Pixel-Composer/scripts/node_combine_rgb/node_combine_rgb.gml

function Node_Combine_RGB(_x, _y, _group = noone) : Node_Processor(_x, _y, _group) constructor {
	name = "RGB Combine";
	
	shader = sh_combine_rgb;
	uniform_r = shader_get_sampler_index(shader, "samR");
	uniform_g = shader_get_sampler_index(shader, "samG");
	uniform_b = shader_get_sampler_index(shader, "samB");
	uniform_a = shader_get_sampler_index(shader, "samA");
	
	uniform_usea = shader_get_uniform(shader, "useA");
	uniform_mode = shader_get_uniform(shader, "mode");
	
	inputs[| 0] = nodeValue("Red",   self, JUNCTION_CONNECT.input, VALUE_TYPE.surface, 0);
	inputs[| 1] = nodeValue("Green", self, JUNCTION_CONNECT.input, VALUE_TYPE.surface, 0);
	inputs[| 2] = nodeValue("Blue",  self, JUNCTION_CONNECT.input, VALUE_TYPE.surface, 0);
	inputs[| 3] = nodeValue("Alpha", self, JUNCTION_CONNECT.input, VALUE_TYPE.surface, 0);
	
	inputs[| 4] = nodeValue("Sampling type", self, JUNCTION_CONNECT.input, VALUE_TYPE.integer, 0)
		.setDisplay(VALUE_DISPLAY.enum_scroll, ["Brightness", "Channel value"]);
	
	outputs[| 0] = nodeValue("Surface out", self, JUNCTION_CONNECT.output, VALUE_TYPE.surface, noone);
	
	input_display_list = [
		["Sampling",	false], 4,
		["Output", 		 true], 0, 1, 2, 3,
	]
	
	attribute_surface_depth();
	
	static process_data = function(_outSurf, _data, _output_index, _array_index) {
		var _r = _data[0];
		var _g = _data[1];
		var _b = _data[2];
		var _a = _data[3];
		var _mode = _data[4];
		
		surface_set_target(_outSurf);
		DRAW_CLEAR
		BLEND_OVERRIDE;
		
		shader_set(shader);
			texture_set_stage(uniform_r, surface_get_texture(_r));
			texture_set_stage(uniform_g, surface_get_texture(_g));
			texture_set_stage(uniform_b, surface_get_texture(_b));
			
			shader_set_uniform_i(uniform_mode, _mode);
			shader_set_uniform_i(uniform_usea, is_surface(_a));
			texture_set_stage(uniform_a, surface_get_texture(_a));
			
			draw_sprite_ext(s_fx_pixel, 0, 0, 0, surface_get_width(_outSurf), surface_get_width(_outSurf), 0, c_white, 1);
		shader_reset();
		
		BLEND_NORMAL;
		surface_reset_target();
		
		return _outSurf;
	}
}