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annotate src/libm/s_copysign.c @ 2866:e532417a6977

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Fixed SDL 1.2 compatibility problem. The API specifies that SDL_OpenAudio() will fill out the 'desired' audio spec with the correct samples and size set by the driver. This value is important since it may be used by applications that size audio buffers, etc. However, we want to allow advanced applications to call SDL_OpenAudioDevice() which gets passed a const 'desired' parameter, and have the correct data filled into the 'obtained' parameter, possibly allowing or not allowing format changes. So... 'obtained' becomes the audio format the user callback is expected to use, and we add flags to allow the application to specify which format changes are allowed. Note: We really need to add a way to query the 'obtained' audio spec.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 13 Dec 2008 06:36:47 +0000
parents a98604b691c8
children dc1eb82ffdaa
rev   line source
2756
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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14 static 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)