//
// Copyright (C) 2021 Erwin Müller <erwin@muellerpublic.de>
// Released as open-source under the Apache License, Version 2.0.
//
// ****************************************************************************
// ANL-OpenCL :: OpenCL
// ****************************************************************************
//
// Copyright (C) 2021 Erwin Müller <erwin@muellerpublic.de>
//
// 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
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
// limitations under the License.
//
// ****************************************************************************
// ANL-OpenCL :: OpenCL is a derivative work based on Josua Tippetts' C++ library:
// http://accidentalnoise.sourceforge.net/index.html
// ****************************************************************************
//
// Copyright (C) 2011 Joshua Tippetts
//
//   This software is provided 'as-is', without any express or implied
//   warranty.  In no event will the authors be held liable for any damages
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//   1. The origin of this software must not be misrepresented; you must not
//      claim that you wrote the original software. If you use this software
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//      appreciated but is not required.
//   2. Altered source versions must be plainly marked as such, and must not be
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//   3. This notice may not be removed or altered from any source distribution.
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//
// ****************************************************************************
// ANL-OpenCL :: OpenCL bundles and uses the RandomCL library:
// https://github.com/bstatcomp/RandomCL
// ****************************************************************************
//
// BSD 3-Clause License
//
// Copyright (c) 2018, Tadej Ciglarič, Erik Štrumbelj, Rok Češnovar. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER 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.
//

/*
 * hashing.h
 *
 *  Created on: Jul 27, 2021
 *      Author: Erwin Müller
 */

#ifndef HASHING_H_
#define HASHING_H_

#ifdef __cplusplus
extern "C" {
#endif

#ifndef ANLOPENCL_USE_OPENCL
#include <opencl_utils.h>
#endif // ANLOPENCL_USE_OPENCL

#define FNV_32_PRIME ((uint)0x01000193)
#define FNV_32_INIT ((uint )2166136261)
#define FNV_MASK_8 (((uint)1<<8)-1)

uint hash_coords_2(uint x, uint y, uint seed);
uint hash_coords_3(uint x, uint y, uint z, uint seed);
uint hash_coords_4(uint x, uint y, uint z, uint w, uint seed);
uint hash_coords_6(uint x, uint y, uint z, uint w, uint u, uint v, uint seed);

uint fnv_32_a_combine(uint hash, uint val);
unsigned char xor_fold_hash(uint hash);

#ifdef __cplusplus
}
#endif

#endif /* HASHING_H_ */
