kc3-lang/SDL/test/testgamecontroller.c

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• Hash : fe40a172
  Author :
  Date : 2014-12-18T00:19:52
  

  Initial merge of Emscripten port! With this commit, you can compile SDL2 with Emscripten ( http://emscripten.org/ ), and make your SDL-based C/C++ program into a web app. This port was due to the efforts of several people, including: Charlie Birks, Sathyanarayanan Gunasekaran, Jukka Jyl?nki, Alon Zakai, Edward Rudd, Bruce Mitchener, and Martin Gerhardy. (Thanks, everyone!)

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• test/testgamecontroller.c

• /*
    Copyright (C) 1997-2014 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 game controller 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    512
  #define SCREEN_HEIGHT   317
  #endif
  
  /* This is indexed by SDL_GameControllerButton. */
  static const struct { int x; int y; } button_positions[] = {
      {387, 167},  /* A */
      {431, 132},  /* B */
      {342, 132},  /* X */
      {389, 101},  /* Y */
      {174, 132},  /* BACK */
      {233, 132},  /* GUIDE */
      {289, 132},  /* START */
      {75,  154},  /* LEFTSTICK */
      {305, 230},  /* RIGHTSTICK */
      {77,  40},   /* LEFTSHOULDER */
      {396, 36},   /* RIGHTSHOULDER */
      {154, 188},  /* DPAD_UP */
      {154, 249},  /* DPAD_DOWN */
      {116, 217},  /* DPAD_LEFT */
      {186, 217},  /* DPAD_RIGHT */
  };
  
  /* This is indexed by SDL_GameControllerAxis. */
  static const struct { int x; int y; double angle; } axis_positions[] = {
      {75,  154, 0.0},  /* LEFTX */
      {75,  154, 90.0},  /* LEFTY */
      {305, 230, 0.0},  /* RIGHTX */
      {305, 230, 90.0},  /* RIGHTY */
      {91, 0, 90.0},     /* TRIGGERLEFT */
      {375, 0, 90.0},    /* TRIGGERRIGHT */
  };
  
  SDL_Renderer *screen = NULL;
  SDL_bool retval = SDL_FALSE;
  SDL_bool done = SDL_FALSE;
  SDL_Texture *background, *button, *axis;
  
  static SDL_Texture *
  LoadTexture(SDL_Renderer *renderer, char *file, SDL_bool transparent)
  {
      SDL_Surface *temp = NULL;
      SDL_Texture *texture = NULL;
  
      temp = SDL_LoadBMP(file);
      if (temp == NULL) {
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s", file, SDL_GetError());
      } else {
          /* Set transparent pixel as the pixel at (0,0) */
          if (transparent) {
              if (temp->format->BytesPerPixel == 1) {
                  SDL_SetColorKey(temp, SDL_TRUE, *(Uint8 *)temp->pixels);
              } else {
                  SDL_assert(!temp->format->palette);
                  SDL_assert(temp->format->BitsPerPixel == 24);
                  SDL_SetColorKey(temp, SDL_TRUE, (*(Uint32 *)temp->pixels) & 0x00FFFFFF);
              }
          }
  
          texture = SDL_CreateTextureFromSurface(renderer, temp);
          if (!texture) {
              SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s\n", SDL_GetError());
          }
      }
      if (temp) {
          SDL_FreeSurface(temp);
      }
      return texture;
  }
  
  void
  loop(void *arg)
  {
      SDL_Event event;
      int i;
      SDL_GameController *gamecontroller = (SDL_GameController *)arg;
  
      /* blank screen, set up for drawing this frame. */
      SDL_SetRenderDrawColor(screen, 0xFF, 0xFF, 0xFF, SDL_ALPHA_OPAQUE);
      SDL_RenderClear(screen);
      SDL_RenderCopy(screen, background, NULL, NULL);
  
      while (SDL_PollEvent(&event)) {
          switch (event.type) {
          case SDL_KEYDOWN:
              if (event.key.keysym.sym != SDLK_ESCAPE) {
                  break;
              }
              /* Fall through to signal quit */
          case SDL_QUIT:
              done = SDL_TRUE;
              break;
          default:
              break;
          }
      }
  
      /* Update visual controller state */
      for (i = 0; i < SDL_CONTROLLER_BUTTON_MAX; ++i) {
          if (SDL_GameControllerGetButton(gamecontroller, (SDL_GameControllerButton)i) == SDL_PRESSED) {
              const SDL_Rect dst = { button_positions[i].x, button_positions[i].y, 50, 50 };
              SDL_RenderCopyEx(screen, button, NULL, &dst, 0, NULL, 0);
          }
      }
  
      for (i = 0; i < SDL_CONTROLLER_AXIS_MAX; ++i) {
          const Sint16 deadzone = 8000;  /* !!! FIXME: real deadzone */
          const Sint16 value = SDL_GameControllerGetAxis(gamecontroller, (SDL_GameControllerAxis)(i));
          if (value < -deadzone) {
              const SDL_Rect dst = { axis_positions[i].x, axis_positions[i].y, 50, 50 };
              const double angle = axis_positions[i].angle;
              SDL_RenderCopyEx(screen, axis, NULL, &dst, angle, NULL, 0);
          } else if (value > deadzone) {
              const SDL_Rect dst = { axis_positions[i].x, axis_positions[i].y, 50, 50 };
              const double angle = axis_positions[i].angle + 180.0;
              SDL_RenderCopyEx(screen, axis, NULL, &dst, angle, NULL, 0);
          }
      }
  
      SDL_RenderPresent(screen);
  
      if (!SDL_GameControllerGetAttached(gamecontroller)) {
          done = SDL_TRUE;
          retval = SDL_TRUE;  /* keep going, wait for reattach. */
      }
  }
  
  SDL_bool
  WatchGameController(SDL_GameController * gamecontroller)
  {
      const char *name = SDL_GameControllerName(gamecontroller);
      const char *basetitle = "Game Controller Test: ";
      const size_t titlelen = SDL_strlen(basetitle) + SDL_strlen(name) + 1;
      char *title = (char *)SDL_malloc(titlelen);
      SDL_Window *window = NULL;
      if (title) {
          SDL_snprintf(title, titlelen, "%s%s", basetitle, name);
      }
  
      /* Create a window to display controller state */
      window = SDL_CreateWindow(title, 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);
  
      /* scale for platforms that don't give you the window size you asked for. */
      SDL_RenderSetLogicalSize(screen, SCREEN_WIDTH, SCREEN_HEIGHT);
  
      background = LoadTexture(screen, "controllermap.bmp", SDL_FALSE);
      button = LoadTexture(screen, "button.bmp", SDL_TRUE);
      axis = LoadTexture(screen, "axis.bmp", SDL_TRUE);
  
      if (!background || !button || !axis) {
          SDL_DestroyRenderer(screen);
          SDL_DestroyWindow(window);
          return SDL_FALSE;
      }
      SDL_SetTextureColorMod(button, 10, 255, 21);
      SDL_SetTextureColorMod(axis, 10, 255, 21);
  
      /* !!! FIXME: */
      /*SDL_RenderSetLogicalSize(screen, background->w, background->h);*/
  
      /* Print info about the controller we are watching */
      SDL_Log("Watching controller %s\n",  name ? name : "Unknown Controller");
  
      /* Loop, getting controller events! */
  #ifdef __EMSCRIPTEN__
      emscripten_set_main_loop_arg(loop, gamecontroller, 0, 1);
  #else
      while (!done) {
          loop(gamecontroler);
      }
  #endif
  
      SDL_DestroyRenderer(screen);
      SDL_DestroyWindow(window);
      return retval;
  }
  
  int
  main(int argc, char *argv[])
  {
      int i;
      int nController = 0;
      int retcode = 0;
      char guid[64];
      SDL_GameController *gamecontroller;
  
      /* 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 | SDL_INIT_GAMECONTROLLER ) < 0) {
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
          return 1;
      }
      
      SDL_GameControllerAddMappingsFromFile("gamecontrollerdb.txt");
  
      /* Print information about the controller */
      for (i = 0; i < SDL_NumJoysticks(); ++i) {
          const char *name;
          const char *description;
  
          SDL_JoystickGetGUIDString(SDL_JoystickGetDeviceGUID(i),
                                    guid, sizeof (guid));
  
          if ( SDL_IsGameController(i) )
          {
              nController++;
              name = SDL_GameControllerNameForIndex(i);
              description = "Controller";
          } else {
              name = SDL_JoystickNameForIndex(i);
              description = "Joystick";
          }
          SDL_Log("%s %d: %s (guid %s)\n", description, i, name ? name : "Unknown", guid);
      }
      SDL_Log("There are %d game controller(s) attached (%d joystick(s))\n", nController, SDL_NumJoysticks());
  
      if (argv[1]) {
          SDL_bool reportederror = SDL_FALSE;
          SDL_bool keepGoing = SDL_TRUE;
          SDL_Event event;
          int device = atoi(argv[1]);
          if (device >= SDL_NumJoysticks()) {
  			SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%i is an invalid joystick index.\n", device);
              retcode = 1;
          } else {
              SDL_JoystickGetGUIDString(SDL_JoystickGetDeviceGUID(device),
                                        guid, sizeof (guid));
              SDL_Log("Attempting to open device %i, guid %s\n", device, guid);
              gamecontroller = SDL_GameControllerOpen(device);
              while (keepGoing) {
                  if (gamecontroller == NULL) {
                      if (!reportederror) {
                          if (gamecontroller == NULL) {
                              SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open gamecontroller %d: %s\n", device, SDL_GetError());
                              retcode = 1;
                          }
                          keepGoing = SDL_FALSE;
                          reportederror = SDL_TRUE;
                      }
                  } else {
                      reportederror = SDL_FALSE;
                      keepGoing = WatchGameController(gamecontroller);
                      SDL_GameControllerClose(gamecontroller);
                  }
  
                  gamecontroller = 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_CONTROLLERDEVICEADDED) {
                          gamecontroller = SDL_GameControllerOpen(event.cdevice.which);
                          break;
                      }
                  }
              }
          }
      }
  
      SDL_QuitSubSystem(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK | SDL_INIT_GAMECONTROLLER);
  
      return retcode;
  }
  
  #else
  
  int
  main(int argc, char *argv[])
  {
      SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL compiled without Joystick support.\n");
      exit(1);
  }
  
  #endif
  

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