Implicit surface rendering via ray tracing
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/*
* Copyright (c) 2020-2021, NVIDIA CORPORATION. All rights reserved.
*
* 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.
*
* SPDX-FileCopyrightText: Copyright (c) 2020-2021 NVIDIA CORPORATION
* SPDX-License-Identifier: Apache-2.0
*/
/// \nodoc (keyword to exclude this file from automatic README.md generation)
#pragma once
#include <cstddef>
#include <utility>
namespace nvh {
class FileMapping
{
public:
FileMapping(FileMapping&& other) noexcept { this->operator=(std::move(other)); };
FileMapping& operator=(FileMapping&& other) noexcept
{
m_isValid = other.m_isValid;
m_fileSize = other.m_fileSize;
m_mappingType = other.m_mappingType;
m_mappingPtr = other.m_mappingPtr;
m_mappingSize = other.m_mappingSize;
#ifdef _WIN32
m_win32.file = other.m_win32.file;
m_win32.fileMapping = other.m_win32.fileMapping;
other.m_win32.file = nullptr;
other.m_win32.fileMapping = nullptr;
#else
m_unix.file = other.m_unix.file;
other.m_unix.file = -1;
#endif
other.m_isValid = false;
other.m_mappingPtr = nullptr;
return *this;
}
FileMapping(const FileMapping&) = delete;
FileMapping& operator=(const FileMapping& other) = delete;
FileMapping() {}
~FileMapping() { close(); }
enum MappingType
{
MAPPING_READONLY, // opens existing file for read-only access
MAPPING_READOVERWRITE, // creates new file with read/write access, overwriting existing files
};
// fileSize only for write access
bool open(const char* filename, MappingType mappingType, size_t fileSize = 0);
void close();
const void* data() const { return m_mappingPtr; }
void* data() { return m_mappingPtr; }
size_t size() const { return m_mappingSize; }
bool valid() const { return m_isValid; }
protected:
static size_t g_pageSize;
#ifdef _WIN32
struct
{
void* file = nullptr;
void* fileMapping = nullptr;
} m_win32;
#else
struct
{
int file = -1;
} m_unix;
#endif
bool m_isValid = false;
size_t m_fileSize = 0;
MappingType m_mappingType = MappingType::MAPPING_READONLY;
void* m_mappingPtr = nullptr;
size_t m_mappingSize = 0;
};
// convenience types
class FileReadMapping : private FileMapping
{
public:
bool open(const char* filename) { return FileMapping::open(filename, MAPPING_READONLY, 0); }
void close() { FileMapping::close(); }
const void* data() const { return m_mappingPtr; }
size_t size() const { return m_fileSize; }
bool valid() const { return m_isValid; }
};
class FileReadOverWriteMapping : private FileMapping
{
public:
bool open(const char* filename, size_t fileSize)
{
return FileMapping::open(filename, MAPPING_READOVERWRITE, fileSize);
}
void close() { FileMapping::close(); }
void* data() { return m_mappingPtr; }
size_t size() const { return m_fileSize; }
bool valid() const { return m_isValid; }
};
} // namespace nvh