input.c

   1 /*
   2    Cantaveria - action adventure platform game
   3    Copyright (C) 2009 2010 Evan Rinehart
   4
   5    This program is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU General Public License
   7    as published by the Free Software Foundation; either version 2
   8    of the License, or (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to
  17
  18    The Free Software Foundation, Inc.
  19    51 Franklin Street, Fifth Floor
  20    Boston, MA  02110-1301, USA
  21
  22    evanrinehart@gmail.com
  23 */
  24 #include <SDL/SDL.h>
  25
  26
  27 #include <util.h>
  28 #include <input.h>
  29
  30 #define JOY_MAX 32767
  31 #define JOY_MIN -32768
  32 #define JOY_THRESH 1000
  33
  34 static input NoInput = {NO_INPUT, INVALID_BUTTON, 0};
  35 static input SkipInput = {SKIP_INPUT, INVALID_BUTTON, 0};
  36 static input EndOfProgram = {END_OF_PROGRAM, INVALID_BUTTON, 0};
  37
  38 static SDL_Event last_event;
  39
  40 /* controller mappings */
  41 struct key_map {
  42         SDLKey sym;
  43
  44         int player;
  45         enum input_button button;
  46
  47         struct key_map* next;
  48 };
  49 struct key_map* key_maps = NULL;
  50
  51
  52 struct axis_map {
  53         Uint8 joystick;
  54         Uint8 axis;
  55         Sint16 last_value;
  56
  57         int player;
  58         enum input_button button[2];
  59
  60         struct axis_map* next;
  61 };
  62 struct axis_map* axis_maps = NULL;
  63
  64 struct jbutton_map {
  65         Uint8 joystick;
  66         Uint8 jbutton;
  67
  68         int player;
  69         enum input_button button;
  70
  71         struct jbutton_map* next;
  72 };
  73 struct jbutton_map* jbutton_maps = NULL;
  74
  75
  76 struct key_map* kmfind(SDLKey sym){
  77         struct key_map* ptr = key_maps;
  78         while(ptr){
  79                 if(ptr->sym == sym)
  80                         return ptr;
  81                 else
  82                         ptr = ptr->next;
  83         }
  84         return NULL;
  85 }
  86
  87 struct axis_map* amfind(Uint8 joystick, Uint8 axis){
  88         struct axis_map* ptr = axis_maps;
  89         while(ptr){
  90                 if(ptr->joystick == joystick && ptr->axis == axis)
  91                         return ptr;
  92                 else
  93                         ptr = ptr->next;
  94         }
  95         return NULL;
  96 }
  97
  98 struct jbutton_map* jmfind(Uint8 joystick, Uint8 jbutton){
  99         struct jbutton_map* ptr = jbutton_maps;
 100         while(ptr){
 101                 if(ptr->joystick == joystick && ptr->jbutton == jbutton)
 102                         return ptr;
 103                 else
 104                         ptr = ptr->next;
 105         }
 106         return NULL;
 107 }
 108
 109
 110
 111 enum input_type kmtype(Uint8 type){
 112         switch(type){
 113         case SDL_KEYDOWN: return BUTTON_PRESS;
 114         case SDL_KEYUP: return BUTTON_RELEASE;
 115         default:
 116                 report_error("input map_key: invalid SDL event type\n");
 117                 return INVALID_INPUT;
 118         }
 119 }
 120
 121 enum input_type jmtype(Uint8 type){
 122         switch(type){
 123         case SDL_JOYBUTTONDOWN: return BUTTON_PRESS;
 124         case SDL_JOYBUTTONUP: return BUTTON_RELEASE;
 125         default:
 126                 report_error("input map_jbutton: invalid SDL event type\n");
 127                 return INVALID_INPUT;
 128         }
 129 }
 130
 131 enum input_button ambutton(int state, struct axis_map* am){
 132         switch(state){
 133         case -1: return am->button[0];
 134         case 1: return am->button[1];
 135         case 0:
 136                 report_error("input axis_motion: axis state 0 does not imply a button\n");
 137                 return INVALID_BUTTON;
 138         default:
 139                 report_error("input axis_motion: invalid axis state (%d)\n", state);
 140                 return INVALID_BUTTON;
 141         }
 142 }
 143
 144 input map_key(SDL_Event* e){
 145         SDLKey sym = e->key.keysym.sym;
 146         struct key_map* km = kmfind(sym);
 147         input in;
 148         if(km){
 149                 in.type = kmtype(e->type);
 150                 in.player = km->player;
 151                 in.button = km->button;
 152                 return in;
 153         }
 154         else{
 155                 in.type = kmtype(e->type);
 156                 in.player = 0;
 157                 in.button = NONDESCRIPT_BUTTON;
 158                 return in;
 159         }
 160 }
 161
 162 input map_jbutton(SDL_Event* e){
 163         Uint8 which = e->jbutton.which;
 164         Uint8 jbutton = e->jbutton.button;
 165         struct jbutton_map* jm = jmfind(which, jbutton);
 166         input in;
 167
 168         if(jm){
 169                 in.type = jmtype(e->type);
 170                 in.player = jm->player;
 171                 in.button = jm->button;
 172                 return in;
 173         }
 174         else{
 175                 in.type = jmtype(e->type);
 176                 in.player = 0;
 177                 in.button = NONDESCRIPT_BUTTON;
 178                 return in;
 179         }
 180 }
 181
 182 int axis_state(Sint16 x){
 183         if(x < -JOY_THRESH) return -1;
 184         else if(x > JOY_THRESH) return 1;
 185         else return 0;
 186 }
 187
 188 input axis_motion(Sint16 value, struct axis_map* am){
 189         int state0 = axis_state(am->last_value);
 190         int state1 = axis_state(value);
 191         int diff = state1 - state0;
 192         input in;
 193
 194         if(abs(diff) == 2){
 195                 /*stuck FIXME ?
 196                 set a flag in the am which tells get_input
 197                 to do a button press
 198                 note that without this fix, it wont get stuck,
 199                 the input system will just be slightly inconsistent*/
 200                 report_error("input axis_motion: (FIXME) joystick almost got stuck\n");
 201         }
 202
 203         if(diff == 0){
 204                 return SkipInput;
 205         }
 206         else if(state0 != 0){
 207                 in.type = BUTTON_RELEASE;
 208                 in.player = am->player;
 209                 in.button = ambutton(state0, am);
 210                 return in;
 211         }
 212         else{ /*(state1 != 0)*/
 213                 in.type = BUTTON_PRESS;
 214                 in.player = am->player;
 215                 in.button = ambutton(state1, am);
 216                 return in;
 217         }
 218 }
 219
 220 input map_jaxis(SDL_Event* e){
 221         Uint8 which = e->jaxis.which;
 222         Uint8 axis = e->jaxis.axis;
 223         Sint16 value = e->jaxis.value;
 224         struct axis_map* am = amfind(which, axis);
 225         if(am){
 226                 return axis_motion(value, am);
 227         }
 228         else{
 229                 return SkipInput;
 230         }
 231 }
 232
 233
 234
 235 void kmadd(int player, enum input_button button, SDLKey sym){
 236         struct key_map* km = malloc(sizeof(struct key_map));
 237         struct key_map* ptr = key_maps;;
 238         km->player = player;
 239         km->button = button;
 240         km->sym = sym;
 241         km->next = NULL;
 242
 243         if(!ptr){
 244                 key_maps = km;
 245                 return;
 246         }
 247
 248         while(ptr->next) ptr = ptr->next;
 249
 250         ptr->next = km;
 251 }
 252
 253
 254 /* *** */
 255 input get_input(){
 256         SDL_Event e;
 257         input in;
 258
 259         while(SDL_PollEvent(&e) != 0){
 260                 last_event = e;
 261                 switch(e.type){
 262                         case SDL_KEYDOWN:
 263                         case SDL_KEYUP:
 264                                 return map_key(&e);
 265
 266                         case SDL_JOYBUTTONDOWN:
 267                         case SDL_JOYBUTTONUP:
 268                                 return map_jbutton(&e);
 269
 270                         case SDL_JOYAXISMOTION:
 271                                 in = map_jaxis(&e);
 272                                 if(in.type == SKIP_INPUT)
 273                                         return in;
 274                                 else
 275                                         break;
 276
 277                         case SDL_QUIT:
 278                                 return EndOfProgram;
 279                 }
 280         }
 281
 282         return NoInput;
 283 }
 284
 285
 286 void remap_last_input(enum input_button button, int player){
 287         SDL_Event e = last_event;
 288         switch(e.type){
 289                 case SDL_KEYDOWN:
 290                 case SDL_KEYUP:
 291                         kmadd(player, button, e.key.keysym.sym);
 292                         break;
 293                 case SDL_JOYBUTTONDOWN:
 294                 case SDL_JOYBUTTONUP:
 295                         //jmadd(player, button, e.jbutton.button);
 296                         break;
 297                 case SDL_JOYAXISMOTION:
 298                         //amadd...
 299                         break;
 300         }
 301 }
 302
 303
 304
 305 void input_init(const char* filename){
 306         /* set up mappings */
 307         // A -> Left
 308         // D -> Right
 309         // W -> Up
 310         kmadd(0, LEFT_BUTTON, SDLK_a);
 311         kmadd(0, RIGHT_BUTTON, SDLK_d);
 312         kmadd(0, UP_BUTTON, SDLK_w);
 313         kmadd(0, DOWN_BUTTON, SDLK_s);
 314
 315         kmadd(0, JUMP_BUTTON, SDLK_k);
 316         kmadd(0, FIRE_BUTTON, SDLK_j);
 317         kmadd(0, INVENTORY_BUTTON, SDLK_i);
 318         kmadd(0, SPECIAL_BUTTON, SDLK_l);
 319
 320         kmadd(0, L_BUTTON, SDLK_u);
 321         kmadd(0, R_BUTTON, SDLK_o);
 322
 323         kmadd(0, START_BUTTON, SDLK_q);
 324         kmadd(0, SELECT_BUTTON, SDLK_e);
 325
 326         kmadd(0, ESCAPE_KEY, SDLK_ESCAPE);
 327         kmadd(0, PAUSE_KEY, SDLK_PAUSE);
 328 }
 329
 330 void save_input(const char* filename){
 331
 332 }
 333
 334
 335 const char* input_str(input in){
 336         switch(in.button){
 337                 case START_BUTTON: return "START";
 338                 case SELECT_BUTTON: return "SELECT";
 339                 case L_BUTTON: return "L";
 340                 case R_BUTTON: return "R";
 341
 342                 case LEFT_BUTTON: return "LEFT";
 343                 case RIGHT_BUTTON: return "RIGHT";
 344                 case UP_BUTTON: return "UP";
 345                 case DOWN_BUTTON: return "DOWN";
 346
 347                 case FIRE_BUTTON: return "FIRE";
 348                 case JUMP_BUTTON: return "JUMP";
 349                 case INVENTORY_BUTTON: return "INVENTORY";
 350                 case SPECIAL_BUTTON: return "SPECIAL";
 351
 352                 case ESCAPE_KEY: return "ESCAPE";
 353                 case PAUSE_KEY: return "PAUSE";
 354                 case INVALID_BUTTON: return "INVALID";
 355                 case NONDESCRIPT_BUTTON: return "NONDESCRIPT";
 356                 default: return "ERROR";
 357         }
 358 }
 359