Mercurial > sdl-ios-xcode
view src/video/photon/SDL_ph_wm.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 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2006 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" #include <Ph.h> #include <photon/PpProto.h> #include <photon/PhWm.h> #include <photon/wmapi.h> #include "SDL_version.h" #include "SDL_timer.h" #include "SDL_video.h" #include "SDL_syswm.h" #include "../SDL_pixels_c.h" #include "../../events/SDL_events_c.h" #include "SDL_ph_modes_c.h" #include "SDL_ph_wm_c.h" void ph_SetIcon(_THIS, SDL_Surface * icon, Uint8 * mask) { return; } /* Set window caption */ void ph_SetCaption(_THIS, const char *title, const char *icon) { SDL_Lock_EventThread(); /* sanity check for set caption call before window init */ if (window != NULL) { PtSetResource(window, Pt_ARG_WINDOW_TITLE, title, 0); } SDL_Unlock_EventThread(); } /* Iconify current window */ int ph_IconifyWindow(_THIS) { PhWindowEvent_t windowevent; SDL_Lock_EventThread(); SDL_memset(&windowevent, 0, sizeof(windowevent)); windowevent.event_f = Ph_WM_HIDE; windowevent.event_state = Ph_WM_EVSTATE_HIDE; windowevent.rid = PtWidgetRid(window); PtForwardWindowEvent(&windowevent); SDL_Unlock_EventThread(); return 0; } SDL_GrabMode ph_GrabInputNoLock(_THIS, SDL_GrabMode mode) { short abs_x, abs_y; if (mode == SDL_GRAB_OFF) { PtSetResource(window, Pt_ARG_WINDOW_STATE, Pt_FALSE, Ph_WM_STATE_ISALTKEY); } else { PtSetResource(window, Pt_ARG_WINDOW_STATE, Pt_TRUE, Ph_WM_STATE_ISALTKEY); PtGetAbsPosition(window, &abs_x, &abs_y); PhMoveCursorAbs(PhInputGroup(NULL), abs_x + SDL_VideoSurface->w / 2, abs_y + SDL_VideoSurface->h / 2); } SDL_Unlock_EventThread(); return (mode); } SDL_GrabMode ph_GrabInput(_THIS, SDL_GrabMode mode) { SDL_Lock_EventThread(); mode = ph_GrabInputNoLock(this, mode); SDL_Unlock_EventThread(); return (mode); } int ph_GetWMInfo(_THIS, SDL_SysWMinfo * info) { if (info->version.major <= SDL_MAJOR_VERSION) { return 1; } else { SDL_SetError("Application not compiled with SDL %d.%d\n", SDL_MAJOR_VERSION, SDL_MINOR_VERSION); return -1; } } /* vi: set ts=4 sw=4 expandtab: */