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https://github.com/Relintai/sdl2_frt.git
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24c86b5501
since the window system doesn't do it for us like other platforms. This prevents sticky keys and missed keys when going in and out of focus, for example Alt would appear to stick if switching away from an SDL app with Alt-Tab and had to be pressed again. CR: Sam
116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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* \file SDL_test_random.h
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*
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* Include file for SDL test framework.
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*
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* This code is a part of the SDL2_test library, not the main SDL library.
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*/
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/*
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A "32-bit Multiply with carry random number generator. Very fast.
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Includes a list of recommended multipliers.
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multiply-with-carry generator: x(n) = a*x(n-1) + carry mod 2^32.
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period: (a*2^31)-1
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*/
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#ifndef _SDL_test_random_h
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#define _SDL_test_random_h
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* --- Definitions */
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/*
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* Macros that return a random number in a specific format.
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*/
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#define SDLTest_RandomInt(c) ((int)SDLTest_Random(c))
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/*
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* Context structure for the random number generator state.
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*/
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typedef struct {
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unsigned int a;
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unsigned int x;
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unsigned int c;
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unsigned int ah;
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unsigned int al;
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} SDLTest_RandomContext;
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/* --- Function prototypes */
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/**
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* \brief Initialize random number generator with two integers.
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*
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* Note: The random sequence of numbers returned by ...Random() is the
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* same for the same two integers and has a period of 2^31.
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*
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* \param rndContext pointer to context structure
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* \param xi integer that defines the random sequence
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* \param ci integer that defines the random sequence
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*
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*/
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void SDLTest_RandomInit(SDLTest_RandomContext * rndContext, unsigned int xi,
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unsigned int ci);
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/**
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* \brief Initialize random number generator based on current system time.
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*
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* \param rndContext pointer to context structure
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*
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*/
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void SDLTest_RandomInitTime(SDLTest_RandomContext *rndContext);
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/**
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* \brief Initialize random number generator based on current system time.
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*
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* Note: ...RandomInit() or ...RandomInitTime() must have been called
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* before using this function.
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*
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* \param rndContext pointer to context structure
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*
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* \returns A random number (32bit unsigned integer)
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*
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*/
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unsigned int SDLTest_Random(SDLTest_RandomContext *rndContext);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include "close_code.h"
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#endif /* _SDL_test_random_h */
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/* vi: set ts=4 sw=4 expandtab: */
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