src/mercenary/main.c

   1 /* main routine
   2  *
   3  * (C) 2018 by Andreas Eversberg <jolly@eversberg.eu>
   4  * All Rights Reserved
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdint.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <math.h>
  25 #include <sys/stat.h>
  26 #include <sys/types.h>
  27 #include "../../include/keycodes.h"
  28 #include "../libsdl/sdl.h"
  29 #ifdef HAVE_OVR
  30 #include "../libovr/ovr.h"
  31 #include "../libovr/keyboard.h"
  32 #endif
  33 #include "../libopengl/opengl.h"
  34 #include "../libsdl/print.h"
  35 #include "../libcpu/m68k.h"
  36 #include "../libcpu/execute.h"
  37 #include "../libframerate/framerate.h"
  38 #include "../libvideo/video.h"
  39 #include "../libsound/sound.h"
  40 #include "../libjoystick/joystick.h"
  41 #include "../libkeyboard/keyboard.h"
  42 #include "../libdisk/disk.h"
  43 #include "../libtext/text.h"
  44 #include "mercenary.h"
  45 #include "render.h"
  46
  47 #define FOV_MIN         10.0
  48 #define FOV_NOVAGEN     64.0
  49 #define FOV_JOLLY       80.0
  50 #define FOV_MAX         170.0
  51
  52 #define STICK_WALK_THRESHOLD 0.3 /* move the stick until the player moves */
  53 #define STICK_ROTATE_THRESHOLD 0.3 /* move the stick until the player rotates */
  54 #define STICK_THRUST_THRESHOLD 0.1 /* move the stick until the craft moves */
  55
  56 static int config_ctrl_c = 0;
  57 static int config_amiga_speed = 0; /* fast speed */
  58 static double config_fps = 10.0;
  59 #if !defined(_WIN32)
  60 static const char *config_gamesave_dir = ".mercenary";
  61 #endif
  62 static int config_video_filter = 1;
  63 static int config_audio_filter = 1;
  64 static int config_render = 1; /* opengl render */
  65 static int config_skip_intro = 0;
  66 static int config_multisampling = 8;
  67 static int config_joystick = -1, config_joystick_x = -1, config_joystick_y = -1, config_joystick_fire = -1;
  68 #ifdef HAVE_OVR
  69 static double config_benson_size = 0.7;
  70 static double config_fov = FOV_JOLLY;
  71 #else
  72 static double config_benson_size = 1.0;
  73 static double config_fov = FOV_NOVAGEN;
  74 #endif
  75 static double config_monitor_distance = 41.5; /* inch */
  76 #ifdef HAVE_OVR
  77 static double config_keyboard_distance = 38.5; /* inch */
  78 static double config_keyboard_height = -26.0; /* inch */
  79 #endif
  80 static int config_debug_transparent = 0;
  81 static int config_debug_opengl = 0;
  82 /* render improvements */
  83 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  84 static int config_improve_smooth_planets = 1;   /* set to 1 to rotate planets smoothly */
  85 static int config_improve_stars_rotation = 1;   /* set to 1 to improve star rendering */
  86 static int config_improve_fix_sky_rotation = 0; /* set to 1 to fix sky rotation */
  87 static int config_improve_round_planets = 0;    /* set to 1 to make planets exactly round */
  88 static int config_improve_shadows = 0;  /* set to 1 to add shadows on the ground */
  89
  90 #define CPU_SPEED       7093790.0;
  91
  92 #define SOUND_SAMPLERATE 48000
  93 /* - game IRQ rate
  94  * - must be used for sound rendering chunk
  95  */
  96 #define IRQ_RATE        50
  97 /* numbe of buffer chunks to dejitter:
  98  * - SDL render interval
  99  * - sound rendering interval
 100  * - sound card interval
 101  * 4 should be minimum, if video rate is >=50 Hz
 102  */
 103 #define SOUND_CHUNKS    4
 104
 105 /* test sound to check if buffer does not overflow / underrun */
 106 //#define DEBUG_SOUND_BUFFERING
 107
 108 #define IOSIZE          0x1000 /* bytes in io space */
 109 #define MEMORY_SIZE     0x80000
 110 static uint8_t *memory = NULL;
 111 static uint8_t *stop_event = NULL;
 112 static uint8_t *image = NULL;
 113 static uint8_t *help_osd[3] = { NULL, NULL, NULL };
 114 static uint8_t *info_osd = NULL;
 115 static int help_view = 1;
 116 static int help_views = 0;
 117 static int32_t osd_timer = 0, border_timer = 0;
 118 #define SCREEN_WIDTH    (320*3)
 119 #define SCREEN_HEIGHT   (200*3)
 120 #define IMAGE_WIDTH     320
 121 #define IMAGE_HEIGHT    200
 122 #define BENSON_AT_LINE  136
 123 #define IMAGE_DIWSTART  0x2c
 124 #define HELP_ALPHA      0xd0
 125 #define OSD_WIDTH       320
 126 #define OSD_HEIGHT      16
 127 static uint16_t *chipreg = NULL;
 128 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 129 static int sound_buffer_size; /* buffer sample size */
 130 static int sound_buffer_writep; /* write pointer at buffer */
 131 static int sound_buffer_readp; /* read pointer at buffer */
 132 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 133 static double benson_size; /* render size of benson */
 134 static int render_legacy = 0; /* render original amiga screen, if set */
 135 static int render_improved = 0; /* render improved image, if set */
 136 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 137 static int intro_skipped = 0; /* indicated if we already have landed */
 138 static int window_width, window_height;
 139 static int mission_disk = 0;
 140
 141 static const char *home_dir;
 142
 143 static int quit = 0;
 144
 145 int parse_args(int argc, char *argv[])
 146 {
 147         int i = 1;
 148
 149         while (argc > i) {
 150                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 151                         /*          |                                                                             | */
 152                         print_info("Usage: %s\n", argv[0]);
 153                         print_info(" -s --render-speed original | fast\n");
 154                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 155                         print_info("    --fps <fps>\n");
 156                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 157                         print_info(" -v --video-filter on | off\n");
 158                         print_info("        Set video filter.\n");
 159                         print_info(" -a --audio-filter on | off\n");
 160                         print_info("        Set audio filter.\n");
 161                         print_info(" -r --render original | opengl\n");
 162                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 163                         print_info(" -b --benson normal | half\n");
 164                         print_info("        Size of 'Benson' (control panel).\n");
 165                         print_info(" -m --multisampling <samples>\n");
 166                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 167                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 168                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 169                         print_info(" -i --skip-intro\n");
 170                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 171                         print_info(" -j --joystick <num> | list\n");
 172                         print_info("        Select given joystick number or show list. (default = 0, if available)\n");
 173                         print_info("    --joystick-x <axis num>\n");
 174                         print_info("    --joystick-y <axis num>\n");
 175                         print_info("    --joystick-fire <button num>\n");
 176                         print_info("        Specify explicit axis and button of joystick.\n");
 177                         print_info("Improvement options:\n");
 178                         print_info("    --extend-roads 1 | 0\n");
 179                         print_info("        Roads in the distance end in a single point. This was ok for low\n");
 180                         print_info("        resolution, but for OpenGL we want equal width all the way.\n");
 181                         print_info("        This requires OpenGL rendering. (default = %d)\n", config_improve_extend_roads);
 182                         print_info("    --smooth-planets 1 | 0\n");
 183                         print_info("        Planet's rotation uses integer value, so they judder in the original\n");
 184                         print_info("        game rendering. This option requires OpenGL rendering. (default = %d)\n", config_improve_smooth_planets);
 185                         print_info("    --stars-rotation 1 | 0\n");
 186                         print_info("        Stars are rendered originally by using a fast routine. Use this option\n");
 187                         print_info("        to make them render on a sphere. They also rotate with the sky then.\n");
 188                         print_info("        This requires OpenGL rendering and is default with VR. (default = %d)\n", config_improve_stars_rotation);
 189                         print_info("    --fix-sky-rotation 1 | 0\n");
 190                         print_info("        Sky rotates in the wrong direction, if flying over planet. This is\n");
 191                         print_info("        fixed by rotating all sky object by 180 degrees. The original (wrong)\n");
 192                         print_info("        rotation is default, because it preserves the game's spirit!\n");
 193                         print_info("        This option requires OpenGL rendering. (default = %d)\n", config_improve_fix_sky_rotation);
 194                         print_info("    --round-planets 1 | 0\n");
 195                         print_info("        The original game renders planets and explosion debris horizontally\n");
 196                         print_info("        stretched. This compensates the vertical stretch of NTSC vs PAL video.\n");
 197                         print_info("        The original (stretched) sphere makes the game authentic.\n");
 198                         print_info("        This option requires OpenGL rendering. (default = %d)\n", config_improve_round_planets);
 199                         print_info("    --shadows 1 | 0\n");
 200                         print_info("        This will cast shadows on the ground and change the color of the sky,\n");
 201                         print_info("        depending on the elevation of the sun.\n");
 202                         print_info("        This option requires OpenGL rendering. (default = %d)\n", config_improve_shadows);
 203                         print_info("Debug options:\n");
 204                         print_info(" -o --debug-opengl\n");
 205                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 206                         print_info("    --debug-transparent\n");
 207                         print_info("        Draw all things half transparent.\n");
 208                         print_info("    --ctrl-c\n");
 209                         print_info("        Use CTRL+C to exit game (used for development)\n");
 210                         return -1;
 211                 } else
 212                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 213                         i++;
 214                         if (argc == i) {
 215 missing_parameter:
 216                                 print_info("Missing parameter, use '--help'!\n");
 217                                 return -1;
 218                         }
 219                         if (!strcmp(argv[i], "original"))
 220                                 config_amiga_speed = 1;
 221                         else
 222                         if (!strcmp(argv[i], "fast"))
 223                                 config_amiga_speed = 0;
 224                         else {
 225 illegal_parameter:
 226                                 print_info("Illegal parameter, use '--help'!\n");
 227                                 return -1;
 228                         }
 229                 } else
 230                 if (!strcmp(argv[i], "--fps")) {
 231                         i++;
 232                         if (argc == i)
 233                                 goto missing_parameter;
 234                         config_fps = atof(argv[i]);
 235                         if (config_fov <= 0.0)
 236                                 goto illegal_parameter;
 237                 } else
 238                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 239                         i++;
 240                         if (argc == i)
 241                                 goto missing_parameter;
 242                         if (!strcmp(argv[i], "on"))
 243                                 config_video_filter = 1;
 244                         else
 245                         if (!strcmp(argv[i], "off"))
 246                                 config_video_filter = 0;
 247                         else
 248                                 goto illegal_parameter;
 249                 } else
 250                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 251                         i++;
 252                         if (argc == i)
 253                                 goto missing_parameter;
 254                         if (!strcmp(argv[i], "on"))
 255                                 config_audio_filter = 1;
 256                         else
 257                         if (!strcmp(argv[i], "off"))
 258                                 config_audio_filter = 0;
 259                         else
 260                                 goto illegal_parameter;
 261                 } else
 262                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 263                         i++;
 264                         if (argc == i)
 265                                 goto missing_parameter;
 266                         if (!strcmp(argv[i], "original"))
 267                                 config_render = 0;
 268                         else
 269                         if (!strcmp(argv[i], "opengl"))
 270                                 config_render = 1;
 271                         else
 272                                 goto illegal_parameter;
 273                 } else
 274                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 275                         i++;
 276                         if (argc == i)
 277                                 goto missing_parameter;
 278                         if (!strcmp(argv[i], "normal"))
 279                                 config_benson_size = 1.0;
 280                         else
 281                         if (!strcmp(argv[i], "half")) {
 282                                 config_benson_size = 0.5;
 283                                 if (config_fov == FOV_NOVAGEN)
 284                                         config_fov = FOV_JOLLY;
 285                         } else
 286                                 goto illegal_parameter;
 287                 } else
 288                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 289                         i++;
 290                         if (argc == i)
 291                                 goto missing_parameter;
 292                         config_multisampling = atoi(argv[i]);
 293                 } else
 294                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 295                         i++;
 296                         if (argc == i)
 297                                 goto missing_parameter;
 298                         config_fov = atof(argv[i]);
 299                         if (config_fov < 1.0 || config_fov > 179.0)
 300                                 goto illegal_parameter;
 301                 } else
 302                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 303                         config_skip_intro = 1;
 304                 } else
 305                 if (!strcmp(argv[i], "-j") || !strcmp(argv[i], "--joystick")) {
 306                         i++;
 307                         if (argc == i)
 308                                 goto missing_parameter;
 309                         if (!strcmp(argv[i], "list")) {
 310                                 sdl_list_joysticks();
 311                                 return 1;
 312                         }
 313                         config_joystick = atoi(argv[i]);
 314                 } else
 315                 if (!strcmp(argv[i], "--joystick-x")) {
 316                         i++;
 317                         if (argc == i)
 318                                 goto missing_parameter;
 319                         config_joystick_x = atoi(argv[i]);
 320                 } else
 321                 if (!strcmp(argv[i], "--joystick-y")) {
 322                         i++;
 323                         if (argc == i)
 324                                 goto missing_parameter;
 325                         config_joystick_y = atoi(argv[i]);
 326                 } else
 327                 if (!strcmp(argv[i], "--joystick-fire")) {
 328                         i++;
 329                         if (argc == i)
 330                                 goto missing_parameter;
 331                         config_joystick_fire = atoi(argv[i]);
 332                 } else
 333                 if (!strcmp(argv[i], "--extend-roads")) {
 334                         i++;
 335                         if (argc == i)
 336                                 goto missing_parameter;
 337                         config_improve_extend_roads = atoi(argv[i]);
 338                 } else
 339                 if (!strcmp(argv[i], "--smooth-planets")) {
 340                         i++;
 341                         if (argc == i)
 342                                 goto missing_parameter;
 343                         config_improve_smooth_planets = atoi(argv[i]);
 344                 } else
 345                 if (!strcmp(argv[i], "--stars-rotation")) {
 346                         i++;
 347                         if (argc == i)
 348                                 goto missing_parameter;
 349                         config_improve_stars_rotation = atoi(argv[i]);
 350                 } else
 351                 if (!strcmp(argv[i], "--fix-sky-rotation")) {
 352                         i++;
 353                         if (argc == i)
 354                                 goto missing_parameter;
 355                         config_improve_fix_sky_rotation = atoi(argv[i]);
 356                 } else
 357                 if (!strcmp(argv[i], "--round-planets")) {
 358                         i++;
 359                         if (argc == i)
 360                                 goto missing_parameter;
 361                         config_improve_round_planets = atoi(argv[i]);
 362                 } else
 363                 if (!strcmp(argv[i], "--shadows")) {
 364                         i++;
 365                         if (argc == i)
 366                                 goto missing_parameter;
 367                         config_improve_shadows = atoi(argv[i]);
 368                 } else
 369                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 370                         config_debug_opengl = 1;
 371                 } else
 372                 if (!strcmp(argv[i], "--debug-transparent")) {
 373                         config_debug_transparent = 1;
 374                 } else
 375                 if (!strcmp(argv[i], "--ctrl-c")) {
 376                         config_ctrl_c = 1;
 377                 } else {
 378                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 379                         return -1;
 380                 }
 381                 i++;
 382         }
 383
 384         return 0;
 385 }
 386
 387 static void osd_info(const char *param, const char *value)
 388 {
 389         char line[41] = "                                        ";
 390
 391         if (param[0]) {
 392                 strncpy(line + 21 - strlen(param), param, strlen(param));
 393                 line[22] = ':';
 394         }
 395         if (strlen(value) > 15) {
 396                 print_error("string too long\n");
 397                 return;
 398         }
 399         strncpy(line + 25, value, strlen(value));
 400         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 401         osd_timer = ticks_sdl() + 2500;
 402 }
 403
 404 static void toggle_help(void)
 405 {
 406         if (help_view == 0)
 407                 help_view = 2;
 408         else
 409         if (help_view == help_views)
 410                 help_view = 0;
 411         else
 412                 help_view++;
 413 }
 414
 415 static void resize_window(int width, int height)
 416 {
 417         window_width = width;
 418         window_height = height;
 419         border_timer = ticks_sdl() + 1500;
 420         osd_info("", "window resized");
 421 }
 422
 423 #ifdef HAVE_OVR
 424 static int __attribute__((unused)) button_a_last = 0, button_b_last = 0, button_x_last = 0, button_y_last = 0, button_menu_last = 0, button_left_trigger_last = 0, button_right_trigger_last = 0, button_left_thumb_last = 0, button_right_thumb_last = 0;
 425 static double __attribute__((unused)) stick_left_x_last = 0.0, stick_left_y_last = 0.0, stick_right_x_last = 0.0, stick_right_y_last = 0.0;
 426 static int thrust_last = 0;
 427 static int joystick_set_x_last = 0, joystick_set_y_last = 0;
 428 static int keyboard_on = 0;
 429 static enum keycode vr_key_pressed = 0, vr_key = 0;
 430 static int we_walk = 0, we_rotate = 0;
 431 static double degrees45 = 45.0 / 180.0 * M_PI;
 432
 433 static void handle_vr_poses(void)
 434 {
 435         int button_a = 0, button_b = 0, button_x = 0, button_y = 0, button_menu = 0, button_left_trigger = 0, button_right_trigger = 0, button_left_thumb = 0, button_right_thumb = 0;
 436         double hand_right_x = 0.0, hand_right_y = 0.0, hand_right_z = 0.0;
 437         double hand_right_yaw = 0.0, hand_right_pitch = 0.0, hand_right_roll = 0.0;
 438         double head_yaw = 0.0, head_pitch = 0.0, head_roll = 0.0;
 439         double stick_left_x = 0.0, stick_left_y = 0.0, stick_right_x = 0.0, stick_right_y = 0.0;
 440         int thrust = thrust_last;
 441         int joystick_set_x = 0, joystick_set_y = 0;
 442         static uint32_t current_time, last_time = 0, diff;
 443         static double increment, inc_count = 0.0;
 444
 445         /* handle input */
 446         get_poses_ovr(&button_a, &button_b, &button_x, &button_y, &button_menu, &button_left_trigger, &button_right_trigger, &button_left_thumb, &button_right_thumb, &hand_right_x, &hand_right_y, &hand_right_z, &hand_right_yaw, &hand_right_pitch, &hand_right_roll, &stick_left_x, &stick_left_y, &stick_right_x, &stick_right_y, &head_yaw, &head_pitch, &head_roll);
 447         if (button_a && !button_a_last) {
 448                 /* menu toggle */
 449                 toggle_help();
 450         }
 451         if (button_b && !button_b_last) {
 452                 /* reset observer */
 453                 reset_observer_ovr();
 454                 osd_info("", "reset observer");
 455         }
 456         if (button_x && !button_x_last) {
 457                 /* menu toggle */
 458                 toggle_help();
 459         }
 460         if (button_y && !button_y_last) {
 461                 /* reset observer */
 462                 reset_observer_ovr();
 463                 osd_info("", "reset observer");
 464         }
 465         if (!help_view) {
 466                 if (button_right_trigger && !button_right_trigger_last) {
 467                         /* trigger pressed */
 468                         if (keyboard_on) {
 469                                 if (vr_key) {
 470                                         vr_key_pressed = vr_key;
 471                                         set_amiga_key(vr_key_pressed, 1);
 472                                         /* reset vr thrust */
 473                                         thrust = 0;
 474                                 }
 475                         } else {
 476                                 /* fire button */
 477                                 set_joystick(-1, -1, -1, -1, 1);
 478                         }
 479                 }
 480                 if (!button_right_trigger && button_right_trigger_last) {
 481                         /* trigger released */
 482                         set_joystick(-1, -1, -1, -1, 0);
 483                         if (vr_key_pressed) {
 484                                 set_amiga_key(vr_key_pressed, 0);
 485                                 vr_key_pressed = 0;
 486                         }
 487                 }
 488                 /* joystick */
 489                 /* reset moving state, so the game is not influenced before we want to */
 490                 mercenary_vr_move(0, NULL, NULL, 256, 256);
 491                 joystick_set_x = 0;
 492                 joystick_set_y = 0;
 493                 if (!mercenary_get_info_walking()) {
 494                         /* turn right and left when not walking */
 495                         if (stick_right_x > STICK_ROTATE_THRESHOLD) {
 496                                 set_joystick(0, 1, -1, -1, -1);
 497                                 joystick_set_x = 1;
 498                         } else
 499                         if (stick_right_x < -STICK_ROTATE_THRESHOLD) {
 500                                 set_joystick(1, 0, -1, -1, -1);
 501                                 joystick_set_x = 1;
 502                         }
 503                         /* pitch craft */
 504                         if (stick_right_y > STICK_WALK_THRESHOLD) {
 505                                 set_joystick(-1, -1, 1, 0, -1);
 506                                 joystick_set_y = 1;
 507                         } else
 508                         if (stick_right_y < -STICK_WALK_THRESHOLD) {
 509                                 set_joystick(-1, -1, 0, 1, -1);
 510                                 joystick_set_y = 1;
 511                         }
 512                         if (joystick_set_x || joystick_set_y) {
 513                                 mercenary_vr_move(0, NULL, NULL,
 514                                         256,
 515                                         (int)(256.0 * fabs(stick_right_y) - STICK_WALK_THRESHOLD / (1.0 - STICK_WALK_THRESHOLD) + 0.5));
 516                         }
 517                 } else {
 518                         double roll, pitch, yaw;
 519                         double tilt, dir, east, north;
 520                         int32_t move_east[4], move_north[4];
 521
 522                         tilt = sqrt(stick_right_x * stick_right_x + stick_right_y * stick_right_y);
 523
 524                         /* check if we rotate, walk or rest */
 525                         if (we_rotate == 0 && we_walk == 0) {
 526                                 /* we rest */
 527                                 if (fabs(stick_right_y) > fabs(stick_right_x) && tilt > STICK_WALK_THRESHOLD)
 528                                         we_walk = 1;
 529                                 if (fabs(stick_right_x) > fabs(stick_right_y) && tilt > STICK_ROTATE_THRESHOLD)
 530                                         we_rotate = 1;
 531                         } else if (we_walk) {
 532                                 /* we walk */
 533                                 if (tilt < STICK_WALK_THRESHOLD) {
 534                                         we_walk = 0;
 535                                         /* we need to stop right here and not continue until next rendering */
 536                                         set_joystick(-1, -1, 0, 0, -1); /* stop y */
 537                                         reset_joystick(); /* commit stop */
 538                                 }
 539                         } else {
 540                                 /* we rotate */
 541                                 if (tilt < STICK_ROTATE_THRESHOLD)
 542                                         we_rotate = 0;
 543                         }
 544
 545                         /* if we walk */
 546                         if (we_walk) {
 547                                 /* get stick amplitude (dist) and direction (dir) */
 548                                 if (tilt > 1.0)
 549                                         tilt = 1.0;
 550                                 tilt = (tilt - STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 551                                 dir = atan2(stick_right_x, stick_right_y);
 552 #if 0
 553                                 /* use hand direction to get actual stick direction */
 554                                 dir = fmod(dir - hand_right_yaw, M_PI * 2.0);
 555                                 if (dir < -M_PI)
 556                                         dir += M_PI * 2.0;
 557                                 if (dir > M_PI)
 558                                         dir -= M_PI * 2.0;
 559 #endif
 560                                 /* flip direction, if we walk backwards */
 561                                 if (dir > M_PI / 2.0 || dir < -M_PI / 2.0) {
 562                                         /* go backwards */
 563                                         set_joystick(-1, -1, 0, 1, -1);
 564                                         joystick_set_y = 1;
 565                                 } else {
 566                                         /* go forward */
 567                                         set_joystick(-1, -1, 1, 0, -1);
 568                                         joystick_set_y = 1;
 569                                 }
 570                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 571                                 east = sin(yaw - dir + M_PI) * tilt;
 572                                 north = -cos(yaw - dir + M_PI) * tilt;
 573                                 /* calculatate the integer positions of 4 steps */
 574                                 move_east[0] = (int32_t)((east * 0.25) + 0.5);
 575                                 move_north[0] = (int32_t)((north * 0.25) + 0.5);
 576                                 move_east[1] = (int32_t)((east * 0.5) + 0.5);
 577                                 move_north[1] = (int32_t)((north * 0.5) + 0.5);
 578                                 move_east[2] = (int32_t)((east * 0.75) + 0.5);
 579                                 move_north[2] = (int32_t)((north * 0.75) + 0.5);
 580                                 move_east[3] = (int32_t)(east + 0.5);
 581                                 move_north[3] = (int32_t)(north + 0.5);
 582                                 /* calculate the delta between each of the 4 step */
 583                                 move_east[3] -= move_east[2];
 584                                 move_north[3] -= move_north[2];
 585                                 move_east[2] -= move_east[1];
 586                                 move_north[2] -= move_north[1];
 587                                 move_east[1] -= move_east[0];
 588                                 move_north[1] -= move_north[0];
 589                                 /* the game takes 4 steps to move the player */
 590                                 mercenary_vr_move(1, move_east, move_north, 256, 256);
 591                         }
 592
 593                         /* snap orientation to steps of 45 degrees */
 594                         if (we_rotate == 1) {
 595                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 596                                 yaw = round(yaw / degrees45) * degrees45;
 597                                 /* if we rotate: change orientation */
 598                                 if (stick_right_x > 0)
 599                                         yaw -= degrees45;
 600                                 else
 601                                         yaw += degrees45;
 602                                 /* rotate only once per stick movement */
 603                                 we_rotate = 2;
 604                                 mercenary_set_orientation(yaw);
 605                         }
 606                 }
 607                 if (joystick_set_x_last && !joystick_set_x)
 608                         set_joystick(0, 0, -1, -1, -1);
 609                 if (joystick_set_y_last && !joystick_set_y)
 610                         set_joystick(-1, -1, 0, 0, -1);
 611                 /* thrust */
 612                 /* button to toggle between stop and escape */
 613                 if (button_left_thumb && !button_left_thumb_last) {
 614                         /* 'escape' pressed */
 615                         if (thrust_last != -99)
 616                                 thrust = -99;
 617                         else
 618                                 thrust = 0;
 619                 }
 620                 /* button to stop */
 621                 if (button_left_trigger && !button_left_trigger_last) {
 622                         /* 'stop' pressed */
 623                         thrust = 0;
 624                 }
 625                 /* get stick to increment or decrement thrust */
 626                 if (stick_left_y > STICK_THRUST_THRESHOLD)
 627                         increment = (stick_left_y - STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 628                 else
 629                 if (stick_left_y < -STICK_THRUST_THRESHOLD)
 630                         increment = (stick_left_y + STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 631                 else
 632                         increment = 0;
 633                 current_time = ticks_sdl();
 634                 if (increment) {
 635                         diff = current_time - last_time;
 636                         inc_count += increment * diff;
 637                         /* if we are in 'escape' mode, we stop thrust first */
 638                         if (thrust == -99)
 639                                 thrust = 0;
 640                         if (inc_count > 150.0 && thrust >= -10 && thrust < 10) {
 641                                 thrust++;
 642                                 inc_count = 0.0;
 643                         }
 644                         if (inc_count < -150.0 && thrust <= 10 && thrust > -10) {
 645                                 thrust--;
 646                                 inc_count = 0.0;
 647                         }
 648                 } else {
 649                         inc_count = 0;
 650                 }
 651                 last_time = current_time;
 652                 /* send thrust change as keycodes */
 653                 if (thrust_last != thrust) {
 654                         /* if we were in escape mode, we stop us first and then apply the new code */
 655                         if (thrust_last == -99) {
 656                                 set_amiga_key(KEYCODE_SPACE, 1);
 657                                 set_amiga_key(KEYCODE_SPACE, 0);
 658                         }
 659
 660                         if (thrust >= 10) {
 661                                 set_amiga_key(KEYCODE_0, 1);
 662                                 set_amiga_key(KEYCODE_0, 0);
 663                         } else
 664                         if (thrust <= -10 && thrust > -99) {
 665                                 set_amiga_key(KEYCODE_F10, 1);
 666                                 set_amiga_key(KEYCODE_F10, 0);
 667                         } else
 668                         if (thrust <= -99) {
 669                                 set_amiga_key(KEYCODE_ESCAPE, 1);
 670                                 set_amiga_key(KEYCODE_ESCAPE, 0);
 671                         } else
 672                         if (thrust > 0) {
 673                                 set_amiga_key(KEYCODE_1 + thrust - 1, 1);
 674                                 set_amiga_key(KEYCODE_1 + thrust - 1, 0);
 675                         } else
 676                         if (thrust < 0) {
 677                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 1);
 678                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 0);
 679                         } else {
 680                                 set_amiga_key(KEYCODE_SPACE, 1);
 681                                 set_amiga_key(KEYCODE_SPACE, 0);
 682                         }
 683                 }
 684         }
 685         button_a_last = button_a;
 686         button_b_last = button_b;
 687         button_x_last = button_x;
 688         button_y_last = button_y;
 689         button_menu_last = button_menu;
 690         button_left_trigger_last = button_left_trigger;
 691         button_right_trigger_last = button_right_trigger;
 692         button_left_thumb_last = button_left_thumb;
 693         button_right_thumb_last = button_right_thumb;
 694         stick_left_x_last = stick_left_x;
 695         stick_left_y_last = stick_left_y;
 696         stick_right_x_last = stick_right_x;
 697         stick_right_y_last = stick_right_y;
 698         thrust_last = thrust;
 699         joystick_set_x_last = joystick_set_x;
 700         joystick_set_y_last = joystick_set_y;
 701
 702         /* we must handle keyboard after toggeling keyboard_on,
 703          * so that keyboard_on will not change until keyboard is rendered */
 704         vr_key = 0;
 705         keyboard_on = handle_vr_keyboard(hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 706 }
 707 #endif
 708
 709 static void skip_intro(void)
 710 {
 711         int event;
 712         double render_delay = 0.0;
 713         double cycle_count;
 714
 715         if (intro_skipped)
 716                 return;
 717
 718         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 719         do {
 720                 /* render, if not delayed */
 721                 if (render_delay <= 0.0) {
 722                         cycle_count = 0;
 723                         do {
 724                                 cycle_count += execute_cpu(0, &event);
 725                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 726                         render_delay += (double)cycle_count / CPU_SPEED;
 727                 }
 728                 /* VBL */
 729                 execute_cpu(3, NULL);
 730                 /* count down render delay */
 731                 if (render_delay) {
 732                         render_delay -= 1.0 / (double)IRQ_RATE;
 733                         if (render_delay < 0.0)
 734                                 render_delay = 0.0;
 735                 }
 736         } while (event != STOP_AT_CLEAR_SCREEN1);
 737
 738         intro_skipped = 1;
 739 }
 740
 741 static void special_event(int event)
 742 {
 743 #ifdef HAVE_OVR
 744         /* handle VR events */
 745         if (event == STOP_AT_PATCH_VR) {
 746                 mercenary_patch_vr();
 747                 return;
 748         }
 749 #endif
 750         /* handle events to improve rendering */
 751         if (render_improved)
 752                 render_capture_event(event);
 753 }
 754
 755 static void main_loop(void)
 756 {
 757         double frame_step, frame_time = 0.0, frame_render = 1;
 758         int had_first_irq = 0;
 759         static uint32_t current_time, last_time = 0, diff;
 760         int i, rc;
 761         int space, length;
 762         int cycle_count, event = STOP_AT_END;
 763         double render_delay = 0.0;
 764         uint32_t palette_address;
 765         uint16_t palette[16];
 766         int all_white = 0;
 767 #ifdef HAVE_OVR
 768         int eye;
 769         int vr = 1;
 770 #else
 771         int vr = 0;
 772 #endif
 773
 774         last_time = ticks_sdl();
 775
 776         /* render result on window */
 777         while (!quit) {
 778 #ifdef HAVE_OVR
 779                 /* quit by OVR server */
 780                 if (should_quit_ovr())
 781                         break;
 782                 /* get vr poses */
 783                 handle_vr_poses();
 784 #endif
 785                 /* if we are in interstellar fligt, we use 50 Hz */
 786                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 787                 /* else we use whatever frame rate the user wants */
 788                 if (render_capture_is_interstellar())
 789                         frame_step = vbl_duration * 50.0;
 790                 else if (!intro_skipped)
 791                         frame_step = vbl_duration * 10.0;
 792                 else
 793                         frame_step = vbl_duration * config_fps;
 794                 if (frame_step > 1.0)
 795                         frame_step = 1.0;
 796                 /* handle SDL events */
 797                 rc = event_sdl();
 798                 if (rc)
 799                         break;
 800
 801                 /* initialize rendering */
 802                 debug_opengl = config_debug_opengl;
 803                 benson_size = config_benson_size;
 804                 render_legacy = (!config_render) || debug_opengl;
 805                 render_improved = config_render || debug_opengl;
 806                 if (!render_improved) {
 807                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 808                         render_capture_reset();
 809                 }
 810                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 811                 /* amgia speed: don't render if we still delay */
 812                 /* non amiga speed: render if we need a new frame */
 813                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 814                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 815                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 816                 if (((frame_render && !config_amiga_speed)
 817                   || (config_amiga_speed && render_delay <= 0.0)
 818                   || event == STOP_AT_WAIT_INPUT)
 819                 && !(had_first_irq && help_view)) {
 820                         frame_render = 0;
 821                         /* start capturing for improved graphics */
 822                         if (render_improved)
 823                                 render_capture_start(config_fov, config_improve_extend_roads, config_improve_smooth_planets, config_improve_stars_rotation, config_improve_fix_sky_rotation, config_improve_round_planets, config_improve_shadows, config_debug_transparent);
 824
 825                         /* execute until the rendered image is ready (wait for VBL) */
 826                         cycle_count = 0;
 827                         do {
 828                                 cycle_count += execute_cpu(0, &event);
 829                                 /* handle special events */
 830                                 special_event(event);
 831                                 if (event == STOP_AT_CLEAR_SCREEN1)
 832                                         intro_skipped = 1;
 833                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 834                         /* stop capturing for improved graphics */
 835                         if (render_improved)
 836                                 render_capture_stop();
 837                         /* copy palette */
 838                         palette_address = mercenary_palette_view();
 839                         for (i = 0; i < 16; i++)
 840                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 841                         /* for amiga speed: set delay by the number of cycles */
 842                         if (config_amiga_speed)
 843                                 render_delay += (double)cycle_count / CPU_SPEED;
 844                         /* reset joystick after rendering */
 845                         reset_joystick();
 846                 }
 847
 848                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 849 #ifdef HAVE_OVR
 850                 begin_render_ovr();
 851
 852                 for (eye = 0; eye < 2; eye++) {
 853                         double camera_x, camera_y, camera_z;
 854                         int ovr_width, ovr_height;
 855                         /* begin of rendering eye, viewport and frustum is set here */
 856                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z, &ovr_width, &ovr_height);
 857 #else
 858                 {
 859 #endif
 860                         /* clear screen */
 861                         opengl_clear(vr);
 862                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 863                         if (render_improved) {
 864 #ifdef HAVE_OVR
 865                                 opengl_set_size(ovr_width, ovr_height);
 866 #else
 867                                 /* viewport and frustum is set here */
 868                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 869 #endif
 870                                 /* render improved graphics, interpolate, if required,
 871                                  * if no item list is available, for legacy rendering
 872                                  */
 873                                 if (all_white)
 874                                         rc = render_all_white(vr);
 875                                 else
 876                                         rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, vr);
 877                                 if (rc)
 878                                         goto goto_legacy;
 879                                 opengl_blit_image(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, 1, config_fov, config_monitor_distance, benson_size, vr);
 880                                 if (help_view)
 881                                         opengl_blit_osd(0, help_osd[help_view - 1], config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, (vr) ? FOV_NOVAGEN : config_fov, config_monitor_distance, (vr) ? 1.0 : benson_size, 1.0, 1.0, 0.0, 0.0);
 882                                 if (osd_timer) {
 883                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, (vr) ? FOV_NOVAGEN : config_fov, config_monitor_distance, (vr) ? 1.0 : benson_size, 0.5, 0.04, 0.5, -0.95);
 884                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 885                                                 osd_timer = 0;
 886                                 }
 887 #ifndef HAVE_OVR
 888                                 /* draw border around legacy render area */
 889                                 if (border_timer) {
 890                                         opengl_render_color(1.0, 0.0, 0.0, 1.0);
 891                                         opengl_render_line(160, -68, 256, 160, 68, 256, 0.0);
 892                                         opengl_render_line(-160, -68, 256, -160, 68, 256, 0.0);
 893                                         opengl_render_line(-160, 68, 256, 160, 68, 256, 0.0);
 894                                         opengl_render_line(-160, -68, 256, 160, -68, 256, 0.0);
 895                                         if (border_timer - (int32_t)ticks_sdl() < 0)
 896                                                 border_timer = 0;
 897                                 }
 898 #endif
 899                         }
 900                         /* setup viewport for legacy image and render image, if enabled */
 901                         /* also render legacy, if render_improved failed due to not (yet) available items */
 902                         if (render_legacy) {
 903                                 goto_legacy:
 904                                 /* render game view without benson
 905                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 906                                  */
 907                                 if (had_first_irq)
 908                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 909 #ifdef HAVE_OVR
 910                                 opengl_set_size(ovr_width, ovr_height);
 911 #else
 912                                 /* viewport and frustum is set here */
 913                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, 1.0);
 914 #endif
 915                                 opengl_blit_image(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, 0, FOV_NOVAGEN, config_monitor_distance, 1.0, 0);
 916                                 if (help_view)
 917                                         opengl_blit_osd(0, help_osd[help_view - 1], config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, config_monitor_distance, 1.0, 1.0, 1.0, 0.0, 0.0);
 918                                 if (osd_timer) {
 919                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, config_monitor_distance, 1.0, 0.5, 0.04, 0.5, -0.95);
 920                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 921                                                 osd_timer = 0;
 922                                 }
 923                         }
 924 #ifdef HAVE_OVR
 925                         /* render keyboard */
 926                         if (keyboard_on)
 927                                 render_vr_keyboard(camera_x, camera_y);
 928
 929                         /* end of rendering eye */
 930                         end_render_ovr_eye(eye);
 931                 }
 932                 /* at this point we are ready with our image, so we display */
 933                 end_render_ovr();
 934                 render_mirror_ovr(window_width, window_height);
 935 #else
 936                 }
 937 #endif
 938                 swap_sdl();
 939
 940                 /* advance frame time, if we are not in help view  */
 941                 if (!(had_first_irq && help_view)) {
 942                         frame_time += frame_step;
 943                         if (frame_time >= 1.0) {
 944                                 frame_time -= 1.0;
 945                                 frame_render = 1;
 946                         }
 947                 }
 948
 949                 /* measure frame rate */
 950                 framerate_measure();
 951
 952                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 953                 /* only do this, if we are not in help view */
 954                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 955                 if (!(had_first_irq && help_view)) {
 956                         current_time = ticks_sdl();
 957                         diff = current_time - last_time;
 958                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 959                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 960                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 961                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 962                         }
 963                         while (diff > 1000 / IRQ_RATE) {
 964                                 /* trigger and execute IRQ 3 = VBL */
 965                                 execute_cpu(3, NULL);
 966                                 had_first_irq = 1;
 967                                 /* transfer benson without game view
 968                                  * because we only got benson refreshed during VBL IRQ
 969                                  */
 970                                 all_white = emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 971                                 /* render sound to sound buffer
 972                                  * buffer pointer read and write is atomic, so no locking required!
 973                                  */
 974                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 975                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 976 #ifdef DEBUG_SOUND_BUFFERING
 977                                         fprintf(stderr, "sound buffer overflow\n");
 978 #endif
 979                                         length = space;
 980                                 } else
 981                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 982 #ifdef DEBUG_SOUND_BUFFERING
 983                                 printf("can write %d, write %d\n", space, length);
 984                                 static int cnt = 0;
 985                                 int s;
 986                                 for (s = 0; s < length; s++) {
 987                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 988                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 989                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 990                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 991                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 992                                          cnt++;
 993                                 }
 994 #else
 995                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 996 #endif
 997                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 998                                 diff -= 1000 / IRQ_RATE;
 999                                 last_time += 1000 / IRQ_RATE;
1000
1001                                 /* count down render delay */
1002                                 if (render_delay) {
1003                                         render_delay -= 1.0 / (double)IRQ_RATE;
1004                                         if (render_delay < 0.0)
1005                                                 render_delay = 0.0;
1006                                 }
1007                         }
1008                 }
1009         }
1010 }
1011
1012 static uint16_t io_read(uint32_t address)
1013 {
1014         uint16_t value = 0xffff;
1015
1016         /* joystick and fire button */
1017         if (address == 0xbfe000 || address == 0xdff00c)
1018                 value &= emulate_joystick_read(address);
1019         /* keyboard */
1020         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
1021                 value &= emulate_keyboard_read(address);
1022         /* diskette */
1023         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
1024                 value &= emulate_disk_read(address);
1025
1026         return value;
1027 }
1028
1029 static void io_write(uint32_t address, uint16_t value)
1030 {
1031         /* dmacon and sound registers */
1032         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
1033                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
1034         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
1035                 emulate_disk_write(address, value);
1036 }
1037
1038 /* two tracks with 0x1820 words of length */
1039 static uint8_t game_save[2][0x1820 << 1];
1040 static int last_track = 0;
1041
1042 /* game reads track with saved game */
1043 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
1044 {
1045         if (length > sizeof(game_save[0])) {
1046                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
1047                 return;
1048         }
1049
1050         /* if even track is selected, load game */
1051         if (!(track & 1)) {
1052                 char filename[256];
1053                 int gamesave_num = (track - 2) >> 1;
1054
1055                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
1056
1057                 if (mission_disk == 0) {
1058                         int got;
1059                         FILE *fp;
1060
1061 #if defined(_WIN32)
1062                         filename[0] = '\0';
1063 #else
1064                         sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
1065                         mkdir(filename, 0777);
1066 #endif
1067                         sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
1068                         fp = fopen(filename, "r");
1069                         if (!fp) {
1070 fail:
1071                                 print_info("failed to load game from '%s'\n", filename);
1072                                 osd_info("load game", "FAILED!");
1073                                 goto copy;
1074                         }
1075                         got = fread(game_save, sizeof(game_save[0]), 2, fp);
1076                         fclose(fp);
1077                         if (got != 2)
1078                                 goto fail;
1079                         sprintf(filename, "#%d", gamesave_num);
1080                         osd_info("loaded game", filename);
1081                 } else {
1082                         const uint8_t *mission_data = get_mission_disk(mission_disk, gamesave_num);
1083                         sprintf(filename, "disk %d #%d", mission_disk, gamesave_num);
1084                         if (!mission_data) {
1085                                 print_info("failed to load mission %s\n", filename);
1086                                 osd_info("load mission", "FAILED!");
1087                                 goto copy;
1088                         }
1089                         memcpy(game_save, mission_data, 0x1820 << 2);
1090                         osd_info("loaded mission", filename);
1091                 }
1092         }
1093
1094 copy:
1095         /* copy track */
1096         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
1097 }
1098
1099 /* game writes track with saved game */
1100 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
1101 {
1102         /* cannot save on mission disk */
1103         if (mission_disk) {
1104                 osd_info("", "not applicable");
1105                 return;
1106         }
1107
1108         /* skip sync info that is provided by game and only relevant for a real disk track */
1109         data += 0x200;
1110         length -= 0x200;
1111
1112         if (length != sizeof(game_save[0])) {
1113                 print_error("saving game state failed, because length of data does not match, please fix!\n");
1114                 return;
1115         }
1116
1117         /* don't save if last track is the same, because disk is written on both sides with the same data */
1118         if (track == last_track) {
1119                 if (memcmp(memory + data, game_save[track & 1], length)) {
1120                         print_error("saving game data on other side of the disk is different, please fix!\n");
1121                 }
1122                 return;
1123         }
1124         last_track = track;
1125
1126         /* save game data */
1127         memcpy(game_save[track & 1], memory + data, length);
1128
1129         /* if done with saving */
1130         if ((track & 1)) {
1131                 char filename[256];
1132                 int gamesave_num = (track - 2) >> 1;
1133                 int wrote;
1134                 FILE *fp;
1135
1136 #if defined(_WIN32)
1137                 filename[0] = '\0';
1138 #else
1139                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
1140                 mkdir(filename, 0777);
1141 #endif
1142                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
1143                 fp = fopen(filename, "w");
1144                 if (!fp) {
1145 fail:
1146                         print_error("failed to save game to '%s'\n", filename);
1147                         osd_info("save game", "FAILED!");
1148                         return;
1149                 }
1150                 print_info("Game state saved to '%s'\n", filename);
1151                 sprintf(filename, "#%d", gamesave_num);
1152                 osd_info("saved game", filename);
1153                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
1154                 fclose(fp);
1155                 if (wrote != 2)
1156                         goto fail;
1157         }
1158 }
1159
1160 static int shift = 0, ctrl = 0, alt = 0;
1161
1162 static void keyboard_sdl(int down, enum keycode keycode)
1163 {
1164         switch (keycode) {
1165         case KEYCODE_LCTRL:
1166         case KEYCODE_RCTRL:
1167                 ctrl = down;
1168                 break;
1169         default: break;
1170         }
1171
1172         if (ctrl && down) {
1173                 switch (keycode) {
1174                 case KEYCODE_h:
1175                         toggle_help();
1176                         break;
1177                 case KEYCODE_v:
1178                         config_video_filter ^= 1;
1179                         osd_info("video filter", (config_video_filter) ? "on" : "off");
1180                         break;
1181                 case KEYCODE_a:
1182                         config_audio_filter ^= 1;
1183                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
1184                         break;
1185                 case KEYCODE_s:
1186                         config_amiga_speed ^= 1;
1187                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
1188                         break;
1189                 case KEYCODE_r:
1190                         config_render ^= 1;
1191                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
1192                         break;
1193                 case KEYCODE_l:
1194                         config_improve_shadows ^= 1;
1195                         osd_info("shadows", (config_improve_shadows) ? "on" : "off");
1196                         break;
1197                 case KEYCODE_b:
1198                         if (!config_render && !config_debug_opengl) {
1199                                 osd_info("", "not applicable");
1200                                 break;
1201                         }
1202                         if (config_benson_size == 0.5) {
1203                                 config_benson_size = 1.0;
1204                                 config_fov = FOV_NOVAGEN;
1205                         } else {
1206                                 config_benson_size = 0.5;
1207                                 config_fov = FOV_JOLLY;
1208                         }
1209                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
1210                         border_timer = ticks_sdl() + 1500;
1211                         break;
1212                 case KEYCODE_i:
1213                         if (!intro_skipped)
1214                                 skip_intro();
1215                         else
1216                                 osd_info("", "not applicable");
1217                         break;
1218                 case KEYCODE_1:
1219                         if (get_mission_disk(1, 1)) { /* just to check support */
1220                                 mission_disk = 1;
1221                                 osd_info("mission disk", "insert 1");
1222                         } else
1223                                 osd_info("", "not applicable");
1224                         break;
1225                 case KEYCODE_2:
1226                         if (get_mission_disk(2, 1)) { /* just to check support */
1227                                 mission_disk = 2;
1228                                 osd_info("mission disk", "insert 2");
1229                         } else
1230                                 osd_info("", "not applicable");
1231                         break;
1232                 case KEYCODE_0:
1233                         if (get_mission_disk(1, 1)) { /* just to check support */
1234                                 mission_disk = 0;
1235                                 osd_info("mission disk", "removed");
1236                         } else
1237                                 osd_info("", "not applicable");
1238                         break;
1239                 case KEYCODE_c:
1240                         if (config_ctrl_c)
1241                                 quit = 1;
1242                         break;
1243                 case KEYCODE_o:
1244 #ifdef HAVE_OVR
1245                         reset_observer_ovr();
1246                         osd_info("", "reset observer");
1247 #else
1248                         osd_info("", "not applicable");
1249 #endif
1250                         break;
1251                 case KEYCODE_KP_PLUS:
1252 #ifdef HAVE_OVR
1253                         osd_info("", "not applicable");
1254 #else
1255                         if (config_fov / 1.2 >= FOV_MIN)
1256                                 config_fov /= 1.2;
1257                         disp_fov:
1258                         {
1259                                 char text[16];
1260                                 if (config_fov < 63.5 || config_fov > 64.5)
1261                                         sprintf(text, "%.2f", config_fov);
1262                                 else
1263                                         sprintf(text, "%.2f (default)", config_fov);
1264                                 osd_info("FOV", text);
1265                                 border_timer = ticks_sdl() + 1500;
1266                         }
1267 #endif
1268                         break;
1269                 case KEYCODE_KP_MINUS:
1270 #ifdef HAVE_OVR
1271                         osd_info("", "not applicable");
1272 #else
1273                         if (config_fov * 1.2 <= FOV_MAX)
1274                                 config_fov *= 1.2;
1275                         goto disp_fov;
1276 #endif
1277                         break;
1278                 default: break;
1279                 }
1280                 /* do not pass keys to game while holding CTRL */
1281                 return;
1282         }
1283
1284         if (help_view == 1 && down) {
1285                 help_view = 2;
1286                 return;
1287         }
1288
1289         if (keycode == KEYCODE_PAUSE && down) {
1290                 toggle_help();
1291                 return;
1292         }
1293
1294         /* in help view we must not forward keypresses */
1295         if (help_view)
1296                 return;
1297
1298         switch (keycode) {
1299         case KEYCODE_LSHIFT:
1300                 set_amiga_key(keycode, down);
1301                 shift = down;
1302                 break;
1303         case KEYCODE_RSHIFT:
1304                 set_amiga_key(keycode, down);
1305                 shift = down;
1306                 break;
1307         case KEYCODE_LALT:
1308                 set_amiga_key(keycode, down);
1309                 alt = down;
1310                 break;
1311         case KEYCODE_RALT:
1312                 set_amiga_key(keycode, down);
1313                 alt = down;
1314                 break;
1315         case KEYCODE_LEFT:
1316                 if (shift && down) {
1317                         set_amiga_key(keycode, down);
1318                         set_joystick(-1, -1, -1, -1, -1);
1319                         break;
1320                 }
1321                 set_amiga_key(keycode, 0);
1322                 set_joystick(down, -1, -1, -1, -1);
1323                 break;
1324         case KEYCODE_RIGHT:
1325                 if (shift && down) {
1326                         set_amiga_key(keycode, down);
1327                         set_joystick(-1, -1, -1, -1, -1);
1328                         break;
1329                 }
1330                 set_amiga_key(keycode, 0);
1331                 set_joystick(-1, down, -1, -1, -1);
1332                 break;
1333         case KEYCODE_UP:
1334                 if (shift && down) {
1335                         set_amiga_key(keycode, down);
1336                         set_joystick(-1, -1, -1, -1, -1);
1337                         break;
1338                 }
1339                 set_amiga_key(keycode, 0);
1340                 if (!alt || down)
1341                         set_joystick(-1, -1, down, 0, -1);
1342                 break;
1343         case KEYCODE_DOWN:
1344                 if (shift && down) {
1345                         set_amiga_key(keycode, down);
1346                         set_joystick(-1, -1, -1, -1, -1);
1347                         break;
1348                 }
1349                 set_amiga_key(keycode, 0);
1350                 if (!alt || down)
1351                         set_joystick(-1, -1, 0, down, -1);
1352                 break;
1353         case KEYCODE_END:
1354                 set_joystick(-1, -1, -1, -1, down);
1355                 break;
1356         case KEYCODE_INSERT:
1357                 set_amiga_key(KEYCODE_HELP, down);
1358                 break;
1359         default:
1360                 /* reset vr thrust */
1361 #ifdef HAVE_OVR
1362                 thrust_last = 0;
1363 #endif
1364                 set_amiga_key(keycode, down);
1365         }
1366 }
1367
1368 static double joystick_last_x = 0, joystick_last_y = 0;
1369 static int joystick_last_fire = 0;
1370
1371 static void joystick_sdl(double x, double y, int fire)
1372 {
1373         int left = -1, right = -1, up = -1, down = -1;
1374
1375         if (x <= -0.5 && joystick_last_x > -0.5)
1376                 left = 1;
1377         if (x > -0.5 && joystick_last_x <= -0.5)
1378                 left = 0;
1379         if (x >= 0.5 && joystick_last_x < 0.5)
1380                 right = 1;
1381         if (x < 0.5 && joystick_last_x >= 0.5)
1382                 right = 0;
1383         if (y <= -0.5 && joystick_last_y > -0.5)
1384                 up = 1;
1385         if (y > -0.5 && joystick_last_y <= -0.5)
1386                 up = 0;
1387         if (y >= 0.5 && joystick_last_y < 0.5)
1388                 down = 1;
1389         if (y < 0.5 && joystick_last_y >= 0.5)
1390                 down = 0;
1391         set_joystick(left, right, up, down, fire);
1392         joystick_last_x = x;
1393         joystick_last_y = y;
1394         joystick_last_fire = fire;
1395 }
1396
1397 void audio_sdl(float *data, int length)
1398 {
1399         int fill, s;
1400
1401         /* read sound from sound buffer
1402          * buffer pointer read and write is atomic, so no locking required!
1403          */
1404         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1405         if (fill < length) {
1406 #ifdef DEBUG_SOUND_BUFFERING
1407                 fprintf(stderr, "sound buffer underrun\n");
1408 #endif
1409                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1410                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1411         }
1412         for (s = 0; s < length; s++) {
1413                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1414                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1415         }
1416 #ifdef DEBUG_SOUND_BUFFERING
1417         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1418 #endif
1419         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1420 }
1421
1422 /* used for geier counter */
1423 void sound_irq(void)
1424 {
1425         /* trigger and execute IRQ 4 = sound */
1426         execute_cpu(4, NULL);
1427 }
1428
1429 extern uint8_t mercenary_splash_palette[][3];
1430 extern char mercenary_splash_pixels[];
1431
1432 int main(int argc, char *argv[])
1433 {
1434         int rc;
1435         int sdl_sound_chunk;
1436
1437         home_dir = getenv("HOME");
1438         if (!home_dir)
1439                 home_dir = "";
1440
1441         rc = parse_args(argc, argv);
1442         if (rc)
1443                 return 0;
1444
1445         /* allocate image */
1446         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1447         if (!image) {
1448                 print_error("Failed to allocate image buffer\n");
1449                 goto done;
1450         }
1451
1452         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1453                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1454                 goto done;
1455         }
1456         if ((1000 % IRQ_RATE)) {
1457                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1458                 goto done;
1459         }
1460
1461         /* calculate SDL chunk size for audio
1462          * it must be a power of two, but not more than the chunk size for each IRQ!
1463          */
1464         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1465                 ;
1466         sdl_sound_chunk >>= 1;
1467 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1468
1469         /* allocate sound buffers */
1470         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1471         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1472         if (!sound_buffer) {
1473                 print_error("Failed to allocate image buffer\n");
1474                 goto done;
1475         }
1476
1477         /* allocate memory */
1478         memory = calloc(MEMORY_SIZE, 1);
1479         if (!memory) {
1480                 print_error("Failed to allocate cpu's memory\n");
1481                 goto done;
1482         }
1483         stop_event = calloc(MEMORY_SIZE, 1);
1484         if (!stop_event) {
1485                 print_error("Failed to allocate cpu's stop_event memory\n");
1486                 goto done;
1487         }
1488         chipreg = calloc(IOSIZE, 1);
1489         if (!chipreg) {
1490                 print_error("Failed to allocate chip register\n");
1491                 goto done;
1492         }
1493
1494         /* init cpu code */
1495         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1496
1497         /* init disk emulation */
1498         disk_init(disk_read, disk_write);
1499
1500         /* load binary */
1501         mercenary_load();
1502
1503         /* patch some stuff */
1504         mercenary_patch();
1505
1506         /* init SDL and OpenGL */
1507 #ifdef HAVE_OVR
1508         int vbl_sync = 0;
1509         int vr = 1;
1510         int multisampling = 0;
1511         window_width = SCREEN_WIDTH;
1512         window_height = SCREEN_HEIGHT;
1513 #else
1514         int vbl_sync = 1;
1515         int vr = 0;
1516         int multisampling = config_multisampling;
1517         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1518         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1519 #endif
1520         rc = init_sdl(mercenary_name, window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, config_joystick, config_joystick_x, config_joystick_y, config_joystick_fire, joystick_sdl, audio_sdl, resize_window, multisampling, vbl_sync, vr);
1521         if (rc < 0)
1522                 goto done;
1523         rc = init_shadow_buffer(config_multisampling);
1524         if (rc < 0)
1525                 goto done;
1526 #ifdef HAVE_OVR
1527         rc = init_ovr(config_multisampling);
1528         if (rc < 0)
1529                 goto done;
1530         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1531         if (rc < 0)
1532                 goto done;
1533 #endif
1534         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1535         if (rc < 0)
1536                 goto done;
1537
1538         /* init osd */
1539         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1540         if (rc < 0)
1541                 goto done;
1542         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1543         if (rc < 0)
1544                 goto done;
1545         help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, 0x00);
1546         if (!help_osd[0])
1547                 goto done;
1548         text_insert_image(help_osd[0], mercenary_splash_palette, mercenary_splash_pixels, 0xff);
1549         help_views++;
1550         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1551         if (!help_osd[1])
1552                 goto done;
1553         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
1554         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1555                 "Emulation:\n"
1556                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1557                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1558                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1559                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1560                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1561                 "        Press `CTRL' + `V' or 'A' to toggle video or audio filter on / off.\n"
1562                 "        Press `CTRL' + `L' to toggle shadows on / off.\n"
1563                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1564                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1565                 "        Press `CTRL' + `1' or `2' to insert or `0' to remove mission disk.\n"
1566 #ifdef HAVE_OVR
1567                 "        Press `CTRL' + `O' to reset observer position.\n"
1568 #endif
1569                 "\n"
1570                 "Answer to a Question:\n"
1571                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1572                 "\n"
1573                 "Walking / Driving / Flying:\n"
1574                 "        Use cursor keys as joystick, to move player / craft.\n"
1575                 "        Press `R' for running, 'W' for walking speed.\n"
1576                 "        Press `B' to board, `L' to leave.\n"
1577                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1578                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1579                 "        Press `SPACE' to stop craft.\n"
1580                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1581                 "        Press `T' for turbo on certain craft.\n"
1582                 "        Press `END' as joystick's fire button.\n"
1583                 "\n"
1584                 "Elevator:\n"
1585                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1586                 "\n"
1587                 "Inside a transporter:\n"
1588                 "        Press `1'...`0' to select destination.\n"
1589                 "\n"
1590                 "Items:\n"
1591                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1592                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1593                 "        Press `NUMPAD Enter' to select certain items.\n"
1594                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1595                 "        Press `NUMPAD *' to read entry\n"
1596                 "Saving / Loading / Pause:\n"
1597                 "        Press `INSERT' to loading and saving options.\n"
1598                 "        Press `ENTER' to pause game, other key to continue.\n"
1599                 ,HELP_ALPHA, 1, 2, 5, 0);
1600                 help_views++;
1601 #ifdef HAVE_OVR
1602         help_osd[2] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1603         if (!help_osd[2])
1604                 goto done;
1605         text_render(help_osd[2], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
1606         text_render(help_osd[2], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1607                 "Emulation using Controller:\n"
1608                 "        Press `A' or 'X' button to toggle this help screen on or off.\n"
1609                 "        Press 'B' or 'Y' button to reset observer position. (importaint!)\n"
1610                 "        To have a virtual keyboard, point right hand below control pannel.\n"
1611                 "        Point to a key on keyboard. The key will highlight.\n"
1612                 "        Pull `Trigger' on right controller to enter the highlighted key.\n"
1613                 "\n"
1614                 "Walking / Driving / Flying using Controller:\n"
1615                 "        Use thumb stick on right controller, to move player / craft.\n"
1616                 "        Move thumb stick forth and back to walk, left and right to rotate.\n"
1617                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1618                 "        Pull `Trigger' on left controller stop craft.\n"
1619                 "        Press thumb stick on left controller for escape sequence and stop it.\n"
1620                 "        Pull `Trigger' on right controller to fire.\n"
1621                 "\n"
1622                 "For all other game function, use the virtual or real keyboard!\n"
1623                 ,HELP_ALPHA, 1, 2, 5, 0);
1624                 help_views++;
1625 #endif
1626         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1627         if (!info_osd)
1628                 goto done;
1629
1630         /* init audio */
1631         sound_init(SOUND_SAMPLERATE, sound_irq);
1632
1633         /* start cpu */
1634         reset_cpu();
1635
1636         if (config_skip_intro)
1637                 skip_intro();
1638
1639         /* run game */
1640         main_loop();
1641
1642 done:
1643         exit_opengl();
1644 #ifdef HAVE_OVR
1645         exit_ovr();
1646 #endif
1647         exit_sdl();
1648
1649         if (chipreg)
1650                 free(chipreg);
1651         if (stop_event)
1652                 free(stop_event);
1653         if (memory)
1654                 free(memory);
1655         if (sound_buffer)
1656                 free(sound_buffer);
1657         if (image)
1658                 free(image);
1659         while (help_views) {
1660                 help_views--;
1661                 if (help_osd[help_views])
1662                         free(help_osd[help_views]);
1663         }
1664         if (info_osd)
1665                 free(info_osd);
1666
1667         return 0;
1668 }