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jsutil: Refactoring

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This commit is contained in:
Hajime Hoshi 2020-12-16 02:41:06 +09:00
parent 7e32075abd
commit e856b236f3
1 changed files with 12 additions and 6 deletions
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18
internal/jsutil/buf_js.go
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@ -18,17 +18,23 @@ import (
"syscall/js"
)
var (
arrayBuffer = js.Global().Get("ArrayBuffer")
uint8Array = js.Global().Get("Uint8Array")
float32Array = js.Global().Get("Float32Array")
)
var (
// temporaryArrayBuffer 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.
// To avoid often allocating ArrayBuffer, reuse the buffer whenever possible.
temporaryArrayBuffer = js.Global().Get("ArrayBuffer").New(16)
temporaryArrayBuffer = arrayBuffer.New(16)
// temporaryUint8Array is a Uint8ArrayBuffer whose underlying buffer is always temporaryArrayBuffer.
temporaryUint8Array = js.Global().Get("Uint8Array").New(temporaryArrayBuffer)
temporaryUint8Array = uint8Array.New(temporaryArrayBuffer)
// temporaryFloat32Array is a Float32ArrayBuffer whose underlying buffer is always temporaryArrayBuffer.
temporaryFloat32Array = js.Global().Get("Float32Array").New(temporaryArrayBuffer)
temporaryFloat32Array = float32Array.New(temporaryArrayBuffer)
)
func ensureTemporaryArrayBufferSize(byteLength int) {
@ -36,13 +42,13 @@ func ensureTemporaryArrayBufferSize(byteLength int) {
for bufl < byteLength {
bufl *= 2
}
temporaryArrayBuffer = js.Global().Get("ArrayBuffer").New(bufl)
temporaryArrayBuffer = arrayBuffer.New(bufl)
}
if temporaryUint8Array.Get("byteLength").Int() < temporaryArrayBuffer.Get("byteLength").Int() {
temporaryUint8Array = js.Global().Get("Uint8Array").New(temporaryArrayBuffer)
temporaryUint8Array = uint8Array.New(temporaryArrayBuffer)
}
if temporaryFloat32Array.Get("byteLength").Int() < temporaryArrayBuffer.Get("byteLength").Int() {
temporaryFloat32Array = js.Global().Get("Float32Array").New(temporaryArrayBuffer)
temporaryFloat32Array = float32Array.New(temporaryArrayBuffer)
}
}