Mercurial > sdl-ios-xcode
view src/joystick/SDL_sysjoystick.h @ 911:04a403e4ccf5
Date: Mon, 3 May 2004 03:15:01 +0100
From: David Symmonds
Subject: SDL Typedef Structs
Hi, Thanks for the SDL libraries, I have been using them for about a year
now and they are really brilliant. One thing that I have just found whilst
using them through C++ (and needing forward declarations) is that when you
typedef structs you sometimes use
typedef struct Name
{
...
}Name;
e.g. SDL_Surface
and other times use
typedef struct
{
...
}Name;
e.g. SDL_Rect
The first type works fine, when I define a header file I can just put
'struct Name;' at the top and use the Name throughout. However, the second
type is harder to use in a header, and I haven't found a way yet, other than
to include 'SDL.h' in the header file (undesirable). Would there be any harm
in changing the definition of SDL_Rect and such like to the second form?
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 18 Jul 2004 22:57:40 +0000 |
| parents | b8d311d90021 |
| children | c9b51268668f |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2004 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 */ #ifdef SAVE_RCSID static char rcsid = "@(#) $Id$"; #endif /* This is the system specific header for the SDL joystick API */ #include "SDL_joystick.h" /* The SDL joystick structure */ struct _SDL_Joystick { Uint8 index; /* Device index */ const char *name; /* Joystick name - system dependent */ int naxes; /* Number of axis controls on the joystick */ Sint16 *axes; /* Current axis states */ int nhats; /* Number of hats on the joystick */ Uint8 *hats; /* Current hat states */ int nballs; /* Number of trackballs on the joystick */ struct balldelta { int dx; int dy; } *balls; /* Current ball motion deltas */ int nbuttons; /* Number of buttons on the joystick */ Uint8 *buttons; /* Current button states */ struct joystick_hwdata *hwdata; /* Driver dependent information */ int ref_count; /* Reference count for multiple opens */ }; /* Function to scan the system for joysticks. * Joystick 0 should be the system default joystick. * This function should return the number of available joysticks, or -1 * on an unrecoverable fatal error. */ extern int SDL_SYS_JoystickInit(void); /* Function to get the device-dependent name of a joystick */ extern const char *SDL_SYS_JoystickName(int index); /* Function to open a joystick for use. The joystick to open is specified by the index field of the joystick. This should fill the nbuttons and naxes fields of the joystick structure. It returns 0, or -1 if there is an error. */ extern int SDL_SYS_JoystickOpen(SDL_Joystick *joystick); /* Function to update the state of a joystick - called as a device poll. * This function shouldn't update the joystick structure directly, * but instead should call SDL_PrivateJoystick*() to deliver events * and update joystick device state. */ extern void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick); /* Function to close a joystick after use */ extern void SDL_SYS_JoystickClose(SDL_Joystick *joystick); /* Function to perform any system-specific joystick related cleanup */ extern void SDL_SYS_JoystickQuit(void);