view src/video/nanox/SDL_nxmouse.c @ 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) 1997-2004 Sam Lantinga
    Copyright (C) 2001  Hsieh-Fu Tsai

    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
    
    Hsieh-Fu Tsai
    clare@setabox.com
*/
#include "SDL_config.h"

#include "../../events/SDL_events_c.h"

#include "SDL_nxmouse_c.h"

// The implementation dependent data for the window manager cursor
struct WMcursor
{
    int unused;
};

WMcursor *
NX_CreateWMCursor(_THIS,
                  Uint8 * data, Uint8 * mask, int w, int h, int hot_x,
                  int hot_y)
{
    WMcursor *cursor;

    Dprintf("enter NX_CreateWMCursor\n");

    cursor = (WMcursor *) SDL_malloc(sizeof(WMcursor));
    if (cursor == NULL) {
        SDL_OutOfMemory();
        return NULL;
    }

    Dprintf("leave NX_CreateWMCursor\n");
    return cursor;
}

void
NX_FreeWMCursor(_THIS, WMcursor * cursor)
{
    Dprintf("NX_FreeWMCursor\n");
    SDL_free(cursor);
    return;
}

void
NX_WarpWMCursor(_THIS, Uint16 x, Uint16 y)
{
    GR_WINDOW_INFO info;

    Dprintf("enter NX_WarpWMCursor\n");
    SDL_Lock_EventThread();

    GrGetWindowInfo(SDL_Window, &info);
    GrMoveCursor(info.x + x, info.y + y);

    SDL_Unlock_EventThread();
    Dprintf("leave NX_WarpWMCursor\n");
}

int
NX_ShowWMCursor(_THIS, WMcursor * cursor)
{
    Dprintf("NX_ShowWMCursor\n");
    return 1;
}

/* vi: set ts=4 sw=4 expandtab: */