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SDL_test_random.h
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
4 
5  This software is provided 'as-is', without any express or implied
6  warranty. In no event will the authors be held liable for any damages
7  arising from the use of this software.
8 
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12 
13  1. The origin of this software must not be misrepresented; you must not
14  claim that you wrote the original software. If you use this software
15  in a product, an acknowledgment in the product documentation would be
16  appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18  misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20 */
21 
30 /*
31 
32  A "32-bit Multiply with carry random number generator. Very fast.
33  Includes a list of recommended multipliers.
34 
35  multiply-with-carry generator: x(n) = a*x(n-1) + carry mod 2^32.
36  period: (a*2^31)-1
37 
38 */
39 
40 #ifndef _SDL_test_random_h
41 #define _SDL_test_random_h
42 
43 #include "begin_code.h"
44 /* Set up for C function definitions, even when using C++ */
45 #ifdef __cplusplus
46 extern "C" {
47 #endif
48 
49 /* --- Definitions */
50 
51 /*
52  * Macros that return a random number in a specific format.
53  */
54 #define SDLTest_RandomInt(c) ((int)SDLTest_Random(c))
55 
56 /*
57  * Context structure for the random number generator state.
58  */
59  typedef struct {
60  unsigned int a;
61  unsigned int x;
62  unsigned int c;
63  unsigned int ah;
64  unsigned int al;
65  } SDLTest_RandomContext;
66 
67 
68 /* --- Function prototypes */
69 
81  void SDLTest_RandomInit(SDLTest_RandomContext * rndContext, unsigned int xi,
82  unsigned int ci);
83 
90  void SDLTest_RandomInitTime(SDLTest_RandomContext *rndContext);
91 
92 
104  unsigned int SDLTest_Random(SDLTest_RandomContext *rndContext);
105 
106 
107 /* Ends C function definitions when using C++ */
108 #ifdef __cplusplus
109 }
110 #endif
111 #include "close_code.h"
112 
113 #endif /* _SDL_test_random_h */
114 
115 /* vi: set ts=4 sw=4 expandtab: */
SDLTest_RandomContext::a
unsigned int a
Definition: SDL_test_random.h:60
begin_code.h
SDLTest_RandomContext::ah
unsigned int ah
Definition: SDL_test_random.h:63
SDLTest_RandomInit
void SDLTest_RandomInit(SDLTest_RandomContext *rndContext, unsigned int xi, unsigned int ci)
Initialize random number generator with two integers.
Definition: SDL_test_random.c:41
SDLTest_RandomContext::c
unsigned int c
Definition: SDL_test_random.h:62
SDLTest_RandomInitTime
void SDLTest_RandomInitTime(SDLTest_RandomContext *rndContext)
Initialize random number generator based on current system time.
Definition: SDL_test_random.c:65
close_code.h
SDLTest_RandomContext::x
unsigned int x
Definition: SDL_test_random.h:61
rndContext
static SDLTest_RandomContext rndContext
Definition: SDL_test_fuzzer.c:54
SDLTest_RandomContext
Definition: SDL_test_random.h:59
SDLTest_Random
unsigned int SDLTest_Random(SDLTest_RandomContext *rndContext)
Initialize random number generator based on current system time.
Definition: SDL_test_random.c:80
SDLTest_RandomContext::al
unsigned int al
Definition: SDL_test_random.h:64