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annotate src/video/gem/SDL_gemmodes.c @ 2752:edd2839b36f7

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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 7e1caa8452f3
children 99210400e8b9
rev   line source
2189
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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 #include "SDL_gemvideo.h"
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25
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26
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27 void
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28 GEM_InitModes(_THIS)
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29 {
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30 SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
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31 Uint32 Rmask, Gmask, Bmask, Amask;
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32 SDL_VideoDisplay display;
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33 SDL_DisplayData *displaydata;
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34 SDL_DisplayMode mode;
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35 int bpp;
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36
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37 /* read vdi bpp, rmask, gmask, bmask, amask */
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38
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39 mode.format = SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
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40 mode.w = 0 /* vdi width */ ;
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41 mode.h = 0 /* vdi height */ ;
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42 mode.refresh_rate = 0;
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43 mode.driverdata = NULL;
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44
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45 displaydata = (SDL_DisplayData *) SDL_malloc(sizeof(*displaydata));
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46 if (!displaydata) {
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47 return;
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48 }
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49 /* fill display data */
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50
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51 SDL_zero(display);
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52 display.desktop_mode = mode;
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53 display.current_mode = mode;
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54 display.driverdata = displaydata;
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55 SDL_AddVideoDisplay(&display);
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56 }
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57
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58 void
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59 GEM_GetDisplayModes(_THIS)
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60 {
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61 SDL_DisplayData *data = (SDL_DisplayData *) SDL_CurrentDisplay.driverdata;
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62 SDL_DisplayMode mode;
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63 //SDL_AddDisplayMode(_this->current_display, &mode);
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64 }
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65
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66 int
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67 GEM_SetDisplayMode(_THIS, SDL_DisplayMode * mode)
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68 {
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69 //SDL_DisplayModeData *data = (SDL_DisplayModeData *) mode->driverdata;
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70 return -1;
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71 }
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72
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73 void
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74 GEM_QuitModes(_THIS)
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75 {
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76 }
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77
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78 /* vi: set ts=4 sw=4 expandtab: */