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 = 16.0;
  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 = 0.5;
  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 = 40.5; /* 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;
 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 }
 379
 380 #ifdef HAVE_OVR
 381 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;
 382 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;
 383 static int thrust_last = 0;
 384 static int joystick_set_x_last = 0, joystick_set_y_last = 0;
 385 static int keyboard_on = 0;
 386 static enum keycode vr_key_pressed = 0, vr_key = 0;
 387
 388 static void handle_vr_poses(void)
 389 {
 390         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;
 391         double hand_right_x = 0.0, hand_right_y = 0.0, hand_right_z = 0.0;
 392         double hand_right_yaw = 0.0, hand_right_pitch = 0.0, hand_right_roll = 0.0;
 393         double head_yaw = 0.0, head_pitch = 0.0, head_roll = 0.0;
 394         double stick_left_x = 0.0, stick_left_y = 0.0, stick_right_x = 0.0, stick_right_y = 0.0;
 395         int thrust = thrust_last;
 396         int joystick_set_x = 0, joystick_set_y = 0;
 397         static uint32_t current_time, last_time = 0, diff;
 398         static double increment, inc_count = 0.0;
 399
 400         /* handle input */
 401         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);
 402         if (button_menu && !button_menu_last) {
 403                 /* menu toggle */
 404                 toggle_help();
 405         }
 406         if (button_right_thumb) {
 407                 /* reset observer */
 408                 reset_observer_ovr();
 409                 osd_info("", "reset observer");
 410         }
 411         if (!help_view) {
 412                 if (button_x && !button_x_last) {
 413                         /* 'board' pressed */
 414                         set_amiga_key(KEYCODE_b, 1);
 415                         set_amiga_key(KEYCODE_b, 0);
 416                         /* important: get rid of old state */
 417                         thrust = 0;
 418                 }
 419                 if (button_y && !button_y_last) {
 420                         /* 'leave' pressed */
 421                         set_amiga_key(KEYCODE_l, 1);
 422                         set_amiga_key(KEYCODE_l, 0);
 423                 }
 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                                 }
 431                         } else
 432                         if (mercenary_get_info_walking()) {
 433                                 /* change orientation */
 434                                 double roll, pitch, yaw;
 435                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 436                                 mercenary_set_orientation(yaw + hand_right_yaw);
 437                         } else {
 438                                 /* fire button */
 439                                 set_joystick(-1, -1, -1, -1, 1);
 440                         }
 441                 }
 442                 if (!button_right_trigger && button_right_trigger_last) {
 443                         /* trigger released */
 444                         set_joystick(-1, -1, -1, -1, 0);
 445                         if (vr_key_pressed) {
 446                                 set_amiga_key(vr_key_pressed, 0);
 447                                 vr_key_pressed = 0;
 448                         }
 449                 }
 450                 /* joystick */
 451                 /* reset moving state, so the game is not influenced before we want to */
 452                 mercenary_vr_move(0, NULL, NULL, 256, 256);
 453                 joystick_set_x = 0;
 454                 joystick_set_y = 0;
 455                 if (!mercenary_get_info_walking()) {
 456                         /* turn right and left when not walking */
 457                         if (stick_right_x > STICK_ROTATE_THRESHOLD) {
 458                                 set_joystick(0, 1, -1, -1, -1);
 459                                 joystick_set_x = 1;
 460                         } else
 461                         if (stick_right_x < -STICK_ROTATE_THRESHOLD) {
 462                                 set_joystick(1, 0, -1, -1, -1);
 463                                 joystick_set_x = 1;
 464                         }
 465                         /* pitch craft */
 466                         if (stick_right_y > STICK_WALK_THRESHOLD) {
 467                                 set_joystick(-1, -1, 1, 0, -1);
 468                                 joystick_set_y = 1;
 469                         } else
 470                         if (stick_right_y < -STICK_WALK_THRESHOLD) {
 471                                 set_joystick(-1, -1, 0, 1, -1);
 472                                 joystick_set_y = 1;
 473                         }
 474                         if (joystick_set_x || joystick_set_y) {
 475                                 mercenary_vr_move(0, NULL, NULL,
 476                                         256,
 477                                         (int)(256.0 * fabs(stick_right_y) - STICK_WALK_THRESHOLD / (1.0 - STICK_WALK_THRESHOLD) + 0.5));
 478                         }
 479                 } else {
 480                         double roll, pitch, yaw;
 481                         double dist, dir, east, north;
 482                         int32_t move_east[4], move_north[4];
 483
 484                         /* check if we push the stick */
 485                         dist = sqrt(stick_right_x * stick_right_x + stick_right_y * stick_right_y);
 486                         if (dist > STICK_WALK_THRESHOLD) {
 487                                 /* get stick amplitude (dist) and direction (dir) */
 488                                 if (dist > 1.0)
 489                                         dist = 1.0;
 490                                 dist = (dist - STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 491                                 dir = atan2(stick_right_x, stick_right_y);
 492                                 /* use hand direction to get actual stick direction */
 493                                 dir = fmod(dir - hand_right_yaw, M_PI * 2.0);
 494                                 if (dir < -M_PI)
 495                                         dir += M_PI * 2.0;
 496                                 if (dir > M_PI)
 497                                         dir -= M_PI * 2.0;
 498                                 /* flip directin, if we walk backwards */
 499                                 if (dir > M_PI / 2.0 || dir < -M_PI / 2.0) {
 500                                         /* go backwards */
 501                                         set_joystick(-1, -1, 0, 1, -1);
 502                                         joystick_set_y = 1;
 503                                 } else {
 504                                         /* go forward */
 505                                         set_joystick(-1, -1, 1, 0, -1);
 506                                         joystick_set_y = 1;
 507                                 }
 508                                 joystick_set_y = 1;
 509                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 510                                 east = sin(yaw - dir + M_PI) * dist;
 511                                 north = -cos(yaw - dir + M_PI) * dist;
 512                                 /* calculatate the integer positions of 4 steps */
 513                                 move_east[0] = (int32_t)((east * 0.25) + 0.5);
 514                                 move_north[0] = (int32_t)((north * 0.25) + 0.5);
 515                                 move_east[1] = (int32_t)((east * 0.5) + 0.5);
 516                                 move_north[1] = (int32_t)((north * 0.5) + 0.5);
 517                                 move_east[2] = (int32_t)((east * 0.75) + 0.5);
 518                                 move_north[2] = (int32_t)((north * 0.75) + 0.5);
 519                                 move_east[3] = (int32_t)(east + 0.5);
 520                                 move_north[3] = (int32_t)(north + 0.5);
 521                                 /* calculate the delta between each of the 4 step */
 522                                 move_east[3] -= move_east[2];
 523                                 move_north[3] -= move_north[2];
 524                                 move_east[2] -= move_east[1];
 525                                 move_north[2] -= move_north[1];
 526                                 move_east[1] -= move_east[0];
 527                                 move_north[1] -= move_north[0];
 528                                 /* the game takes 4 steps to move the player */
 529                                 mercenary_vr_move(1, move_east, move_north, 256, 256);
 530                         }
 531                 }
 532                 if (joystick_set_x_last && !joystick_set_x)
 533                         set_joystick(0, 0, -1, -1, -1);
 534                 if (joystick_set_y_last && !joystick_set_y)
 535                         set_joystick(-1, -1, 0, 0, -1);
 536                 /* thrust */
 537                 /* button to toggle between stop and escape */
 538                 if (button_left_thumb && !button_left_thumb_last) {
 539                         /* 'escape' pressed */
 540                         if (thrust_last != -99)
 541                                 thrust = -99;
 542                         else
 543                                 thrust = 0;
 544                 }
 545                 /* button to stop */
 546                 if (button_left_trigger && !button_left_trigger_last) {
 547                         /* 'stop' pressed */
 548                         thrust = 0;
 549                 }
 550                 /* get stick to increment or decrement thrust */
 551                 if (stick_left_y > STICK_THRUST_THRESHOLD)
 552                         increment = (stick_left_y - STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 553                 else
 554                 if (stick_left_y < -STICK_THRUST_THRESHOLD)
 555                         increment = (stick_left_y + STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 556                 else
 557                         increment = 0;
 558                 current_time = ticks_sdl();
 559                 if (increment) {
 560                         diff = current_time - last_time;
 561                         inc_count += increment * diff;
 562                         /* if we are in 'escape' mode, we stop thrust first */
 563                         if (thrust == -99)
 564                                 thrust = 0;
 565                         if (inc_count > 150.0 && thrust >= -10 && thrust < 10) {
 566                                 thrust++;
 567                                 inc_count = 0.0;
 568                         }
 569                         if (inc_count < -150.0 && thrust <= 10 && thrust > -10) {
 570                                 thrust--;
 571                                 inc_count = 0.0;
 572                         }
 573                 } else {
 574                         inc_count = 0;
 575                 }
 576                 last_time = current_time;
 577                 /* send thrust change as keycodes */
 578                 if (thrust_last != thrust) {
 579                         /* if we were in escape mode, we stop us first and then apply the new code */
 580                         if (thrust_last == -99) {
 581                                 set_amiga_key(KEYCODE_SPACE, 1);
 582                                 set_amiga_key(KEYCODE_SPACE, 0);
 583                         }
 584
 585                         if (thrust >= 10) {
 586                                 set_amiga_key(KEYCODE_0, 1);
 587                                 set_amiga_key(KEYCODE_0, 0);
 588                         } else
 589                         if (thrust <= -10 && thrust > -99) {
 590                                 set_amiga_key(KEYCODE_F10, 1);
 591                                 set_amiga_key(KEYCODE_F10, 0);
 592                         } else
 593                         if (thrust <= -99) {
 594                                 set_amiga_key(KEYCODE_ESCAPE, 1);
 595                                 set_amiga_key(KEYCODE_ESCAPE, 0);
 596                         } else
 597                         if (thrust > 0) {
 598                                 set_amiga_key(KEYCODE_1 + thrust - 1, 1);
 599                                 set_amiga_key(KEYCODE_1 + thrust - 1, 0);
 600                         } else
 601                         if (thrust < 0) {
 602                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 1);
 603                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 0);
 604                         } else {
 605                                 set_amiga_key(KEYCODE_SPACE, 1);
 606                                 set_amiga_key(KEYCODE_SPACE, 0);
 607                         }
 608                 }
 609         }
 610         button_a_last = button_a;
 611         button_b_last = button_b;
 612         button_x_last = button_x;
 613         button_y_last = button_y;
 614         button_menu_last = button_menu;
 615         button_left_trigger_last = button_left_trigger;
 616         button_right_trigger_last = button_right_trigger;
 617         button_left_thumb_last = button_left_thumb;
 618         button_right_thumb_last = button_right_thumb;
 619         stick_left_x_last = stick_left_x;
 620         stick_left_y_last = stick_left_y;
 621         stick_right_x_last = stick_right_x;
 622         stick_right_y_last = stick_right_y;
 623         thrust_last = thrust;
 624         joystick_set_x_last = joystick_set_x;
 625         joystick_set_y_last = joystick_set_y;
 626
 627         /* we must handle keyboard after toggeling keyboard_on,
 628          * so that keyboard_on will not change until keyboard is rendered */
 629         vr_key = 0;
 630         keyboard_on = handle_vr_keyboard(hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 631 }
 632 #endif
 633
 634 static void skip_intro(void)
 635 {
 636         int event;
 637         double render_delay = 0.0;
 638         double cycle_count;
 639
 640         if (intro_skipped)
 641                 return;
 642
 643         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 644         do {
 645                 /* render, if not delayed */
 646                 if (render_delay <= 0.0) {
 647                         cycle_count = 0;
 648                         do {
 649                                 cycle_count += execute_cpu(0, &event);
 650                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 651                         render_delay += (double)cycle_count / CPU_SPEED;
 652                 }
 653                 /* VBL */
 654                 execute_cpu(3, NULL);
 655                 /* count down render delay */
 656                 if (render_delay) {
 657                         render_delay -= 1.0 / (double)IRQ_RATE;
 658                         if (render_delay < 0.0)
 659                                 render_delay = 0.0;
 660                 }
 661         } while (event != STOP_AT_CLEAR_SCREEN1);
 662
 663         intro_skipped = 1;
 664 }
 665
 666 static void special_event(int event)
 667 {
 668 #ifdef HAVE_OVR
 669         /* handle VR events */
 670         if (event == STOP_AT_PATCH_VR) {
 671                 mercenary_patch_vr();
 672                 return;
 673         }
 674 #endif
 675         /* handle events to improve rendering */
 676         if (render_improved)
 677                 render_capture_event(event);
 678 }
 679
 680 static void main_loop(void)
 681 {
 682         double frame_step, frame_time = 0.0, frame_render = 1;
 683         int had_first_irq = 0;
 684         static uint32_t current_time, last_time = 0, diff;
 685         int i, rc;
 686         int space, length;
 687         int cycle_count, event = STOP_AT_END;
 688         double render_delay = 0.0;
 689         uint32_t palette_address;
 690         uint16_t palette[16];
 691         int all_white = 0;
 692 #ifdef HAVE_OVR
 693         int eye;
 694         int vr = 1;
 695 #else
 696         int vr = 0;
 697 #endif
 698
 699         last_time = ticks_sdl();
 700
 701         /* render result on window */
 702         while (!quit) {
 703 #ifdef HAVE_OVR
 704                 /* get vr poses */
 705                 handle_vr_poses();
 706 #endif
 707                 /* if we are in interstellar fligt, we use 50 Hz */
 708                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 709                 /* else we use whatever frame rate the user wants */
 710                 if (render_capture_is_interstellar())
 711                         frame_step = vbl_duration * 50.0;
 712                 else if (!intro_skipped)
 713                         frame_step = vbl_duration * 10.0;
 714                 else
 715                         frame_step = vbl_duration * config_fps;
 716                 if (frame_step > 1.0)
 717                         frame_step = 1.0;
 718                 /* handle SDL events */
 719                 rc = event_sdl();
 720                 if (rc)
 721                         break;
 722
 723                 /* initialize rendering */
 724                 debug_opengl = config_debug_opengl;
 725                 benson_size = config_benson_size;
 726                 render_legacy = (!config_render) || debug_opengl;
 727                 render_improved = config_render || debug_opengl;
 728                 if (!render_improved) {
 729                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 730                         render_capture_reset();
 731                 }
 732                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 733                 /* amgia speed: don't render if we still delay */
 734                 /* non amiga speed: render if we need a new frame */
 735                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 736                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 737                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 738                 if (((frame_render && !config_amiga_speed)
 739                   || (config_amiga_speed && render_delay <= 0.0)
 740                   || event == STOP_AT_WAIT_INPUT)
 741                 && !(had_first_irq && help_view)) {
 742                         frame_render = 0;
 743                         /* start capturing for improved graphics */
 744                         if (render_improved)
 745                                 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);
 746
 747                         /* execute until the rendered image is ready (wait for VBL) */
 748                         cycle_count = 0;
 749                         do {
 750                                 cycle_count += execute_cpu(0, &event);
 751                                 /* handle special events */
 752                                 special_event(event);
 753                                 if (event == STOP_AT_CLEAR_SCREEN1)
 754                                         intro_skipped = 1;
 755                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 756                         /* stop capturing for improved graphics */
 757                         if (render_improved)
 758                                 render_capture_stop();
 759                         /* copy palette */
 760                         palette_address = mercenary_palette_view();
 761                         for (i = 0; i < 16; i++)
 762                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 763                         /* for amiga speed: set delay by the number of cycles */
 764                         if (config_amiga_speed)
 765                                 render_delay += (double)cycle_count / CPU_SPEED;
 766                 }
 767
 768                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 769 #ifdef HAVE_OVR
 770                 begin_render_ovr();
 771
 772                 for (eye = 0; eye < 2; eye++) {
 773                         double camera_x, camera_y, camera_z;
 774                         /* begin of rendering eye, viewport and frustum is set here */
 775                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 776 #else
 777                 {
 778 #endif
 779                         /* clear screen */
 780                         opengl_clear(vr);
 781                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 782                         if (render_improved) {
 783 #ifndef HAVE_OVR
 784                                 /* viewport and frustum is set here */
 785                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 786 #endif
 787                                 /* render improved graphics, interpolate, if required,
 788                                  * if no item list is available, for legacy rendering
 789                                  */
 790                                 if (all_white)
 791                                         rc = render_all_white(vr);
 792                                 else
 793                                         rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, vr);
 794                                 if (rc)
 795                                         goto goto_legacy;
 796                                 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);
 797                                 if (help_view)
 798                                         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);
 799                                 if (osd_timer) {
 800                                         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);
 801                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 802                                                 osd_timer = 0;
 803                                 }
 804                         }
 805                         /* setup viewport for legacy image and render image, if enabled */
 806                         /* also render legacy, if render_improved failed due to not (yet) available items */
 807                         if (render_legacy) {
 808                                 goto_legacy:
 809                                 /* render game view without benson
 810                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 811                                  */
 812                                 if (had_first_irq)
 813                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 814 #ifndef HAVE_OVR
 815                                 /* viewport and frustum is set here */
 816                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, 1.0);
 817 #endif
 818                                 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);
 819                                 if (help_view)
 820                                         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);
 821                                 if (osd_timer) {
 822                                         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);
 823                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 824                                                 osd_timer = 0;
 825                                 }
 826                         }
 827 #ifdef HAVE_OVR
 828                         /* render keyboard */
 829                         if (keyboard_on)
 830                                 render_vr_keyboard(camera_x, camera_y);
 831
 832                         /* end of rendering eye */
 833                         end_render_ovr_eye(eye);
 834                 }
 835                 /* at this point we are ready with our image, so we display */
 836                 end_render_ovr();
 837                 render_mirror_ovr(window_width, window_height);
 838 #else
 839                 }
 840 #endif
 841                 swap_sdl();
 842
 843                 /* advance frame time, if we are not in help view  */
 844                 if (!(had_first_irq && help_view)) {
 845                         frame_time += frame_step;
 846                         if (frame_time >= 1.0) {
 847                                 frame_time -= 1.0;
 848                                 frame_render = 1;
 849                         }
 850                 }
 851
 852                 /* measure frame rate */
 853                 framerate_measure();
 854
 855                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 856                 /* only do this, if we are not in help view */
 857                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 858                 if (!(had_first_irq && help_view)) {
 859                         current_time = ticks_sdl();
 860                         diff = current_time - last_time;
 861                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 862                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 863                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 864                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 865                         }
 866                         while (diff > 1000 / IRQ_RATE) {
 867                                 /* trigger and execute IRQ 3 = VBL */
 868                                 execute_cpu(3, NULL);
 869                                 had_first_irq = 1;
 870                                 /* transfer benson without game view
 871                                  * because we only got benson refreshed during VBL IRQ
 872                                  */
 873                                 all_white = emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 874                                 /* render sound to sound buffer
 875                                  * buffer pointer read and write is atomic, so no locking required!
 876                                  */
 877                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 878                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 879 #ifdef DEBUG_SOUND_BUFFERING
 880                                         fprintf(stderr, "sound buffer overflow\n");
 881 #endif
 882                                         length = space;
 883                                 } else
 884                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 885 #ifdef DEBUG_SOUND_BUFFERING
 886                                 printf("can write %d, write %d\n", space, length);
 887                                 static int cnt = 0;
 888                                 int s;
 889                                 for (s = 0; s < length; s++) {
 890                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 891                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 892                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 893                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 894                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 895                                          cnt++;
 896                                 }
 897 #else
 898                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 899 #endif
 900                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 901                                 diff -= 1000 / IRQ_RATE;
 902                                 last_time += 1000 / IRQ_RATE;
 903
 904                                 /* count down render delay */
 905                                 if (render_delay) {
 906                                         render_delay -= 1.0 / (double)IRQ_RATE;
 907                                         if (render_delay < 0.0)
 908                                                 render_delay = 0.0;
 909                                 }
 910                         }
 911                 }
 912         }
 913 }
 914
 915 static uint16_t io_read(uint32_t address)
 916 {
 917         uint16_t value = 0xffff;
 918
 919         /* joystick and fire button */
 920         if (address == 0xbfe000 || address == 0xdff00c)
 921                 value &= emulate_joystick_read(address);
 922         /* keyboard */
 923         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 924                 value &= emulate_keyboard_read(address);
 925         /* diskette */
 926         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 927                 value &= emulate_disk_read(address);
 928
 929         return value;
 930 }
 931
 932 static void io_write(uint32_t address, uint16_t value)
 933 {
 934         /* dmacon and sound registers */
 935         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 936                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 937         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 938                 emulate_disk_write(address, value);
 939 }
 940
 941 /* two tracks with 0x1820 words of length */
 942 static uint8_t game_save[2][0x1820 << 1];
 943 static int last_track = 0;
 944
 945 /* game reads track with saved game */
 946 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 947 {
 948         if (length > sizeof(game_save[0])) {
 949                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 950                 return;
 951         }
 952
 953         /* if even track is selected, load game */
 954         if (!(track & 1)) {
 955                 char filename[256];
 956                 int gamesave_num = (track - 2) >> 1;
 957
 958                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 959
 960                 if (mission_disk == 0) {
 961                         int got;
 962                         FILE *fp;
 963
 964 #if defined(_WIN32)
 965                         filename[0] = '\0';
 966 #else
 967                         sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 968                         mkdir(filename, 0777);
 969 #endif
 970                         sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 971                         fp = fopen(filename, "r");
 972                         if (!fp) {
 973 fail:
 974                                 print_info("failed to load game from '%s'\n", filename);
 975                                 osd_info("load game", "FAILED!");
 976                                 goto copy;
 977                         }
 978                         got = fread(game_save, sizeof(game_save[0]), 2, fp);
 979                         fclose(fp);
 980                         if (got != 2)
 981                                 goto fail;
 982                         sprintf(filename, "#%d", gamesave_num);
 983                         osd_info("loaded game", filename);
 984                 } else {
 985                         const uint8_t *mission_data = get_mission_disk(mission_disk, gamesave_num);
 986                         sprintf(filename, "disk %d #%d", mission_disk, gamesave_num);
 987                         if (!mission_data) {
 988                                 print_info("failed to load mission %s\n", filename);
 989                                 osd_info("load mission", "FAILED!");
 990                                 goto copy;
 991                         }
 992                         memcpy(game_save, mission_data, 0x1820 << 2);
 993                         osd_info("loaded mission", filename);
 994                 }
 995         }
 996
 997 copy:
 998         /* copy track */
 999         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
1000 }
1001
1002 /* game writes track with saved game */
1003 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
1004 {
1005         /* cannot save on mission disk */
1006         if (mission_disk) {
1007                 osd_info("", "not applicable");
1008                 return;
1009         }
1010
1011         /* skip sync info that is provided by game and only relevant for a real disk track */
1012         data += 0x200;
1013         length -= 0x200;
1014
1015         if (length != sizeof(game_save[0])) {
1016                 print_error("saving game state failed, because length of data does not match, please fix!\n");
1017                 return;
1018         }
1019
1020         /* don't save if last track is the same, because disk is written on both sides with the same data */
1021         if (track == last_track) {
1022                 if (memcmp(memory + data, game_save[track & 1], length)) {
1023                         print_error("saving game data on other side of the disk is different, please fix!\n");
1024                 }
1025                 return;
1026         }
1027         last_track = track;
1028
1029         /* save game data */
1030         memcpy(game_save[track & 1], memory + data, length);
1031
1032         /* if done with saving */
1033         if ((track & 1)) {
1034                 char filename[256];
1035                 int gamesave_num = (track - 2) >> 1;
1036                 int wrote;
1037                 FILE *fp;
1038
1039 #if defined(_WIN32)
1040                 filename[0] = '\0';
1041 #else
1042                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
1043                 mkdir(filename, 0777);
1044 #endif
1045                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
1046                 fp = fopen(filename, "w");
1047                 if (!fp) {
1048 fail:
1049                         print_error("failed to save game to '%s'\n", filename);
1050                         osd_info("save game", "FAILED!");
1051                         return;
1052                 }
1053                 print_info("Game state saved to '%s'\n", filename);
1054                 sprintf(filename, "#%d", gamesave_num);
1055                 osd_info("saved game", filename);
1056                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
1057                 fclose(fp);
1058                 if (wrote != 2)
1059                         goto fail;
1060         }
1061 }
1062
1063 static int shift = 0, ctrl = 0, alt = 0;
1064
1065 static void keyboard_sdl(int down, enum keycode keycode)
1066 {
1067         switch (keycode) {
1068         case KEYCODE_LCTRL:
1069         case KEYCODE_RCTRL:
1070                 ctrl = down;
1071                 break;
1072         default: break;
1073         }
1074
1075         if (ctrl && down) {
1076                 switch (keycode) {
1077                 case KEYCODE_h:
1078                         toggle_help();
1079                         break;
1080                 case KEYCODE_v:
1081                         config_video_filter ^= 1;
1082                         osd_info("video filter", (config_video_filter) ? "on" : "off");
1083                         break;
1084                 case KEYCODE_a:
1085                         config_audio_filter ^= 1;
1086                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
1087                         break;
1088                 case KEYCODE_s:
1089                         config_amiga_speed ^= 1;
1090                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
1091                         break;
1092                 case KEYCODE_r:
1093                         config_render ^= 1;
1094                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
1095                         break;
1096                 case KEYCODE_b:
1097                         if (!config_render && !config_debug_opengl) {
1098                                 osd_info("", "not applicable");
1099                                 break;
1100                         }
1101                         if (config_benson_size == 0.5) {
1102                                 config_benson_size = 1.0;
1103                                 config_fov = FOV_NOVAGEN;
1104                         } else {
1105                                 config_benson_size = 0.5;
1106                                 config_fov = FOV_JOLLY;
1107                         }
1108                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
1109                         break;
1110                 case KEYCODE_i:
1111                         if (!intro_skipped)
1112                                 skip_intro();
1113                         else
1114                                 osd_info("", "not applicable");
1115                         break;
1116                 case KEYCODE_1:
1117                         if (get_mission_disk(1, 1)) { /* just to check support */
1118                                 mission_disk = 1;
1119                                 osd_info("mission disk", "insert 1");
1120                         } else
1121                                 osd_info("", "not applicable");
1122                         break;
1123                 case KEYCODE_2:
1124                         if (get_mission_disk(2, 1)) { /* just to check support */
1125                                 mission_disk = 2;
1126                                 osd_info("mission disk", "insert 2");
1127                         } else
1128                                 osd_info("", "not applicable");
1129                         break;
1130                 case KEYCODE_0:
1131                         if (get_mission_disk(1, 1)) { /* just to check support */
1132                                 mission_disk = 0;
1133                                 osd_info("mission disk", "removed");
1134                         } else
1135                                 osd_info("", "not applicable");
1136                         break;
1137                 case KEYCODE_c:
1138                         if (config_ctrl_c)
1139                                 quit = 1;
1140                         break;
1141                 case KEYCODE_o:
1142 #ifdef HAVE_OVR
1143                         reset_observer_ovr();
1144                         osd_info("", "reset observer");
1145 #else
1146                         osd_info("", "not applicable");
1147 #endif
1148                         break;
1149                 case KEYCODE_KP_PLUS:
1150 #ifdef HAVE_OVR
1151                         osd_info("", "not applicable");
1152 #else
1153                         if (config_fov / 1.2 >= FOV_MIN)
1154                                 config_fov /= 1.2;
1155                         disp_fov:
1156                         {
1157                                 char text[16];
1158                                 sprintf(text, "%.2f", config_fov);
1159                                 osd_info("FOV", text);
1160                         }
1161 #endif
1162                         break;
1163                 case KEYCODE_KP_MINUS:
1164 #ifdef HAVE_OVR
1165                         osd_info("", "not applicable");
1166 #else
1167                         if (config_fov * 1.2 <= FOV_MAX)
1168                                 config_fov *= 1.2;
1169                         goto disp_fov;
1170 #endif
1171                         break;
1172                 default: break;
1173                 }
1174                 /* do not pass keys to game while holding CTRL */
1175                 return;
1176         }
1177
1178         if (help_view == 1 && down) {
1179                 help_view = 2;
1180                 return;
1181         }
1182
1183         if (keycode == KEYCODE_PAUSE && down) {
1184                 toggle_help();
1185                 return;
1186         }
1187
1188         /* in help view we must not forward keypresses */
1189         if (help_view)
1190                 return;
1191
1192         switch (keycode) {
1193         case KEYCODE_LSHIFT:
1194                 set_amiga_key(keycode, down);
1195                 shift = down;
1196                 break;
1197         case KEYCODE_RSHIFT:
1198                 set_amiga_key(keycode, down);
1199                 shift = down;
1200                 break;
1201         case KEYCODE_LALT:
1202                 set_amiga_key(keycode, down);
1203                 alt = down;
1204                 break;
1205         case KEYCODE_RALT:
1206                 set_amiga_key(keycode, down);
1207                 alt = down;
1208                 break;
1209         case KEYCODE_LEFT:
1210                 if (shift && down) {
1211                         set_amiga_key(keycode, down);
1212                         set_joystick(-1, -1, -1, -1, -1);
1213                         break;
1214                 }
1215                 set_amiga_key(keycode, 0);
1216                 set_joystick(down, -1, -1, -1, -1);
1217                 break;
1218         case KEYCODE_RIGHT:
1219                 if (shift && down) {
1220                         set_amiga_key(keycode, down);
1221                         set_joystick(-1, -1, -1, -1, -1);
1222                         break;
1223                 }
1224                 set_amiga_key(keycode, 0);
1225                 set_joystick(-1, down, -1, -1, -1);
1226                 break;
1227         case KEYCODE_UP:
1228                 if (shift && down) {
1229                         set_amiga_key(keycode, down);
1230                         set_joystick(-1, -1, -1, -1, -1);
1231                         break;
1232                 }
1233                 set_amiga_key(keycode, 0);
1234                 if (!alt || down)
1235                         set_joystick(-1, -1, down, 0, -1);
1236                 break;
1237         case KEYCODE_DOWN:
1238                 if (shift && down) {
1239                         set_amiga_key(keycode, down);
1240                         set_joystick(-1, -1, -1, -1, -1);
1241                         break;
1242                 }
1243                 set_amiga_key(keycode, 0);
1244                 if (!alt || down)
1245                         set_joystick(-1, -1, 0, down, -1);
1246                 break;
1247         case KEYCODE_END:
1248                 set_joystick(-1, -1, -1, -1, down);
1249                 break;
1250         case KEYCODE_INSERT:
1251                 set_amiga_key(KEYCODE_HELP, down);
1252                 break;
1253         default:
1254                 set_amiga_key(keycode, down);
1255         }
1256 }
1257
1258 void audio_sdl(float *data, int length)
1259 {
1260         int fill, s;
1261
1262         /* read sound from sound buffer
1263          * buffer pointer read and write is atomic, so no locking required!
1264          */
1265         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1266         if (fill < length) {
1267 #ifdef DEBUG_SOUND_BUFFERING
1268                 fprintf(stderr, "sound buffer underrun\n");
1269 #endif
1270                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1271                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1272         }
1273         for (s = 0; s < length; s++) {
1274                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1275                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1276         }
1277 #ifdef DEBUG_SOUND_BUFFERING
1278         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1279 #endif
1280         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1281 }
1282
1283 /* used for geier counter */
1284 void sound_irq(void)
1285 {
1286         /* trigger and execute IRQ 4 = sound */
1287         execute_cpu(4, NULL);
1288 }
1289
1290 extern uint8_t mercenary_splash_palette[][3];
1291 extern char mercenary_splash_pixels[];
1292
1293 int main(int argc, char *argv[])
1294 {
1295         int rc;
1296         int sdl_sound_chunk;
1297
1298         home_dir = getenv("HOME");
1299         if (!home_dir)
1300                 home_dir = "";
1301
1302         rc = parse_args(argc, argv);
1303         if (rc)
1304                 return 0;
1305
1306         /* allocate image */
1307         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1308         if (!image) {
1309                 print_error("Failed to allocate image buffer\n");
1310                 goto done;
1311         }
1312
1313         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1314                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1315                 goto done;
1316         }
1317         if ((1000 % IRQ_RATE)) {
1318                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1319                 goto done;
1320         }
1321
1322         /* calculate SDL chunk size for audio
1323          * it must be a power of two, but not more than the chunk size for each IRQ!
1324          */
1325         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1326                 ;
1327         sdl_sound_chunk >>= 1;
1328 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1329
1330         /* allocate sound buffers */
1331         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1332         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1333         if (!sound_buffer) {
1334                 print_error("Failed to allocate image buffer\n");
1335                 goto done;
1336         }
1337
1338         /* allocate memory */
1339         memory = calloc(MEMORY_SIZE, 1);
1340         if (!memory) {
1341                 print_error("Failed to allocate cpu's memory\n");
1342                 goto done;
1343         }
1344         stop_event = calloc(MEMORY_SIZE, 1);
1345         if (!stop_event) {
1346                 print_error("Failed to allocate cpu's stop_event memory\n");
1347                 goto done;
1348         }
1349         chipreg = calloc(IOSIZE, 1);
1350         if (!chipreg) {
1351                 print_error("Failed to allocate chip register\n");
1352                 goto done;
1353         }
1354
1355         /* init cpu code */
1356         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1357
1358         /* init disk emulation */
1359         disk_init(disk_read, disk_write);
1360
1361         /* load binary */
1362         mercenary_load();
1363
1364         /* patch some stuff */
1365         mercenary_patch();
1366
1367         /* init SDL and OpenGL */
1368 #ifdef HAVE_OVR
1369         int vbl_sync = 0;
1370         int vr = 1;
1371         int multisampling = 0;
1372         window_width = SCREEN_WIDTH;
1373         window_height = SCREEN_HEIGHT;
1374 #else
1375         int vbl_sync = 1;
1376         int vr = 0;
1377         int multisampling = config_multisampling;
1378         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1379         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1380 #endif
1381         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, multisampling, vbl_sync, vr);
1382         if (rc < 0)
1383                 goto done;
1384 #ifdef HAVE_OVR
1385         rc = init_ovr(config_multisampling);
1386         if (rc < 0)
1387                 goto done;
1388         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1389         if (rc < 0)
1390                 goto done;
1391 #endif
1392         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1393         if (rc < 0)
1394                 goto done;
1395
1396         /* init osd */
1397         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1398         if (rc < 0)
1399                 goto done;
1400         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1401         if (rc < 0)
1402                 goto done;
1403         help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, 0x00);
1404         if (!help_osd[0])
1405                 goto done;
1406         text_insert_image(help_osd[0], mercenary_splash_palette, mercenary_splash_pixels, 0xff);
1407         help_views++;
1408         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1409         if (!help_osd[1])
1410                 goto done;
1411         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);
1412         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1413                 "Emulation:\n"
1414                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1415                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1416                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1417                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1418                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1419                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1420                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1421                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1422                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1423                 "        Press `CTRL' + `1' or `2' to insert or `0' to remove mission disk.\n"
1424 #ifdef HAVE_OVR
1425                 "        Press `CTRL' + `O' (or both triggers) to reset observer position.\n"
1426 #endif
1427                 "\n"
1428                 "Answer to a Question:\n"
1429                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1430                 "\n"
1431                 "Walking / Driving / Flying:\n"
1432                 "        Use cursor keys as joystick, to move player / craft.\n"
1433                 "        Press `R' for running, 'W' for walking speed.\n"
1434                 "        Press `B' to board, `L' to leave.\n"
1435                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1436                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1437                 "        Press `SPACE' to stop craft.\n"
1438                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1439                 "        Press `T' for turbo on certain craft.\n"
1440                 "        Press `END' as joystick's fire button.\n"
1441                 "\n"
1442                 "Elevator:\n"
1443                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1444                 "\n"
1445                 "Inside a transporter:\n"
1446                 "        Press `1'...`0' to select destination.\n"
1447                 "\n"
1448                 "Items:\n"
1449                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1450                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1451                 "        Press `NUMPAD Enter' to select certain items.\n"
1452                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1453                 "        Press `NUMPAD *' to read entry\n"
1454                 "Saving / Loading / Pause:\n"
1455                 "        Press `INSERT' to loading and saving options.\n"
1456                 "        Press `ENTER' to pause game, other key to continue.\n"
1457                 ,HELP_ALPHA, 1, 2, 5, 0);
1458                 help_views++;
1459 #ifdef HAVE_OVR
1460         help_osd[2] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1461         if (!help_osd[2])
1462                 goto done;
1463         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);
1464         text_render(help_osd[2], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1465                 "Emulation using Controller:\n"
1466                 "        Press `Enter' button to toggle this help screen on or off.\n"
1467                 "        To have a virtual keyboard, point below benson (control pannel).\n"
1468                 "        Point to a key on keyboard. The key will highlight.\n"
1469                 "        Pull `Trigger' on right controller to enter the highlighted key.\n"
1470                 "        Press thumb stick on left controller to reset observer position.\n"
1471                 "\n"
1472                 "Walking / Driving / Flying using Controller:\n"
1473                 "        Use thumb stick on right controller, to move player / craft.\n"
1474                 "        Point right controller towards the direction to walk to.\n"
1475                 "        Pull `Trigger' on right controller to change orientation.\n"
1476                 "        Press `X' button to board, `Y' button to leave.\n"
1477                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1478                 "        Pull `Trigger' on left controller stop craft.\n"
1479                 "        Press thumb stick on left controller for escape sequence and stop it.\n"
1480                 "        Pull `Trigger' on right controller to fire.\n"
1481                 "\n"
1482                 "For all other game function, use the virtual or real keyboard!\n"
1483                 ,HELP_ALPHA, 1, 2, 5, 0);
1484                 help_views++;
1485 #endif
1486         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1487         if (!info_osd)
1488                 goto done;
1489
1490         /* init audio */
1491         sound_init(SOUND_SAMPLERATE, sound_irq);
1492
1493         /* start cpu */
1494         reset_cpu();
1495
1496         if (config_skip_intro)
1497                 skip_intro();
1498
1499         /* run game */
1500         main_loop();
1501
1502 done:
1503         exit_opengl();
1504 #ifdef HAVE_OVR
1505         exit_ovr();
1506 #endif
1507         exit_sdl();
1508
1509         if (chipreg)
1510                 free(chipreg);
1511         if (stop_event)
1512                 free(stop_event);
1513         if (memory)
1514                 free(memory);
1515         if (sound_buffer)
1516                 free(sound_buffer);
1517         if (image)
1518                 free(image);
1519         while (help_views) {
1520                 help_views--;
1521                 if (help_osd[help_views])
1522                         free(help_osd[help_views]);
1523         }
1524         if (info_osd)
1525                 free(info_osd);
1526
1527         return 0;
1528 }
1529