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Diffstat (limited to 'distrib/sdl-1.2.15/src/joystick/SDL_joystick.c')
-rw-r--r--distrib/sdl-1.2.15/src/joystick/SDL_joystick.c606
1 files changed, 606 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/joystick/SDL_joystick.c b/distrib/sdl-1.2.15/src/joystick/SDL_joystick.c
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index 0000000..083b017
--- /dev/null
+++ b/distrib/sdl-1.2.15/src/joystick/SDL_joystick.c
@@ -0,0 +1,606 @@
+/*
+ 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"
+
+/* This is the joystick API for Simple DirectMedia Layer */
+
+#include "SDL_events.h"
+#include "SDL_sysjoystick.h"
+#include "SDL_joystick_c.h"
+#if !SDL_EVENTS_DISABLED
+#include "../events/SDL_events_c.h"
+#endif
+
+/* This is used for Quake III Arena */
+#if SDL_EVENTS_DISABLED
+#define SDL_Lock_EventThread()
+#define SDL_Unlock_EventThread()
+#endif
+
+Uint8 SDL_numjoysticks = 0;
+int SDL_allocatedjoysticks = 0;
+SDL_Joystick **SDL_joysticks = NULL;
+
+int SDL_JoystickInit(void)
+{
+ int arraylen;
+ int status;
+
+ SDL_numjoysticks = 0;
+ status = SDL_SYS_JoystickInit();
+ if ( status >= 0 ) {
+ SDL_allocatedjoysticks = status;
+ arraylen = (SDL_allocatedjoysticks+1)*sizeof(*SDL_joysticks);
+ SDL_joysticks = (SDL_Joystick **)SDL_malloc(arraylen);
+ if ( SDL_joysticks == NULL ) {
+ SDL_numjoysticks = 0;
+ SDL_allocatedjoysticks = 0;
+ } else {
+ SDL_memset(SDL_joysticks, 0, arraylen);
+ SDL_numjoysticks = status;
+ }
+ status = 0;
+ }
+ return(status);
+}
+
+/*
+ * Count the number of joysticks attached to the system
+ */
+int SDL_NumJoysticks(void)
+{
+ return SDL_numjoysticks;
+}
+
+/*
+ * Get the implementation dependent name of a joystick
+ */
+const char *SDL_JoystickName(int device_index)
+{
+ if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) {
+ SDL_SetError("There are %d joysticks available",
+ SDL_numjoysticks);
+ return(NULL);
+ }
+ return(SDL_SYS_JoystickName(device_index));
+}
+
+/*
+ * Open a joystick for use - the index passed as an argument refers to
+ * the N'th joystick on the system. This index is the value which will
+ * identify this joystick in future joystick events.
+ *
+ * This function returns a joystick identifier, or NULL if an error occurred.
+ */
+SDL_Joystick *SDL_JoystickOpen(int device_index)
+{
+ int i;
+ SDL_Joystick *joystick;
+
+ if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) {
+ SDL_SetError("There are %d joysticks available",
+ SDL_numjoysticks);
+ return(NULL);
+ }
+
+ /* If the joystick is already open, return it */
+ for ( i=0; SDL_joysticks[i]; ++i ) {
+ if ( device_index == SDL_joysticks[i]->index ) {
+ joystick = SDL_joysticks[i];
+ ++joystick->ref_count;
+ return(joystick);
+ }
+ }
+
+ /* Create and initialize the joystick */
+ joystick = (SDL_Joystick *)SDL_malloc((sizeof *joystick));
+ if ( !joystick ) {
+ SDL_OutOfMemory();
+ return(NULL);
+ }
+
+ SDL_memset(joystick, 0, (sizeof *joystick));
+ joystick->index = device_index;
+ if ( SDL_SYS_JoystickOpen(joystick) < 0 ) {
+ SDL_free(joystick);
+ return(NULL);
+ }
+
+ if ( joystick->naxes > 0 ) {
+ joystick->axes = (Sint16 *)SDL_malloc
+ (joystick->naxes*sizeof(Sint16));
+ }
+ if ( joystick->nhats > 0 ) {
+ joystick->hats = (Uint8 *)SDL_malloc
+ (joystick->nhats*sizeof(Uint8));
+ }
+ if ( joystick->nballs > 0 ) {
+ joystick->balls = (struct balldelta *)SDL_malloc
+ (joystick->nballs*sizeof(*joystick->balls));
+ }
+ if ( joystick->nbuttons > 0 ) {
+ joystick->buttons = (Uint8 *)SDL_malloc
+ (joystick->nbuttons*sizeof(Uint8));
+ }
+ if ( ((joystick->naxes > 0) && !joystick->axes)
+ || ((joystick->nhats > 0) && !joystick->hats)
+ || ((joystick->nballs > 0) && !joystick->balls)
+ || ((joystick->nbuttons > 0) && !joystick->buttons)) {
+ SDL_OutOfMemory();
+ SDL_JoystickClose(joystick);
+ return(NULL);
+ }
+
+ if ( joystick->axes ) {
+ SDL_memset(joystick->axes, 0,
+ joystick->naxes*sizeof(Sint16));
+ }
+ if ( joystick->hats ) {
+ SDL_memset(joystick->hats, 0,
+ joystick->nhats*sizeof(Uint8));
+ }
+ if ( joystick->balls ) {
+ SDL_memset(joystick->balls, 0,
+ joystick->nballs*sizeof(*joystick->balls));
+ }
+ if ( joystick->buttons ) {
+ SDL_memset(joystick->buttons, 0,
+ joystick->nbuttons*sizeof(Uint8));
+ }
+
+ /* Add joystick to list */
+ ++joystick->ref_count;
+ SDL_Lock_EventThread();
+ for ( i=0; SDL_joysticks[i]; ++i )
+ /* Skip to next joystick */ ;
+ SDL_joysticks[i] = joystick;
+ SDL_Unlock_EventThread();
+
+ return(joystick);
+}
+
+/*
+ * Returns 1 if the joystick has been opened, or 0 if it has not.
+ */
+int SDL_JoystickOpened(int device_index)
+{
+ int i, opened;
+
+ opened = 0;
+ for ( i=0; SDL_joysticks[i]; ++i ) {
+ if ( SDL_joysticks[i]->index == (Uint8)device_index ) {
+ opened = 1;
+ break;
+ }
+ }
+ return(opened);
+}
+
+static int ValidJoystick(SDL_Joystick **joystick)
+{
+ int valid;
+
+ if ( *joystick == NULL ) {
+ SDL_SetError("Joystick hasn't been opened yet");
+ valid = 0;
+ } else {
+ valid = 1;
+ }
+ return valid;
+}
+
+/*
+ * Get the device index of an opened joystick.
+ */
+int SDL_JoystickIndex(SDL_Joystick *joystick)
+{
+ if ( ! ValidJoystick(&joystick) ) {
+ return(-1);
+ }
+ return(joystick->index);
+}
+
+/*
+ * Get the number of multi-dimensional axis controls on a joystick
+ */
+int SDL_JoystickNumAxes(SDL_Joystick *joystick)
+{
+ if ( ! ValidJoystick(&joystick) ) {
+ return(-1);
+ }
+ return(joystick->naxes);
+}
+
+/*
+ * Get the number of hats on a joystick
+ */
+int SDL_JoystickNumHats(SDL_Joystick *joystick)
+{
+ if ( ! ValidJoystick(&joystick) ) {
+ return(-1);
+ }
+ return(joystick->nhats);
+}
+
+/*
+ * Get the number of trackballs on a joystick
+ */
+int SDL_JoystickNumBalls(SDL_Joystick *joystick)
+{
+ if ( ! ValidJoystick(&joystick) ) {
+ return(-1);
+ }
+ return(joystick->nballs);
+}
+
+/*
+ * Get the number of buttons on a joystick
+ */
+int SDL_JoystickNumButtons(SDL_Joystick *joystick)
+{
+ if ( ! ValidJoystick(&joystick) ) {
+ return(-1);
+ }
+ return(joystick->nbuttons);
+}
+
+/*
+ * Get the current state of an axis control on a joystick
+ */
+Sint16 SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis)
+{
+ Sint16 state;
+
+ if ( ! ValidJoystick(&joystick) ) {
+ return(0);
+ }
+ if ( axis < joystick->naxes ) {
+ state = joystick->axes[axis];
+ } else {
+ SDL_SetError("Joystick only has %d axes", joystick->naxes);
+ state = 0;
+ }
+ return(state);
+}
+
+/*
+ * Get the current state of a hat on a joystick
+ */
+Uint8 SDL_JoystickGetHat(SDL_Joystick *joystick, int hat)
+{
+ Uint8 state;
+
+ if ( ! ValidJoystick(&joystick) ) {
+ return(0);
+ }
+ if ( hat < joystick->nhats ) {
+ state = joystick->hats[hat];
+ } else {
+ SDL_SetError("Joystick only has %d hats", joystick->nhats);
+ state = 0;
+ }
+ return(state);
+}
+
+/*
+ * Get the ball axis change since the last poll
+ */
+int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy)
+{
+ int retval;
+
+ if ( ! ValidJoystick(&joystick) ) {
+ return(-1);
+ }
+
+ retval = 0;
+ if ( ball < joystick->nballs ) {
+ if ( dx ) {
+ *dx = joystick->balls[ball].dx;
+ }
+ if ( dy ) {
+ *dy = joystick->balls[ball].dy;
+ }
+ joystick->balls[ball].dx = 0;
+ joystick->balls[ball].dy = 0;
+ } else {
+ SDL_SetError("Joystick only has %d balls", joystick->nballs);
+ retval = -1;
+ }
+ return(retval);
+}
+
+/*
+ * Get the current state of a button on a joystick
+ */
+Uint8 SDL_JoystickGetButton(SDL_Joystick *joystick, int button)
+{
+ Uint8 state;
+
+ if ( ! ValidJoystick(&joystick) ) {
+ return(0);
+ }
+ if ( button < joystick->nbuttons ) {
+ state = joystick->buttons[button];
+ } else {
+ SDL_SetError("Joystick only has %d buttons",joystick->nbuttons);
+ state = 0;
+ }
+ return(state);
+}
+
+/*
+ * Close a joystick previously opened with SDL_JoystickOpen()
+ */
+void SDL_JoystickClose(SDL_Joystick *joystick)
+{
+ int i;
+
+ if ( ! ValidJoystick(&joystick) ) {
+ return;
+ }
+
+ /* First decrement ref count */
+ if ( --joystick->ref_count > 0 ) {
+ return;
+ }
+
+ /* Lock the event queue - prevent joystick polling */
+ SDL_Lock_EventThread();
+
+ SDL_SYS_JoystickClose(joystick);
+
+ /* Remove joystick from list */
+ for ( i=0; SDL_joysticks[i]; ++i ) {
+ if ( joystick == SDL_joysticks[i] ) {
+ SDL_memmove(&SDL_joysticks[i], &SDL_joysticks[i+1],
+ (SDL_allocatedjoysticks-i)*sizeof(joystick));
+ break;
+ }
+ }
+
+ /* Let the event thread keep running */
+ SDL_Unlock_EventThread();
+
+ /* Free the data associated with this joystick */
+ if ( joystick->axes ) {
+ SDL_free(joystick->axes);
+ }
+ if ( joystick->hats ) {
+ SDL_free(joystick->hats);
+ }
+ if ( joystick->balls ) {
+ SDL_free(joystick->balls);
+ }
+ if ( joystick->buttons ) {
+ SDL_free(joystick->buttons);
+ }
+ SDL_free(joystick);
+}
+
+void SDL_JoystickQuit(void)
+{
+ const int numsticks = SDL_numjoysticks;
+ int i;
+
+ /* Stop the event polling */
+ SDL_Lock_EventThread();
+ SDL_numjoysticks = 0;
+ SDL_Unlock_EventThread();
+
+ if (SDL_joysticks != NULL) {
+ for (i = 0; i < numsticks; i++) {
+ SDL_Joystick *stick = SDL_joysticks[i];
+ if (stick && (stick->ref_count >= 1)) {
+ stick->ref_count = 1;
+ SDL_JoystickClose(stick);
+ }
+ }
+ }
+
+ /* Quit the joystick setup */
+ SDL_SYS_JoystickQuit();
+ if ( SDL_joysticks ) {
+ SDL_free(SDL_joysticks);
+ SDL_joysticks = NULL;
+ SDL_allocatedjoysticks = 0;
+ }
+}
+
+
+/* These are global for SDL_sysjoystick.c and SDL_events.c */
+
+int SDL_PrivateJoystickAxis(SDL_Joystick *joystick, Uint8 axis, Sint16 value)
+{
+ int posted;
+
+ /* Make sure we're not getting garbage events */
+ if (axis >= joystick->naxes) {
+ return 0;
+ }
+
+ /* Update internal joystick state */
+ joystick->axes[axis] = value;
+
+ /* Post the event, if desired */
+ posted = 0;
+#if !SDL_EVENTS_DISABLED
+ if ( SDL_ProcessEvents[SDL_JOYAXISMOTION] == SDL_ENABLE ) {
+ SDL_Event event;
+ event.type = SDL_JOYAXISMOTION;
+ event.jaxis.which = joystick->index;
+ event.jaxis.axis = axis;
+ event.jaxis.value = value;
+ if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
+ posted = 1;
+ SDL_PushEvent(&event);
+ }
+ }
+#endif /* !SDL_EVENTS_DISABLED */
+ return(posted);
+}
+
+int SDL_PrivateJoystickHat(SDL_Joystick *joystick, Uint8 hat, Uint8 value)
+{
+ int posted;
+
+ /* Make sure we're not getting garbage events */
+ if (hat >= joystick->nhats) {
+ return 0;
+ }
+
+ /* Update internal joystick state */
+ joystick->hats[hat] = value;
+
+ /* Post the event, if desired */
+ posted = 0;
+#if !SDL_EVENTS_DISABLED
+ if ( SDL_ProcessEvents[SDL_JOYHATMOTION] == SDL_ENABLE ) {
+ SDL_Event event;
+ event.jhat.type = SDL_JOYHATMOTION;
+ event.jhat.which = joystick->index;
+ event.jhat.hat = hat;
+ event.jhat.value = value;
+ if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
+ posted = 1;
+ SDL_PushEvent(&event);
+ }
+ }
+#endif /* !SDL_EVENTS_DISABLED */
+ return(posted);
+}
+
+int SDL_PrivateJoystickBall(SDL_Joystick *joystick, Uint8 ball,
+ Sint16 xrel, Sint16 yrel)
+{
+ int posted;
+
+ /* Make sure we're not getting garbage events */
+ if (ball >= joystick->nballs) {
+ return 0;
+ }
+
+ /* Update internal mouse state */
+ joystick->balls[ball].dx += xrel;
+ joystick->balls[ball].dy += yrel;
+
+ /* Post the event, if desired */
+ posted = 0;
+#if !SDL_EVENTS_DISABLED
+ if ( SDL_ProcessEvents[SDL_JOYBALLMOTION] == SDL_ENABLE ) {
+ SDL_Event event;
+ event.jball.type = SDL_JOYBALLMOTION;
+ event.jball.which = joystick->index;
+ event.jball.ball = ball;
+ event.jball.xrel = xrel;
+ event.jball.yrel = yrel;
+ if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
+ posted = 1;
+ SDL_PushEvent(&event);
+ }
+ }
+#endif /* !SDL_EVENTS_DISABLED */
+ return(posted);
+}
+
+int SDL_PrivateJoystickButton(SDL_Joystick *joystick, Uint8 button, Uint8 state)
+{
+ int posted;
+#if !SDL_EVENTS_DISABLED
+ SDL_Event event;
+
+ switch ( state ) {
+ case SDL_PRESSED:
+ event.type = SDL_JOYBUTTONDOWN;
+ break;
+ case SDL_RELEASED:
+ event.type = SDL_JOYBUTTONUP;
+ break;
+ default:
+ /* Invalid state -- bail */
+ return(0);
+ }
+#endif /* !SDL_EVENTS_DISABLED */
+
+ /* Make sure we're not getting garbage events */
+ if (button >= joystick->nbuttons) {
+ return 0;
+ }
+
+ /* Update internal joystick state */
+ joystick->buttons[button] = state;
+
+ /* Post the event, if desired */
+ posted = 0;
+#if !SDL_EVENTS_DISABLED
+ if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) {
+ event.jbutton.which = joystick->index;
+ event.jbutton.button = button;
+ event.jbutton.state = state;
+ if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
+ posted = 1;
+ SDL_PushEvent(&event);
+ }
+ }
+#endif /* !SDL_EVENTS_DISABLED */
+ return(posted);
+}
+
+void SDL_JoystickUpdate(void)
+{
+ int i;
+
+ for ( i=0; SDL_joysticks[i]; ++i ) {
+ SDL_SYS_JoystickUpdate(SDL_joysticks[i]);
+ }
+}
+
+int SDL_JoystickEventState(int state)
+{
+#if SDL_EVENTS_DISABLED
+ return SDL_IGNORE;
+#else
+ const Uint8 event_list[] = {
+ SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION,
+ SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP,
+ };
+ unsigned int i;
+
+ switch (state) {
+ case SDL_QUERY:
+ state = SDL_IGNORE;
+ for ( i=0; i<SDL_arraysize(event_list); ++i ) {
+ state = SDL_EventState(event_list[i],SDL_QUERY);
+ if ( state == SDL_ENABLE ) {
+ break;
+ }
+ }
+ break;
+ default:
+ for ( i=0; i<SDL_arraysize(event_list); ++i ) {
+ SDL_EventState(event_list[i], state);
+ }
+ break;
+ }
+ return(state);
+#endif /* SDL_EVENTS_DISABLED */
+}