pcg.h (1404B)
1 /* 2 * PCG Random Number Generation for C. 3 * 4 * Copyright 2014 Melissa O'Neill <oneill@pcg-random.org> 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 * 18 * For additional information about the PCG random number generation scheme, 19 * including its license and other licensing options, visit 20 * 21 * http://www.pcg-random.org 22 */ 23 24 /* 25 * This code is derived from the full C implementation, which is in turn 26 * derived from the canonical C++ PCG implementation. The C++ version 27 * has many additional features and is preferable if you can use C++ in 28 * your project. 29 */ 30 31 #pragma once 32 33 #include "intrinsics.h" 34 #include "rng/rng_utils.h" 35 36 struct PCG { 37 u64 state; // RNG state. All values are possible. 38 u64 inc; // Controls which RNG sequence (stream) is 39 // selected. Must *always* be odd. 40 }; 41 42 PCG new_pcg(); 43 PCG new_pcg( u64 state, u64 seq ); 44 45 u32 rng_next( PCG * pcg );