#macro FLUID_DOMAIN_CHECK if(!is_instanceof(group, Node_Fluid_Group)) return; if(!instance_exists(_dom)) _dom = group.domain; if(_dom == noone || !instance_exists(_dom)) return;

function Node_Fluid_Group(_x, _y, _group = noone) : Node_Collection(_x, _y, _group) constructor {
	name  = "FluidSim";
	color = COLORS.node_blend_fluid;
	icon  = THEME.fluid_sim;
	
	ungroupable = false;
	update_on_frame = true;
	
	outputNode = noone;
	
	inputs[| 0] = nodeValue("Dimension", self, JUNCTION_CONNECT.input, VALUE_TYPE.integer, DEF_SURF)
		.setDisplay(VALUE_DISPLAY.vector);
	
	inputs[| 1] = nodeValue("Collision", self, JUNCTION_CONNECT.input, VALUE_TYPE.surface, noone);
	
	inputs[| 2] = nodeValue("Material dissipation type", self, JUNCTION_CONNECT.input, VALUE_TYPE.integer, 1)
		.setDisplay(VALUE_DISPLAY.enum_button, [ "Multiply", "Subtract" ]);
	
	inputs[| 3] = nodeValue("Material dissipation", self, JUNCTION_CONNECT.input, VALUE_TYPE.float, 0.02)
		.setDisplay(VALUE_DISPLAY.slider, { range: [ 0, 0.1, 0.01 ] });
	
	inputs[| 4] = nodeValue("Velocity dissipation type", self, JUNCTION_CONNECT.input, VALUE_TYPE.integer, 1)
		.setDisplay(VALUE_DISPLAY.enum_button, [ "Multiply", "Subtract" ]);
	
	inputs[| 5] = nodeValue("Velocity dissipation", self, JUNCTION_CONNECT.input, VALUE_TYPE.float, 0.00)
		.setDisplay(VALUE_DISPLAY.slider, { range: [ 0, 0.1, 0.01 ] });
	
	inputs[| 6] = nodeValue("Acceleration", self, JUNCTION_CONNECT.input, VALUE_TYPE.float, [ 0, 0 ])
		.setDisplay(VALUE_DISPLAY.vector);
	
	inputs[| 7] = nodeValue("Material intertia", self, JUNCTION_CONNECT.input, VALUE_TYPE.float, [ 1, -0.2 ])
		.setDisplay(VALUE_DISPLAY.vector);
	
	inputs[| 8] = nodeValue("Initial pressure", self, JUNCTION_CONNECT.input, VALUE_TYPE.float, 0.75)
		.setDisplay(VALUE_DISPLAY.slider);
	
	inputs[| 9] = nodeValue("Material Maccormack weight", self, JUNCTION_CONNECT.input, VALUE_TYPE.float, 1)
		.setDisplay(VALUE_DISPLAY.slider);
	
	inputs[| 10] = nodeValue("Velocity Maccormack weight", self, JUNCTION_CONNECT.input, VALUE_TYPE.float, 0)
		.setDisplay(VALUE_DISPLAY.slider);
	
	inputs[| 11] = nodeValue("Wrap", self, JUNCTION_CONNECT.input, VALUE_TYPE.boolean, false);
	
	input_display_list_def = [ 
		["Domain",		false], 0, 11, 1,
		["Properties",	false], 8, 6, 7,
		["Dissipation",	false], 2, 3, 4, 5,
		["Huh?",		 true], 9, 10, 
		["Inputs",		false], 
	];
	
	custom_input_index = ds_list_size(inputs);
	
	domain = fd_rectangle_create(PROJECT.attributes.surface_dimension[0], PROJECT.attributes.surface_dimension[1]);
	
	if(!LOADING && !APPENDING && !CLONING) {
		var _render = nodeBuild("Node_Fluid_Render_Output",  128, -32, self);
	}
	
	static update = function() {
		for( var i = 0, n = ds_list_size(nodes); i < n; i++ ) {
			var node = nodes[| i];
			
			if(!is_instanceof(node, Node_Fluid_Render)) continue;
			if(node.cacheExist()) node.cachedPropagate();
		}
		
		var _dim	= getInputData( 0);
		var coll	= getInputData( 1);
		var mdisTyp = getInputData( 2);
		var mdis    = getInputData( 3);
		var vdisTyp = getInputData( 4);
		var vdis    = getInputData( 5);
		var acc     = getInputData( 6);
		var matInr  = getInputData( 7);
		var inPress = getInputData( 8);
		var mMac	= getInputData( 9);
		var vMac	= getInputData(10);
		var wrap	= getInputData(11);
		
		if(PROJECT.animator.current_frame == 0 || !is_surface(domain.sf_world)) {
			fd_rectangle_clear(domain);
			fd_rectangle_destroy(domain);
			domain = fd_rectangle_create(_dim[0], _dim[1]);
			
			fd_rectangle_set_visualization_shader(domain, FD_VISUALIZATION_SHADER.COLORIZE);
			fd_rectangle_set_material_type(domain, FD_MATERIAL_TYPE.A_16);
			fd_rectangle_set_velocity_time_step(domain, 1);
			fd_rectangle_set_material_time_step(domain, 1);
			
	        fd_rectangle_set_pressure_iteration_type(domain, -2);
			fd_rectangle_set_initial_value_pressure(domain, inPress);
		}
		
		surface_set_target(domain.sf_world);
			draw_clear_alpha($00FFFF, 0);
			if(is_surface(coll)) draw_surface_stretched_safe(coll, 0, 0, _dim[0], _dim[1]);
		surface_reset_target();
		
		fd_rectangle_set_material_dissipation_type(domain, mdisTyp);
		fd_rectangle_set_material_dissipation_value(domain, mdis);
		
		fd_rectangle_set_velocity_dissipation_type(domain, vdisTyp);
		fd_rectangle_set_velocity_dissipation_value(domain, vdis);
			
		fd_rectangle_set_acceleration(domain, acc[0], acc[1], matInr[0], matInr[1]);
		
		fd_rectangle_set_velocity_maccormack_weight(domain, vMac);
	    fd_rectangle_set_material_maccormack_weight(domain, mMac);
		
		fd_rectangle_set_repeat(domain, wrap);
	}
	
	static getAnimationCacheExist = function(frame) { 
		if(outputNode == noone) return false;
		return outputNode.cacheExist(frame); 
	}
	
	PATCH_STATIC
}