Mercurial > sdl-ios-xcode
annotate src/video/cocoa/SDL_cocoaopengl.h @ 2752:edd2839b36f7
http://sources.redhat.com/ml/newlib/2002/msg00230.html
Stephen L Moshier wrote:
>
> pow(x,y) returns 0 when x is very close to -1.0 and y is very large.
> The following test program prints
>
> pow(1.0000000000000002e+00 4.5035996273704970e+15) = 2.7182818284590455e+00
> pow(-1.0000000000000002e+00 4.5035996273704970e+15) =0.0000000000000000e+00
> pow(9.9999999999999978e-01 4.5035996273704970e+15) = 3.6787944117144222e-01
> pow(-9.9999999999999978e-01 4.5035996273704970e+15) = 0.0000000000000000e+00
>
> which is incorrect for the negative arguments raised to an odd integer
> power.
>
> -----
> double pow (double, double);
>
> int
> main ()
> {
> double x, y, z;
>
> x = 1.0 + pow (2.0, -52.0);
> y = 1.0 + pow (2.0, 52.0);
> z = pow (x, y);
> printf ("pow(%.16e %.16e) = %.16e\n", x, y, z);
> x = -x;
> z = pow (x, y);
> printf ("pow(%.16e %.16e) = %.16e\n", x, y, z);
> x = 1.0 - pow (2.0, -52.0);
> z = pow (x, y);
> printf ("pow(%.16e %.16e) = %.16e\n", x, y, z);
> x = -x;
> z = pow (x, y);
> printf ("pow(%.16e %.16e) = %.16e\n", x, y, z);
> }
> -----
>
> Here is a patch for newlib/libm/math/epow.c:
Patch checked in and duplicated for ef_pow.c. Thanks.
-- Jeff J.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 15 Sep 2008 04:31:30 +0000 |
| parents | 420716272158 |
| children | 99210400e8b9 |
| rev | line source |
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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 |
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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 #ifndef _SDL_cocoaopengl_h |
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25 #define _SDL_cocoaopengl_h |
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26 |
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27 #if SDL_VIDEO_OPENGL_CGL |
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28 |
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29 struct SDL_GLDriverData |
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30 { |
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31 int initialized; |
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32 }; |
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33 |
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34 /* OpenGL functions */ |
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35 extern int Cocoa_GL_LoadLibrary(_THIS, const char *path); |
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36 extern void *Cocoa_GL_GetProcAddress(_THIS, const char *proc); |
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37 extern int Cocoa_GL_SetupWindow(_THIS, SDL_Window * window); |
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38 extern void Cocoa_GL_CleanupWindow(_THIS, SDL_Window * window); |
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39 extern SDL_GLContext Cocoa_GL_CreateContext(_THIS, SDL_Window * window); |
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40 extern int Cocoa_GL_MakeCurrent(_THIS, SDL_Window * window, |
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41 SDL_GLContext context); |
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42 extern int Cocoa_GL_SetSwapInterval(_THIS, int interval); |
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43 extern int Cocoa_GL_GetSwapInterval(_THIS); |
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44 extern void Cocoa_GL_SwapWindow(_THIS, SDL_Window * window); |
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45 extern void Cocoa_GL_DeleteContext(_THIS, SDL_GLContext context); |
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46 |
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1952
420716272158
Implemented X11 OpenGL support.
Sam Lantinga <slouken@libsdl.org>
parents:
1936
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47 #endif /* SDL_VIDEO_OPENGL_CGL */ |
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48 |
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49 #endif /* _SDL_cocoaopengl_h */ |
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50 |
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51 /* vi: set ts=4 sw=4 expandtab: */ |