view src/video/os2fslib/SDL_os2fslib.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 c121d94672cb
children 99210400e8b9
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#ifndef _SDL_os2fslib_h
#define _SDL_os2fslib_h


// OS2 specific includes
#define INCL_TYPES
#define INCL_DOS
#define INCL_DOSERRORS
#define INCL_DOSPROCESS
#define INCL_WIN
#define INCL_GPI
#include <os2.h>

#include <FSLib.h>

/* Hidden "this" pointer for the video functions */
#define _THIS	SDL_VideoDevice *_this

/* Private display data */
struct SDL_PrivateVideoData
{
    FSLib_VideoMode_p pAvailableFSLibVideoModes;
    SDL_Rect **pListModesResult;        // Allocated memory to return list of modes for os2fslib_ListModes() API

    FSLib_VideoMode SrcBufferDesc;      // Description of current source image buffer
    char *pchSrcBuffer;         // The source image buffer itself
    SDL_Surface *pSDLSurface;   // The SDL surface describing the buffer
    HMTX hmtxUseSrcBuffer;      // Mutex semaphore to manipulate src buffer
    HWND hwndFrame, hwndClient; // Window handle of frame and client
    int iPMThreadStatus;        // 0: Not running
    // 1: Running
    // Other: Not running, had an error
    int tidPMThread;            // Thread ID of PM Thread
    int fInFocus;               // True if we're in focus!
    int iSkipWMMOUSEMOVE;       // Number of WM_MOUSEMOVE messages to skip!
    int iMouseVisible;          //

    PFNWP pfnOldFrameProc;      // Old window frame procedure
    int bProportionalResize;    // 0: No proportional resizing
    // 1: Do proportional resizing
    ULONG ulResizingFlag;       // First resizing flag value
};

/* OS/2 specific backdoor function to be able to set FrameControlFlags of */
/* the SDL window before creating it. */
extern DECLSPEC void SDLCALL SDL_OS2FSLIB_SetFCFToUse(ULONG ulFCF);

#endif /* _SDL_os2fslib_h */
/* vi: set ts=4 sw=4 expandtab: */