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