| /* |
| Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely. |
| */ |
| |
| /* Simple program to test the SDL joystick routines */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "SDL.h" |
| |
| #ifdef __EMSCRIPTEN__ |
| #include <emscripten/emscripten.h> |
| #endif |
| |
| #ifndef SDL_JOYSTICK_DISABLED |
| |
| #ifdef __IPHONEOS__ |
| #define SCREEN_WIDTH 320 |
| #define SCREEN_HEIGHT 480 |
| #else |
| #define SCREEN_WIDTH 640 |
| #define SCREEN_HEIGHT 480 |
| #endif |
| |
| SDL_Renderer *screen = NULL; |
| SDL_bool retval = SDL_FALSE; |
| SDL_bool done = SDL_FALSE; |
| |
| static void |
| DrawRect(SDL_Renderer *r, const int x, const int y, const int w, const int h) |
| { |
| const SDL_Rect area = { x, y, w, h }; |
| SDL_RenderFillRect(r, &area); |
| } |
| |
| void |
| loop(void *arg) |
| { |
| SDL_Event event; |
| int i; |
| SDL_Joystick *joystick = (SDL_Joystick *)arg; |
| |
| /* blank screen, set up for drawing this frame. */ |
| SDL_SetRenderDrawColor(screen, 0x0, 0x0, 0x0, SDL_ALPHA_OPAQUE); |
| SDL_RenderClear(screen); |
| |
| while (SDL_PollEvent(&event)) { |
| switch (event.type) { |
| |
| case SDL_JOYDEVICEREMOVED: |
| SDL_Log("Joystick device %d removed.\n", (int) event.jdevice.which); |
| SDL_Log("Our instance ID is %d\n", (int) SDL_JoystickInstanceID(joystick)); |
| break; |
| |
| case SDL_JOYAXISMOTION: |
| SDL_Log("Joystick %d axis %d value: %d\n", |
| event.jaxis.which, |
| event.jaxis.axis, event.jaxis.value); |
| break; |
| case SDL_JOYHATMOTION: |
| SDL_Log("Joystick %d hat %d value:", |
| event.jhat.which, event.jhat.hat); |
| if (event.jhat.value == SDL_HAT_CENTERED) |
| SDL_Log(" centered"); |
| if (event.jhat.value & SDL_HAT_UP) |
| SDL_Log(" up"); |
| if (event.jhat.value & SDL_HAT_RIGHT) |
| SDL_Log(" right"); |
| if (event.jhat.value & SDL_HAT_DOWN) |
| SDL_Log(" down"); |
| if (event.jhat.value & SDL_HAT_LEFT) |
| SDL_Log(" left"); |
| SDL_Log("\n"); |
| break; |
| case SDL_JOYBALLMOTION: |
| SDL_Log("Joystick %d ball %d delta: (%d,%d)\n", |
| event.jball.which, |
| event.jball.ball, event.jball.xrel, event.jball.yrel); |
| break; |
| case SDL_JOYBUTTONDOWN: |
| SDL_Log("Joystick %d button %d down\n", |
| event.jbutton.which, event.jbutton.button); |
| break; |
| case SDL_JOYBUTTONUP: |
| SDL_Log("Joystick %d button %d up\n", |
| event.jbutton.which, event.jbutton.button); |
| break; |
| case SDL_KEYDOWN: |
| if ((event.key.keysym.sym != SDLK_ESCAPE) && |
| (event.key.keysym.sym != SDLK_AC_BACK)) { |
| break; |
| } |
| /* Fall through to signal quit */ |
| case SDL_FINGERDOWN: |
| case SDL_MOUSEBUTTONDOWN: |
| case SDL_QUIT: |
| done = SDL_TRUE; |
| break; |
| default: |
| break; |
| } |
| } |
| /* Update visual joystick state */ |
| SDL_SetRenderDrawColor(screen, 0x00, 0xFF, 0x00, SDL_ALPHA_OPAQUE); |
| for (i = 0; i < SDL_JoystickNumButtons(joystick); ++i) { |
| if (SDL_JoystickGetButton(joystick, i) == SDL_PRESSED) { |
| DrawRect(screen, (i%20) * 34, SCREEN_HEIGHT - 68 + (i/20) * 34, 32, 32); |
| } |
| } |
| |
| SDL_SetRenderDrawColor(screen, 0xFF, 0x00, 0x00, SDL_ALPHA_OPAQUE); |
| for (i = 0; i < SDL_JoystickNumAxes(joystick); ++i) { |
| /* Draw the X/Y axis */ |
| int x, y; |
| x = (((int) SDL_JoystickGetAxis(joystick, i)) + 32768); |
| x *= SCREEN_WIDTH; |
| x /= 65535; |
| if (x < 0) { |
| x = 0; |
| } else if (x > (SCREEN_WIDTH - 16)) { |
| x = SCREEN_WIDTH - 16; |
| } |
| ++i; |
| if (i < SDL_JoystickNumAxes(joystick)) { |
| y = (((int) SDL_JoystickGetAxis(joystick, i)) + 32768); |
| } else { |
| y = 32768; |
| } |
| y *= SCREEN_HEIGHT; |
| y /= 65535; |
| if (y < 0) { |
| y = 0; |
| } else if (y > (SCREEN_HEIGHT - 16)) { |
| y = SCREEN_HEIGHT - 16; |
| } |
| |
| DrawRect(screen, x, y, 16, 16); |
| } |
| |
| SDL_SetRenderDrawColor(screen, 0x00, 0x00, 0xFF, SDL_ALPHA_OPAQUE); |
| for (i = 0; i < SDL_JoystickNumHats(joystick); ++i) { |
| /* Derive the new position */ |
| int x = SCREEN_WIDTH/2; |
| int y = SCREEN_HEIGHT/2; |
| const Uint8 hat_pos = SDL_JoystickGetHat(joystick, i); |
| |
| if (hat_pos & SDL_HAT_UP) { |
| y = 0; |
| } else if (hat_pos & SDL_HAT_DOWN) { |
| y = SCREEN_HEIGHT-8; |
| } |
| |
| if (hat_pos & SDL_HAT_LEFT) { |
| x = 0; |
| } else if (hat_pos & SDL_HAT_RIGHT) { |
| x = SCREEN_WIDTH-8; |
| } |
| |
| DrawRect(screen, x, y, 8, 8); |
| } |
| |
| SDL_RenderPresent(screen); |
| |
| if (SDL_JoystickGetAttached( joystick ) == 0) { |
| done = SDL_TRUE; |
| retval = SDL_TRUE; /* keep going, wait for reattach. */ |
| } |
| |
| #ifdef __EMSCRIPTEN__ |
| if (done) { |
| emscripten_cancel_main_loop(); |
| } |
| #endif |
| } |
| |
| static SDL_bool |
| WatchJoystick(SDL_Joystick * joystick) |
| { |
| SDL_Window *window = NULL; |
| const char *name = NULL; |
| |
| retval = SDL_FALSE; |
| done = SDL_FALSE; |
| |
| /* Create a window to display joystick axis position */ |
| window = SDL_CreateWindow("Joystick Test", SDL_WINDOWPOS_CENTERED, |
| SDL_WINDOWPOS_CENTERED, SCREEN_WIDTH, |
| SCREEN_HEIGHT, 0); |
| if (window == NULL) { |
| SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create window: %s\n", SDL_GetError()); |
| return SDL_FALSE; |
| } |
| |
| screen = SDL_CreateRenderer(window, -1, 0); |
| if (screen == NULL) { |
| SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create renderer: %s\n", SDL_GetError()); |
| SDL_DestroyWindow(window); |
| return SDL_FALSE; |
| } |
| |
| SDL_SetRenderDrawColor(screen, 0x00, 0x00, 0x00, SDL_ALPHA_OPAQUE); |
| SDL_RenderClear(screen); |
| SDL_RenderPresent(screen); |
| SDL_RaiseWindow(window); |
| |
| /* Print info about the joystick we are watching */ |
| name = SDL_JoystickName(joystick); |
| SDL_Log("Watching joystick %d: (%s)\n", SDL_JoystickInstanceID(joystick), |
| name ? name : "Unknown Joystick"); |
| SDL_Log("Joystick has %d axes, %d hats, %d balls, and %d buttons\n", |
| SDL_JoystickNumAxes(joystick), SDL_JoystickNumHats(joystick), |
| SDL_JoystickNumBalls(joystick), SDL_JoystickNumButtons(joystick)); |
| |
| /* Loop, getting joystick events! */ |
| #ifdef __EMSCRIPTEN__ |
| emscripten_set_main_loop_arg(loop, joystick, 0, 1); |
| #else |
| while (!done) { |
| loop(joystick); |
| } |
| #endif |
| |
| SDL_DestroyRenderer(screen); |
| screen = NULL; |
| SDL_DestroyWindow(window); |
| return retval; |
| } |
| |
| int |
| main(int argc, char *argv[]) |
| { |
| const char *name; |
| int i; |
| SDL_Joystick *joystick; |
| |
| SDL_SetHint(SDL_HINT_ACCELEROMETER_AS_JOYSTICK, "0"); |
| |
| /* Enable standard application logging */ |
| SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO); |
| |
| /* Initialize SDL (Note: video is required to start event loop) */ |
| if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK) < 0) { |
| SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError()); |
| exit(1); |
| } |
| |
| /* Print information about the joysticks */ |
| SDL_Log("There are %d joysticks attached\n", SDL_NumJoysticks()); |
| for (i = 0; i < SDL_NumJoysticks(); ++i) { |
| name = SDL_JoystickNameForIndex(i); |
| SDL_Log("Joystick %d: %s\n", i, name ? name : "Unknown Joystick"); |
| joystick = SDL_JoystickOpen(i); |
| if (joystick == NULL) { |
| SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_JoystickOpen(%d) failed: %s\n", i, |
| SDL_GetError()); |
| } else { |
| char guid[64]; |
| SDL_assert(SDL_JoystickFromInstanceID(SDL_JoystickInstanceID(joystick)) == joystick); |
| SDL_JoystickGetGUIDString(SDL_JoystickGetGUID(joystick), |
| guid, sizeof (guid)); |
| SDL_Log(" axes: %d\n", SDL_JoystickNumAxes(joystick)); |
| SDL_Log(" balls: %d\n", SDL_JoystickNumBalls(joystick)); |
| SDL_Log(" hats: %d\n", SDL_JoystickNumHats(joystick)); |
| SDL_Log(" buttons: %d\n", SDL_JoystickNumButtons(joystick)); |
| SDL_Log("instance id: %d\n", SDL_JoystickInstanceID(joystick)); |
| SDL_Log(" guid: %s\n", guid); |
| SDL_JoystickClose(joystick); |
| } |
| } |
| |
| #if defined(__ANDROID__) || defined(__IPHONEOS__) |
| if (SDL_NumJoysticks() > 0) { |
| #else |
| if (argv[1]) { |
| #endif |
| SDL_bool reportederror = SDL_FALSE; |
| SDL_bool keepGoing = SDL_TRUE; |
| SDL_Event event; |
| int device; |
| #if defined(__ANDROID__) || defined(__IPHONEOS__) |
| device = 0; |
| #else |
| device = atoi(argv[1]); |
| #endif |
| joystick = SDL_JoystickOpen(device); |
| if (joystick != NULL) { |
| SDL_assert(SDL_JoystickFromInstanceID(SDL_JoystickInstanceID(joystick)) == joystick); |
| } |
| |
| while ( keepGoing ) { |
| if (joystick == NULL) { |
| if ( !reportederror ) { |
| SDL_Log("Couldn't open joystick %d: %s\n", device, SDL_GetError()); |
| keepGoing = SDL_FALSE; |
| reportederror = SDL_TRUE; |
| } |
| } else { |
| reportederror = SDL_FALSE; |
| keepGoing = WatchJoystick(joystick); |
| SDL_JoystickClose(joystick); |
| } |
| |
| joystick = NULL; |
| if (keepGoing) { |
| SDL_Log("Waiting for attach\n"); |
| } |
| while (keepGoing) { |
| SDL_WaitEvent(&event); |
| if ((event.type == SDL_QUIT) || (event.type == SDL_FINGERDOWN) |
| || (event.type == SDL_MOUSEBUTTONDOWN)) { |
| keepGoing = SDL_FALSE; |
| } else if (event.type == SDL_JOYDEVICEADDED) { |
| 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"); |
| exit(1); |
| } |
| |
| #endif |
