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/*
* 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
/* ***** Jenkins Lookup3 Hash Functions ***** */
/* Source: http://burtleburtle.net/bob/c/lookup3.c */
#define rot(x, k) (((x) << (k)) | ((x) >> (32 - (k))))
#define mix(a, b, c) \
{ \
a -= c; \
a ^= rot(c, 4); \
c += b; \
b -= a; \
b ^= rot(a, 6); \
a += c; \
c -= b; \
c ^= rot(b, 8); \
b += a; \
a -= c; \
a ^= rot(c, 16); \
c += b; \
b -= a; \
b ^= rot(a, 19); \
a += c; \
c -= b; \
c ^= rot(b, 4); \
b += a; \
}
#define final(a, b, c) \
{ \
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); \
}
ccl_device_inline uint hash_uint(uint kx)
{
uint a, b, c;
a = b = c = 0xdeadbeef + (1 << 2) + 13;
a += kx;
final(a, b, c);
return c;
}
ccl_device_inline uint hash_uint2(uint kx, uint ky)
{
uint a, b, c;
a = b = c = 0xdeadbeef + (2 << 2) + 13;
b += ky;
a += kx;
final(a, b, c);
return c;
}
ccl_device_inline uint hash_uint3(uint kx, uint ky, uint kz)
{
uint a, b, c;
a = b = c = 0xdeadbeef + (3 << 2) + 13;
c += kz;
b += ky;
a += kx;
final(a, b, c);
return c;
}
ccl_device_inline uint hash_uint4(uint kx, uint ky, uint kz, uint kw)
{
uint a, b, c;
a = b = c = 0xdeadbeef + (4 << 2) + 13;
a += kx;
b += ky;
c += kz;
mix(a, b, c);
a += kw;
final(a, b, c);
return c;
}
#undef rot
#undef final
#undef mix
/* Hashing uint or uint[234] into a float in the range [0, 1]. */
ccl_device_inline float hash_uint_to_float(uint kx)
{
return (float)hash_uint(kx) / (float)0xFFFFFFFFu;
}
ccl_device_inline float hash_uint2_to_float(uint kx, uint ky)
{
return (float)hash_uint2(kx, ky) / (float)0xFFFFFFFFu;
}
ccl_device_inline float hash_uint3_to_float(uint kx, uint ky, uint kz)
{
return (float)hash_uint3(kx, ky, kz) / (float)0xFFFFFFFFu;
}
ccl_device_inline float hash_uint4_to_float(uint kx, uint ky, uint kz, uint kw)
{
return (float)hash_uint4(kx, ky, kz, kw) / (float)0xFFFFFFFFu;
}
/* Hashing float or float[234] into a float in the range [0, 1]. */
ccl_device_inline float hash_float_to_float(float k)
{
return hash_uint_to_float(__float_as_uint(k));
}
ccl_device_inline float hash_float2_to_float(float2 k)
{
return hash_uint2_to_float(__float_as_uint(k.x), __float_as_uint(k.y));
}
ccl_device_inline float hash_float3_to_float(float3 k)
{
return hash_uint3_to_float(__float_as_uint(k.x), __float_as_uint(k.y), __float_as_uint(k.z));
}
ccl_device_inline float hash_float4_to_float(float4 k)
{
return hash_uint4_to_float(
__float_as_uint(k.x), __float_as_uint(k.y), __float_as_uint(k.z), __float_as_uint(k.w));
}
/* Hashing float[234] into float[234] of components in the range [0, 1]. */
ccl_device_inline float2 hash_float2_to_float2(float2 k)
{
return make_float2(hash_float2_to_float(k), hash_float3_to_float(make_float3(k.x, k.y, 1.0)));
}
ccl_device_inline float3 hash_float3_to_float3(float3 k)
{
return make_float3(hash_float3_to_float(k),
hash_float4_to_float(make_float4(k.x, k.y, k.z, 1.0)),
hash_float4_to_float(make_float4(k.x, k.y, k.z, 2.0)));
}
ccl_device_inline float4 hash_float4_to_float4(float4 k)
{
return make_float4(hash_float4_to_float(k),
hash_float4_to_float(make_float4(k.w, k.x, k.y, k.z)),
hash_float4_to_float(make_float4(k.z, k.w, k.x, k.y)),
hash_float4_to_float(make_float4(k.y, k.z, k.w, k.x)));
}
/* Hashing float or float[234] into float3 of components in range [0, 1]. */
ccl_device_inline float3 hash_float_to_float3(float k)
{
return make_float3(hash_float_to_float(k),
hash_float2_to_float(make_float2(k, 1.0)),
hash_float2_to_float(make_float2(k, 2.0)));
}
ccl_device_inline float3 hash_float2_to_float3(float2 k)
{
return make_float3(hash_float2_to_float(k),
hash_float3_to_float(make_float3(k.x, k.y, 1.0)),
hash_float3_to_float(make_float3(k.x, k.y, 2.0)));
}
ccl_device_inline float3 hash_float4_to_float3(float4 k)
{
return make_float3(hash_float4_to_float(k),
hash_float4_to_float(make_float4(k.z, k.x, k.w, k.y)),
hash_float4_to_float(make_float4(k.w, k.z, k.y, k.x)));
}
#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_NAMESPACE_END
#endif /* __UTIL_HASH_H__ */
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