344 lines
10 KiB
C
344 lines
10 KiB
C
/*
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Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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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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#ifdef __EMSCRIPTEN__
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#include <emscripten/emscripten.h>
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#endif
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#ifndef SDL_JOYSTICK_DISABLED
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#ifdef __IPHONEOS__
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#define SCREEN_WIDTH 320
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#define SCREEN_HEIGHT 480
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#else
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#define SCREEN_WIDTH 640
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#define SCREEN_HEIGHT 480
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#endif
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static SDL_Window *window = NULL;
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static SDL_Renderer *screen = NULL;
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static SDL_Joystick *joystick = NULL;
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static SDL_bool done = SDL_FALSE;
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static void
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PrintJoystick(SDL_Joystick *joy)
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{
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const char *type;
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char guid[64];
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SDL_assert(SDL_JoystickFromInstanceID(SDL_JoystickInstanceID(joy)) == joy);
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SDL_JoystickGetGUIDString(SDL_JoystickGetGUID(joy), guid, sizeof(guid));
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switch (SDL_JoystickGetType(joy)) {
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case SDL_JOYSTICK_TYPE_GAMECONTROLLER:
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type = "Game Controller";
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break;
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case SDL_JOYSTICK_TYPE_WHEEL:
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type = "Wheel";
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break;
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case SDL_JOYSTICK_TYPE_ARCADE_STICK:
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type = "Arcade Stick";
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break;
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case SDL_JOYSTICK_TYPE_FLIGHT_STICK:
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type = "Flight Stick";
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break;
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case SDL_JOYSTICK_TYPE_DANCE_PAD:
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type = "Dance Pad";
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break;
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case SDL_JOYSTICK_TYPE_GUITAR:
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type = "Guitar";
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break;
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case SDL_JOYSTICK_TYPE_DRUM_KIT:
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type = "Drum Kit";
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break;
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case SDL_JOYSTICK_TYPE_ARCADE_PAD:
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type = "Arcade Pad";
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break;
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case SDL_JOYSTICK_TYPE_THROTTLE:
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type = "Throttle";
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break;
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default:
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type = "Unknown";
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break;
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}
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SDL_Log("Joystick\n");
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SDL_Log(" name: %s\n", SDL_JoystickName(joy));
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SDL_Log(" type: %s\n", type);
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SDL_Log(" LED: %s\n", SDL_JoystickHasLED(joy) ? "yes" : "no");
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SDL_Log(" rumble: %s\n", SDL_JoystickHasRumble(joy) ? "yes" : "no");
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SDL_Log("trigger rumble: %s\n", SDL_JoystickHasRumbleTriggers(joy) ? "yes" : "no");
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SDL_Log(" axes: %d\n", SDL_JoystickNumAxes(joy));
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SDL_Log(" balls: %d\n", SDL_JoystickNumBalls(joy));
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SDL_Log(" hats: %d\n", SDL_JoystickNumHats(joy));
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SDL_Log(" buttons: %d\n", SDL_JoystickNumButtons(joy));
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SDL_Log(" instance id: %" SDL_PRIs32 "\n", SDL_JoystickInstanceID(joy));
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SDL_Log(" guid: %s\n", guid);
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SDL_Log(" VID/PID: 0x%.4x/0x%.4x\n", SDL_JoystickGetVendor(joy), SDL_JoystickGetProduct(joy));
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}
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static void
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DrawRect(SDL_Renderer *r, const int x, const int y, const int w, const int h)
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{
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SDL_Rect area;
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area.x = x;
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area.y = y;
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area.w = w;
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area.h = h;
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SDL_RenderFillRect(r, &area);
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}
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void loop(void *arg)
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{
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SDL_Event event;
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int i;
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/* blank screen, set up for drawing this frame. */
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SDL_SetRenderDrawColor(screen, 0x0, 0x0, 0x0, SDL_ALPHA_OPAQUE);
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SDL_RenderClear(screen);
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while (SDL_PollEvent(&event)) {
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switch (event.type) {
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case SDL_JOYDEVICEADDED:
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SDL_Log("Joystick device %d added.\n", (int)event.jdevice.which);
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if (!joystick) {
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joystick = SDL_JoystickOpen(event.jdevice.which);
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if (joystick) {
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PrintJoystick(joystick);
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} else {
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SDL_Log("Couldn't open joystick: %s\n", SDL_GetError());
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}
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}
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break;
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case SDL_JOYDEVICEREMOVED:
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SDL_Log("Joystick device %d removed.\n", (int)event.jdevice.which);
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if (event.jdevice.which == SDL_JoystickInstanceID(joystick)) {
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SDL_JoystickClose(joystick);
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joystick = SDL_JoystickOpen(0);
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}
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break;
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case SDL_JOYAXISMOTION:
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SDL_Log("Joystick %" SDL_PRIs32 " axis %d value: %d\n",
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event.jaxis.which,
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event.jaxis.axis, event.jaxis.value);
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break;
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case SDL_JOYHATMOTION:
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SDL_Log("Joystick %" SDL_PRIs32 " hat %d value:",
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event.jhat.which, event.jhat.hat);
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if (event.jhat.value == SDL_HAT_CENTERED) {
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SDL_Log(" centered");
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}
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if (event.jhat.value & SDL_HAT_UP) {
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SDL_Log(" up");
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}
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if (event.jhat.value & SDL_HAT_RIGHT) {
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SDL_Log(" right");
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}
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if (event.jhat.value & SDL_HAT_DOWN) {
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SDL_Log(" down");
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}
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if (event.jhat.value & SDL_HAT_LEFT) {
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SDL_Log(" left");
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}
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SDL_Log("\n");
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break;
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case SDL_JOYBALLMOTION:
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SDL_Log("Joystick %" SDL_PRIs32 " ball %d delta: (%d,%d)\n",
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event.jball.which,
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event.jball.ball, event.jball.xrel, event.jball.yrel);
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break;
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case SDL_JOYBUTTONDOWN:
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SDL_Log("Joystick %" SDL_PRIs32 " button %d down\n",
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event.jbutton.which, event.jbutton.button);
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/* First button triggers a 0.5 second full strength rumble */
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if (event.jbutton.button == 0) {
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SDL_JoystickRumble(joystick, 0xFFFF, 0xFFFF, 500);
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}
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break;
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case SDL_JOYBUTTONUP:
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SDL_Log("Joystick %" SDL_PRIs32 " button %d up\n",
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event.jbutton.which, event.jbutton.button);
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break;
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case SDL_KEYDOWN:
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/* Press the L key to lag for 3 seconds, to see what happens
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when SDL doesn't service the event loop quickly. */
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if (event.key.keysym.sym == SDLK_l) {
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SDL_Log("Lagging for 3 seconds...\n");
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SDL_Delay(3000);
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break;
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}
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if ((event.key.keysym.sym != SDLK_ESCAPE) &&
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(event.key.keysym.sym != SDLK_AC_BACK)) {
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break;
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}
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SDL_FALLTHROUGH;
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case SDL_FINGERDOWN:
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case SDL_MOUSEBUTTONDOWN:
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case SDL_QUIT:
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done = SDL_TRUE;
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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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if (joystick) {
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const int BUTTONS_PER_LINE = ((SCREEN_WIDTH - 4) / 34);
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int x, y;
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/* Update visual joystick state */
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SDL_SetRenderDrawColor(screen, 0x00, 0xFF, 0x00, SDL_ALPHA_OPAQUE);
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y = SCREEN_HEIGHT - ((((SDL_JoystickNumButtons(joystick) + (BUTTONS_PER_LINE - 1)) / BUTTONS_PER_LINE) + 1) * 34);
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for (i = 0; i < SDL_JoystickNumButtons(joystick); ++i) {
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if ((i % BUTTONS_PER_LINE) == 0) {
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y += 34;
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}
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if (SDL_JoystickGetButton(joystick, i) == SDL_PRESSED) {
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x = 2 + (i % BUTTONS_PER_LINE) * 34;
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DrawRect(screen, x, y, 32, 32);
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}
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}
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SDL_SetRenderDrawColor(screen, 0xFF, 0x00, 0x00, SDL_ALPHA_OPAQUE);
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for (i = 0; i < SDL_JoystickNumAxes(joystick); ++i) {
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/* Draw the X/Y axis */
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x = (((int)SDL_JoystickGetAxis(joystick, i)) + 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 if (x > (SCREEN_WIDTH - 16)) {
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x = SCREEN_WIDTH - 16;
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}
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++i;
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if (i < SDL_JoystickNumAxes(joystick)) {
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y = (((int)SDL_JoystickGetAxis(joystick, i)) + 32768);
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} else {
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y = 32768;
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}
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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 if (y > (SCREEN_HEIGHT - 16)) {
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y = SCREEN_HEIGHT - 16;
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}
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DrawRect(screen, x, y, 16, 16);
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}
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SDL_SetRenderDrawColor(screen, 0x00, 0x00, 0xFF, SDL_ALPHA_OPAQUE);
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for (i = 0; i < SDL_JoystickNumHats(joystick); ++i) {
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/* Derive the new position */
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const Uint8 hat_pos = SDL_JoystickGetHat(joystick, i);
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x = SCREEN_WIDTH / 2;
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y = SCREEN_HEIGHT / 2;
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if (hat_pos & SDL_HAT_UP) {
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y = 0;
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} else if (hat_pos & SDL_HAT_DOWN) {
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y = SCREEN_HEIGHT - 8;
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}
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if (hat_pos & SDL_HAT_LEFT) {
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x = 0;
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} else if (hat_pos & SDL_HAT_RIGHT) {
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x = SCREEN_WIDTH - 8;
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}
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DrawRect(screen, x, y, 8, 8);
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}
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}
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SDL_Delay(16);
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SDL_RenderPresent(screen);
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#ifdef __EMSCRIPTEN__
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if (done) {
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emscripten_cancel_main_loop();
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}
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#endif
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}
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int main(int argc, char *argv[])
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{
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SDL_SetHint(SDL_HINT_ACCELEROMETER_AS_JOYSTICK, "0");
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/* Enable standard application logging */
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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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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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
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exit(1);
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}
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/* Create a window to display joystick axis position */
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window = SDL_CreateWindow("Joystick Test", SDL_WINDOWPOS_CENTERED,
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SDL_WINDOWPOS_CENTERED, SCREEN_WIDTH,
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SCREEN_HEIGHT, 0);
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if (!window) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create window: %s\n", SDL_GetError());
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return SDL_FALSE;
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}
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screen = SDL_CreateRenderer(window, -1, 0);
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if (!screen) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create renderer: %s\n", SDL_GetError());
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SDL_DestroyWindow(window);
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return SDL_FALSE;
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}
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SDL_SetRenderDrawColor(screen, 0x00, 0x00, 0x00, SDL_ALPHA_OPAQUE);
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SDL_RenderClear(screen);
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SDL_RenderPresent(screen);
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/* Loop, getting joystick events! */
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#ifdef __EMSCRIPTEN__
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emscripten_set_main_loop_arg(loop, NULL, 0, 1);
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#else
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while (!done) {
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loop(NULL);
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}
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#endif
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SDL_DestroyRenderer(screen);
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SDL_DestroyWindow(window);
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SDL_QuitSubSystem(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK);
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return 0;
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}
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#else
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int
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main(int argc, char *argv[])
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{
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL compiled without Joystick support.\n");
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return 1;
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}
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#endif
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/* vi: set ts=4 sw=4 expandtab: */
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