test/testgamecontroller.c
author Philipp Wiesemann <philipp.wiesemann@arcor.de>
Wed, 17 Aug 2016 21:04:50 +0200
changeset 10275 ba7dc3ebb81e
parent 10162 562b819414b5
permissions -rw-r--r--
Emscripten: Fixed opening previously closed joystick.
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/*
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  Copyright (C) 1997-2016 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 game controller 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    480
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#define SCREEN_HEIGHT    320
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#else
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#define SCREEN_WIDTH    512
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#define SCREEN_HEIGHT   317
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#endif
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/* This is indexed by SDL_GameControllerButton. */
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static const struct { int x; int y; } button_positions[] = {
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    {387, 167},  /* A */
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    {431, 132},  /* B */
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    {342, 132},  /* X */
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    {389, 101},  /* Y */
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    {174, 132},  /* BACK */
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    {233, 132},  /* GUIDE */
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    {289, 132},  /* START */
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    {75,  154},  /* LEFTSTICK */
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    {305, 230},  /* RIGHTSTICK */
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    {77,  40},   /* LEFTSHOULDER */
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    {396, 36},   /* RIGHTSHOULDER */
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    {154, 188},  /* DPAD_UP */
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    {154, 249},  /* DPAD_DOWN */
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    {116, 217},  /* DPAD_LEFT */
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    {186, 217},  /* DPAD_RIGHT */
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};
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/* This is indexed by SDL_GameControllerAxis. */
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static const struct { int x; int y; double angle; } axis_positions[] = {
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    {75,  154, 0.0},  /* LEFTX */
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    {75,  154, 90.0},  /* LEFTY */
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    {305, 230, 0.0},  /* RIGHTX */
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    {305, 230, 90.0},  /* RIGHTY */
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    {91, 0, 90.0},     /* TRIGGERLEFT */
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    {375, 0, 90.0},    /* TRIGGERRIGHT */
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};
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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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SDL_Texture *background, *button, *axis;
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static SDL_Texture *
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LoadTexture(SDL_Renderer *renderer, char *file, SDL_bool transparent)
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{
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    SDL_Surface *temp = NULL;
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    SDL_Texture *texture = NULL;
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    temp = SDL_LoadBMP(file);
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    if (temp == NULL) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s", file, SDL_GetError());
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    } else {
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        /* Set transparent pixel as the pixel at (0,0) */
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        if (transparent) {
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            if (temp->format->BytesPerPixel == 1) {
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                SDL_SetColorKey(temp, SDL_TRUE, *(Uint8 *)temp->pixels);
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            } else {
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                SDL_assert(!temp->format->palette);
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                SDL_assert(temp->format->BitsPerPixel == 24);
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                SDL_SetColorKey(temp, SDL_TRUE, (*(Uint32 *)temp->pixels) & 0x00FFFFFF);
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            }
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        }
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        texture = SDL_CreateTextureFromSurface(renderer, temp);
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        if (!texture) {
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s\n", SDL_GetError());
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        }
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    }
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    if (temp) {
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        SDL_FreeSurface(temp);
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    }
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    return texture;
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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_GameController *gamecontroller = (SDL_GameController *)arg;
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    /* blank screen, set up for drawing this frame. */
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    SDL_SetRenderDrawColor(screen, 0xFF, 0xFF, 0xFF, SDL_ALPHA_OPAQUE);
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    SDL_RenderClear(screen);
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    SDL_RenderCopy(screen, background, NULL, NULL);
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    while (SDL_PollEvent(&event)) {
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        switch (event.type) {
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        case SDL_KEYDOWN:
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            if (event.key.keysym.sym != SDLK_ESCAPE) {
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                break;
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            }
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            /* Fall through to signal quit */
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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 controller state */
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    for (i = 0; i < SDL_CONTROLLER_BUTTON_MAX; ++i) {
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        if (SDL_GameControllerGetButton(gamecontroller, (SDL_GameControllerButton)i) == SDL_PRESSED) {
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            const SDL_Rect dst = { button_positions[i].x, button_positions[i].y, 50, 50 };
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            SDL_RenderCopyEx(screen, button, NULL, &dst, 0, NULL, 0);
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        }
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    }
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    for (i = 0; i < SDL_CONTROLLER_AXIS_MAX; ++i) {
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        const Sint16 deadzone = 8000;  /* !!! FIXME: real deadzone */
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        const Sint16 value = SDL_GameControllerGetAxis(gamecontroller, (SDL_GameControllerAxis)(i));
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        if (value < -deadzone) {
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            const SDL_Rect dst = { axis_positions[i].x, axis_positions[i].y, 50, 50 };
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            const double angle = axis_positions[i].angle;
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            SDL_RenderCopyEx(screen, axis, NULL, &dst, angle, NULL, 0);
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        } else if (value > deadzone) {
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            const SDL_Rect dst = { axis_positions[i].x, axis_positions[i].y, 50, 50 };
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            const double angle = axis_positions[i].angle + 180.0;
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            SDL_RenderCopyEx(screen, axis, NULL, &dst, angle, NULL, 0);
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        }
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    }
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    SDL_RenderPresent(screen);
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    if (!SDL_GameControllerGetAttached(gamecontroller)) {
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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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SDL_bool
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WatchGameController(SDL_GameController * gamecontroller)
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{
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    const char *name = SDL_GameControllerName(gamecontroller);
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    const char *basetitle = "Game Controller Test: ";
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    const size_t titlelen = SDL_strlen(basetitle) + SDL_strlen(name) + 1;
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    char *title = (char *)SDL_malloc(titlelen);
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    SDL_Window *window = NULL;
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    retval = SDL_FALSE;
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    done = SDL_FALSE;
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    if (title) {
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        SDL_snprintf(title, titlelen, "%s%s", basetitle, name);
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    }
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    /* Create a window to display controller state */
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    window = SDL_CreateWindow(title, SDL_WINDOWPOS_CENTERED,
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                              SDL_WINDOWPOS_CENTERED, SCREEN_WIDTH,
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                              SCREEN_HEIGHT, 0);
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    SDL_free(title);
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    title = NULL;
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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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    /* scale for platforms that don't give you the window size you asked for. */
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    SDL_RenderSetLogicalSize(screen, SCREEN_WIDTH, SCREEN_HEIGHT);
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    background = LoadTexture(screen, "controllermap.bmp", SDL_FALSE);
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    button = LoadTexture(screen, "button.bmp", SDL_TRUE);
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    axis = LoadTexture(screen, "axis.bmp", SDL_TRUE);
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    if (!background || !button || !axis) {
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        SDL_DestroyRenderer(screen);
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        SDL_DestroyWindow(window);
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        return SDL_FALSE;
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    }
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    SDL_SetTextureColorMod(button, 10, 255, 21);
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    SDL_SetTextureColorMod(axis, 10, 255, 21);
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    /* !!! FIXME: */
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    /*SDL_RenderSetLogicalSize(screen, background->w, background->h);*/
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    /* Print info about the controller we are watching */
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    SDL_Log("Watching controller %s\n",  name ? name : "Unknown Controller");
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    /* Loop, getting controller events! */
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#ifdef __EMSCRIPTEN__
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    emscripten_set_main_loop_arg(loop, gamecontroller, 0, 1);
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#else
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    while (!done) {
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        loop(gamecontroller);
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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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    background = NULL;
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    button = NULL;
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    axis = 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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    int i;
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    int nController = 0;
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    int retcode = 0;
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    char guid[64];
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    SDL_GameController *gamecontroller;
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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 | SDL_INIT_GAMECONTROLLER ) < 0) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
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        return 1;
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    }
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    SDL_GameControllerAddMappingsFromFile("gamecontrollerdb.txt");
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    /* Print information about the controller */
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    for (i = 0; i < SDL_NumJoysticks(); ++i) {
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        const char *name;
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        const char *description;
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        SDL_JoystickGetGUIDString(SDL_JoystickGetDeviceGUID(i),
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                                  guid, sizeof (guid));
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        if ( SDL_IsGameController(i) )
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        {
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            nController++;
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            name = SDL_GameControllerNameForIndex(i);
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            description = "Controller";
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        } else {
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            name = SDL_JoystickNameForIndex(i);
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            description = "Joystick";
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        }
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        SDL_Log("%s %d: %s (guid %s)\n", description, i, name ? name : "Unknown", guid);
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    }
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    SDL_Log("There are %d game controller(s) attached (%d joystick(s))\n", nController, SDL_NumJoysticks());
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    if (argv[1]) {
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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 = atoi(argv[1]);
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        if (device >= SDL_NumJoysticks()) {
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%i is an invalid joystick index.\n", device);
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            retcode = 1;
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        } else {
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            SDL_JoystickGetGUIDString(SDL_JoystickGetDeviceGUID(device),
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                                      guid, sizeof (guid));
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            SDL_Log("Attempting to open device %i, guid %s\n", device, guid);
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            gamecontroller = SDL_GameControllerOpen(device);
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            if (gamecontroller != NULL) {
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                SDL_assert(SDL_GameControllerFromInstanceID(SDL_JoystickInstanceID(SDL_GameControllerGetJoystick(gamecontroller))) == gamecontroller);
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            }
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            while (keepGoing) {
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                if (gamecontroller == NULL) {
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                    if (!reportederror) {
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                        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open gamecontroller %d: %s\n", device, SDL_GetError());
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                        retcode = 1;
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                        keepGoing = SDL_FALSE;
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                        reportederror = SDL_TRUE;
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                    }
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   309
                } else {
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                    reportederror = SDL_FALSE;
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                    keepGoing = WatchGameController(gamecontroller);
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                    SDL_GameControllerClose(gamecontroller);
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                }
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                gamecontroller = 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;
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   324
                    } else if (event.type == SDL_CONTROLLERDEVICEADDED) {
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                        gamecontroller = SDL_GameControllerOpen(event.cdevice.which);
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   326
                        if (gamecontroller != NULL) {
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                            SDL_assert(SDL_GameControllerFromInstanceID(SDL_JoystickInstanceID(SDL_GameControllerGetJoystick(gamecontroller))) == gamecontroller);
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                        }
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                        break;
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   330
                    }
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   331
                }
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            }
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        }
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    }
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    SDL_QuitSubSystem(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK | SDL_INIT_GAMECONTROLLER);
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    return retcode;
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}
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   341
#else
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int
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main(int argc, char *argv[])
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{
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   346
    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL compiled without Joystick support.\n");
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    exit(1);
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}
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   350
#endif