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slice_js.go
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slice_js.go
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// Copyright 2019 The Ebiten Authors
//
// 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 jsutil
import (
"reflect"
"runtime"
"syscall/js"
"unsafe"
)
func copyUint8SliceToTemporaryArrayBuffer(src []uint8) {
if len(src) == 0 {
return
}
js.CopyBytesToJS(temporaryUint8Array, src)
}
func copyUint16SliceToTemporaryArrayBuffer(src []uint16) {
if len(src) == 0 {
return
}
h := (*reflect.SliceHeader)(unsafe.Pointer(&src))
h.Len *= 2
h.Cap *= 2
bs := *(*[]byte)(unsafe.Pointer(h))
runtime.KeepAlive(src)
js.CopyBytesToJS(temporaryUint8Array, bs)
}
func copyFloat32SliceToTemporaryArrayBuffer(src []float32) {
if len(src) == 0 {
return
}
h := (*reflect.SliceHeader)(unsafe.Pointer(&src))
h.Len *= 4
h.Cap *= 4
bs := *(*[]byte)(unsafe.Pointer(h))
runtime.KeepAlive(src)
js.CopyBytesToJS(temporaryUint8Array, bs)
}