armorpaint/paint/sources/material_nodes/blur_node.ts

function blur_node_init() {
	array_push(nodes_material_color, blur_node_def);
	map_set(parser_material_node_vectors, "BLUR", blur_node_vector);
}

function blur_node_vector(node: ui_node_t, socket: ui_node_socket_t): string {
	if (parser_material_blur_passthrough) {
		return parser_material_parse_vector_input(node.inputs[0]);
	}
	let strength: string = parser_material_parse_value_input(node.inputs[1]);
	let steps: string    = "(" + strength + " * 10.0 + 1.0)";
	let tex_name: string = "texblur_" + parser_material_node_name(node);
	node_shader_add_texture(parser_material_kong, "" + tex_name, "_" + tex_name);
	node_shader_add_constant(parser_material_kong, "" + tex_name + "_size: float2", "_size(_" + tex_name + ")");
	let store: string = parser_material_store_var_name(node);
	parser_material_write(parser_material_kong, "var " + store + "_res: float3 = float3(0.0, 0.0, 0.0);");
	parser_material_write(parser_material_kong, "for (var i: int = 0; i <= int(" + steps + " * 2.0); i += 1) {");
	parser_material_write(parser_material_kong, "for (var j: int = 0; j <= int(" + steps + " * 2.0); j += 1) {");
	parser_material_write(parser_material_kong, store + "_res += sample(" + tex_name + ", sampler_linear, tex_coord + float2(float(i) - " + steps +
	                                                ", float(j) - " + steps + ") / constants." + tex_name + "_size).rgb;");
	parser_material_write(parser_material_kong, "}");
	parser_material_write(parser_material_kong, "}");
	parser_material_write(parser_material_kong, store + "_res = " + store + "_res / ((" + steps + " * 2.0 + 1.0) * (" + steps + " * 2.0 + 1.0));");
	return store + "_res";
}

let blur_node_def: ui_node_t = {
	id : 0,
	name : _tr("Blur"),
	type : "BLUR", // extension
	x : 0,
	y : 0,
	color : 0xff448c6d,
	inputs : [
		{
			id : 0,
			node_id : 0,
			name : _tr("Color"),
			type : "RGBA",
			color : 0xffc7c729,
			default_value : f32_array_create_xyzw(0.8, 0.8, 0.8, 1.0),
			min : 0.0,
			max : 1.0,
			precision : 100,
			display : 0
		},
		{
			id : 0,
			node_id : 0,
			name : _tr("Strength"),
			type : "VALUE",
			color : 0xffa1a1a1,
			default_value : f32_array_create_x(0.5),
			min : 0.0,
			max : 1.0,
			precision : 100,
			display : 0
		}
	],
	outputs : [ {
		id : 0,
		node_id : 0,
		name : _tr("Color"),
		type : "RGBA",
		color : 0xffc7c729,
		default_value : f32_array_create_xyzw(0.8, 0.8, 0.8, 1.0),
		min : 0.0,
		max : 1.0,
		precision : 100,
		display : 0
	} ],
	buttons : [],
	width : 0,
	flags : 0
};