src/game/level/player.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3
   4 #include <SDL.h>
   5
   6 #include "game/level/explosion.h"
   7 #include "game/level/script.h"
   8 #include "game/level/rigid_bodies.h"
   9 #include "goals.h"
  10 #include "math/point.h"
  11 #include "platforms.h"
  12 #include "player.h"
  13 #include "system/line_stream.h"
  14 #include "system/log.h"
  15 #include "system/lt.h"
  16 #include "system/nth_alloc.h"
  17 #include "system/stacktrace.h"
  18
  19 #define PLAYER_WIDTH 25.0f
  20 #define PLAYER_HEIGHT 25.0f
  21 #define PLAYER_SPEED 500.0f
  22 #define PLAYER_JUMP 32000.0f
  23 #define PLAYER_DEATH_DURATION 0.75f
  24 #define PLAYER_MAX_JUMP_THRESHOLD 2
  25
  26 typedef enum Player_state {
  27     PLAYER_STATE_ALIVE = 0,
  28     PLAYER_STATE_DYING
  29 } Player_state;
  30
  31 struct Player {
  32     Lt *lt;
  33     Player_state state;
  34
  35     RigidBodies *rigid_bodies;
  36
  37     RigidBodyId alive_body_id;
  38     Explosion *dying_body;
  39     Script *script;
  40
  41     int jump_threshold;
  42     Color color;
  43
  44     Vec checkpoint;
  45
  46     int play_die_cue;
  47 };
  48
  49 Player *create_player_from_player_layer(const PlayerLayer *player_layer,
  50                                         RigidBodies *rigid_bodies,
  51                                         Broadcast *broadcast)
  52 {
  53     trace_assert(player_layer);
  54     trace_assert(rigid_bodies);
  55     trace_assert(broadcast);
  56
  57     Lt *lt = create_lt();
  58
  59
  60     Player *player = PUSH_LT(lt, nth_calloc(1, sizeof(Player)), free);
  61     if (player == NULL) {
  62         RETURN_LT(lt, NULL);
  63     }
  64     player->lt = lt;
  65
  66     player->rigid_bodies = rigid_bodies;
  67
  68     player->script = PUSH_LT(
  69         lt,
  70         create_script_from_string(broadcast, player_layer->source_code),
  71         destroy_script);
  72     if (player->script == NULL) {
  73         RETURN_LT(lt, NULL);
  74     }
  75
  76     player->alive_body_id = rigid_bodies_add(
  77         rigid_bodies,
  78         rect(
  79             player_layer->position.x,
  80             player_layer->position.y,
  81             PLAYER_WIDTH,
  82             PLAYER_HEIGHT));
  83
  84     player->dying_body = PUSH_LT(
  85         lt,
  86         create_explosion(
  87             player_layer->color_picker.color,
  88             PLAYER_DEATH_DURATION),
  89         destroy_explosion);
  90     if (player->dying_body == NULL) {
  91         RETURN_LT(lt, NULL);
  92     }
  93
  94     player->jump_threshold = 0;
  95     player->color = player_layer->color_picker.color;
  96     player->checkpoint = player_layer->position;
  97     player->play_die_cue = 0;
  98     player->state = PLAYER_STATE_ALIVE;
  99
 100     return player;
 101 }
 102
 103 void destroy_player(Player * player)
 104 {
 105     RETURN_LT0(player->lt);
 106 }
 107
 108 int player_render(const Player * player,
 109                   Camera *camera)
 110 {
 111     trace_assert(player);
 112     trace_assert(camera);
 113
 114     char debug_text[256];
 115
 116     switch (player->state) {
 117     case PLAYER_STATE_ALIVE: {
 118         snprintf(debug_text, 256, "Jump: %d", player->jump_threshold);
 119         Rect hitbox = rigid_bodies_hitbox(player->rigid_bodies, player->alive_body_id);
 120
 121         if (camera_render_debug_text(camera, debug_text, vec(hitbox.x, hitbox.y - 20.0f)) < 0) {
 122             return -1;
 123         }
 124
 125         return rigid_bodies_render(
 126             player->rigid_bodies,
 127             player->alive_body_id,
 128             player->color,
 129             camera);
 130     }
 131
 132     case PLAYER_STATE_DYING:
 133         return explosion_render(player->dying_body, camera);
 134
 135     default: {}
 136     }
 137
 138     return 0;
 139 }
 140
 141 void player_update(Player *player,
 142                    float delta_time)
 143 {
 144     trace_assert(player);
 145
 146     switch (player->state) {
 147     case PLAYER_STATE_ALIVE: {
 148         rigid_bodies_update(player->rigid_bodies, player->alive_body_id, delta_time);
 149
 150         const Rect hitbox = rigid_bodies_hitbox(player->rigid_bodies, player->alive_body_id);
 151
 152
 153         if (hitbox.y > 1000.0f) {
 154             player_die(player);
 155         }
 156     } break;
 157
 158     case PLAYER_STATE_DYING: {
 159         explosion_update(player->dying_body, delta_time);
 160
 161         if (explosion_is_done(player->dying_body)) {
 162             rigid_bodies_disable(player->rigid_bodies, player->alive_body_id, false);
 163             rigid_bodies_transform_velocity(
 164                 player->rigid_bodies,
 165                 player->alive_body_id,
 166                 make_mat3x3(0.0f, 0.0f, 0.0f,
 167                             0.0f, 0.0f, 0.0f,
 168                             0.0f, 0.0f, 1.0f));
 169             rigid_bodies_teleport_to(
 170                 player->rigid_bodies,
 171                 player->alive_body_id,
 172                 player->checkpoint);
 173             player->state = PLAYER_STATE_ALIVE;
 174         }
 175     } break;
 176
 177     default: {}
 178     }
 179 }
 180
 181 void player_move_left(Player *player)
 182 {
 183     trace_assert(player);
 184     rigid_bodies_move(player->rigid_bodies, player->alive_body_id, vec(-PLAYER_SPEED, 0.0f));
 185 }
 186
 187 void player_move_right(Player *player)
 188 {
 189     trace_assert(player);
 190
 191     rigid_bodies_move(player->rigid_bodies, player->alive_body_id, vec(PLAYER_SPEED, 0.0f));
 192 }
 193
 194 void player_stop(Player *player)
 195 {
 196     trace_assert(player);
 197
 198     rigid_bodies_move(player->rigid_bodies, player->alive_body_id, vec(0.0f, 0.0f));
 199 }
 200
 201 void player_jump(Player *player)
 202 {
 203     trace_assert(player);
 204
 205     if (rigid_bodies_touches_ground(player->rigid_bodies, player->alive_body_id)) {
 206         player->jump_threshold = 0;
 207     }
 208
 209     if (player->jump_threshold < PLAYER_MAX_JUMP_THRESHOLD) {
 210         rigid_bodies_transform_velocity(
 211             player->rigid_bodies,
 212             player->alive_body_id,
 213             make_mat3x3(1.0f, 0.0f, 0.0f,
 214                         0.0f, 0.0f, 0.0f,
 215                         0.0f, 0.0f, 1.0f));
 216         rigid_bodies_apply_force(
 217             player->rigid_bodies,
 218             player->alive_body_id,
 219             vec(0.0f, -PLAYER_JUMP));
 220         player->jump_threshold++;
 221
 222         if (script_has_scope_value(player->script, "on-jump")) {
 223             script_eval(player->script, "(on-jump)");
 224         }
 225     }
 226 }
 227
 228 void player_die(Player *player)
 229 {
 230     trace_assert(player);
 231
 232     if (player->state == PLAYER_STATE_ALIVE) {
 233         const Rect hitbox =
 234             rigid_bodies_hitbox(
 235                 player->rigid_bodies,
 236                 player->alive_body_id);
 237
 238         player->play_die_cue = 1;
 239         explosion_start(player->dying_body, vec(hitbox.x, hitbox.y));
 240         player->state = PLAYER_STATE_DYING;
 241         rigid_bodies_disable(player->rigid_bodies, player->alive_body_id, true);
 242     }
 243 }
 244
 245 void player_focus_camera(Player *player,
 246                          Camera *camera)
 247 {
 248     trace_assert(player);
 249     trace_assert(camera);
 250
 251     const Rect player_hitbox = rigid_bodies_hitbox(
 252         player->rigid_bodies,
 253         player->alive_body_id);
 254
 255     camera_center_at(
 256         camera,
 257         vec_sum(
 258             vec(player_hitbox.x, player_hitbox.y),
 259             vec(0.0f, -player_hitbox.h * 0.5f)));
 260 }
 261
 262 void player_hide_goals(const Player *player,
 263                        Goals *goals)
 264 {
 265     trace_assert(player);
 266     trace_assert(goals);
 267     goals_hide_from_player(
 268         goals,
 269         rigid_bodies_hitbox(
 270             player->rigid_bodies,
 271             player->alive_body_id));
 272 }
 273
 274 void player_die_from_lava(Player *player,
 275                           const Lava *lava)
 276 {
 277     if (lava_overlaps_rect(
 278             lava,
 279             rigid_bodies_hitbox(
 280                 player->rigid_bodies,
 281                 player->alive_body_id))) {
 282         player_die(player);
 283     }
 284 }
 285
 286 void player_checkpoint(Player *player, Vec checkpoint)
 287 {
 288     player->checkpoint = checkpoint;
 289 }
 290
 291 int player_sound(Player *player,
 292                  Sound_samples *sound_samples)
 293 {
 294     if (player->play_die_cue) {
 295         player->play_die_cue = 0;
 296
 297         if (sound_samples_play_sound(sound_samples, 0) < 0) {
 298             return -1;
 299         }
 300     }
 301
 302     return 0;
 303 }
 304
 305 bool player_overlaps_rect(const Player *player,
 306                           Rect rect)
 307 {
 308     trace_assert(player);
 309
 310     return player->state == PLAYER_STATE_ALIVE
 311         && rects_overlap(
 312             rect, rigid_bodies_hitbox(
 313                 player->rigid_bodies,
 314                 player->alive_body_id));
 315 }
 316
 317 Rect player_hitbox(const Player *player)
 318 {
 319     return rigid_bodies_hitbox(
 320         player->rigid_bodies,
 321         player->alive_body_id);
 322 }