Pixel-Composer/scripts/node_atlas/node_atlas.gml

function Node_create_Atlas(_x, _y) {
	var node = new Node_Atlas(_x, _y);
	ds_list_add(PANEL_GRAPH.nodes_list, node);
	return node;
}

function Node_Atlas(_x, _y) : Node_Processor(_x, _y) constructor {
	name = "Atlas";
	
	uniform_dim   = shader_get_uniform(sh_atlas, "dimension");
	
	inputs[| 0] = nodeValue(0, "Surface in",	 self, JUNCTION_CONNECT.input, VALUE_TYPE.surface, 0);
	
	outputs[| 0] = nodeValue(0, "Surface out", self, JUNCTION_CONNECT.output, VALUE_TYPE.surface, PIXEL_SURFACE);
	
	static process_data = function(_outSurf, _data, _output_index) {
		surface_set_target(_outSurf);
		draw_clear_alpha(0, 0);
		BLEND_ADD
		
		shader_set(sh_atlas);
			shader_set_uniform_f_array(uniform_dim, [surface_get_width(_data[0]), surface_get_height(_data[0])]);
			draw_surface_safe(_data[0], 0, 0);
		shader_reset();
		
		BLEND_NORMAL
		surface_reset_target();
		
		return _outSurf;
	}
}