mirror of
https://github.com/make-42/hayai.git
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48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
// Copyright 2019 The Oto 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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// +build go1.13
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package oto
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import (
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"reflect"
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"runtime"
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"syscall/js"
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"unsafe"
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)
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func float32SliceToTypedArray(s []float32) (js.Value, func()) {
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h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
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h.Len *= 4
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h.Cap *= 4
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bs := *(*[]byte)(unsafe.Pointer(h))
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a := js.Global().Get("Uint8Array").New(len(bs))
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js.CopyBytesToJS(a, bs)
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runtime.KeepAlive(s)
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buf := a.Get("buffer")
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return js.Global().Get("Float32Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/4), func() {}
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}
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func copyFloat32sToJS(v js.Value, s []float32) {
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h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
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h.Len *= 4
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h.Cap *= 4
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bs := *(*[]byte)(unsafe.Pointer(h))
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js.CopyBytesToJS(v, bs)
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runtime.KeepAlive(s)
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}
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