ebiten/internal/math/math.go

// Copyright 2014 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package math

// NextPowerOf2Int returns a nearest power of 2 to x.
func NextPowerOf2Int(x int) int {
	if x <= 0 {
		panic("x must be positive")
	}
	r := 1
	for r < x {
		r <<= 1
	}
	return r
}