mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-24 10:48:53 +01:00
46 lines
1.1 KiB
Go
46 lines
1.1 KiB
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 internal
|
|
|
|
import (
|
|
"image/color"
|
|
"math"
|
|
)
|
|
|
|
func NextPowerOf2(x uint64) uint64 {
|
|
x -= 1
|
|
x |= (x >> 1)
|
|
x |= (x >> 2)
|
|
x |= (x >> 4)
|
|
x |= (x >> 8)
|
|
x |= (x >> 16)
|
|
x |= (x >> 32)
|
|
return x + 1
|
|
}
|
|
|
|
func NextPowerOf2Int(size int) int {
|
|
return int(NextPowerOf2(uint64(size)))
|
|
}
|
|
|
|
func RGBA(clr color.Color) (r, g, b, a float64) {
|
|
cr, cg, cb, ca := clr.RGBA()
|
|
const max = math.MaxUint16
|
|
r = float64(cr) / max
|
|
g = float64(cg) / max
|
|
b = float64(cb) / max
|
|
a = float64(ca) / max
|
|
return
|
|
}
|