[Concours] Après la console, place à la SDL

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : main.c
    function : Fonction main
    author   : schadocalex

*/

#include "main.h"
#include "MySDL.h"
#include "map.h"
#include "game.h"

int main(int argc, char** argv)
{
    /* Pour enlever les deux warnings */
    if(argc || argv){}

    return game();
}

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : main.h
    function : Inclusions principales (bibliotèque standard + SDL) et #define pour la SDL
    author   : schadocalex

*/

#ifndef MAIN_H_INCLUDED
#define MAIN_H_INCLUDED

#include <stdio.h>
#include <SDL/SDL.h>

/* Nécéssaire à la modification des pixels */
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
    #define MASQUE_ROUGE 0xff000000
    #define MASQUE_VERT  0x00ff0000
    #define MASQUE_BLEU  0x0000ff00
    #define MASQUE_ALPHA 0x000000ff
#else
    #define MASQUE_ROUGE 0x000000ff
    #define MASQUE_VERT  0x0000ff00
    #define MASQUE_BLEU  0x00ff0000
    #define MASQUE_ALPHA 0xff000000
#endif

#endif /* MAIN_H_INCLUDED */

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : map.c
    function : Fonction de chargement, initialisation et libération de mémoire de la map
    author   : schadocalex

*/

#include "map.h"
#include "MySDL.h"

/* Calcule le nombre de lignes du curseur jusqu'au caractère stop_c
   sans affecter la position du curseur */
int numberLines(const char stop_c, FILE* f)
{
    long actualPosition = ftell(f);
    char c;
    int i = 0;

    do
    {
        c = fgetc(f);
        if(c == '\n')
            i++;
    } while(c != stop_c && c != EOF);
    fseek(f, actualPosition, SEEK_SET);

    return i;
}

int loadMapFloor(Map *map, FILE* f)
{
    int i;

    map->nomberCaseFloor = numberLines(EOF, f);

    if(!(map->floor = malloc(map->nomberCaseFloor * sizeof(Case))))
        return 1;

    for(i = 0; i < map->nomberCaseFloor; i++)
    {
        fscanf(f, "%hu %hu %hu %hu\n", &map->floor[i].position.x, &map->floor[i].position.y, &map->floor[i].chipset.x, &map->floor[i].chipset.y);
        map->floor[i].position.x *= 32;
        map->floor[i].position.y *= 32;

        map->floor[i].chipset.x *= 32;
        map->floor[i].chipset.y *= 32;
        map->floor[i].chipset.w = 32;
        map->floor[i].chipset.h = 32;
    }

    return 0;
}

/* Charge la map dans la structure map */
int loadMap(Map *map, const char* url)
{
    /* Initialisations */
    FILE* f = NULL;
    if(!(f = fopen(url, "r")))
    {
        fprintf(stderr, "Impossible de charger la map %s", url);
        return 1;
    }

    /* Récupération de la largeur et de la hauteur */
    fscanf(f, "%d %d\n\n", &map->w, &map->h);

    /* Chargement de la map */
    if(loadMapFloor(map, f))
        return 1;

    fprintf(stdout, "Chargement de la map réussi.\n");

    return 0;
}

/* Charge la map dans la structure map */
void loadMapChipset(Map *map, const char* url, const char* url_masque)
{
    map->chipset = loadImage(url);
    map->chipset_masque = loadImage(url_masque);
}

int initialiseMap(Map *map, int nb_map)
{
    if(nb_map == 1)
    {
        if(loadMap(map, "map/1.map"))
            return 1;
        loadMapChipset(map, "img/grass.png", "img/grass_masque.png");
    }
    return 0;
}

void freeMap(Map *map)
{
    free(map->floor);
}

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : map.h
    function : Structures (Case, Map) et prototypes des fonctions de map.c
    author   : schadocalex

*/

#ifndef MAP_H_INCLUDED
#define MAP_H_INCLUDED

#include "main.h"

typedef struct
{
    SDL_Rect chipset;
    SDL_Rect position;
} Case;

typedef struct
{
    SDL_Surface* chipset;
    SDL_Surface* chipset_masque;

    int w;
    int h;
    int nomberCaseFloor;

    Case* floor;
    Case* PF;
} Map;

int numberLines(const char stop_c, FILE* f);
int loadMapFloor(Map *map, FILE* f);
int loadMap(Map *map, const char* url);
void loadMapChipset(Map *map, const char* url, const char* url_masque);
int initialiseMap(Map *map, int nb_map);
void freeMap(Map *map);

#endif /* MAP_H_INCLUDED */

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : events.c
    function : Gestion des events propre
    author   : schadocalex (remerciements à Fvirtman pour son tutoriel)

*/

#include "main.h"
#include "events.h"

/* Mis à jour des events
   Enregistrement du moment ou l'on a appuyé sur une touche,
   Pour une meilleure gestion des events */
void UpdateEvents(Input* in)
{
	SDL_Event event;
	while(SDL_PollEvent(&event))
	{
		switch (event.type)
		{
            case SDL_KEYDOWN:
                if(in->key[event.key.keysym.sym] == 0)
                    in->key[event.key.keysym.sym] = SDL_GetTicks();
            break;
            case SDL_KEYUP:
                in->key[event.key.keysym.sym] = 0;
            break;
            case SDL_QUIT:
                in->quit = 1;
            break;
            default: break;
		}
	}
}

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : events.h
    function : Structure (Input) et prototype de events.c
    author   : schadocalex (remerciements à Fvirtman pour son tutoriel)

*/

#ifndef EVENTS_H_INCLUDED
#define EVENTS_H_INCLUDED

typedef struct
{
	int key[SDLK_LAST];
    char quit;
} Input;

void UpdateEvents(Input* in);

#endif /* EVENTS_H_INCLUDED */

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : pixel.c
    function : Fonctions d'écriture et de lecture de pixels
    author   : schadocalex (remerciements à Piwaï pour son tutoriel)

*/

#include "main.h"
#include "pixel.h"

Uint32 getPixel(SDL_Surface* surface, int x, int y)
{
    int BytesPerPixel = surface->format->BytesPerPixel;
    Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * BytesPerPixel;

    switch(BytesPerPixel)
    {
        case 1:
            return *p;
        case 2:
            return *(Uint16 *)p;
        case 3:
            if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
                return p[0] << 16 | p[1] << 8 | p[2];
            else
                return p[0] | p[1] << 8 | p[2] << 16;
        case 4:
            return *(Uint32 *)p;
        default:
            return 0;
    }
}

void setPixel(Uint32 pixel, SDL_Surface *surface, int x, int y)
{
    int BytesPerPixel = surface->format->BytesPerPixel;
    Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * BytesPerPixel;

    switch(BytesPerPixel)
    {
        case 1:
            *p = pixel;
        break;
        case 2:
            *(Uint16 *)p = pixel;
        break;
        case 3:
            if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
            {
                p[0] = (pixel >> 16) & 0xff;
                p[1] = (pixel >> 8) & 0xff;
                p[2] = pixel & 0xff;
            }
            else
            {
                p[0] = pixel & 0xff;
                p[1] = (pixel >> 8) & 0xff;
                p[2] = (pixel >> 16) & 0xff;
            }
        break;
        case 4:
            *(Uint32 *)p = pixel;
        break;
    }
}

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : pixel.h
    function : Structure (Pixel) et prototypes de pixel.c
    author   : schadocalex (remerciements à Piwaï pour son tutoriel)

*/

#ifndef PIXEL_H_INCLUDED
#define PIXEL_H_INCLUDED

typedef struct
{
    Uint8 r;
    Uint8 g;
    Uint8 b;
    Uint8 a;
} Pixel;

Uint32 getPixel(SDL_Surface* surface, int x, int y);
void setPixel(Uint32 pixel, SDL_Surface *surface, int x, int y);

#endif /* PIXEL_H_INCLUDED */

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : MySDL.c
    function : Extension de la SDL
    author   : schadocalex

*/

#include <SDL/SDL_Image.h>

#include "main.h"
#include "MySDL.h"

/* Charge une image */
SDL_Surface* loadImage(const char* url)
{
    SDL_Surface* img = IMG_Load(url);
    if(!img)
    {
        fprintf(stderr, "Impossible d'ouvrir %s\n", url);
        exit(EXIT_FAILURE);
    }
    else
        fprintf(stdout, "Chargement de %s\n", url);
    return img;
}

/* Initialise la SDL et la fenêtre */
SDL_Surface* MySDL_Init(int largeur, int hauteur)
{
    /* Initialisation de la SDL */
    if(SDL_Init(SDL_INIT_VIDEO) < 0)
    {
        fprintf(stderr, "Impossible d'initialiser la SDL : %s\n", SDL_GetError());
        exit(EXIT_FAILURE);
    }
    else
        fprintf(stdout, "Initialisation de la SDL\n");

    /* On ferme la SDL à la fin du programme */
    atexit(SDL_Quit);

    /* Création de la fenêtre */
    SDL_Surface* screen = SDL_SetVideoMode(largeur, hauteur, 32,
                                           SDL_SWSURFACE | SDL_DOUBLEBUF);
    if(!screen)
    {
        fprintf(stderr, "Impossible de créer une fenêtre de %dx%d : %s\n", largeur, hauteur, SDL_GetError());
        exit(EXIT_FAILURE);
    }
    else
        fprintf(stdout, "Création de la fenêtre\n");
    SDL_WM_SetCaption("Delthera - build 1", NULL);

    return screen;
}

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : MySDL.h
    function : Prototype de MySDL.c
    author   : schadocalex

*/

#ifndef MYSDL_H_INCLUDED
#define MYSDL_H_INCLUDED

SDL_Surface* loadImage(const char* url);
SDL_Surface* MySDL_Init(int largeur, int hauteur);

#endif /* MYSDL_H_INCLUDED */

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : game.c
    function : Fonction game qui sert de boucle principale du jeu
    author   : schadocalex

*/

#include "main.h"
#include "map.h"
#include "game.h"
#include "MySDL.h"
#include "player.h"
#include "events.h"

int game()
{
    Map map;
    Player player;
    SDL_Surface *screen, *screenMasque;
    char continuer = 1;
    int i;

    if(initialiseMap(&map, 1))
        return 1;

    /* screen */
    if((screen = MySDL_Init(map.w * 32, map.h * 32)) == NULL)
        return 1;
    SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 255, 255, 255));

    /* screen masque */
    screenMasque = SDL_CreateRGBSurface(SDL_HWSURFACE, map.w * 32, map.h * 32, 32, 0, 0, 0, 0);
    SDL_FillRect(screenMasque, NULL, SDL_MapRGB(screen->format, 255, 255, 255));

    /* décor */
    for(i = 0; i < map.nomberCaseFloor; i++)
    {
        SDL_BlitSurface(map.chipset, &map.floor[i].chipset, screen, &map.floor[i].position);
        SDL_BlitSurface(map.chipset_masque, &map.floor[i].chipset, screenMasque, &map.floor[i].position);
    }

    player_initialise(&player, "img/player.png");

    SDL_Rect temp;

    Input in;
    memset(&in,0, sizeof(in));

    while(continuer)
    {
        UpdateEvents(&in);

        if(in.quit || in.key[SDLK_ESCAPE])
            continuer = 0;

        temp.x = player.position.x;
        temp.y = player.position.y + 2;
        temp.w = player.player_act.w;
        temp.h = player.player_act.h;

        if(in.key[SDLK_LEFT] > in.key[SDLK_RIGHT])
            player.v_x = -4;
        else if(in.key[SDLK_RIGHT])
            player.v_x = 4;
        else
            player.v_x = 0;

        if(in.key[SDLK_UP] && collision(screenMasque, temp))
        {
            if(player.v_s <= 0)
                player.v_s = 6;
        }

        player_animation(&player, 60, screenMasque);
        player_move(&player, screenMasque);

        SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 255, 255, 255));
        for(i = 0; i < map.nomberCaseFloor; i++)
        {
            SDL_BlitSurface(map.chipset, &map.floor[i].chipset, screen, &map.floor[i].position);
            SDL_BlitSurface(map.chipset_masque, &map.floor[i].chipset, screenMasque, &map.floor[i].position);
        }

        SDL_BlitSurface(player.charset, &player.player_act, screen, &player.position);

        SDL_Delay(40);

        SDL_Flip(screen);
    }

    freeMap(&map);
    SDL_free(screenMasque);

    return 0;
}

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : game.h
    function : Prototype des fonctions de game.c
    author   : schadocalex

*/

#ifndef GAME_H_INCLUDED
#define GAME_H_INCLUDED

int game(void);

#endif /* GAME_H_INCLUDED */

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : player.c
    function : Fonctions relatives au joueur (initialisation, déplacements, animation etc.)
    author   : schadocalex

*/

#include "main.h"
#include "player.h"
#include "pixel.h"
#include "MySDL.h"

/* Initialise un personnage pour le joueur */
void player_initialise(Player *player, const char* url)
{
    player->charset = loadImage(url);
    player->v_x = 0;
    player->v_y = 5;
    player->v_s = 0;
    player->player_act.x = 0;
    player->player_act.y = 0;
    player->player_act.w = PLAYER_WIDTH;
    player->player_act.h = player->charset->h / 4;
    player->position.x = 0;
    player->position.y = 100;
    player->jump = 0;
}

/* Change la frame du personnage si elle
   a été changée depuis plus de x ms */
void player_animation(Player *player, unsigned int x, SDL_Surface* screenMasque)
{
    static unsigned int previousTime = 0;
    if(SDL_GetTicks() - previousTime < x)
        return;
    else
        previousTime = SDL_GetTicks();

    /* Pour tester si le joueur est proche du sol ou d'une plateforme */
    SDL_Rect temp;
    temp.x = player->position.x;
    temp.y = player->position.y + 30;
    temp.w = PLAYER_WIDTH;
    temp.h = PLAYER_HEIGHT;

    int nextToFloor = collision(screenMasque, temp);
    int player_direction = (player->player_act.y < PLAYER_Y_LEFT) ? 0 : PLAYER_Y_LEFT;

    /** GAUCHE <-> DROITE **/
    if(player->v_x < 0 && player->player_act.y < PLAYER_Y_LEFT) /* Si le perso va à gauche, mais qu'il ne regarde pas à gauche */
        player->player_act.y += PLAYER_Y_LEFT;
    else if(player->v_x > 0 && player->player_act.y >= PLAYER_Y_LEFT) /* Sinon si le perso va à droite, mais qu'il ne regarde pas à droite */
        player->player_act.y -= PLAYER_Y_LEFT;

    /** JUMPING **/
    if(player->jump == 0 && player->v_s > 0) /* Si le perso doit sauter mais qu'il n'est pas prêt */
    {
        player->jump = 1;
        player->player_act.x = PLAYER_X_CAN_JUMP;
        player->player_act.y = (player_direction + PLAYER_Y_JUMPING);
    }
    else if(player->jump) /* Sinon si il peut sauter ou qu'il est entrain de sauter */
    {
        if(player->v_s <= 0 && nextToFloor) /* Si le joueur va atterir sur un sol ou une plateforme */
        {
            if(player->player_act.x > PLAYER_X_STOP_JUMPING) /* Si le perso n'est pas prêt pour courir */
                player->player_act.x -= PLAYER_WIDTH;
            else
            {
                player->jump = 0;
                player->player_act.x = PLAYER_WIDTH;
                player->player_act.y = player_direction;
            }
        }
        else
        {
            player->player_act.x += PLAYER_WIDTH;
            if(player->player_act.x >= player->charset->w)
                player->player_act.x = player->charset->w - PLAYER_WIDTH;
        }
    }

    /** NORMAL **/
    if(player->player_act.y == player_direction && player->v_s <= 0) /* S'il est entrain de courir */
    {
        if(player->v_x == 0) /* Si le joueur n'avance plus */
            player->player_act.x = 0;
        else
        {
            player->player_act.x += PLAYER_WIDTH;
            if(player->player_act.x >= player->charset->w)
                player->player_act.x = PLAYER_WIDTH;
        }
    }
}

/* Teste si il y a collision */
int collision(SDL_Surface* screenMasque, SDL_Rect player)
{
    SDL_LockSurface(screenMasque);
    Uint32 pixel;
    Uint8 r, g, b;
    int i, j;

    player.x += 10;
    player.w -= 20;
    player.h -= 1;

    if(screenMasque->w < player.x + player.w + 5 ||
       screenMasque->h < player.y + player.h ||
       player.x < 0                          ||
       player.y < 0)
        return 1;

    for(i = 0; i <= player.w; i++)
        for(j = 0; j <= player.h; j++)
        {
            pixel = getPixel(screenMasque, player.x + i, player.y + j);
            SDL_GetRGB(pixel, screenMasque->format, &r, &g, &b);
            if(r < 20 && g < 20 && b < 20)
            {
                SDL_UnlockSurface(screenMasque);
                return 1;
            }
        }

    SDL_UnlockSurface(screenMasque);
    return 0;
}

/* Incémente ou décrémente n pour se rapprocher de 0, ou ne fait rien si n = 0 */
int goZero(int n)
{
    return (n < 0) ? (n + 1) : ((n > 0) ? n - 1 : 0);
}

/* Bouge le joueur grâce au vecteur vitesse (v_x;v_y) ainsi qu'au vecteur vertical de saut v_s */
void player_move(Player *player, SDL_Surface* screenMasque)
{
    int dx = (int)player->v_x, dy = (int)player->v_y;

    /* Pour tester si le joueur est proche du sol ou d'une plateforme */
    SDL_Rect temp;
    temp.x = player->position.x;
    temp.y = player->position.y + 40;
    temp.w = PLAYER_WIDTH;
    temp.h = PLAYER_HEIGHT;

    int i = 0;
    int limitey = (dy < 0) ? -1 : 1;

    /* saut */
    if(player->v_s > 0 && player->jump) /* Si le joueur doit sauter */
    {
        dy = -player->v_s;
        player->v_s -= 0.5;
        if(player->v_s < 0)
            player->v_s = 0;
    }

    /* Boucle avec le vecteur vitesse attendu */
    while(1)
    {
        if(dy == limitey)
            break;

        temp.x = player->position.x + dx;
        temp.y = player->position.y + dy;

        if(!collision(screenMasque, temp))
        {
            player->position.x += dx;
            player->position.y += dy;
            return;
        }

        if(i % 2 == 0)
            dx = goZero(dx);
        else
            dy = goZero(dy);
        i++;
    }

    /* Si ce n'est pas concluant, boucle avec un vecteur vitesse horizontal */
    dx = (int)player->v_x;
    dy = 1;
    while(1)
    {
        if(dx == 0)
            break;

        temp.x = player->position.x + dx;
        temp.y = player->position.y + dy;

        if(!collision(screenMasque, temp))
        {
            player->position.x += dx;
            player->position.y += dy;
            return;
        }

        if(i % 2 == 0)
            dx = goZero(dx);
        else
            dy--;
        i++;
    }
}

/*
     ____      _____    _       _____    _   _    _____    _____     _____
    |  __ \   |  ___|  | |     |_   _|  | | | |  |  ___|  |  _  |   |  _  |
    | |  | |  | |_     | |       | |    | |_| |  | |_     | |_| |   | |_| |
    | |  | |  |  _|    | |       | |    |  _  |  |  _|    |  _  /   |  _  |
    | |__| |  | |___   | |___    | |    | | | |  | |___   | | \ \   | | | |
    |____ /   |_____|  |_____|   |_|    |_| |_|  |_____|  |_|  \_\  |_| |_|

    name     : player.h
    function : Structure (Player), prototypes de player.c et #define des frames du charset
    author   : schadocalex

*/

#ifndef PLAYER_H_INCLUDED
#define PLAYER_H_INCLUDED

#define PLAYER_WIDTH 27
#define PLAYER_HEIGHT 39
#define PLAYER_Y_RIGHT 0
#define PLAYER_Y_LEFT (2*PLAYER_HEIGHT)
#define PLAYER_X_CAN_JUMP (5*PLAYER_WIDTH)
#define PLAYER_X_STOP_JUMPING (8*PLAYER_WIDTH)
#define PLAYER_Y_JUMPING PLAYER_HEIGHT

typedef struct
{
    SDL_Rect player_act; /* Frame du charset actuelle */
    SDL_Rect position; /* Position dans l'écran */

    SDL_Surface* charset; /* Image charset du joueur */

    double v_x, v_y, v_s; /* (v_x;v_y) => coordonées du vecteur vitesse */
                          /* v_s => Hauteur du saut, influe sur v_y */
    char jump; /* Est positionné pour sauter ou est entrain de sauter*/
} Player;

void player_initialise(Player *player, const char* url);
int player_direction(Player *player);
void player_animation(Player *player, unsigned int x, SDL_Surface* screenMasque);
int collision(SDL_Surface* screenMasque, SDL_Rect player);
int goZero(int n);
void player_move(Player *player, SDL_Surface* screenMasque);

#endif /* PLAYER_H_INCLUDED */