Pixel-Composer/scripts/node_particle/node_particle.gml

function Node_Particle(_x, _y, _group = noone) : Node_VFX_Spawner_Base(_x, _y, _group) constructor {
	name = "Particle";
	use_cache = CACHE_USE.auto;

	onSurfaceSize = function() { 
		var _inp = getInputData(input_len, DEF_SURF); 
		return [ _inp[0], _inp[1] ];
	};
	
	newInput(input_len + 0, nodeValue_Vec2("Output dimension", self, DEF_SURF));
		
	newInput(input_len + 1, nodeValue_Bool("Round position", self, true, "Round position to the closest integer value to avoid jittering."));
	
	newInput(input_len + 2, nodeValue_Enum_Scroll("Blend mode", self,  0 , [ "Normal", "Alpha", "Additive" ]));
	
	newInput(input_len + 3, nodeValue_Surface("Background", self));
	
	newInput(input_len + 4, nodeValue_Enum_Button("Render Type", self,  PARTICLE_RENDER_TYPE.surface , [ "Surface", "Line" ]));
	
	newInput(input_len + 5, nodeValue_Int("Line life", self, 4 ));
	
	inputs[3].setUnitRef(onSurfaceSize, VALUE_UNIT.reference);
	inputs[3].setDefValue( DEF_AREA_REF );
	
	outputs[0] = nodeValue_Output("Surface out", self, VALUE_TYPE.surface, noone);
	
	for(var i = input_len, n = array_length(inputs); i < n; i++) inputs[i].rejectArray();
	
	attribute_surface_depth();
	attribute_interpolation();
	
	array_insert(        input_display_list, 0,  ["Output", true], input_len + 3, input_len + 0);
	array_push(          input_display_list,     input_len + 1, input_len + 2);
	array_insert_before( input_display_list, 21, [ input_len + 4, input_len + 5 ]);
	
	def_surface    = -1;
	curr_dimension = [ 0, 0 ];
	render_amount  = 0;
	
	insp2UpdateTooltip = "Clear cache";
	insp2UpdateIcon    = [ THEME.cache, 0, COLORS._main_icon ];
	
	static onInspector2Update = function() { clearCache(); }
	
	static onValueUpdate = function(index = 0) {
		if(index == input_len + 0) {
			var _dim		= getInputData(input_len + 0);
			var _outSurf	= outputs[0].getValue();
			
			_outSurf = surface_verify(_outSurf, array_safe_get_fast(_dim, 0, 1), array_safe_get_fast(_dim, 1, 1), attrDepth());
			outputs[0].setValue(_outSurf);
		}
		
		if(IS_PLAYING) clearCache();
	}
	
	static reLoop = function() {
		var _loop = getInputData(21);
		var _type = getInputData(input_len + 4);
		
		if(!_loop) return;
		
		for(var i = 0; i < TOTAL_FRAMES; i++) {
			runVFX(i, _type);
			updateParticleForward();
		}
		
		seed = getInputData(32);
	}
	
	static onStep = function() {
		var _dim = getInputData(input_len + 0);
		var _typ = getInputData(input_len + 4);
		
		inputs[input_len + 5].setVisible(_typ == PARTICLE_RENDER_TYPE.line);
		
		if(curr_dimension[0] != _dim[0] || curr_dimension[1] != _dim[1]) {
			clearCache();
			
			curr_dimension[0] = _dim[0];
			curr_dimension[1] = _dim[1];
		}
	}
	
	static onUpdate = function(frame = CURRENT_FRAME) {
		var _inSurf  = getInputData(0);
		var _dim	 = getInputData(input_len + 0);
		var _bg 	 = getInputData(input_len + 3);
		var _outSurf = outputs[0].getValue();
		
		if(is_surface(_bg)) _dim = surface_get_dimension(_bg)
		
		_outSurf = surface_verify(_outSurf, _dim[0], _dim[1], attrDepth());
		render_amount = 0;		
		
		outputs[0].setValue(_outSurf);
		
		if(IS_FIRST_FRAME) {
			reset();
			if(IS_PLAYING) reLoop();
		}
		
		if(IS_PLAYING) runVFX(frame);
	}
	
	function render(_time = CURRENT_FRAME) {
		var _dim   = inputs[input_len + 0].getValue(_time);
		var _exact = inputs[input_len + 1].getValue(_time);
		var _blend = inputs[input_len + 2].getValue(_time);
		var _bg    = inputs[input_len + 3].getValue(_time);
		
		var _type  = inputs[input_len + 4].getValue(_time);
		var _llife = inputs[input_len + 5].getValue(_time);
		
		var _outSurf = outputs[0].getValue();
		
		if(is_surface(_bg)) _dim = surface_get_dimension(_bg)
		
		surface_set_shader(_outSurf, _type == PARTICLE_RENDER_TYPE.surface? sh_sample : noone);
			if(is_surface(_bg))  draw_surface_safe(_bg);
			
			switch(_blend) {
				case PARTICLE_BLEND_MODE.normal:   BLEND_NORMAL; break;
				case PARTICLE_BLEND_MODE.alpha:    BLEND_ALPHA;  break;
				case PARTICLE_BLEND_MODE.additive: BLEND_ADD;    break;
			}
			
			if(_type == PARTICLE_RENDER_TYPE.surface)
				shader_set_interpolation(_outSurf);
			
			for(var i = 0; i < attributes.part_amount; i++) {
				parts[i].render_type = _type;
				parts[i].line_draw   = _llife;
				
				if(parts[i].active || _type) parts[i].draw(_exact, _dim[0], _dim[1]);
			}
		surface_reset_shader();	
		
		if(PROJECT.animator.is_playing)
			cacheCurrentFrame(_outSurf);
	}	
}