Added initial support for RISC OS (thanks Peter Naulls!)
--HG-- extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40631
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Sam Lantinga
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29 changed files with 4002 additions and 5 deletions
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src/joystick/riscos/SDL_sysjoystick.c
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src/joystick/riscos/SDL_sysjoystick.c
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Sam Lantinga
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slouken@devolution.com
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*/
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/*
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RISCOS - Joystick support by Alan Buckley (alan_baa@hotmail.com) - 10 April 2003
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Note: Currently assumes joystick is present if joystick module is loaded
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and that there is one joystick with four buttons.
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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"@(#) $Id$";
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#endif
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/* This is the system specific header for the SDL joystick API */
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#include <stdio.h> /* For the definition of NULL */
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#include <stdlib.h>
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#include "SDL_error.h"
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#include "SDL_joystick.h"
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#include "SDL_sysjoystick.h"
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#include "SDL_joystick_c.h"
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#include "kernel.h"
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#define JOYSTICK_READ 0x43F40
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struct joystick_hwdata
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{
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int joystate;
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};
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/* Function to scan the system for joysticks.
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* This function should set SDL_numjoysticks to the number of available
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* joysticks. Joystick 0 should be the system default joystick.
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* It should return number of joysticks, or -1 on an unrecoverable fatal error.
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*/
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int SDL_SYS_JoystickInit(void)
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{
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_kernel_swi_regs regs;
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/* Try to read joystick 0 */
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regs.r[0] = 0;
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if (_kernel_swi(JOYSTICK_READ, ®s, ®s) == NULL)
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{
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/* Switch works so assume we've got a joystick */
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return 1;
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}
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/* Switch fails so it looks like there's no joystick here */
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return(0);
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}
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/* Function to get the device-dependent name of a joystick */
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const char *SDL_SYS_JoystickName(int index)
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{
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if (index == 0)
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{
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return "RISCOS Joystick 0";
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}
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SDL_SetError("No joystick available with that index");
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return(NULL);
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}
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/* Function to open a joystick for use.
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The joystick to open is specified by the index field of the joystick.
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This should fill the nbuttons and naxes fields of the joystick structure.
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It returns 0, or -1 if there is an error.
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*/
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int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)
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{
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_kernel_swi_regs regs;
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if(!(joystick->hwdata=malloc(sizeof(struct joystick_hwdata))))
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return -1;
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regs.r[0] = joystick->index;
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/* Don't know how to get exact count of buttons so assume max of 4 for now */
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joystick->nbuttons=4;
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joystick->nhats=0;
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joystick->nballs=0;
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joystick->naxes=2;
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joystick->hwdata->joystate=0;
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return 0;
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}
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/* Function to update the state of a joystick - called as a device poll.
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* This function shouldn't update the joystick structure directly,
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* but instead should call SDL_PrivateJoystick*() to deliver events
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* and update joystick device state.
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*/
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void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
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{
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_kernel_swi_regs regs;
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regs.r[0] = joystick->index;
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if (_kernel_swi(JOYSTICK_READ, ®s, ®s) == NULL)
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{
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int newstate = regs.r[0];
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int oldstate = joystick->hwdata->joystate;
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if (newstate != oldstate)
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{
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if ((newstate & 0xFF) != (oldstate & 0xFF))
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{
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int y = regs.r[0] & 0xFF;
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/* Convert to signed values */
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if (y >= 128) y -= 256;
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SDL_PrivateJoystickAxis(joystick,1,-y * 256); /* Up and down opposite to result in SDL */
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}
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if ((newstate & 0xFF00) != (oldstate & 0xFF00))
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{
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int x = (regs.r[0] & 0xFF00) >> 8;
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if (x >= 128) x -= 256;
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SDL_PrivateJoystickAxis(joystick,0,x * 256);
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}
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if ((newstate & 0xFF0000) != (oldstate & 0xFF0000))
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{
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int buttons = (regs.r[0] & 0xFF0000) >> 16;
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int oldbuttons = (oldstate & 0xFF0000) >> 16;
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int i;
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for (i = 0; i < joystick->nbuttons; i++)
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{
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if ((buttons & (1<<i)) != (oldbuttons & (1<<i)))
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{
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if (buttons & (1<<i)) SDL_PrivateJoystickButton(joystick,i,SDL_PRESSED);
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else SDL_PrivateJoystickButton(joystick,i,SDL_RELEASED);
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}
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}
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}
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joystick->hwdata->joystate = newstate;
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}
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}
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return;
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}
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/* Function to close a joystick after use */
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void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
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{
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if(joystick->hwdata)
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free(joystick->hwdata);
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return;
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}
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/* Function to perform any system-specific joystick related cleanup */
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void SDL_SYS_JoystickQuit(void)
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{
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SDL_numjoysticks=0;
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return;
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}
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