#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "SDL.h"

Include dependency graph for testgamecontroller.c:

Macros
#define	SCREEN_WIDTH 512
#define	SCREEN_HEIGHT 320

Functions
static SDL_Texture *	LoadTexture (SDL_Renderer renderer, const char file, SDL_bool transparent)
void	loop (void *arg)
SDL_bool	WatchGameController (SDL_GameController *gamecontroller)
int	main (int argc, char *argv[])

Variables
struct {
int x
int y
}	button_positions []
struct {
int x
int y
double angle
}	axis_positions []
SDL_Renderer *	screen = NULL
SDL_bool	retval = SDL_FALSE
SDL_bool	done = SDL_FALSE
SDL_Texture *	background
SDL_Texture *	button
SDL_Texture *	axis

Macro Definition Documentation

#define SCREEN_HEIGHT 320

Definition at line 32 of file testgamecontroller.c.

Referenced by WatchGameController().

#define SCREEN_WIDTH 512

Definition at line 31 of file testgamecontroller.c.

Referenced by WatchGameController().

Function Documentation

static SDL_Texture* LoadTexture	(	SDL_Renderer *	renderer,
		const char *	file,
		SDL_bool	transparent
	)

static

Definition at line 70 of file testgamecontroller.c.

References SDL_PixelFormat::BytesPerPixel, SDL_Surface::format, NULL, SDL_Surface::pixels, SDL_CreateTextureFromSurface, SDL_FreeSurface, SDL_GetError, SDL_LoadBMP, SDL_LOG_CATEGORY_APPLICATION, SDL_LogError, SDL_SetColorKey, and SDL_TRUE.

{
    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);
            }
        }
        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 )

Definition at line 98 of file testgamecontroller.c.

References SDL_ControllerAxisEvent::axis, axis_positions, SDL_ControllerButtonEvent::button, button_positions, SDL_Event::caxis, SDL_Event::cbutton, done, i, SDL_Event::key, SDL_KeyboardEvent::keysym, NULL, retval, SDL_ALPHA_OPAQUE, SDL_CONTROLLER_AXIS_MAX, SDL_CONTROLLER_BUTTON_A, SDL_CONTROLLER_BUTTON_MAX, SDL_CONTROLLERAXISMOTION, SDL_CONTROLLERBUTTONDOWN, SDL_CONTROLLERBUTTONUP, SDL_FLIP_NONE, SDL_GameControllerGetAttached, SDL_GameControllerGetAxis, SDL_GameControllerGetButton, SDL_GameControllerGetStringForAxis, SDL_GameControllerGetStringForButton, SDL_GameControllerRumble, SDL_KEYDOWN, SDL_Log, SDL_PollEvent, SDL_PRESSED, SDL_QUIT, SDL_RenderClear, SDL_RenderCopy, SDL_RenderCopyEx, SDL_RenderPresent, SDL_SetRenderDrawColor, SDL_TRUE, SDLK_ESCAPE, SDL_ControllerButtonEvent::state, SDL_Keysym::sym, SDL_Event::type, and SDL_ControllerAxisEvent::value.

{
    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_CONTROLLERAXISMOTION:
            SDL_Log("Controller axis %s changed to %d\n", SDL_GameControllerGetStringForAxis((SDL_GameControllerAxis)event.caxis.axis), event.caxis.value);
            break;
        case SDL_CONTROLLERBUTTONDOWN:
        case SDL_CONTROLLERBUTTONUP:
            SDL_Log("Controller button %s %s\n", SDL_GameControllerGetStringForButton((SDL_GameControllerButton)event.cbutton.button), event.cbutton.state ? "pressed" : "released");
            /* First button triggers a 0.5 second full strength rumble */
            if (event.type == SDL_CONTROLLERBUTTONDOWN &&
                event.cbutton.button == SDL_CONTROLLER_BUTTON_A) {
                SDL_GameControllerRumble(gamecontroller, 0xFFFF, 0xFFFF, 500);
            }
            break;
        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, SDL_FLIP_NONE);
        }
    }
    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, SDL_FLIP_NONE);
        } 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, SDL_FLIP_NONE);
        }
    }
    SDL_RenderPresent(screen);
    if (!SDL_GameControllerGetAttached(gamecontroller)) {
        done = SDL_TRUE;
        retval = SDL_TRUE;  /* keep going, wait for reattach. */
    }
#ifdef __EMSCRIPTEN__
    if (done) {
        emscripten_cancel_main_loop();
    }
#endif
}

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 251 of file testgamecontroller.c.

References SDL_Event::cdevice, device, i, NULL, SDL_assert, SDL_CONTROLLERDEVICEADDED, SDL_FALSE, SDL_FINGERDOWN, SDL_free, SDL_GameControllerAddMappingsFromFile, SDL_GameControllerClose, SDL_GameControllerFromInstanceID, SDL_GameControllerGetJoystick, SDL_GameControllerMappingForIndex, SDL_GameControllerNameForIndex, SDL_GameControllerNumMappings, SDL_GameControllerOpen, SDL_GetError, SDL_Init, SDL_INIT_GAMECONTROLLER, SDL_INIT_JOYSTICK, SDL_INIT_VIDEO, SDL_IsGameController, SDL_JoystickGetDeviceGUID, SDL_JoystickGetDeviceProduct, SDL_JoystickGetDeviceVendor, SDL_JoystickGetGUIDString, SDL_JoystickInstanceID, SDL_JoystickNameForIndex, SDL_Log, SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, SDL_LogError, SDL_LogSetPriority, SDL_MOUSEBUTTONDOWN, SDL_NumJoysticks, SDL_QUIT, SDL_QuitSubSystem, SDL_TRUE, SDL_WaitEvent, SDL_Event::type, WatchGameController(), and SDL_ControllerDeviceEvent::which.

{
    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 mappings */
    if (!argv[1]) {
        SDL_Log("Supported mappings:\n");
        for (i = 0; i < SDL_GameControllerNumMappings(); ++i) {
            char *mapping = SDL_GameControllerMappingForIndex(i);
            if (mapping) {
                SDL_Log("\t%s\n", mapping);
                SDL_free(mapping);
            }
        }
        SDL_Log("\n");
    }
    /* 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, VID 0x%.4x, PID 0x%.4x)\n",
            description, i, name ? name : "Unknown", guid,
            SDL_JoystickGetDeviceVendor(i), SDL_JoystickGetDeviceProduct(i));
    }
    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);
            if (gamecontroller != NULL) {
                SDL_assert(SDL_GameControllerFromInstanceID(SDL_JoystickInstanceID(SDL_GameControllerGetJoystick(gamecontroller))) == gamecontroller);
            }
            while (keepGoing) {
                if (gamecontroller == NULL) {
                    if (!reportederror) {
                        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);
                        if (gamecontroller != NULL) {
                            SDL_assert(SDL_GameControllerFromInstanceID(SDL_JoystickInstanceID(SDL_GameControllerGetJoystick(gamecontroller))) == gamecontroller);
                        }
                        break;
                    }
                }
            }
        }
    }
    SDL_QuitSubSystem(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK | SDL_INIT_GAMECONTROLLER);
    return retcode;
}

SDL_bool WatchGameController ( SDL_GameController * gamecontroller )

Definition at line 173 of file testgamecontroller.c.

References done, LoadTexture(), loop(), NULL, retval, SCREEN_HEIGHT, SCREEN_WIDTH, SDL_ALPHA_OPAQUE, SDL_CreateRenderer, SDL_CreateWindow, SDL_DestroyRenderer, SDL_DestroyWindow, SDL_FALSE, SDL_free, SDL_GameControllerName, SDL_GetError, SDL_Log, SDL_LOG_CATEGORY_APPLICATION, SDL_LogError, SDL_malloc, SDL_RaiseWindow, SDL_RenderClear, SDL_RenderPresent, SDL_RenderSetLogicalSize, SDL_SetRenderDrawColor, SDL_SetTextureColorMod, SDL_snprintf, SDL_strlen, SDL_TRUE, and SDL_WINDOWPOS_CENTERED.

Referenced by main().

{
    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;
    retval = SDL_FALSE;
    done = SDL_FALSE;
    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);
    SDL_free(title);
    title = NULL;
    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(gamecontroller);
    }
#endif
    SDL_DestroyRenderer(screen);
    screen = NULL;
    background = NULL;
    button = NULL;
    axis = NULL;
    SDL_DestroyWindow(window);
    return retval;
}