23564583a4
This patch extends perlin noise to operate in 1D, 2D, 3D, and 4D space. The noise code has also been refactored to be more readable. The Color output and distortion patterns changed, so this patch breaks backward compatibility. This is due to the fact that we now use random offsets as noise seeds, as opposed to swizzling and constants offsets. Reviewers: brecht, JacquesLucke Differential Revision: https://developer.blender.org/D5560
334 lines
6.8 KiB
C
334 lines
6.8 KiB
C
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __UTIL_HASH_H__
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#define __UTIL_HASH_H__
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#include "util/util_types.h"
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CCL_NAMESPACE_BEGIN
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/* ***** Jenkins Lookup3 Hash Functions ***** */
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/* Source: http://burtleburtle.net/bob/c/lookup3.c */
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#define rot(x, k) (((x) << (k)) | ((x) >> (32 - (k))))
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#define mix(a, b, c) \
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{ \
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a -= c; \
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a ^= rot(c, 4); \
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c += b; \
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b -= a; \
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b ^= rot(a, 6); \
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a += c; \
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c -= b; \
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c ^= rot(b, 8); \
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b += a; \
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a -= c; \
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a ^= rot(c, 16); \
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c += b; \
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b -= a; \
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b ^= rot(a, 19); \
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a += c; \
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c -= b; \
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c ^= rot(b, 4); \
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b += a; \
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}
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#define final(a, b, c) \
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{ \
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c ^= b; \
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c -= rot(b, 14); \
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a ^= c; \
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a -= rot(c, 11); \
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b ^= a; \
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b -= rot(a, 25); \
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c ^= b; \
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c -= rot(b, 16); \
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a ^= c; \
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a -= rot(c, 4); \
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b ^= a; \
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b -= rot(a, 14); \
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c ^= b; \
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c -= rot(b, 24); \
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}
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ccl_device_inline uint hash_uint(uint kx)
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{
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uint a, b, c;
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a = b = c = 0xdeadbeef + (1 << 2) + 13;
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a += kx;
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final(a, b, c);
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return c;
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}
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ccl_device_inline uint hash_uint2(uint kx, uint ky)
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{
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uint a, b, c;
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a = b = c = 0xdeadbeef + (2 << 2) + 13;
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b += ky;
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a += kx;
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final(a, b, c);
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return c;
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}
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ccl_device_inline uint hash_uint3(uint kx, uint ky, uint kz)
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{
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uint a, b, c;
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a = b = c = 0xdeadbeef + (3 << 2) + 13;
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c += kz;
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b += ky;
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a += kx;
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final(a, b, c);
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return c;
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}
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ccl_device_inline uint hash_uint4(uint kx, uint ky, uint kz, uint kw)
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{
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uint a, b, c;
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a = b = c = 0xdeadbeef + (4 << 2) + 13;
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a += kx;
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b += ky;
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c += kz;
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mix(a, b, c);
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a += kw;
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final(a, b, c);
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return c;
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}
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#undef rot
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#undef final
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#undef mix
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/* Hashing uint or uint[234] into a float in the range [0, 1]. */
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ccl_device_inline float hash_uint_to_float(uint kx)
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{
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return (float)hash_uint(kx) / (float)0xFFFFFFFFu;
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}
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ccl_device_inline float hash_uint2_to_float(uint kx, uint ky)
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{
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return (float)hash_uint2(kx, ky) / (float)0xFFFFFFFFu;
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}
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ccl_device_inline float hash_uint3_to_float(uint kx, uint ky, uint kz)
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{
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return (float)hash_uint3(kx, ky, kz) / (float)0xFFFFFFFFu;
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}
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ccl_device_inline float hash_uint4_to_float(uint kx, uint ky, uint kz, uint kw)
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{
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return (float)hash_uint4(kx, ky, kz, kw) / (float)0xFFFFFFFFu;
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}
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/* Hashing float or float[234] into a float in the range [0, 1]. */
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ccl_device_inline float hash_float_to_float(float k)
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{
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return hash_uint_to_float(__float_as_uint(k));
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}
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ccl_device_inline float hash_float2_to_float(float2 k)
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{
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return hash_uint2_to_float(__float_as_uint(k.x), __float_as_uint(k.y));
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}
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ccl_device_inline float hash_float3_to_float(float3 k)
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{
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return hash_uint3_to_float(__float_as_uint(k.x), __float_as_uint(k.y), __float_as_uint(k.z));
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}
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ccl_device_inline float hash_float4_to_float(float4 k)
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{
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return hash_uint4_to_float(
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__float_as_uint(k.x), __float_as_uint(k.y), __float_as_uint(k.z), __float_as_uint(k.w));
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}
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/* Hashing float[234] into float[234] of components in the range [0, 1]. */
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ccl_device_inline float2 hash_float2_to_float2(float2 k)
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{
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return make_float2(hash_float2_to_float(k), hash_float3_to_float(make_float3(k.x, k.y, 1.0)));
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}
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ccl_device_inline float3 hash_float3_to_float3(float3 k)
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{
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return make_float3(hash_float3_to_float(k),
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hash_float4_to_float(make_float4(k.x, k.y, k.z, 1.0)),
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hash_float4_to_float(make_float4(k.x, k.y, k.z, 2.0)));
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}
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ccl_device_inline float4 hash_float4_to_float4(float4 k)
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{
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return make_float4(hash_float4_to_float(k),
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hash_float4_to_float(make_float4(k.w, k.x, k.y, k.z)),
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hash_float4_to_float(make_float4(k.z, k.w, k.x, k.y)),
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hash_float4_to_float(make_float4(k.y, k.z, k.w, k.x)));
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}
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/* Hashing float or float[234] into float3 of components in range [0, 1]. */
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ccl_device_inline float3 hash_float_to_float3(float k)
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{
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return make_float3(hash_float_to_float(k),
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hash_float2_to_float(make_float2(k, 1.0)),
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hash_float2_to_float(make_float2(k, 2.0)));
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}
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ccl_device_inline float3 hash_float2_to_float3(float2 k)
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{
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return make_float3(hash_float2_to_float(k),
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hash_float3_to_float(make_float3(k.x, k.y, 1.0)),
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hash_float3_to_float(make_float3(k.x, k.y, 2.0)));
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}
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ccl_device_inline float3 hash_float4_to_float3(float4 k)
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{
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return make_float3(hash_float4_to_float(k),
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hash_float4_to_float(make_float4(k.z, k.x, k.w, k.y)),
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hash_float4_to_float(make_float4(k.w, k.z, k.y, k.x)));
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}
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/* SSE Versions Of Jenkins Lookup3 Hash Functions */
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#ifdef __KERNEL_SSE2__
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# define rot(x, k) (((x) << (k)) | (srl(x, 32 - (k))))
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# define mix(a, b, c) \
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{ \
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a -= c; \
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a ^= rot(c, 4); \
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c += b; \
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b -= a; \
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b ^= rot(a, 6); \
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a += c; \
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c -= b; \
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c ^= rot(b, 8); \
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b += a; \
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a -= c; \
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a ^= rot(c, 16); \
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c += b; \
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b -= a; \
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b ^= rot(a, 19); \
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a += c; \
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c -= b; \
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c ^= rot(b, 4); \
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b += a; \
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}
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# define final(a, b, c) \
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{ \
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c ^= b; \
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c -= rot(b, 14); \
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a ^= c; \
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a -= rot(c, 11); \
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b ^= a; \
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b -= rot(a, 25); \
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c ^= b; \
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c -= rot(b, 16); \
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a ^= c; \
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a -= rot(c, 4); \
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b ^= a; \
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b -= rot(a, 14); \
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c ^= b; \
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c -= rot(b, 24); \
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}
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ccl_device_inline ssei hash_ssei(ssei kx)
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{
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ssei a, b, c;
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a = b = c = ssei(0xdeadbeef + (1 << 2) + 13);
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a += kx;
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final(a, b, c);
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return c;
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}
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ccl_device_inline ssei hash_ssei2(ssei kx, ssei ky)
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{
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ssei a, b, c;
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a = b = c = ssei(0xdeadbeef + (2 << 2) + 13);
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b += ky;
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a += kx;
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final(a, b, c);
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return c;
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}
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ccl_device_inline ssei hash_ssei3(ssei kx, ssei ky, ssei kz)
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{
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ssei a, b, c;
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a = b = c = ssei(0xdeadbeef + (3 << 2) + 13);
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c += kz;
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b += ky;
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a += kx;
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final(a, b, c);
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return c;
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}
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ccl_device_inline ssei hash_ssei4(ssei kx, ssei ky, ssei kz, ssei kw)
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{
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ssei a, b, c;
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a = b = c = ssei(0xdeadbeef + (4 << 2) + 13);
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a += kx;
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b += ky;
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c += kz;
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mix(a, b, c);
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a += kw;
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final(a, b, c);
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return c;
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}
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# undef rot
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# undef final
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# undef mix
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#endif
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#ifndef __KERNEL_GPU__
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static inline uint hash_string(const char *str)
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{
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uint i = 0, c;
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while ((c = *str++))
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i = i * 37 + c;
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return i;
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}
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#endif
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CCL_NAMESPACE_END
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#endif /* __UTIL_HASH_H__ */
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