Initial. Don't... just don't ask.
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Ryan McGrath
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291
demos/mjoytest.c
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291
demos/mjoytest.c
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/* Program to test the svgalib joystick functions. */
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/* Written by M. Weller <eowmob@exp-math.uni-essen.de> */
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#include <stdlib.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <vga.h>
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#include <vgagl.h>
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#include <vgamouse.h>
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#include <vgajoystick.h>
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#include <vgakeyboard.h>
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extern char *optarg;
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extern int optind, opterr, optopt;
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#define PENCILSIZE 5
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struct {
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int wx; /* xoffset to add to scaled joystick position to get cx */
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int cx, cy; /* onscreen coords of pencil */
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int jx, jy; /* current joystick status */
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int tx; /* onscreen xcoord of text for joypos */
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char bitmap[PENCILSIZE * PENCILSIZE * 4]; /* big enough in any screen mode */
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int ox, oy; /* location of saved patch, ox < 0 for no data saved */
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int color; /* drawing color */
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int drawing; /* we are drawing (actually shadows button 1 state) */
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int newpos; /* cx/cy changed, draw new pencil position */
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} joypanel[2];
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int wy, sx, sy, ty; /* wy, ty y coords of wx, tx. sx/sy are scale values:
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* (jx * sx + 128) / 256 is pencil coords (add wx for screen
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* coords). Same for y. */
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int newcolor(void)
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{
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if (BYTESPERPIXEL == 1)
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return random() % 15 + 1;
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return gl_rgbcolor(random() & 255, random() & 255, random() & 255);
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}
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void draw_pencil(int i) {
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char msg[100];
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if (!joypanel[i].newpos)
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return;
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sprintf(msg, "x = %4d, y = %4d", joypanel[i].jx, joypanel[i].jy);
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gl_write(joypanel[i].tx, ty, msg);
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if (joypanel[i].ox >= 0)
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gl_putbox(joypanel[i].ox, joypanel[i].oy, PENCILSIZE, PENCILSIZE, joypanel[i].bitmap);
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/* If not drawing, save destination area */
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if (!joypanel[i].drawing)
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gl_getbox(joypanel[i].ox = joypanel[i].cx, joypanel[i].oy = joypanel[i].cy,
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PENCILSIZE, PENCILSIZE, joypanel[i].bitmap);
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else
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joypanel[i].ox = -1;
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gl_fillbox(joypanel[i].cx, joypanel[i].cy, PENCILSIZE, PENCILSIZE, joypanel[i].color);
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joypanel[i].newpos = 0;
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}
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void init_screen(void) {
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int white;
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gl_clearscreen(0);
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white = vga_white();
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gl_line(0, 0, WIDTH - 2, 0, white);
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gl_line(0, 0, 0, HEIGHT - 1, white);
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gl_line(WIDTH/2, 0, WIDTH/2, HEIGHT - 1, white);
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gl_line(WIDTH - 2, 0, WIDTH - 2 , HEIGHT - 1, white);
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gl_line(0, 11, WIDTH - 2, 11, white);
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gl_line(0, HEIGHT - 1, WIDTH - 2, HEIGHT - 1, white);
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ty = 2;
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sx = WIDTH / 2 - 3 - PENCILSIZE;
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sy = HEIGHT - 6 - PENCILSIZE - 9;
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wy = 2 + 8 + 3 + (((sy << 7) + 128) >> 8);
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joypanel[0].color = white;
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joypanel[0].drawing = 0;
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joypanel[0].newpos = 1;
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joypanel[0].ox = -1;
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joypanel[0].tx = 2;
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joypanel[0].jx = 0;
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joypanel[0].jy = 0;
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joypanel[0].wx = 2 + (((sx << 7) + 128) >> 8);
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joypanel[0].cx = joypanel[0].wx;
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joypanel[0].cy = wy;
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draw_pencil(0);
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joypanel[1].color = white;
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joypanel[1].drawing = 0;
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joypanel[1].newpos = 1;
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joypanel[1].ox = -1;
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joypanel[1].tx = WIDTH / 2 + 2;
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joypanel[1].jx = 0;
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joypanel[1].jy = 0;
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joypanel[1].wx = joypanel[0].wx + joypanel[1].tx;
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joypanel[1].cx = joypanel[0].cx + joypanel[1].tx;
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joypanel[1].cy = wy;
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draw_pencil(1);
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}
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void myhandler(int event, int number, char value, int joydev) {
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#if 0
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printf("%d: %d %d %d\n", joydev, event, number, (int)value);
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#endif
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switch(event) {
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case JOY_EVENTBUTTONUP:
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if (!number)
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joypanel[joydev].drawing = 0;
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else {
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joypanel[joydev].color = newcolor();
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joypanel[joydev].newpos = 1;
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}
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break;
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case JOY_EVENTBUTTONDOWN:
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if (!number)
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joypanel[joydev].drawing = 1;
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break;
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case JOY_EVENTAXIS:
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switch(number) {
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case 0: /* x */
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joypanel[joydev].jx = value;
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joypanel[joydev].cx = joypanel[joydev].wx + ((((int)value) * sx + 128) / 256);
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joypanel[joydev].newpos = 1;
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break;
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case 1:
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joypanel[joydev].jy = value;
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joypanel[joydev].cy = wy + ((((int)value) * sy + 128) / 256);
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joypanel[joydev].newpos = 1;
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break;
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}
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}
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/* Note that any reserved events are ignored */
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}
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void usage(void) {
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puts("Usage: mjoytest [-j <joystick number>] [svgalib mode]\n"
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"\ttest multiple joystick support and joystick sharing.");
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exit(1);
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}
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void mycalout(const char *msg) {
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gl_printf(-1, -1, msg);
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}
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int main(int argc, char *argv[]) {
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int vgamode = -1;
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int which, joymask = 3;
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struct timeval timeout;
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while(EOF != (which = getopt(argc, argv, "j:m:"))) {
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switch(which) {
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case 'j':
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if (!strcmp(optarg, "0"))
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joymask = 1;
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else if (!strcmp(optarg, "1"))
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joymask = 1;
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else
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usage();
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break;
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case 'm':
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vgamode = vga_getmodenumber(optarg);
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if (vgamode < 0)
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usage();
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break;
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default:
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usage();
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}
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}
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if (optind < argc) {
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if (optind != 1 + argc)
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usage();
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if (vgamode >= 0)
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usage();
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vgamode = vga_getmodenumber(argv[optind]);
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if (vgamode < 0)
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usage();
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}
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vga_init();
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if (vgamode < 0)
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vgamode = vga_getdefaultmode();
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if (vgamode < 0)
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vgamode = G320x200x256;
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if (!vga_hasmode(vgamode)) {
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printf("Mode not available.\n");
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exit(-1);
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}
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puts("In the demo, press\n"
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"<1> to calibrate joystick 1.\n"
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"<2> to calibrate joystick 2.\n"
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"<c> to clear the screen (<1> & <2> do this too).\n"
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"<q> to exit (<Ctrl>-C should work too.\n"
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"Joystick button 1 enables drawing while pressed.\n"
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"Joystick button 2 selects next color.\n"
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"\nNow hit <Return> to start the demo.");
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getchar();
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fflush(stdin);
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for (which = 0; which < 2; which++) {
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if (!(joymask & (1 << which)))
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continue;
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errno = 0;
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if (joystick_init(which, JOY_CALIB_STDOUT) < 0) {
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if (errno)
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printf("Unable to initialize joystick %d: %s.\n", which, strerror(errno));
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else
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printf("Unable to initialize joystick %d.\n", which);
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}
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}
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joystick_sethandler(-1, myhandler);
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vga_setmode(vgamode);
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gl_setcontextvga(vgamode);
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gl_setwritemode(FONT_COMPRESSED | WRITEMODE_OVERWRITE);
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gl_setfontcolors(0, vga_white());
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gl_setfont(8, 8, gl_font8x8);
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init_screen();
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for(;;) {
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timeout.tv_sec = 0;
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timeout.tv_usec = 10000;
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which = vga_waitevent(VGA_KEYEVENT, NULL, NULL, NULL, &timeout);
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if (which & VGA_KEYEVENT) {
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switch(vga_getch()) {
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case '1':
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gl_printf(2, 2, "");
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if (1 & joymask) {
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vga_lockvc();
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joystick_init(0, mycalout);
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/* IMPORTANT, reenable ownhandler! */
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joystick_sethandler(0, myhandler);
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vga_unlockvc();
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}
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init_screen();
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break;
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case '2':
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gl_printf(2, 2, "");
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if (2 & joymask) {
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vga_lockvc();
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joystick_init(1, mycalout);
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/* IMPORTANT, reenable ownhandler! */
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joystick_sethandler(1, myhandler);
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vga_unlockvc();
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}
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init_screen();
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break;
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case 'c':
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case 'C':
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init_screen();
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break;
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case 'q':
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case 'Q':
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goto leave_loop;
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default:
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putchar('\a');
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fflush(stdout);
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break;
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}
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}
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which = joystick_update();
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if (which & 1);
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draw_pencil(0); /* It makes only sense to check for the newpos flag
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* if something happened with the joystick at all */
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if (which & 2);
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draw_pencil(1);
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}
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leave_loop:
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printf("Shutting down.\n");
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vga_setmode(TEXT);
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exit(0);
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}
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