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388 lines
13 KiB
388 lines
13 KiB
4 years ago
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/*
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Copyright (C) 1997-2020 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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SDL_Renderer *screen = NULL;
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SDL_bool retval = SDL_FALSE;
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SDL_bool done = SDL_FALSE;
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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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const SDL_Rect area = { x, y, w, h };
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SDL_RenderFillRect(r, &area);
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}
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void
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loop(void *arg)
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{
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SDL_Event event;
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int i;
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SDL_Joystick *joystick = (SDL_Joystick *)arg;
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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_JOYDEVICEREMOVED:
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SDL_Log("Joystick device %d removed.\n", (int) event.jdevice.which);
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SDL_Log("Our instance ID is %d\n", (int) SDL_JoystickInstanceID(joystick));
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break;
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case SDL_JOYAXISMOTION:
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SDL_Log("Joystick %d 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 %d 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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if (event.jhat.value & SDL_HAT_UP)
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SDL_Log(" up");
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if (event.jhat.value & SDL_HAT_RIGHT)
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SDL_Log(" right");
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if (event.jhat.value & SDL_HAT_DOWN)
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SDL_Log(" down");
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if (event.jhat.value & SDL_HAT_LEFT)
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SDL_Log(" left");
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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 %d 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 %d 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 %d 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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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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/* Fall through to signal quit */
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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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/* Update visual joystick state */
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SDL_SetRenderDrawColor(screen, 0x00, 0xFF, 0x00, SDL_ALPHA_OPAQUE);
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for (i = 0; i < SDL_JoystickNumButtons(joystick); ++i) {
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if (SDL_JoystickGetButton(joystick, i) == SDL_PRESSED) {
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DrawRect(screen, (i%20) * 34, SCREEN_HEIGHT - 68 + (i/20) * 34, 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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int x, y;
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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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int x = SCREEN_WIDTH/2;
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int y = SCREEN_HEIGHT/2;
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const Uint8 hat_pos = SDL_JoystickGetHat(joystick, i);
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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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SDL_RenderPresent(screen);
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if (SDL_JoystickGetAttached( joystick ) == 0) {
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done = SDL_TRUE;
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retval = SDL_TRUE; /* keep going, wait for reattach. */
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}
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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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static SDL_bool
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WatchJoystick(SDL_Joystick * joystick)
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{
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SDL_Window *window = NULL;
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const char *name = NULL;
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retval = SDL_FALSE;
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done = SDL_FALSE;
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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 == NULL) {
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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 == NULL) {
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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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SDL_RaiseWindow(window);
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/* Print info about the joystick we are watching */
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name = SDL_JoystickName(joystick);
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SDL_Log("Watching joystick %d: (%s)\n", SDL_JoystickInstanceID(joystick),
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name ? name : "Unknown Joystick");
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SDL_Log("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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/* Loop, getting joystick events! */
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#ifdef __EMSCRIPTEN__
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emscripten_set_main_loop_arg(loop, joystick, 0, 1);
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#else
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while (!done) {
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loop(joystick);
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}
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#endif
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SDL_DestroyRenderer(screen);
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screen = NULL;
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SDL_DestroyWindow(window);
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return retval;
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}
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int
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main(int argc, char *argv[])
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{
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const char *name, *type;
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int i;
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SDL_Joystick *joystick;
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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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/* Print information about the joysticks */
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SDL_Log("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_JoystickNameForIndex(i);
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SDL_Log("Joystick %d: %s\n", i, name ? name : "Unknown Joystick");
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joystick = SDL_JoystickOpen(i);
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if (joystick == NULL) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_JoystickOpen(%d) failed: %s\n", i,
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SDL_GetError());
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} else {
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char guid[64];
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SDL_assert(SDL_JoystickFromInstanceID(SDL_JoystickInstanceID(joystick)) == joystick);
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SDL_JoystickGetGUIDString(SDL_JoystickGetGUID(joystick),
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guid, sizeof (guid));
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switch (SDL_JoystickGetType(joystick)) {
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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(" type: %s\n", type);
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SDL_Log(" axes: %d\n", SDL_JoystickNumAxes(joystick));
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SDL_Log(" balls: %d\n", SDL_JoystickNumBalls(joystick));
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SDL_Log(" hats: %d\n", SDL_JoystickNumHats(joystick));
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SDL_Log(" buttons: %d\n", SDL_JoystickNumButtons(joystick));
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SDL_Log("instance id: %d\n", SDL_JoystickInstanceID(joystick));
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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(joystick), SDL_JoystickGetProduct(joystick));
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SDL_JoystickClose(joystick);
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}
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}
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#if defined(__ANDROID__) || defined(__IPHONEOS__)
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if (SDL_NumJoysticks() > 0) {
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#else
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if (argv[1]) {
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#endif
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SDL_bool reportederror = SDL_FALSE;
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SDL_bool keepGoing = SDL_TRUE;
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SDL_Event event;
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int device;
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#if defined(__ANDROID__) || defined(__IPHONEOS__)
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device = 0;
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#else
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device = atoi(argv[1]);
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#endif
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joystick = SDL_JoystickOpen(device);
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if (joystick != NULL) {
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SDL_assert(SDL_JoystickFromInstanceID(SDL_JoystickInstanceID(joystick)) == joystick);
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}
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while ( keepGoing ) {
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if (joystick == NULL) {
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if ( !reportederror ) {
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SDL_Log("Couldn't open joystick %d: %s\n", device, SDL_GetError());
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keepGoing = SDL_FALSE;
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reportederror = SDL_TRUE;
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}
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} else {
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reportederror = SDL_FALSE;
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keepGoing = WatchJoystick(joystick);
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SDL_JoystickClose(joystick);
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}
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joystick = NULL;
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if (keepGoing) {
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SDL_Log("Waiting for attach\n");
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}
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while (keepGoing) {
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SDL_WaitEvent(&event);
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if ((event.type == SDL_QUIT) || (event.type == SDL_FINGERDOWN)
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|| (event.type == SDL_MOUSEBUTTONDOWN)) {
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keepGoing = SDL_FALSE;
|
||
|
|
} else if (event.type == SDL_JOYDEVICEADDED) {
|
||
|
|
device = event.jdevice.which;
|
||
|
|
joystick = SDL_JoystickOpen(device);
|
||
|
|
if (joystick != NULL) {
|
||
|
|
SDL_assert(SDL_JoystickFromInstanceID(SDL_JoystickInstanceID(joystick)) == joystick);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
SDL_QuitSubSystem(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
int
|
||
|
|
main(int argc, char *argv[])
|
||
|
|
{
|
||
|
|
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL compiled without Joystick support.\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* vi: set ts=4 sw=4 expandtab: */
|