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/*
* Copyright (c) 2021-2024 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
private import CxxStdlib
internal import WebGPU_Internal.Buffer
extension WebGPU.Buffer {
func copy(from source: Span<UInt8>, offset: Int) {
// FIXME (rdar://161274084): Swift doesn't have a lifetime-safe way to return a borrowed value from a refcounted object yet.
let bufferContents = unsafe MutableSpan(_unsafeCxxSpan: getBufferContents())
var destination = bufferContents._consumingExtracting(droppingFirst: offset)
destination.copyMemory(from: source)
}
}
// FIXME(emw): Find a way to generate thunks like these, maybe via a macro?
// FIXME: Eventually all these "thunks" should be removed.
// swift-format-ignore: AlwaysUseLowerCamelCase
@_expose(Cxx)
public func Buffer_copyFrom_thunk(_ buffer: WebGPU.Buffer, from data: WebGPU.SpanConstUInt8, offset: Int) {
buffer.copy(from: unsafe Span<UInt8>(_unsafeCxxSpan: data), offset: offset)
}
// FIXME: Eventually all these "thunks" should be removed.
// swift-format-ignore: AlwaysUseLowerCamelCase
@_expose(Cxx)
public func Buffer_getMappedRange_thunk(_ buffer: WebGPU.Buffer, offset: Int, size: Int) -> WebGPU.SpanUInt8 {
unsafe buffer.getMappedRange(offset: offset, size: size)
}
extension WebGPU.Buffer {
func getMappedRange(offset: Int, size: Int) -> WebGPU.SpanUInt8 {
if !isValid() {
return unsafe WebGPU.SpanUInt8()
}
var rangeSize = size
if size == WGPU_WHOLE_MAP_SIZE {
rangeSize = max(Int(currentSize()) - offset, 0)
}
if !validateGetMappedRange(offset, rangeSize) {
return unsafe WebGPU.SpanUInt8()
}
m_mappedRanges.add(.init(UInt(offset), UInt(offset + rangeSize)))
m_mappedRanges.compact()
if m_buffer.storageMode == .private || m_buffer.storageMode == .memoryless || m_buffer.length == 0 {
return unsafe WebGPU.SpanUInt8()
}
return unsafe getBufferContents().subspan(offset, rangeSize)
}
}
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