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annotate src/libm/s_copysign.c @ 3409:c8f580ebc96a

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Adam Strzelecki to SDL Sending a patch for fullscreen Mac OS X SDL 1.3 (SVN) Cocoa mouse position handling. In fullscreen mouse coordinates should be relative to SCREEN not to the window, which doesn't really occupy fullscreen. Without this patch mouse position (especially Y) was totally incorrect (shifted) in fullscreen.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 22 Oct 2009 04:46:11 +0000
parents dc1eb82ffdaa
children
rev   line source
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a98604b691c8 Expanded the libm support and put it into a separate directory.
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1 /* @(#)s_copysign.c 5.1 93/09/24 */
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2 /*
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3 * ====================================================
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4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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5 *
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6 * Developed at SunPro, a Sun Microsystems, Inc. business.
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7 * Permission to use, copy, modify, and distribute this
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8 * software is freely granted, provided that this notice
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9 * is preserved.
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10 * ====================================================
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11 */
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12
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13 #if defined(LIBM_SCCS) && !defined(lint)
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dc1eb82ffdaa Von: Thomas Zimmermann
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14 static const char rcsid[] =
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15 "$NetBSD: s_copysign.c,v 1.8 1995/05/10 20:46:57 jtc Exp $";
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16 #endif
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17
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18 /*
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19 * copysign(double x, double y)
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20 * copysign(x,y) returns a value with the magnitude of x and
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21 * with the sign bit of y.
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22 */
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23
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24 #include "math.h"
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25 #include "math_private.h"
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26
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27 libm_hidden_proto(copysign)
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28 #ifdef __STDC__
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29 double copysign(double x, double y)
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30 #else
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31 double copysign(x, y)
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32 double x, y;
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33 #endif
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34 {
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35 u_int32_t hx, hy;
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36 GET_HIGH_WORD(hx, x);
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37 GET_HIGH_WORD(hy, y);
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38 SET_HIGH_WORD(x, (hx & 0x7fffffff) | (hy & 0x80000000));
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39 return x;
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40 }
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41
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42 libm_hidden_def(copysign)