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jsutil: Avoid creating Uint8Array when copying bytes from Go to JS

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Updates #1435
This commit is contained in:
Hajime Hoshi 2020-12-16 01:30:09 +09:00
parent 49b86843c3
commit 7e32075abd
4 changed files with 24 additions and 120 deletions
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19
internal/graphicsdriver/opengl/context_js.go
View File

@ -202,7 +202,7 @@ func (c *context) framebufferPixels(f *framebuffer, width, height int) []byte {
c.bindFramebuffer(f.native)
l := 4 * width * height
p := jsutil.TemporaryUint8Array(l)
p := jsutil.TemporaryUint8Array(l, nil)
gl.Call("readPixels", 0, 0, width, height, gles.RGBA, gles.UNSIGNED_BYTE, p)
return jsutil.Uint8ArrayToSlice(p, l)
@ -387,8 +387,7 @@ func (c *context) uniformFloats(p program, location string, v []float32, typ sha
base = typ.Sub[0].Main
}
arr := jsutil.TemporaryFloat32Array(len(v))
jsutil.CopySliceToJS(arr, v)
arr := jsutil.TemporaryFloat32Array(len(v), v)
switch base {
case shaderir.Float:
@ -484,8 +483,7 @@ func (c *context) bindElementArrayBuffer(b buffer) {
func (c *context) arrayBufferSubData(data []float32) {
gl := c.gl
l := len(data) * 4
arr := jsutil.TemporaryUint8Array(l)
jsutil.CopySliceToJS(arr, data)
arr := jsutil.TemporaryUint8Array(l, data)
if isWebGL2Available {
gl.Call("bufferSubData", gles.ARRAY_BUFFER, 0, arr, 0, l)
} else {
@ -496,8 +494,7 @@ func (c *context) arrayBufferSubData(data []float32) {
func (c *context) elementArrayBufferSubData(data []uint16) {
gl := c.gl
l := len(data) * 2
arr := jsutil.TemporaryUint8Array(l)
jsutil.CopySliceToJS(arr, data)
arr := jsutil.TemporaryUint8Array(l, data)
if isWebGL2Available {
gl.Call("bufferSubData", gles.ELEMENT_ARRAY_BUFFER, 0, arr, 0, l)
} else {
@ -542,8 +539,7 @@ func (c *context) texSubImage2D(t textureNative, width, height int, args []*driv
c.bindTexture(t)
gl := c.gl
for _, a := range args {
arr := jsutil.TemporaryUint8Array(len(a.Pixels))
jsutil.CopySliceToJS(arr, a.Pixels)
arr := jsutil.TemporaryUint8Array(len(a.Pixels), a.Pixels)
if isWebGL2Available {
// void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
// GLsizei width, GLsizei height,
@ -578,8 +574,7 @@ func (c *context) replacePixelsWithPBO(buffer buffer, t textureNative, width, he
stride := 4 * width
for _, a := range args {
arr := jsutil.TemporaryUint8Array(len(a.Pixels))
jsutil.CopySliceToJS(arr, a.Pixels)
arr := jsutil.TemporaryUint8Array(len(a.Pixels), a.Pixels)
offset := 4 * (a.Y*width + a.X)
for j := 0; j < a.Height; j++ {
gl.Call("bufferSubData", gles.PIXEL_UNPACK_BUFFER, offset+stride*j, arr, 4*a.Width*j, 4*a.Width)
@ -597,7 +592,7 @@ func (c *context) getBufferSubData(buffer buffer, width, height int) []byte {
gl := c.gl
gl.Call("bindBuffer", gles.PIXEL_UNPACK_BUFFER, buffer)
l := 4 * width * height
arr := jsutil.TemporaryUint8Array(l)
arr := jsutil.TemporaryUint8Array(l, nil)
if isWebGL2Available {
gl.Call("getBufferSubData", gles.PIXEL_UNPACK_BUFFER, 0, arr, 0, l)
} else {

41
internal/jsutil/buf_js.go
View File

@ -18,11 +18,6 @@ import (
"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()
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.
@ -43,40 +38,32 @@ func ensureTemporaryArrayBufferSize(byteLength int) {
}
temporaryArrayBuffer = js.Global().Get("ArrayBuffer").New(bufl)
}
if temporaryUint8Array.Get("byteLength").Int() < temporaryArrayBuffer.Get("byteLength").Int() {
temporaryUint8Array = js.Global().Get("Uint8Array").New(temporaryArrayBuffer)
}
if temporaryFloat32Array.Get("byteLength").Int() < temporaryArrayBuffer.Get("byteLength").Int() {
temporaryFloat32Array = js.Global().Get("Float32Array").New(temporaryArrayBuffer)
}
}
// TemporaryUint8Array returns a Uint8Array whose length is at least minLength.
// Be careful that the length can exceed the given minLength.
func TemporaryUint8Array(minLength int) js.Value {
// data must be a slice of a numeric type for initialization, or nil if you don't need initialization.
func TemporaryUint8Array(minLength int, data interface{}) js.Value {
ensureTemporaryArrayBufferSize(minLength)
if temporaryUint8Array.Get("byteLength").Int() < temporaryArrayBuffer.Get("byteLength").Int() {
temporaryUint8Array = js.Global().Get("Uint8Array").New(temporaryArrayBuffer)
if data != nil {
copySliceToTemporaryArrayBuffer(data)
}
return temporaryUint8Array
}
// TemporaryFloat32Array returns a Float32Array whose length is at least minLength.
// Be careful that the length can exceed the given minLength.
func TemporaryFloat32Array(minLength int) js.Value {
// data must be a slice of a numeric type for initialization, or nil if you don't need initialization.
func TemporaryFloat32Array(minLength int, data interface{}) js.Value {
ensureTemporaryArrayBufferSize(minLength * 4)
if temporaryFloat32Array.Get("byteLength").Int() < temporaryArrayBuffer.Get("byteLength").Int() {
temporaryFloat32Array = js.Global().Get("Float32Array").New(temporaryArrayBuffer)
if data != nil {
copySliceToTemporaryArrayBuffer(data)
}
return temporaryFloat32Array
}
var uint8ArrayObj js.Value
// TODO: Remove this
func uint8Array(buffer js.Value, byteOffset, byteLength int) js.Value {
if isTypedArrayWritable {
if Equal(uint8ArrayObj, js.Undefined()) {
uint8ArrayObj = js.Global().Get("Uint8Array").New()
}
uint8ArrayObj.Set("buffer", buffer)
uint8ArrayObj.Set("byteOffset", byteOffset)
uint8ArrayObj.Set("byteLength", byteLength)
return uint8ArrayObj
}
return js.Global().Get("Uint8Array").New(buffer, byteOffset, byteLength)
}

77
internal/jsutil/jsutil_js_test.go
View File

@ -1,77 +0,0 @@
// 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_test
import (
"syscall/js"
"testing"
. "github.com/hajimehoshi/ebiten/v2/internal/jsutil"
)
func TestCopySliceToJS(t *testing.T) {
tests := []struct {
in interface{}
out js.Value
}{
{
in: []int8{1, 2, 3},
out: js.Global().Get("Int8Array").Call("of", 1, 2, 3),
},
{
in: []int16{1, 2, 3},
out: js.Global().Get("Int16Array").Call("of", 1, 2, 3),
},
{
in: []int32{1, 2, 3},
out: js.Global().Get("Int32Array").Call("of", 1, 2, 3),
},
{
in: []uint8{1, 2, 3},
out: js.Global().Get("Uint8Array").Call("of", 1, 2, 3),
},
{
in: []uint16{1, 2, 3},
out: js.Global().Get("Uint16Array").Call("of", 1, 2, 3),
},
{
in: []uint32{1, 2, 3},
out: js.Global().Get("Uint32Array").Call("of", 1, 2, 3),
},
{
in: []float32{1, 2, 3},
out: js.Global().Get("Float32Array").Call("of", 1, 2, 3),
},
{
in: []float64{1, 2, 3},
out: js.Global().Get("Float64Array").Call("of", 1, 2, 3),
},
}
for _, test := range tests {
got := test.out.Get("constructor").New(test.out.Get("length"))
CopySliceToJS(got, test.in)
want := test.out
if got.Length() != want.Length() {
t.Errorf("length: got: %d, want: %d", got.Length(), want.Length())
}
for i := 0; i < got.Length(); i++ {
gotv := got.Index(i).Float()
wantv := want.Index(i).Float()
if gotv != wantv {
t.Errorf("[%d]: got: %v, want: %v", i, gotv, wantv)
}
}
}
}

7
internal/jsutil/slice_js.go
View File

@ -93,13 +93,12 @@ func sliceToByteSlice(s interface{}) (bs []byte) {
return
}
func CopySliceToJS(dst js.Value, src interface{}) {
func copySliceToTemporaryArrayBuffer(src interface{}) {
switch s := src.(type) {
case []uint8:
js.CopyBytesToJS(dst, s)
js.CopyBytesToJS(temporaryUint8Array, s)
case []int8, []int16, []int32, []uint16, []uint32, []float32, []float64:
a := uint8Array(dst.Get("buffer"), dst.Get("byteOffset").Int(), dst.Get("byteLength").Int())
js.CopyBytesToJS(a, sliceToByteSlice(s))
js.CopyBytesToJS(temporaryUint8Array, sliceToByteSlice(s))
default:
panic(fmt.Sprintf("jsutil: unexpected value at CopySliceToJS: %T", s))
}