mirror of
https://github.com/autc04/Retro68.git
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105 lines
3.2 KiB
Go
105 lines
3.2 KiB
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build js,wasm
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package js
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import (
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"sync"
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"unsafe"
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)
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var (
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int8Array = Global().Get("Int8Array")
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int16Array = Global().Get("Int16Array")
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int32Array = Global().Get("Int32Array")
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uint8Array = Global().Get("Uint8Array")
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uint16Array = Global().Get("Uint16Array")
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uint32Array = Global().Get("Uint32Array")
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float32Array = Global().Get("Float32Array")
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float64Array = Global().Get("Float64Array")
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)
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var _ Wrapper = TypedArray{} // TypedArray must implement Wrapper
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// TypedArray represents a JavaScript typed array.
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type TypedArray struct {
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Value
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}
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// Release frees up resources allocated for the typed array.
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// The typed array and its buffer must not be accessed after calling Release.
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func (a TypedArray) Release() {
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openTypedArraysMutex.Lock()
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delete(openTypedArrays, a)
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openTypedArraysMutex.Unlock()
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}
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var (
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openTypedArraysMutex sync.Mutex
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openTypedArrays = make(map[TypedArray]interface{})
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)
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// TypedArrayOf returns a JavaScript typed array backed by the slice's underlying array.
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//
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// The supported types are []int8, []int16, []int32, []uint8, []uint16, []uint32, []float32 and []float64.
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// Passing an unsupported value causes a panic.
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//
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// TypedArray.Release must be called to free up resources when the typed array will not be used any more.
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func TypedArrayOf(slice interface{}) TypedArray {
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a := TypedArray{typedArrayOf(slice)}
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openTypedArraysMutex.Lock()
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openTypedArrays[a] = slice
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openTypedArraysMutex.Unlock()
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return a
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}
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func typedArrayOf(slice interface{}) Value {
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switch slice := slice.(type) {
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case []int8:
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if len(slice) == 0 {
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return int8Array.New(memory.Get("buffer"), 0, 0)
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}
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return int8Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice))
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case []int16:
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if len(slice) == 0 {
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return int16Array.New(memory.Get("buffer"), 0, 0)
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}
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return int16Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice))
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case []int32:
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if len(slice) == 0 {
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return int32Array.New(memory.Get("buffer"), 0, 0)
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}
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return int32Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice))
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case []uint8:
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if len(slice) == 0 {
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return uint8Array.New(memory.Get("buffer"), 0, 0)
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}
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return uint8Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice))
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case []uint16:
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if len(slice) == 0 {
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return uint16Array.New(memory.Get("buffer"), 0, 0)
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}
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return uint16Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice))
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case []uint32:
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if len(slice) == 0 {
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return uint32Array.New(memory.Get("buffer"), 0, 0)
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}
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return uint32Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice))
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case []float32:
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if len(slice) == 0 {
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return float32Array.New(memory.Get("buffer"), 0, 0)
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}
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return float32Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice))
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case []float64:
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if len(slice) == 0 {
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return float64Array.New(memory.Get("buffer"), 0, 0)
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}
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return float64Array.New(memory.Get("buffer"), unsafe.Pointer(&slice[0]), len(slice))
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default:
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panic("TypedArrayOf: not a supported slice")
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}
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}
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