function function_return( mode ) {
	var gpu = new GPU({ mode: mode });
	var f = gpu.createKernel(function() {
		return 42.0;
	}, {
    output : [1]
	});
	QUnit.assert.ok( f !== null, "function generated test");
	QUnit.assert.close(f()[0], 42.0, 0.01, "basic return function test");
}

QUnit.test( "function_return (auto)", function() {
	function_return(null);
});

QUnit.test( "function_return (WebGL)", function() {
	function_return("webgl");
});

QUnit.test( "function_return (CPU)", function() {
	function_return("cpu");
});