forked from bartvdbraak/blender
e12c08e8d1
Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
79 lines
1.5 KiB
C
79 lines
1.5 KiB
C
/*
|
|
* Copyright 2011-2013 Blender Foundation
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef __UTIL_HASH_H__
|
|
#define __UTIL_HASH_H__
|
|
|
|
#include "util/util_types.h"
|
|
|
|
CCL_NAMESPACE_BEGIN
|
|
|
|
ccl_device_inline uint hash_int_2d(uint kx, uint ky)
|
|
{
|
|
#define rot(x, k) (((x) << (k)) | ((x) >> (32 - (k))))
|
|
|
|
uint a, b, c;
|
|
|
|
a = b = c = 0xdeadbeef + (2 << 2) + 13;
|
|
a += kx;
|
|
b += ky;
|
|
|
|
c ^= b;
|
|
c -= rot(b, 14);
|
|
a ^= c;
|
|
a -= rot(c, 11);
|
|
b ^= a;
|
|
b -= rot(a, 25);
|
|
c ^= b;
|
|
c -= rot(b, 16);
|
|
a ^= c;
|
|
a -= rot(c, 4);
|
|
b ^= a;
|
|
b -= rot(a, 14);
|
|
c ^= b;
|
|
c -= rot(b, 24);
|
|
|
|
return c;
|
|
|
|
#undef rot
|
|
}
|
|
|
|
ccl_device_inline uint hash_int(uint k)
|
|
{
|
|
return hash_int_2d(k, 0);
|
|
}
|
|
|
|
#ifndef __KERNEL_GPU__
|
|
static inline uint hash_string(const char *str)
|
|
{
|
|
uint i = 0, c;
|
|
|
|
while ((c = *str++))
|
|
i = i * 37 + c;
|
|
|
|
return i;
|
|
}
|
|
#endif
|
|
|
|
ccl_device_inline float hash_int_01(uint k)
|
|
{
|
|
return (float)hash_int(k) * (1.0f / (float)0xFFFFFFFF);
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|
|
|
|
#endif /* __UTIL_HASH_H__ */
|