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annotate src/libm/math.h @ 2844:70b63882d2ef

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The YCbCr texture extension works now that bytes_per_pixel() returns the correct value for YUV textures. Yay! I'm still cheering for Ryan's pixel shader instead, since once it works different shaders can handle all the YUV formats.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 06 Dec 2008 18:37:06 +0000
parents 2a46b5912665
children 99210400e8b9
rev   line source
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a98604b691c8 Expanded the libm support and put it into a separate directory.
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
a98604b691c8 Expanded the libm support and put it into a separate directory.
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #ifdef HAVE_MATH_H
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25 #define _USE_MATH_DEFINES
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26 #include <math.h>
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27 #else
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28
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29 /* Math routines from uClibc: http://www.uclibc.org */
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30
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31 #define M_PI 3.14159265358979323846264338327950288 /* pi */
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32
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33 extern double __ieee754_log(double x);
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34 extern double __ieee754_pow(double x, double y);
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35 extern double __ieee754_sqrt(double x);
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36
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37 #define log(x) __ieee754_log(x)
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38 #define pow(x, y) __ieee754_pow(x, y)
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39 #define sqrt(x) __ieee754_sqrt(x)
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40
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41 extern double copysign(double x, double y);
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42 extern double cos(double x);
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43 extern double fabs(double x);
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44 extern double floor(double x);
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45 extern double scalbn(double x, int n);
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46 extern double sin(double x);
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47
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48 #define sinf(x) (float)sin((double)x)
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49 #define cosf(x) (float)cos((double)x)
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50
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51 #endif /* HAVE_MATH_H */
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52
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53 /* vi: set ts=4 sw=4 expandtab: */