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Diffstat (limited to 'distrib/sdl-1.2.15/src/joystick/riscos/SDL_sysjoystick.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/joystick/riscos/SDL_sysjoystick.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/joystick/riscos/SDL_sysjoystick.c b/distrib/sdl-1.2.15/src/joystick/riscos/SDL_sysjoystick.c new file mode 100644 index 0000000..214d4c7 --- /dev/null +++ b/distrib/sdl-1.2.15/src/joystick/riscos/SDL_sysjoystick.c @@ -0,0 +1,176 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2012 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" + +#ifdef SDL_JOYSTICK_RISCOS + +/* + RISC OS - Joystick support by Alan Buckley (alan_baa@hotmail.com) - 10 April 2003 + + Note: Currently assumes joystick is present if joystick module is loaded + and that there is one joystick with four buttons. +*/ + +/* This is the system specific header for the SDL joystick API */ + +#include "SDL_events.h" +#include "SDL_joystick.h" +#include "../SDL_sysjoystick.h" +#include "../SDL_joystick_c.h" + +#include "kernel.h" + +#define JOYSTICK_READ 0x43F40 + +struct joystick_hwdata +{ + int joystate; +}; + + +/* Function to scan the system for joysticks. + * This function should set SDL_numjoysticks to the number of available + * joysticks. Joystick 0 should be the system default joystick. + * It should return number of joysticks, or -1 on an unrecoverable fatal error. + */ +int SDL_SYS_JoystickInit(void) +{ + _kernel_swi_regs regs; + + /* Try to read joystick 0 */ + regs.r[0] = 0; + if (_kernel_swi(JOYSTICK_READ, ®s, ®s) == NULL) + { + /* Switch works so assume we've got a joystick */ + return 1; + } + /* Switch fails so it looks like there's no joystick here */ + + return(0); +} + +/* Function to get the device-dependent name of a joystick */ +const char *SDL_SYS_JoystickName(int index) +{ + if (index == 0) + { + return "RISC OS Joystick 0"; + } + + SDL_SetError("No joystick available with that index"); + return(NULL); +} + +/* 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. + */ +int SDL_SYS_JoystickOpen(SDL_Joystick *joystick) +{ + _kernel_swi_regs regs; + + if(!(joystick->hwdata=SDL_malloc(sizeof(struct joystick_hwdata)))) + return -1; + + regs.r[0] = joystick->index; + + /* Don't know how to get exact count of buttons so assume max of 4 for now */ + joystick->nbuttons=4; + + joystick->nhats=0; + joystick->nballs=0; + joystick->naxes=2; + joystick->hwdata->joystate=0; + + return 0; + +} + +/* 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. + */ +void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick) +{ + _kernel_swi_regs regs; + regs.r[0] = joystick->index; + + if (_kernel_swi(JOYSTICK_READ, ®s, ®s) == NULL) + { + int newstate = regs.r[0]; + int oldstate = joystick->hwdata->joystate; + if (newstate != oldstate) + { + if ((newstate & 0xFF) != (oldstate & 0xFF)) + { + int y = regs.r[0] & 0xFF; + /* Convert to signed values */ + if (y >= 128) y -= 256; + SDL_PrivateJoystickAxis(joystick,1,-y * 256); /* Up and down opposite to result in SDL */ + } + if ((newstate & 0xFF00) != (oldstate & 0xFF00)) + { + int x = (regs.r[0] & 0xFF00) >> 8; + if (x >= 128) x -= 256; + SDL_PrivateJoystickAxis(joystick,0,x * 256); + } + + if ((newstate & 0xFF0000) != (oldstate & 0xFF0000)) + { + int buttons = (regs.r[0] & 0xFF0000) >> 16; + int oldbuttons = (oldstate & 0xFF0000) >> 16; + int i; + for (i = 0; i < joystick->nbuttons; i++) + { + if ((buttons & (1<<i)) != (oldbuttons & (1<<i))) + { + if (buttons & (1<<i)) SDL_PrivateJoystickButton(joystick,i,SDL_PRESSED); + else SDL_PrivateJoystickButton(joystick,i,SDL_RELEASED); + } + } + } + joystick->hwdata->joystate = newstate; + } + } + + return; +} + +/* Function to close a joystick after use */ +void SDL_SYS_JoystickClose(SDL_Joystick *joystick) +{ + if(joystick->hwdata) + SDL_free(joystick->hwdata); + return; +} + +/* Function to perform any system-specific joystick related cleanup */ +void SDL_SYS_JoystickQuit(void) +{ + SDL_numjoysticks=0; + + return; +} + +#endif /* SDL_JOYSTICK_RISCOS */ |