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jsutil: Use a 'writable' TypedArray on go2cpp

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Hajime Hoshi 2020-12-06 02:25:04 +09:00
parent 410766c984
commit b326b76d60
1 changed files with 17 additions and 0 deletions
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17
internal/jsutil/buf_js.go
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@ -18,11 +18,18 @@ import (
"syscall/js" "syscall/js"
) )
// isTypedArrayWritable represents whether TypedArray is writable or not.
// TypedArray's properties are not writable in the Web standard, but are writable with go2cpp.
// This enables to avoid unnecessary allocations of js.Value.
var isTypedArrayWritable = js.Global().Get("go2cpp").Truthy()
// temporaryBuffer is a temporary buffer used at gl.readPixels or gl.texSubImage2D. // temporaryBuffer is a temporary buffer used at gl.readPixels or gl.texSubImage2D.
// The read data is converted to Go's byte slice as soon as possible. // The read data is converted to Go's byte slice as soon as possible.
// To avoid often allocating ArrayBuffer, reuse the buffer whenever possible. // To avoid often allocating ArrayBuffer, reuse the buffer whenever possible.
var temporaryBuffer = js.Global().Get("ArrayBuffer").New(16) var temporaryBuffer = js.Global().Get("ArrayBuffer").New(16)
var uint8ArrayObj js.Value
func TemporaryUint8Array(byteLength int) js.Value { func TemporaryUint8Array(byteLength int) js.Value {
if bufl := temporaryBuffer.Get("byteLength").Int(); bufl < byteLength { if bufl := temporaryBuffer.Get("byteLength").Int(); bufl < byteLength {
for bufl < byteLength { for bufl < byteLength {
@ -30,5 +37,15 @@ func TemporaryUint8Array(byteLength int) js.Value {
} }
temporaryBuffer = js.Global().Get("ArrayBuffer").New(bufl) temporaryBuffer = js.Global().Get("ArrayBuffer").New(bufl)
} }
if isTypedArrayWritable {
if uint8ArrayObj.IsUndefined() {
uint8ArrayObj = js.Global().Get("Uint8Array").New()
println("h")
}
uint8ArrayObj.Set("buffer", temporaryBuffer)
uint8ArrayObj.Set("byteOffset", 0)
uint8ArrayObj.Set("byteLength", byteLength)
return uint8ArrayObj
}
return js.Global().Get("Uint8Array").New(temporaryBuffer, 0, byteLength) return js.Global().Get("Uint8Array").New(temporaryBuffer, 0, byteLength)
} }