mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-15 07:27:32 +01:00
104 lines
4.2 KiB
Go
104 lines
4.2 KiB
Go
// 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 gl
|
|
|
|
import (
|
|
"syscall/js"
|
|
)
|
|
|
|
var (
|
|
object = js.Global().Get("Object")
|
|
arrayBuffer = js.Global().Get("ArrayBuffer")
|
|
uint8Array = js.Global().Get("Uint8Array")
|
|
float32Array = js.Global().Get("Float32Array")
|
|
int32Array = js.Global().Get("Int32Array")
|
|
)
|
|
|
|
var (
|
|
tmpArrayBufferByteLength = 16
|
|
|
|
// tmpArrayBuffer 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.
|
|
tmpArrayBuffer = arrayBuffer.New(tmpArrayBufferByteLength)
|
|
|
|
// tmpUint8Array is a Uint8ArrayBuffer whose underlying buffer is always temporaryArrayBuffer.
|
|
tmpUint8Array = uint8Array.New(tmpArrayBuffer)
|
|
|
|
// tmpFloat32Array is a Float32ArrayBuffer whose underlying buffer is always temporaryArrayBuffer.
|
|
tmpFloat32Array = float32Array.New(tmpArrayBuffer)
|
|
|
|
// tmpInt32Array is a Float32ArrayBuffer whose underlying buffer is always temporaryArrayBuffer.
|
|
tmpInt32Array = int32Array.New(tmpArrayBuffer)
|
|
)
|
|
|
|
func ensureTemporaryArrayBufferSize(byteLength int) {
|
|
if bufl := tmpArrayBufferByteLength; bufl < byteLength {
|
|
for bufl < byteLength {
|
|
bufl *= 2
|
|
}
|
|
tmpArrayBufferByteLength = bufl
|
|
tmpArrayBuffer = arrayBuffer.New(bufl)
|
|
tmpUint8Array = uint8Array.New(tmpArrayBuffer)
|
|
tmpFloat32Array = float32Array.New(tmpArrayBuffer)
|
|
tmpInt32Array = int32Array.New(tmpArrayBuffer)
|
|
}
|
|
}
|
|
|
|
// tmpUint8ArrayFromUint8Slice returns a Uint8Array whose length is at least minLength from an uint8 slice.
|
|
// Be careful that the length can exceed the given minLength.
|
|
// data must be a slice of a numeric type for initialization, or nil if you don't need initialization.
|
|
func tmpUint8ArrayFromUint8Slice(minLength int, data []uint8) js.Value {
|
|
ensureTemporaryArrayBufferSize(minLength)
|
|
copyUint8SliceToTemporaryArrayBuffer(data)
|
|
return tmpUint8Array
|
|
}
|
|
|
|
// tmpUint8ArrayFromUint16Slice returns a Uint8Array whose length is at least minLength from an uint16 slice.
|
|
// Be careful that the length can exceed the given minLength.
|
|
// data must be a slice of a numeric type for initialization, or nil if you don't need initialization.
|
|
func tmpUint8ArrayFromUint16Slice(minLength int, data []uint16) js.Value {
|
|
ensureTemporaryArrayBufferSize(minLength * 2)
|
|
copySliceToTemporaryArrayBuffer(data)
|
|
return tmpUint8Array
|
|
}
|
|
|
|
// tmpUint8ArrayFromFloat32Slice returns a Uint8Array whose length is at least minLength from a float32 slice.
|
|
// Be careful that the length can exceed the given minLength.
|
|
// data must be a slice of a numeric type for initialization, or nil if you don't need initialization.
|
|
func tmpUint8ArrayFromFloat32Slice(minLength int, data []float32) js.Value {
|
|
ensureTemporaryArrayBufferSize(minLength * 4)
|
|
copySliceToTemporaryArrayBuffer(data)
|
|
return tmpUint8Array
|
|
}
|
|
|
|
// tmpFloat32ArrayFromFloat32Slice returns a Float32Array whose length is at least minLength.
|
|
// Be careful that the length can exceed the given minLength.
|
|
// data must be a slice of a numeric type for initialization, or nil if you don't need initialization.
|
|
func tmpFloat32ArrayFromFloat32Slice(minLength int, data []float32) js.Value {
|
|
ensureTemporaryArrayBufferSize(minLength * 4)
|
|
copySliceToTemporaryArrayBuffer(data)
|
|
return tmpFloat32Array
|
|
}
|
|
|
|
// tmpInt32ArrayFromInt32Slice returns a Int32Array whose length is at least minLength.
|
|
// Be careful that the length can exceed the given minLength.
|
|
// data must be a slice of a numeric type for initialization, or nil if you don't need initialization.
|
|
func tmpInt32ArrayFromInt32Slice(minLength int, data []int32) js.Value {
|
|
ensureTemporaryArrayBufferSize(minLength * 4)
|
|
copySliceToTemporaryArrayBuffer(data)
|
|
return tmpInt32Array
|
|
}
|