mirror of
https://github.com/hajimehoshi/ebiten.git
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35 lines
1.2 KiB
Go
35 lines
1.2 KiB
Go
// Copyright 2019 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package jsutil
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import (
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"syscall/js"
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)
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// temporaryBuffer is a temporary buffer used at gl.readPixels or gl.texSubImage2D.
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// The read data is converted to Go's byte slice as soon as possible.
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// To avoid often allocating ArrayBuffer, reuse the buffer whenever possible.
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var temporaryBuffer = js.Global().Get("ArrayBuffer").New(16)
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func TemporaryUint8Array(byteLength int) js.Value {
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if bufl := temporaryBuffer.Get("byteLength").Int(); bufl < byteLength {
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for bufl < byteLength {
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bufl *= 2
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}
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temporaryBuffer = js.Global().Get("ArrayBuffer").New(bufl)
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}
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return js.Global().Get("Uint8Array").New(temporaryBuffer, 0, byteLength)
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}
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