/* * Copyright (c) 2016, NVIDIA CORPORATION. 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. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * Neither the name of NVIDIA CORPORATION nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``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 OWNER 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. */ #pragma once #include <optixu/optixu_math_namespace.h> template<unsigned int N> static __host__ __device__ __inline__ unsigned int tea( unsigned int val0, unsigned int val1 ) { unsigned int v0 = val0; unsigned int v1 = val1; unsigned int s0 = 0; for( unsigned int n = 0; n < N; n++ ) { s0 += 0x9e3779b9; v0 += ((v1<<4)+0xa341316c)^(v1+s0)^((v1>>5)+0xc8013ea4); v1 += ((v0<<4)+0xad90777d)^(v0+s0)^((v0>>5)+0x7e95761e); } return v0; } // Generate random unsigned int in [0, 2^24) static __host__ __device__ __inline__ unsigned int lcg(unsigned int &prev) { const unsigned int LCG_A = 1664525u; const unsigned int LCG_C = 1013904223u; prev = (LCG_A * prev + LCG_C); return prev & 0x00FFFFFF; } static __host__ __device__ __inline__ unsigned int lcg2(unsigned int &prev) { prev = (prev*8121 + 28411) % 134456; return prev; } // Generate random float in [0, 1) static __host__ __device__ __inline__ float rnd(unsigned int &prev) { return ((float) lcg(prev) / (float) 0x01000000); } // Multiply with carry static __host__ __inline__ unsigned int mwc() { static unsigned long long r[4]; static unsigned long long carry; static bool init = false; if( !init ) { init = true; unsigned int seed = 7654321u, seed0, seed1, seed2, seed3; r[0] = seed0 = lcg2(seed); r[1] = seed1 = lcg2(seed0); r[2] = seed2 = lcg2(seed1); r[3] = seed3 = lcg2(seed2); carry = lcg2(seed3); } unsigned long long sum = 2111111111ull * r[3] + 1492ull * r[2] + 1776ull * r[1] + 5115ull * r[0] + 1ull * carry; r[3] = r[2]; r[2] = r[1]; r[1] = r[0]; r[0] = static_cast<unsigned int>(sum); // lower half carry = static_cast<unsigned int>(sum >> 32); // upper half return static_cast<unsigned int>(r[0]); } static __host__ __inline__ unsigned int random1u() { #if 0 return rand(); #else return mwc(); #endif } static __host__ __inline__ optix::uint2 random2u() { return optix::make_uint2(random1u(), random1u()); } static __host__ __inline__ void fillRandBuffer( unsigned int *seeds, unsigned int N ) { for( unsigned int i=0; i<N; ++i ) seeds[i] = mwc(); } static __host__ __device__ __inline__ unsigned int rot_seed( unsigned int seed, unsigned int frame ) { return seed ^ frame; }