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author Miodrag Milanovic <mmicko@gmail.com>2016-02-27 16:28:05 +0100
committer Miodrag Milanovic <mmicko@gmail.com>2016-02-27 16:53:49 +0100
commitcf6dc7d370407914020f3e623719f09c8668c692 (patch)
tree46b3416d091b4c09b50fba7ffcbd310aed032cc8 /3rdparty/SDL2/src/test/SDL_test_random.c
parent64135e73f973d9b95beb0c60b65feb34fbfec64a (diff)
Placed SDL2 source since we need it on some platforms (nw)
Diffstat (limited to '3rdparty/SDL2/src/test/SDL_test_random.c')
-rw-r--r--3rdparty/SDL2/src/test/SDL_test_random.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/3rdparty/SDL2/src/test/SDL_test_random.c b/3rdparty/SDL2/src/test/SDL_test_random.c
new file mode 100644
index 00000000000..c5baaa640f3
--- /dev/null
+++ b/3rdparty/SDL2/src/test/SDL_test_random.c
@@ -0,0 +1,94 @@
+/*
+ Simple DirectMedia Layer
+ Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
+
+ 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.
+*/
+
+/*
+
+ A portable "32-bit Multiply with carry" random number generator.
+
+ Used by the fuzzer component.
+ Original source code contributed by A. Schiffler for GSOC project.
+
+*/
+
+#include "SDL_config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+#include "SDL_test.h"
+
+/* Initialize random number generator with two integer variables */
+
+void SDLTest_RandomInit(SDLTest_RandomContext * rndContext, unsigned int xi, unsigned int ci)
+{
+ if (rndContext==NULL) return;
+
+ /*
+ * Choose a value for 'a' from this list
+ * 1791398085 1929682203 1683268614 1965537969 1675393560
+ * 1967773755 1517746329 1447497129 1655692410 1606218150
+ * 2051013963 1075433238 1557985959 1781943330 1893513180
+ * 1631296680 2131995753 2083801278 1873196400 1554115554
+ */
+ rndContext->a = 1655692410;
+ rndContext->x = 30903;
+ rndContext->c = 0;
+ if (xi != 0) {
+ rndContext->x = xi;
+ }
+ rndContext->c = ci;
+ rndContext->ah = rndContext->a >> 16;
+ rndContext->al = rndContext->a & 65535;
+}
+
+/* Initialize random number generator from system time */
+
+void SDLTest_RandomInitTime(SDLTest_RandomContext * rndContext)
+{
+ int a, b;
+
+ if (rndContext==NULL) return;
+
+ srand((unsigned int)time(NULL));
+ a=rand();
+ srand(clock());
+ b=rand();
+ SDLTest_RandomInit(rndContext, a, b);
+}
+
+/* Returns random numbers */
+
+unsigned int SDLTest_Random(SDLTest_RandomContext * rndContext)
+{
+ unsigned int xh, xl;
+
+ if (rndContext==NULL) return -1;
+
+ xh = rndContext->x >> 16, xl = rndContext->x & 65535;
+ rndContext->x = rndContext->x * rndContext->a + rndContext->c;
+ rndContext->c =
+ xh * rndContext->ah + ((xh * rndContext->al) >> 16) +
+ ((xl * rndContext->ah) >> 16);
+ if (xl * rndContext->al >= (~rndContext->c + 1))
+ rndContext->c++;
+ return (rndContext->x);
+}