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