mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-30 21:58:53 +01:00
37 lines
1.1 KiB
Go
37 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 graphics
|
|
|
|
// InternalImageSize returns a nearest appropriate size as an internal image.
|
|
func InternalImageSize(x int) int {
|
|
// minInternalImageSize is the minimum size of internal images (texture/framebuffer).
|
|
//
|
|
// For example, the image size less than 15 is not supported on some iOS devices.
|
|
// See also: https://stackoverflow.com/questions/15935651
|
|
const minInternalImageSize = 16
|
|
|
|
if x <= 0 {
|
|
panic("graphics: x must be positive")
|
|
}
|
|
if x < minInternalImageSize {
|
|
return minInternalImageSize
|
|
}
|
|
r := 1
|
|
for r < x {
|
|
r <<= 1
|
|
}
|
|
return r
|
|
}
|