mutator.c

#include <genesis.h>
#include "mutator.h"
#include "defs.h"

extern _mods mods;
#define MAX_MODS (sizeof(_mods) / sizeof(u8))

void generateModsList();

void initMods() {
    generateModsList();
}

static const char* mods_text[] = {
      "enemy's speed increased"
    , "enemy's armor increased"
    , "enemy crushes steel walls"
    , "enemy's shells speed increased"
    , "enemy's spawn speed increased"
    , "number of enemies increased"
    , "enemy used player skin"
    , "player's speed decrease"
    , "player used enemy skin"
    , "rubber steel walls"
    , "enemy goes through walls"
    , "player kills player"
    , "no bonuses"
    , "enemies on map increased"
    , "enemies start with shield"
    , "player start without shield"
    , "player is ass killer"
    , "the enemy is invulnerable"
};

static const char *text[MAX_MODS_ON_LEVEL] = { 0 };

void showModText() {
    u8 i;
    for (i = 0; i < config.mods_count; i++) {
        VDP_drawTextBG(PLAN_A, text[i], 16 - strlen(text[i]) / 2, 16 + i*2);
    }
}

// Fisher-Yates shuffle
static void shuffle_u16(u16 array[], u16 n) {
    while (n > 1) {
        u16 k = random() % n;
        n--;
        SWAP_u16(array[k], array[n]);
    }
}

void generateModsList() {
    mods.en_speed = 0;
    mods.en_armor = 0;
    mods.en_uranium = 0;
    mods.en_bull_speed = 0;
    mods.en_spawn_speed = 0;
    mods.en_doubles = 0;
    mods.en_pl_skin = 0;
    mods.pl_speed_dec = 0;
    mods.pl_en_tank = 0;
    mods.bul_ricochet = 0;
    mods.en_no_walls = 0;
    mods.pvp_kills = 0;
    mods.no_bonuses = 0;

    mods.en_on_map_inc = 0;
    config.max_enemies_on_map = MAX_ENEMIES;
    config.units_on_map = config.max_enemies_on_map + 2;
    config.max_explode = config.units_on_map << 1;
    config.max_bullets = config.units_on_map << 1;

    mods.en_shielded = 0;
    mods.pl_shieldless = 0;
    mods.pl_asskiller = 0;
    mods.en_invul = 0;

    u8 i;
    u16 mod_indexes[MAX_MODS];
    for (i = 0; i < MAX_MODS; i++) {
        mod_indexes[i] = i;
    }
    shuffle_u16(mod_indexes, MAX_MODS);
    for (i = 0; i < config.mods_count; i++) {
        text[i] = mods_text[mod_indexes[i]];
        switch (mod_indexes[i]) {
            case  0: mods.en_speed = 1;       break;
            case  1: mods.en_armor = 1;       break;
            case  2: mods.en_uranium = 1;     break;
            case  3: mods.en_bull_speed = 1;  break;
            case  4: mods.en_spawn_speed = 1; break;
            case  5: mods.en_doubles = 1;     break;
            case  6: mods.en_pl_skin = 1;     break;
            case  7: mods.pl_speed_dec = 1;   break;
            case  8: mods.pl_en_tank = 1;     break;
            case  9: mods.bul_ricochet = 1;   break;
            case 10: mods.en_no_walls = 1;    break;
            case 11: mods.pvp_kills = 1;      break;
            case 12: mods.no_bonuses = 1;     break;
            case 13: mods.en_on_map_inc = 1;
                config.max_enemies_on_map = MAX_ENEMIES + 2;
                config.units_on_map = config.max_enemies_on_map + 2;
                config.max_explode = config.units_on_map << 1;
                config.max_bullets = config.units_on_map << 1;
                break;
            case 14: mods.en_shielded = 1;    break;
            case 15: mods.pl_shieldless = 1;  break;
            case 16: mods.pl_asskiller = 1;   break;
            case 17: mods.en_invul = 1;       break;
        }
    }
}