From 8222bfe56d4dabe8d92fc4b25ea1b0163b16f3e1 Mon Sep 17 00:00:00 2001 From: 3gg <3gg@shellblade.net> Date: Sat, 4 May 2024 16:51:29 -0700 Subject: Initial commit. --- src/contrib/SDL-2.30.2/include/SDL_test_random.h | 115 +++++++++++++++++++++++ 1 file changed, 115 insertions(+) create mode 100644 src/contrib/SDL-2.30.2/include/SDL_test_random.h (limited to 'src/contrib/SDL-2.30.2/include/SDL_test_random.h') diff --git a/src/contrib/SDL-2.30.2/include/SDL_test_random.h b/src/contrib/SDL-2.30.2/include/SDL_test_random.h new file mode 100644 index 0000000..344646a --- /dev/null +++ b/src/contrib/SDL-2.30.2/include/SDL_test_random.h @@ -0,0 +1,115 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2024 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/** + * \file SDL_test_random.h + * + * Include file for SDL test framework. + * + * This code is a part of the SDL2_test library, not the main SDL library. + */ + +/* + + A "32-bit Multiply with carry random number generator. Very fast. + Includes a list of recommended multipliers. + + multiply-with-carry generator: x(n) = a*x(n-1) + carry mod 2^32. + period: (a*2^31)-1 + +*/ + +#ifndef SDL_test_random_h_ +#define SDL_test_random_h_ + +#include "begin_code.h" +/* Set up for C function definitions, even when using C++ */ +#ifdef __cplusplus +extern "C" { +#endif + +/* --- Definitions */ + +/* + * Macros that return a random number in a specific format. + */ +#define SDLTest_RandomInt(c) ((int)SDLTest_Random(c)) + +/* + * Context structure for the random number generator state. + */ + typedef struct { + unsigned int a; + unsigned int x; + unsigned int c; + unsigned int ah; + unsigned int al; + } SDLTest_RandomContext; + + +/* --- Function prototypes */ + +/** + * \brief Initialize random number generator with two integers. + * + * Note: The random sequence of numbers returned by ...Random() is the + * same for the same two integers and has a period of 2^31. + * + * \param rndContext pointer to context structure + * \param xi integer that defines the random sequence + * \param ci integer that defines the random sequence + * + */ + void SDLTest_RandomInit(SDLTest_RandomContext * rndContext, unsigned int xi, + unsigned int ci); + +/** + * \brief Initialize random number generator based on current system time. + * + * \param rndContext pointer to context structure + * + */ + void SDLTest_RandomInitTime(SDLTest_RandomContext *rndContext); + + +/** + * \brief Initialize random number generator based on current system time. + * + * Note: ...RandomInit() or ...RandomInitTime() must have been called + * before using this function. + * + * \param rndContext pointer to context structure + * + * \returns a random number (32bit unsigned integer) + * + */ + unsigned int SDLTest_Random(SDLTest_RandomContext *rndContext); + + +/* Ends C function definitions when using C++ */ +#ifdef __cplusplus +} +#endif +#include "close_code.h" + +#endif /* SDL_test_random_h_ */ + +/* vi: set ts=4 sw=4 expandtab: */ -- cgit v1.2.3