test/testjoystick.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 21 May 2006 16:47:41 +0000
changeset 1854 2280e314a978
parent 0 74212992fb08
child 1662 782fd950bd46
child 1855 5ff2c01e475e
permissions -rw-r--r--
Closed bug #74 Added DirectInput joystick code, contributed by Glenn Maynard. This fixes a problem with the Windows Multimedia joystick driver not showing all 6 axes on a GameCube controller converter, which was donated by Jacob Kolding.
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/* Simple program to test the SDL joystick routines */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "SDL.h"
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#define SCREEN_WIDTH	640
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#define SCREEN_HEIGHT	480
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void WatchJoystick(SDL_Joystick *joystick)
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{
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	SDL_Surface *screen;
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	const char *name;
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	int i, done;
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	SDL_Event event;
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	int x, y, draw;
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	SDL_Rect axis_area[6][2];
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	/* Set a video mode to display joystick axis position */
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	screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, 16, 0);
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	if ( screen == NULL ) {
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		fprintf(stderr, "Couldn't set video mode: %s\n",SDL_GetError());
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		return;
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	}
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	/* Print info about the joystick we are watching */
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	name = SDL_JoystickName(SDL_JoystickIndex(joystick));
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	printf("Watching joystick %d: (%s)\n", SDL_JoystickIndex(joystick),
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	       name ? name : "Unknown Joystick");
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	printf("Joystick has %d axes, %d hats, %d balls, and %d buttons\n",
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	       SDL_JoystickNumAxes(joystick), SDL_JoystickNumHats(joystick),
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	       SDL_JoystickNumBalls(joystick),SDL_JoystickNumButtons(joystick));
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	/* Initialize drawing rectangles */
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	memset(axis_area, 0, (sizeof axis_area));
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	draw = 0;
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	/* Loop, getting joystick events! */
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	done = 0;
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	while ( ! done ) {
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		while ( SDL_PollEvent(&event) ) {
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			switch (event.type) {
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			    case SDL_JOYAXISMOTION:
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				printf("Joystick %d axis %d value: %d\n",
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				       event.jaxis.which,
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				       event.jaxis.axis,
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				       event.jaxis.value);
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				break;
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			    case SDL_JOYHATMOTION:
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				printf("Joystick %d hat %d value:",
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				       event.jhat.which,
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				       event.jhat.hat);
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				if ( event.jhat.value == SDL_HAT_CENTERED )
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					printf(" centered");
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				if ( event.jhat.value & SDL_HAT_UP )
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					printf(" up");
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				if ( event.jhat.value & SDL_HAT_RIGHT )
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					printf(" right");
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				if ( event.jhat.value & SDL_HAT_DOWN )
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					printf(" down");
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				if ( event.jhat.value & SDL_HAT_LEFT )
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					printf(" left");
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				printf("\n");
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				break;
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			    case SDL_JOYBALLMOTION:
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				printf("Joystick %d ball %d delta: (%d,%d)\n",
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				       event.jball.which,
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				       event.jball.ball,
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				       event.jball.xrel,
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				       event.jball.yrel);
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				break;
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			    case SDL_JOYBUTTONDOWN:
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				printf("Joystick %d button %d down\n",
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				       event.jbutton.which,
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				       event.jbutton.button);
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				break;
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			    case SDL_JOYBUTTONUP:
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				printf("Joystick %d button %d up\n",
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				       event.jbutton.which,
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				       event.jbutton.button);
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				break;
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			    case SDL_KEYDOWN:
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				if ( event.key.keysym.sym != SDLK_ESCAPE ) {
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					break;
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				}
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				/* Fall through to signal quit */
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			    case SDL_QUIT:
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				done = 1;
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				break;
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			    default:
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				break;
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			}
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		}
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		/* Update visual joystick state */
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		for ( i=0; i<SDL_JoystickNumButtons(joystick); ++i ) {
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			SDL_Rect area;
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			area.x = i*34;
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			area.y = SCREEN_HEIGHT-34;
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			area.w = 32;
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			area.h = 32;
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			if (SDL_JoystickGetButton(joystick, i) == SDL_PRESSED) {
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				SDL_FillRect(screen, &area, 0xFFFF);
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			} else {
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				SDL_FillRect(screen, &area, 0x0000);
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			}
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			SDL_UpdateRects(screen, 1, &area);
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		}
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		for ( i=0; i<SDL_JoystickNumAxes(joystick)/2 && i < SDL_arraysize(axis_area); ++i ) {
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			/* Erase previous axes */
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			SDL_FillRect(screen, &axis_area[i][draw], 0x0000);
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			/* Draw the X/Y axis */
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			draw = !draw;
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			x = (((int)SDL_JoystickGetAxis(joystick, i*2+0))+32768);
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			x *= SCREEN_WIDTH;
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			x /= 65535;
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			if ( x < 0 ) {
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				x = 0;
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			} else
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			if ( x > (SCREEN_WIDTH-16) ) {
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				x = SCREEN_WIDTH-16;
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			}
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			y = (((int)SDL_JoystickGetAxis(joystick, i*2+1))+32768);
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			y *= SCREEN_HEIGHT;
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			y /= 65535;
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			if ( y < 0 ) {
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				y = 0;
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			} else
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			if ( y > (SCREEN_HEIGHT-16) ) {
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				y = SCREEN_HEIGHT-16;
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			}
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			axis_area[i][draw].x = (Sint16)x;
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			axis_area[i][draw].y = (Sint16)y;
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			axis_area[i][draw].w = 16;
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			axis_area[i][draw].h = 16;
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			SDL_FillRect(screen, &axis_area[i][draw], 0xFFFF);
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			SDL_UpdateRects(screen, 2, axis_area[i]);
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		}
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	}
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}
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int main(int argc, char *argv[])
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{
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	const char *name;
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	int i;
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	SDL_Joystick *joystick;
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	/* Initialize SDL (Note: video is required to start event loop) */
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	if ( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK) < 0 ) {
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		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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		exit(1);
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	}
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	/* Print information about the joysticks */
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	printf("There are %d joysticks attached\n", SDL_NumJoysticks());
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	for ( i=0; i<SDL_NumJoysticks(); ++i ) {
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		name = SDL_JoystickName(i);
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		printf("Joystick %d: %s\n",i,name ? name : "Unknown Joystick");
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	}
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	if ( argv[1] ) {
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		joystick = SDL_JoystickOpen(atoi(argv[1]));
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		if ( joystick == NULL ) {
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			printf("Couldn't open joystick %d: %s\n", atoi(argv[1]),
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			       SDL_GetError());
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		} else {
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			WatchJoystick(joystick);
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			SDL_JoystickClose(joystick);
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		}
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	}
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	SDL_QuitSubSystem(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK);
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	return(0);
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}