]);
		
		draw_rectangle(x0, y0, x0 + max(0, _wmin) * _w, y1, false);
		draw_rectangle(x0 + min(1, _wmax) * _w, y0, x1, y1, false);
		
		for( var i = 0; i < 4; i++ ) {
			var _bx = x1 - 20 - i * 24;
			var _by = y0;
			
			if(buttonInstant(THEME.button_hide, _bx, _by, 20, 20, _m, _focus, _hover) == 2) 
				histShow[i] = !histShow[i];
			draw_sprite_ui_uniform(THEME.circle, 0, _bx + 10, _by + 10, 1, COLORS.histogram[i], 0.5 + histShow[i] * 0.5);
		}
		
		if(histMax > 0)
			histogramDraw(x0, y1, _w, _h);

		draw_set_color(COLORS.node_level_outline);
		draw_rectangle(x0, y0, x1, y1, true);
	});
	
	input_display_list = [
		level_renderer,
		["Level",	false],	0, 1,
		["Channel",	true],	2, 3, 4, 5
	];
	histogramInit();
	
	static onInspect = function() {
		if(array_length(current_data) > 0)
			histogramUpdate(current_data[0]);
	}
	
	static onValueUpdate = function(index) {
		if(index == 0) {
			update();
			if(array_length(current_data) > 0)
				histogramUpdate(current_data[0]);
		}
	}
	
	static process_data = function(_outSurf, _data, _output_index, _array_index) {
		var _wmin = min(_data[1][0], _data[1][1]);
		var _wmax = max(_data[1][0], _data[1][1]);
		var _rmin = min(_data[2][0], _data[2][1]);
		var _rmax = max(_data[2][0], _data[2][1]);
		var _gmin = min(_data[3][0], _data[3][1]);
		var _gmax = max(_data[3][0], _data[3][1]);
		var _bmin = min(_data[4][0], _data[4][1]);
		var _bmax = max(_data[4][0], _data[4][1]);
		var _amin = min(_data[5][0], _data[5][1]);
		var _amax = max(_data[5][0], _data[5][1]);
		
		surface_set_target(_outSurf);
		draw_clear_alpha(0, 0);
		BLEND_OVER
		
		shader_set(shader);
			shader_set_uniform_f(uniform_wmin, _wmin);
			shader_set_uniform_f(uniform_wmax, _wmax);
			shader_set_uniform_f(uniform_rmin, _rmin);
			shader_set_uniform_f(uniform_rmax, _rmax);
			shader_set_uniform_f(uniform_gmin, _gmin);
			shader_set_uniform_f(uniform_gmax, _gmax);
			shader_set_uniform_f(uniform_bmin, _bmin);
			shader_set_uniform_f(uniform_bmax, _bmax);
			shader_set_uniform_f(uniform_amin, _amin);
			shader_set_uniform_f(uniform_amax, _amax);
			
			draw_surface_safe(_data[0], 0, 0);
		shader_reset();
		
		BLEND_NORMAL
		surface_reset_target();
		
		return _outSurf;
	}
}