MappedRangeGuard.cpp

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "MappedRangeGuard.h"

namespace mozilla::webgpu {

/* static */

Maybe<MappedRangeGuard> MappedRangeGuard::Create(const ffi::WGPUGlobal* aGlobal,

                                                 ffi::WGPUBufferId aBufferId,

                                                 uint64_t aStart,

                                                 uint64_t aSize) {

  const auto mappingResult = ffi::wgpu_server_buffer_get_mapped_range(

      aGlobal, aBufferId, aStart, aSize);

  if (!mappingResult.core_mapping) return Nothing();

  // Getting the range *did* succeed, right?

  MOZ_RELEASE_ASSERT(mappingResult.ptr != nullptr);

  MOZ_RELEASE_ASSERT(mappingResult.length >= aSize);

  return Some(MappedRangeGuard(mappingResult));

MappedRangeGuard::MappedRangeGuard(

    ffi::WGPUBufferMappingResult aSuccessfulMapping)

    : mSpan(std::span(aSuccessfulMapping.ptr, aSuccessfulMapping.length)),

      mWgpuMapping(aSuccessfulMapping.core_mapping) {}

void MappedRangeGuard::WGPUBufferMappingDeleter::operator()(

    ffi::WGPUBufferMapping* mapping) const noexcept {

  ffi::wgpu_server_buffer_mapping_destroy(mapping);

}  // namespace mozilla::webgpu