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https://github.com/Relintai/sdl2_frt.git
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0e45984fa0
The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly uninitialized data structure if loading the library first failed. A later try to use EGL then skipped initialization and assumed it was previously successful because the data structure now already existed. This led to at least one crash in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was dereferenced to make a call to eglBindAPI().
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/* @(#)k_sin.c 5.1 93/09/24 */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#if defined(LIBM_SCCS) && !defined(lint)
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static const char rcsid[] =
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"$NetBSD: k_sin.c,v 1.8 1995/05/10 20:46:31 jtc Exp $";
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#endif
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/* __kernel_sin( x, y, iy)
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* kernel sin function on [-pi/4, pi/4], pi/4 ~ 0.7854
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* Input x is assumed to be bounded by ~pi/4 in magnitude.
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* Input y is the tail of x.
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* Input iy indicates whether y is 0. (if iy=0, y assume to be 0).
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*
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* Algorithm
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* 1. Since sin(-x) = -sin(x), we need only to consider positive x.
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* 2. if x < 2^-27 (hx<0x3e400000 0), return x with inexact if x!=0.
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* 3. sin(x) is approximated by a polynomial of degree 13 on
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* [0,pi/4]
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* 3 13
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* sin(x) ~ x + S1*x + ... + S6*x
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* where
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*
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* |sin(x) 2 4 6 8 10 12 | -58
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* |----- - (1+S1*x +S2*x +S3*x +S4*x +S5*x +S6*x )| <= 2
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* | x |
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*
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* 4. sin(x+y) = sin(x) + sin'(x')*y
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* ~ sin(x) + (1-x*x/2)*y
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* For better accuracy, let
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* 3 2 2 2 2
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* r = x *(S2+x *(S3+x *(S4+x *(S5+x *S6))))
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* then 3 2
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* sin(x) = x + (S1*x + (x *(r-y/2)+y))
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*/
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#include "math_libm.h"
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#include "math_private.h"
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#ifdef __STDC__
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static const double
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#else
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static double
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#endif
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half = 5.00000000000000000000e-01, /* 0x3FE00000, 0x00000000 */
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S1 = -1.66666666666666324348e-01, /* 0xBFC55555, 0x55555549 */
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S2 = 8.33333333332248946124e-03, /* 0x3F811111, 0x1110F8A6 */
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S3 = -1.98412698298579493134e-04, /* 0xBF2A01A0, 0x19C161D5 */
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S4 = 2.75573137070700676789e-06, /* 0x3EC71DE3, 0x57B1FE7D */
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S5 = -2.50507602534068634195e-08, /* 0xBE5AE5E6, 0x8A2B9CEB */
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S6 = 1.58969099521155010221e-10; /* 0x3DE5D93A, 0x5ACFD57C */
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#ifdef __STDC__
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double attribute_hidden
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__kernel_sin(double x, double y, int iy)
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#else
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double attribute_hidden
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__kernel_sin(x, y, iy)
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double x, y;
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int iy; /* iy=0 if y is zero */
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#endif
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{
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double z, r, v;
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int32_t ix;
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GET_HIGH_WORD(ix, x);
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ix &= 0x7fffffff; /* high word of x */
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if (ix < 0x3e400000) { /* |x| < 2**-27 */
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if ((int) x == 0)
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return x;
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} /* generate inexact */
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z = x * x;
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v = z * x;
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r = S2 + z * (S3 + z * (S4 + z * (S5 + z * S6)));
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if (iy == 0)
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return x + v * (S1 + z * r);
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else
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return x - ((z * (half * y - v * r) - y) - v * S1);
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}
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