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annotate src/libm/s_cos.c @ 2842:97ba0be8b565

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Date: Sat, 06 Dec 2008 15:27:00 +0100 From: Couriersud Subject: SDL: Relative mouse movements The patch below will reenable processing of relative mouse movements. The DirectFB drivers generates those in "grabbed" mode. These ensure, that even in fullscreen mode relative movements are reported. SDLMAME depends on this for games with trackballs. Looking at the code I ask myself whether relative movements should be handled in the drivers (x11, directfb). Both x11 and directfb are able to report relative movements. This would leave it to the driver to use the most appropriate method for relative movements when at the border of a fullscreen window or being "grabbed".
author Sam Lantinga <slouken@libsdl.org>
date Sat, 06 Dec 2008 17:50:50 +0000
parents a98604b691c8
children dc1eb82ffdaa
rev   line source
2756
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1 /* @(#)s_cos.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[] = "$NetBSD: s_cos.c,v 1.7 1995/05/10 20:47:02 jtc Exp $";
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15 #endif
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16
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17 /* cos(x)
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18 * Return cosine function of x.
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19 *
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20 * kernel function:
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21 * __kernel_sin ... sine function on [-pi/4,pi/4]
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22 * __kernel_cos ... cosine function on [-pi/4,pi/4]
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23 * __ieee754_rem_pio2 ... argument reduction routine
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24 *
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25 * Method.
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26 * Let S,C and T denote the sin, cos and tan respectively on
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27 * [-PI/4, +PI/4]. Reduce the argument x to y1+y2 = x-k*pi/2
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28 * in [-pi/4 , +pi/4], and let n = k mod 4.
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29 * We have
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30 *
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31 * n sin(x) cos(x) tan(x)
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32 * ----------------------------------------------------------
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33 * 0 S C T
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34 * 1 C -S -1/T
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35 * 2 -S -C T
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36 * 3 -C S -1/T
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37 * ----------------------------------------------------------
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38 *
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39 * Special cases:
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40 * Let trig be any of sin, cos, or tan.
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41 * trig(+-INF) is NaN, with signals;
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42 * trig(NaN) is that NaN;
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43 *
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44 * Accuracy:
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45 * TRIG(x) returns trig(x) nearly rounded
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46 */
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47
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48 #include "math.h"
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49 #include "math_private.h"
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50
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51 libm_hidden_proto(cos)
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52 #ifdef __STDC__
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53 double cos(double x)
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54 #else
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55 double cos(x)
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56 double x;
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57 #endif
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58 {
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59 double y[2], z = 0.0;
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60 int32_t n, ix;
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61
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62 /* High word of x. */
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63 GET_HIGH_WORD(ix, x);
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64
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65 /* |x| ~< pi/4 */
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66 ix &= 0x7fffffff;
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67 if (ix <= 0x3fe921fb)
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68 return __kernel_cos(x, z);
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69
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70 /* cos(Inf or NaN) is NaN */
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71 else if (ix >= 0x7ff00000)
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72 return x - x;
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73
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74 /* argument reduction needed */
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75 else {
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76 n = __ieee754_rem_pio2(x, y);
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77 switch (n & 3) {
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78 case 0:
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79 return __kernel_cos(y[0], y[1]);
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80 case 1:
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81 return -__kernel_sin(y[0], y[1], 1);
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82 case 2:
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83 return -__kernel_cos(y[0], y[1]);
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84 default:
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85 return __kernel_sin(y[0], y[1], 1);
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86 }
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87 }
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88 }
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89
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90 libm_hidden_def(cos)