From 2d62bbb97e6767f21623210983b8240922f3d12f Mon Sep 17 00:00:00 2001 From: Syping Date: Fri, 15 Jun 2018 04:43:13 +0200 Subject: [PATCH] random generator now based on pcg-random --- ProfileInterface.cpp | 10 ++- SnapmaticPicture.cpp | 1 + gta5view.pro | 4 +- pcg/LICENSE.txt | 201 +++++++++++++++++++++++++++++++++++++++++++ pcg/pcg_basic.c | 116 +++++++++++++++++++++++++ pcg/pcg_basic.h | 78 +++++++++++++++++ 6 files changed, 405 insertions(+), 5 deletions(-) create mode 100644 pcg/LICENSE.txt create mode 100644 pcg/pcg_basic.c create mode 100644 pcg/pcg_basic.h diff --git a/ProfileInterface.cpp b/ProfileInterface.cpp index b26e33c..02411d6 100644 --- a/ProfileInterface.cpp +++ b/ProfileInterface.cpp @@ -29,6 +29,7 @@ #include "ProfileLoader.h" #include "ExportThread.h" #include "ImportDialog.h" +#include "pcg_basic.h" #include "AppEnv.h" #include "config.h" #include @@ -1945,8 +1946,9 @@ preSelectionTitle: int ProfileInterface::getRandomUid() { - std::mt19937 rng; - rng.seed(std::random_device()()); - std::uniform_int_distribution uiddist(10000000, 2147483647); - return uiddist(rng); + pcg32_random_t rng; + pcg32_srandom_r(&rng, time(NULL), (intptr_t)&rng); + int random_int = pcg32_boundedrand_r(&rng, 2147483647); + qDebug() << random_int; + return random_int; } diff --git a/SnapmaticPicture.cpp b/SnapmaticPicture.cpp index b0ef844..cda5287 100644 --- a/SnapmaticPicture.cpp +++ b/SnapmaticPicture.cpp @@ -189,6 +189,7 @@ bool SnapmaticPicture::preloadFile() rawPicContent = qUncompress(g5eContent); // Setting is values + isModernFormat = false; isLoadedInRAM = true; } else diff --git a/gta5view.pro b/gta5view.pro index c44734d..2a875da 100644 --- a/gta5view.pro +++ b/gta5view.pro @@ -64,6 +64,7 @@ SOURCES += main.cpp \ TranslationClass.cpp \ UserInterface.cpp \ anpro/JSHighlighter.cpp \ + pcg/pcg_basic.c \ tmext/TelemetryClassAuthenticator.cpp \ uimod/UiModLabel.cpp \ uimod/UiModWidget.cpp @@ -104,6 +105,7 @@ HEADERS += \ TranslationClass.h \ UserInterface.h \ anpro/JSHighlighter.h \ + pcg/pcg_basic.h \ tmext/TelemetryClassAuthenticator.h \ uimod/UiModLabel.h \ uimod/UiModWidget.h @@ -148,7 +150,7 @@ DISTFILES += res/app.rc \ res/gta5view.png \ lang/README.txt -INCLUDEPATH += ./anpro ./tmext ./uimod +INCLUDEPATH += ./anpro ./pcg ./tmext ./uimod # GTA5SYNC/GTA5VIEW ONLY diff --git a/pcg/LICENSE.txt b/pcg/LICENSE.txt new file mode 100644 index 0000000..8dada3e --- /dev/null +++ b/pcg/LICENSE.txt @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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The C++ version + * has many additional features and is preferable if you can use C++ in + * your project. + */ + +#include "pcg_basic.h" + +// state for global RNGs + +static pcg32_random_t pcg32_global = PCG32_INITIALIZER; + +// pcg32_srandom(initstate, initseq) +// pcg32_srandom_r(rng, initstate, initseq): +// Seed the rng. Specified in two parts, state initializer and a +// sequence selection constant (a.k.a. stream id) + +void pcg32_srandom_r(pcg32_random_t* rng, uint64_t initstate, uint64_t initseq) +{ + rng->state = 0U; + rng->inc = (initseq << 1u) | 1u; + pcg32_random_r(rng); + rng->state += initstate; + pcg32_random_r(rng); +} + +void pcg32_srandom(uint64_t seed, uint64_t seq) +{ + pcg32_srandom_r(&pcg32_global, seed, seq); +} + +// pcg32_random() +// pcg32_random_r(rng) +// Generate a uniformly distributed 32-bit random number + +uint32_t pcg32_random_r(pcg32_random_t* rng) +{ + uint64_t oldstate = rng->state; + rng->state = oldstate * 6364136223846793005ULL + rng->inc; + uint32_t xorshifted = ((oldstate >> 18u) ^ oldstate) >> 27u; + uint32_t rot = oldstate >> 59u; + return (xorshifted >> rot) | (xorshifted << ((-rot) & 31)); +} + +uint32_t pcg32_random() +{ + return pcg32_random_r(&pcg32_global); +} + + +// pcg32_boundedrand(bound): +// pcg32_boundedrand_r(rng, bound): +// Generate a uniformly distributed number, r, where 0 <= r < bound + +uint32_t pcg32_boundedrand_r(pcg32_random_t* rng, uint32_t bound) +{ + // To avoid bias, we need to make the range of the RNG a multiple of + // bound, which we do by dropping output less than a threshold. + // A naive scheme to calculate the threshold would be to do + // + // uint32_t threshold = 0x100000000ull % bound; + // + // but 64-bit div/mod is slower than 32-bit div/mod (especially on + // 32-bit platforms). In essence, we do + // + // uint32_t threshold = (0x100000000ull-bound) % bound; + // + // because this version will calculate the same modulus, but the LHS + // value is less than 2^32. + + uint32_t threshold = -bound % bound; + + // Uniformity guarantees that this loop will terminate. In practice, it + // should usually terminate quickly; on average (assuming all bounds are + // equally likely), 82.25% of the time, we can expect it to require just + // one iteration. In the worst case, someone passes a bound of 2^31 + 1 + // (i.e., 2147483649), which invalidates almost 50% of the range. In + // practice, bounds are typically small and only a tiny amount of the range + // is eliminated. + for (;;) { + uint32_t r = pcg32_random_r(rng); + if (r >= threshold) + return r % bound; + } +} + + +uint32_t pcg32_boundedrand(uint32_t bound) +{ + return pcg32_boundedrand_r(&pcg32_global, bound); +} + diff --git a/pcg/pcg_basic.h b/pcg/pcg_basic.h new file mode 100644 index 0000000..e2b526a --- /dev/null +++ b/pcg/pcg_basic.h @@ -0,0 +1,78 @@ +/* + * PCG Random Number Generation for C. + * + * Copyright 2014 Melissa O'Neill + * + * 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. + * + * For additional information about the PCG random number generation scheme, + * including its license and other licensing options, visit + * + * http://www.pcg-random.org + */ + +/* + * This code is derived from the full C implementation, which is in turn + * derived from the canonical C++ PCG implementation. The C++ version + * has many additional features and is preferable if you can use C++ in + * your project. + */ + +#ifndef PCG_BASIC_H_INCLUDED +#define PCG_BASIC_H_INCLUDED 1 + +#include + +#if __cplusplus +extern "C" { +#endif + +struct pcg_state_setseq_64 { // Internals are *Private*. + uint64_t state; // RNG state. All values are possible. + uint64_t inc; // Controls which RNG sequence (stream) is + // selected. Must *always* be odd. +}; +typedef struct pcg_state_setseq_64 pcg32_random_t; + +// If you *must* statically initialize it, here's one. + +#define PCG32_INITIALIZER { 0x853c49e6748fea9bULL, 0xda3e39cb94b95bdbULL } + +// pcg32_srandom(initstate, initseq) +// pcg32_srandom_r(rng, initstate, initseq): +// Seed the rng. Specified in two parts, state initializer and a +// sequence selection constant (a.k.a. stream id) + +void pcg32_srandom(uint64_t initstate, uint64_t initseq); +void pcg32_srandom_r(pcg32_random_t* rng, uint64_t initstate, + uint64_t initseq); + +// pcg32_random() +// pcg32_random_r(rng) +// Generate a uniformly distributed 32-bit random number + +uint32_t pcg32_random(void); +uint32_t pcg32_random_r(pcg32_random_t* rng); + +// pcg32_boundedrand(bound): +// pcg32_boundedrand_r(rng, bound): +// Generate a uniformly distributed number, r, where 0 <= r < bound + +uint32_t pcg32_boundedrand(uint32_t bound); +uint32_t pcg32_boundedrand_r(pcg32_random_t* rng, uint32_t bound); + +#if __cplusplus +} +#endif + +#endif // PCG_BASIC_H_INCLUDED