Source

pygame / src / joystick.c

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/*
    pygame - Python Game Library
    Copyright (C) 2000-2001  Pete Shinners

    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

    Pete Shinners
    pete@shinners.org
*/

#define PYGAMEAPI_JOYSTICK_INTERNAL
#include "pygame.h"
#include "pygamedocs.h"


#define JOYSTICK_MAXSTICKS 32
static SDL_Joystick* joystick_stickdata[JOYSTICK_MAXSTICKS] = {NULL};


staticforward PyTypeObject PyJoystick_Type;
static PyObject* PyJoystick_New(int);
#define PyJoystick_Check(x) ((x)->ob_type == &PyJoystick_Type)


static void joy_autoquit(void)
{
	int loop;
	for(loop = 0; loop < JOYSTICK_MAXSTICKS; ++loop)
	{
		if(joystick_stickdata[loop])
		{
			SDL_JoystickClose(joystick_stickdata[loop]);
			joystick_stickdata[loop] = NULL;
		}
	}

	if(SDL_WasInit(SDL_INIT_JOYSTICK))
	{
		SDL_JoystickEventState(SDL_ENABLE);
		SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
	}
}

static PyObject* joy_autoinit(PyObject* self, PyObject* arg)
{
	if(!PyArg_ParseTuple(arg, ""))
		return NULL;

	if(!SDL_WasInit(SDL_INIT_JOYSTICK))
	{
		if(SDL_InitSubSystem(SDL_INIT_JOYSTICK))
			return PyInt_FromLong(0);
		SDL_JoystickEventState(SDL_ENABLE);
		PyGame_RegisterQuit(joy_autoquit);
	}
	return PyInt_FromLong(1);
}


static PyObject* quit(PyObject* self, PyObject* arg)
{
	if(!PyArg_ParseTuple(arg, ""))
		return NULL;

	joy_autoquit();

	RETURN_NONE
}


static PyObject* init(PyObject* self, PyObject* arg)
{
	PyObject* result;
	int istrue;

	if(!PyArg_ParseTuple(arg, ""))
		return NULL;

	result = joy_autoinit(self, arg);
	istrue = PyObject_IsTrue(result);
	Py_DECREF(result);
	if(!istrue)
		return RAISE(PyExc_SDLError, SDL_GetError());

	RETURN_NONE
}


static PyObject* get_init(PyObject* self, PyObject* arg)
{
	if(!PyArg_ParseTuple(arg, ""))
		return NULL;

	return PyInt_FromLong(SDL_WasInit(SDL_INIT_JOYSTICK)!=0);
}



/*joystick object funcs*/


static void joy_dealloc(PyObject* self)
{
	PyObject_DEL(self);
}


static PyObject* Joystick(PyObject* self, PyObject* args)
{
	int id;	
	if(!PyArg_ParseTuple(args, "i", &id))
		return NULL;

	JOYSTICK_INIT_CHECK();

	return PyJoystick_New(id);
}


static PyObject* get_count(PyObject* self, PyObject* args)
{
	if(!PyArg_ParseTuple(args, ""))
		return NULL;

	JOYSTICK_INIT_CHECK();

	return PyInt_FromLong(SDL_NumJoysticks());
}


static PyObject* joy_init(PyObject* self, PyObject* args)
{
	int joy_id = PyJoystick_AsID(self);

	if(!PyArg_ParseTuple(args, ""))
		return NULL;

	JOYSTICK_INIT_CHECK();

	if(!joystick_stickdata[joy_id])
	{
		joystick_stickdata[joy_id] = SDL_JoystickOpen(joy_id);
		if(!joystick_stickdata[joy_id])
			return RAISE(PyExc_SDLError, SDL_GetError());
	}
	RETURN_NONE
}


static PyObject* joy_quit(PyObject* self, PyObject* args)
{
	int joy_id = PyJoystick_AsID(self);

	if(!PyArg_ParseTuple(args, ""))
		return NULL;

	JOYSTICK_INIT_CHECK();

	if(joystick_stickdata[joy_id])
	{
		SDL_JoystickClose(joystick_stickdata[joy_id]);
		joystick_stickdata[joy_id] = NULL;
	}
	RETURN_NONE
}


static PyObject* joy_get_init(PyObject* self, PyObject* args)
{
	int joy_id = PyJoystick_AsID(self);

	if(!PyArg_ParseTuple(args, ""))
		return NULL;

	return PyInt_FromLong(joystick_stickdata[joy_id] != NULL);
}


static PyObject* joy_get_id(PyObject* self, PyObject* args)
{
	int joy_id = PyJoystick_AsID(self);

	if(!PyArg_ParseTuple(args, ""))
		return NULL;
	return PyInt_FromLong(joy_id);
}


static PyObject* joy_get_name(PyObject* self, PyObject* args)
{
	int joy_id = PyJoystick_AsID(self);
	
	if(!PyArg_ParseTuple(args, ""))
		return NULL;

	JOYSTICK_INIT_CHECK();

	return PyString_FromString(SDL_JoystickName(joy_id));
}


static PyObject* joy_get_numaxes(PyObject* self, PyObject* args)
{
	int joy_id = PyJoystick_AsID(self);
	SDL_Joystick* joy = joystick_stickdata[joy_id];

	if(!PyArg_ParseTuple(args, ""))
		return NULL;

	JOYSTICK_INIT_CHECK();
	if(!joy)
		return RAISE(PyExc_SDLError, "Joystick not initialized");

	return PyInt_FromLong(SDL_JoystickNumAxes(joy));
}


static PyObject* joy_get_axis(PyObject* self, PyObject* args)
{
	int joy_id = PyJoystick_AsID(self);
	SDL_Joystick* joy = joystick_stickdata[joy_id];
	int axis, value;
	
	if(!PyArg_ParseTuple(args, "i", &axis))
		return NULL;

	JOYSTICK_INIT_CHECK();
	if(!joy)
		return RAISE(PyExc_SDLError, "Joystick not initialized");
	if(axis < 0 || axis >= SDL_JoystickNumAxes(joy))
		return RAISE(PyExc_SDLError, "Invalid joystick axis");

	value = SDL_JoystickGetAxis(joy, axis);
	return PyFloat_FromDouble(value / 32768.0);
}


static PyObject* joy_get_numbuttons(PyObject* self, PyObject* args)
{
	int joy_id = PyJoystick_AsID(self);
	SDL_Joystick* joy = joystick_stickdata[joy_id];

	if(!PyArg_ParseTuple(args, ""))
		return NULL;

	JOYSTICK_INIT_CHECK();
	if(!joy)
		return RAISE(PyExc_SDLError, "Joystick not initialized");

	return PyInt_FromLong(SDL_JoystickNumButtons(joy));
}


static PyObject* joy_get_button(PyObject* self, PyObject* args)
{
	int joy_id = PyJoystick_AsID(self);
	SDL_Joystick* joy = joystick_stickdata[joy_id];
	int index, value;
	
	if(!PyArg_ParseTuple(args, "i", &index))
		return NULL;

	JOYSTICK_INIT_CHECK();
	if(!joy)
		return RAISE(PyExc_SDLError, "Joystick not initialized");
	if(index < 0 || index >= SDL_JoystickNumButtons(joy))
		return RAISE(PyExc_SDLError, "Invalid joystick button");

	value = SDL_JoystickGetButton(joy, index);
	return PyInt_FromLong(value);
}


static PyObject* joy_get_numballs(PyObject* self, PyObject* args)
{
	int joy_id = PyJoystick_AsID(self);
	SDL_Joystick* joy = joystick_stickdata[joy_id];

	if(!PyArg_ParseTuple(args, ""))
		return NULL;

	JOYSTICK_INIT_CHECK();
	if(!joy)
		return RAISE(PyExc_SDLError, "Joystick not initialized");

	return PyInt_FromLong(SDL_JoystickNumBalls(joy));
}


static PyObject* joy_get_ball(PyObject* self, PyObject* args)
{
	int joy_id = PyJoystick_AsID(self);
	SDL_Joystick* joy = joystick_stickdata[joy_id];
	int index, dx, dy;
	
	if(!PyArg_ParseTuple(args, "i", &index))
		return NULL;

	JOYSTICK_INIT_CHECK();
	if(!joy)
		return RAISE(PyExc_SDLError, "Joystick not initialized");
	if(index < 0 || index >= SDL_JoystickNumBalls(joy))
		return RAISE(PyExc_SDLError, "Invalid joystick trackball");

	SDL_JoystickGetBall(joy, index, &dx, &dy);
	return Py_BuildValue("(ii)", dx, dy);
}


static PyObject* joy_get_numhats(PyObject* self, PyObject* args)
{
	int joy_id = PyJoystick_AsID(self);
	SDL_Joystick* joy = joystick_stickdata[joy_id];

	if(!PyArg_ParseTuple(args, ""))
		return NULL;

	JOYSTICK_INIT_CHECK();
	if(!joy)
		return RAISE(PyExc_SDLError, "Joystick not initialized");

	return PyInt_FromLong(SDL_JoystickNumHats(joy));
}


static PyObject* joy_get_hat(PyObject* self, PyObject* args)
{
	int joy_id = PyJoystick_AsID(self);
	SDL_Joystick* joy = joystick_stickdata[joy_id];
	int index, px, py;
	Uint8 value;

	if(!PyArg_ParseTuple(args, "i", &index))
		return NULL;

	JOYSTICK_INIT_CHECK();
	if(!joy)
		return RAISE(PyExc_SDLError, "Joystick not initialized");
	if(index < 0 || index >= SDL_JoystickNumHats(joy))
		return RAISE(PyExc_SDLError, "Invalid joystick hat");

	px = py = 0;
	value = SDL_JoystickGetHat(joy, index);
	if(value&SDL_HAT_UP) py = 1;
	else if(value&SDL_HAT_DOWN) py = -1;
	if(value&SDL_HAT_RIGHT) px = 1;
	else if(value&SDL_HAT_LEFT) px = -1;
	
	return Py_BuildValue("(ii)", px, py);
}



static PyMethodDef joy_builtins[] =
{
	{ "init", joy_init, 1, DOC_JOYSTICKINIT },
	{ "quit", joy_quit, 1, DOC_JOYSTICKQUIT },
	{ "get_init", joy_get_init, 1, DOC_JOYSTICKGETINIT },

	{ "get_id", joy_get_id, 1, DOC_JOYSTICKGETID },
	{ "get_name", joy_get_name, 1, DOC_JOYSTICKGETNAME },

	{ "get_numaxes", joy_get_numaxes, 1, DOC_JOYSTICKGETNUMAXES },
	{ "get_axis", joy_get_axis, 1, DOC_JOYSTICKGETAXIS },
	{ "get_numbuttons", joy_get_numbuttons, 1, DOC_JOYSTICKGETNUMBUTTONS },
	{ "get_button", joy_get_button, 1, DOC_JOYSTICKGETBUTTON },
	{ "get_numballs", joy_get_numballs, 1, DOC_JOYSTICKGETNUMBALLS },
	{ "get_ball", joy_get_ball, 1, DOC_JOYSTICKGETBALL },
	{ "get_numhats", joy_get_numhats, 1, DOC_JOYSTICKGETNUMHATS },
	{ "get_hat", joy_get_hat, 1, DOC_JOYSTICKGETHAT },

	{ NULL, NULL }
};

static PyObject* joy_getattr(PyObject* self, char* attrname)
{
	return Py_FindMethod(joy_builtins, self, attrname);
}


static PyTypeObject PyJoystick_Type =
{
	PyObject_HEAD_INIT(NULL)
	0,
	"Joystick",
	sizeof(PyJoystickObject),
	0,
	joy_dealloc,
	0,
	joy_getattr,
	0,
	0,
	0,
	0,
	NULL,
	0, 
	(hashfunc)NULL,
	(ternaryfunc)NULL,
	(reprfunc)NULL,
	0L,0L,0L,0L,
	DOC_PYGAMEJOYSTICKJOYSTICK /* Documentation string */
};



static PyObject* PyJoystick_New(int id)
{
	PyJoystickObject* joy;

	if(id < 0 || id >= JOYSTICK_MAXSTICKS || id >= SDL_NumJoysticks())
		return RAISE(PyExc_SDLError, "Invalid joystick device number");
	
	joy = PyObject_NEW(PyJoystickObject, &PyJoystick_Type);
	if(!joy) return NULL;

	joy->id = id;

	return (PyObject*)joy;
}





static PyMethodDef joystick_builtins[] =
{
	{ "__PYGAMEinit__", joy_autoinit, 1, "auto initialize function for joystick" },
	{ "init", init, 1, DOC_PYGAMEJOYSTICKINIT },
	{ "quit", quit, 1, DOC_PYGAMEJOYSTICKQUIT },
	{ "get_init", get_init, 1, DOC_PYGAMEJOYSTICKGETINIT },
	{ "get_count", get_count, 1, DOC_PYGAMEJOYSTICKGETCOUNT },
	{ "Joystick", Joystick, 1, DOC_PYGAMEJOYSTICKJOYSTICK },
	{ NULL, NULL }
};


PYGAME_EXPORT
void initjoystick(void)
{
	PyObject *module, *dict, *apiobj;
	static void* c_api[PYGAMEAPI_JOYSTICK_NUMSLOTS];

	PyType_Init(PyJoystick_Type);


    /* create the module */
	module = Py_InitModule3("joystick", joystick_builtins, DOC_PYGAMEJOYSTICK);
	dict = PyModule_GetDict(module);

	PyDict_SetItemString(dict, "JoystickType", (PyObject *)&PyJoystick_Type);

	/* export the c api */
	c_api[0] = &PyJoystick_Type;
	c_api[1] = PyJoystick_New;
	apiobj = PyCObject_FromVoidPtr(c_api, NULL);
	PyDict_SetItemString(dict, PYGAMEAPI_LOCAL_ENTRY, apiobj);
	Py_DECREF(apiobj);

	/*imported needed apis*/
	import_pygame_base();
}