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jsutil: Reduce calls of (js.Value).Get

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(js.Value).Get invokes the string conversion from UTF-8 to UTF-16.
This is related to #1438, though this is not a fix in the OpenGL
driver.

Updates #1438
This commit is contained in:
Hajime Hoshi 2020-12-26 05:12:02 +09:00
parent 517cf29ddc
commit e95cccad21
1 changed files with 13 additions and 6 deletions
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19
internal/jsutil/buf_js.go
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@ -28,27 +28,34 @@ 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 = arrayBuffer.New(16)
temporaryArrayBuffer = arrayBuffer.New(16)
temporaryArrayBufferByteLength = temporaryArrayBuffer.Get("byteLength")
// temporaryUint8Array is a Uint8ArrayBuffer whose underlying buffer is always temporaryArrayBuffer.
temporaryUint8Array = uint8Array.New(temporaryArrayBuffer)
temporaryUint8Array = uint8Array.New(temporaryArrayBuffer)
temporaryUint8ArrayByteLength = temporaryUint8Array.Get("byteLength")
// temporaryFloat32Array is a Float32ArrayBuffer whose underlying buffer is always temporaryArrayBuffer.
temporaryFloat32Array = float32Array.New(temporaryArrayBuffer)
temporaryFloat32Array = float32Array.New(temporaryArrayBuffer)
temporaryFloat32ArrayByteLength = temporaryFloat32Array.Get("byteLength")
)
func ensureTemporaryArrayBufferSize(byteLength int) {
if bufl := temporaryArrayBuffer.Get("byteLength").Int(); bufl < byteLength {
bufl := temporaryArrayBufferByteLength.Int()
if bufl < byteLength {
for bufl < byteLength {
bufl *= 2
}
temporaryArrayBuffer = arrayBuffer.New(bufl)
temporaryArrayBufferByteLength = temporaryArrayBuffer.Get("byteLength")
}
if temporaryUint8Array.Get("byteLength").Int() < temporaryArrayBuffer.Get("byteLength").Int() {
if temporaryUint8ArrayByteLength.Int() < bufl {
temporaryUint8Array = uint8Array.New(temporaryArrayBuffer)
temporaryUint8ArrayByteLength = temporaryUint8Array.Get("byteLength")
}
if temporaryFloat32Array.Get("byteLength").Int() < temporaryArrayBuffer.Get("byteLength").Int() {
if temporaryFloat32ArrayByteLength.Int() < bufl {
temporaryFloat32Array = float32Array.New(temporaryArrayBuffer)
temporaryFloat32ArrayByteLength = temporaryFloat32Array.Get("byteLength")
}
}