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 = 0.7;
  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
 390 static void handle_vr_poses(void)
 391 {
 392         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;
 393         double hand_right_x = 0.0, hand_right_y = 0.0, hand_right_z = 0.0;
 394         double hand_right_yaw = 0.0, hand_right_pitch = 0.0, hand_right_roll = 0.0;
 395         double head_yaw = 0.0, head_pitch = 0.0, head_roll = 0.0;
 396         double stick_left_x = 0.0, stick_left_y = 0.0, stick_right_x = 0.0, stick_right_y = 0.0;
 397         int thrust = thrust_last;
 398         int joystick_set_x = 0, joystick_set_y = 0;
 399         static uint32_t current_time, last_time = 0, diff;
 400         static double increment, inc_count = 0.0;
 401
 402         /* handle input */
 403         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);
 404         if (button_menu && !button_menu_last) {
 405                 /* menu toggle */
 406                 toggle_help();
 407         }
 408         if (button_right_thumb) {
 409                 /* reset observer */
 410                 reset_observer_ovr();
 411                 osd_info("", "reset observer");
 412         }
 413         if (!help_view) {
 414                 if (button_x && !button_x_last) {
 415                         /* 'board' pressed */
 416                         set_amiga_key(KEYCODE_b, 1);
 417                         set_amiga_key(KEYCODE_b, 0);
 418                         /* important: get rid of old state */
 419                         thrust = 0;
 420                 }
 421                 if (button_y && !button_y_last) {
 422                         /* 'leave' pressed */
 423                         set_amiga_key(KEYCODE_l, 1);
 424                         set_amiga_key(KEYCODE_l, 0);
 425                 }
 426                 if (button_right_trigger && !button_right_trigger_last) {
 427                         /* trigger pressed */
 428                         if (keyboard_on) {
 429                                 if (vr_key) {
 430                                         vr_key_pressed = vr_key;
 431                                         set_amiga_key(vr_key_pressed, 1);
 432                                 }
 433                         } else
 434                         if (mercenary_get_info_walking()) {
 435                                 /* change orientation */
 436                                 double roll, pitch, yaw;
 437                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 438                                 mercenary_set_orientation(yaw + hand_right_yaw);
 439                         } else {
 440                                 /* fire button */
 441                                 set_joystick(-1, -1, -1, -1, 1);
 442                         }
 443                 }
 444                 if (!button_right_trigger && button_right_trigger_last) {
 445                         /* trigger released */
 446                         set_joystick(-1, -1, -1, -1, 0);
 447                         if (vr_key_pressed) {
 448                                 set_amiga_key(vr_key_pressed, 0);
 449                                 vr_key_pressed = 0;
 450                         }
 451                 }
 452                 /* joystick */
 453                 /* reset moving state, so the game is not influenced before we want to */
 454                 mercenary_vr_move(0, NULL, NULL, 256, 256);
 455                 joystick_set_x = 0;
 456                 joystick_set_y = 0;
 457                 if (!mercenary_get_info_walking()) {
 458                         /* turn right and left when not walking */
 459                         if (stick_right_x > STICK_ROTATE_THRESHOLD) {
 460                                 set_joystick(0, 1, -1, -1, -1);
 461                                 joystick_set_x = 1;
 462                         } else
 463                         if (stick_right_x < -STICK_ROTATE_THRESHOLD) {
 464                                 set_joystick(1, 0, -1, -1, -1);
 465                                 joystick_set_x = 1;
 466                         }
 467                         /* pitch craft */
 468                         if (stick_right_y > STICK_WALK_THRESHOLD) {
 469                                 set_joystick(-1, -1, 1, 0, -1);
 470                                 joystick_set_y = 1;
 471                         } else
 472                         if (stick_right_y < -STICK_WALK_THRESHOLD) {
 473                                 set_joystick(-1, -1, 0, 1, -1);
 474                                 joystick_set_y = 1;
 475                         }
 476                         if (joystick_set_x || joystick_set_y) {
 477                                 mercenary_vr_move(0, NULL, NULL,
 478                                         256,
 479                                         (int)(256.0 * fabs(stick_right_y) - STICK_WALK_THRESHOLD / (1.0 - STICK_WALK_THRESHOLD) + 0.5));
 480                         }
 481                 } else {
 482                         double roll, pitch, yaw;
 483                         double dist, dir, east, north;
 484                         int32_t move_east[4], move_north[4];
 485
 486                         /* check if we push the stick */
 487                         dist = sqrt(stick_right_x * stick_right_x + stick_right_y * stick_right_y);
 488                         if (dist > STICK_WALK_THRESHOLD) {
 489                                 /* get stick amplitude (dist) and direction (dir) */
 490                                 if (dist > 1.0)
 491                                         dist = 1.0;
 492                                 dist = (dist - STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 493                                 dir = atan2(stick_right_x, stick_right_y);
 494                                 /* use hand direction to get actual stick direction */
 495                                 dir = fmod(dir - hand_right_yaw, M_PI * 2.0);
 496                                 if (dir < -M_PI)
 497                                         dir += M_PI * 2.0;
 498                                 if (dir > M_PI)
 499                                         dir -= M_PI * 2.0;
 500                                 /* flip directin, if we walk backwards */
 501                                 if (dir > M_PI / 2.0 || dir < -M_PI / 2.0) {
 502                                         /* go backwards */
 503                                         set_joystick(-1, -1, 0, 1, -1);
 504                                         joystick_set_y = 1;
 505                                 } else {
 506                                         /* go forward */
 507                                         set_joystick(-1, -1, 1, 0, -1);
 508                                         joystick_set_y = 1;
 509                                 }
 510                                 joystick_set_y = 1;
 511                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 512                                 east = sin(yaw - dir + M_PI) * dist;
 513                                 north = -cos(yaw - dir + M_PI) * dist;
 514                                 /* calculatate the integer positions of 4 steps */
 515                                 move_east[0] = (int32_t)((east * 0.25) + 0.5);
 516                                 move_north[0] = (int32_t)((north * 0.25) + 0.5);
 517                                 move_east[1] = (int32_t)((east * 0.5) + 0.5);
 518                                 move_north[1] = (int32_t)((north * 0.5) + 0.5);
 519                                 move_east[2] = (int32_t)((east * 0.75) + 0.5);
 520                                 move_north[2] = (int32_t)((north * 0.75) + 0.5);
 521                                 move_east[3] = (int32_t)(east + 0.5);
 522                                 move_north[3] = (int32_t)(north + 0.5);
 523                                 /* calculate the delta between each of the 4 step */
 524                                 move_east[3] -= move_east[2];
 525                                 move_north[3] -= move_north[2];
 526                                 move_east[2] -= move_east[1];
 527                                 move_north[2] -= move_north[1];
 528                                 move_east[1] -= move_east[0];
 529                                 move_north[1] -= move_north[0];
 530                                 /* the game takes 4 steps to move the player */
 531                                 mercenary_vr_move(1, move_east, move_north, 256, 256);
 532                         }
 533                 }
 534                 if (joystick_set_x_last && !joystick_set_x)
 535                         set_joystick(0, 0, -1, -1, -1);
 536                 if (joystick_set_y_last && !joystick_set_y)
 537                         set_joystick(-1, -1, 0, 0, -1);
 538                 /* thrust */
 539                 /* button to toggle between stop and escape */
 540                 if (button_left_thumb && !button_left_thumb_last) {
 541                         /* 'escape' pressed */
 542                         if (thrust_last != -99)
 543                                 thrust = -99;
 544                         else
 545                                 thrust = 0;
 546                 }
 547                 /* button to stop */
 548                 if (button_left_trigger && !button_left_trigger_last) {
 549                         /* 'stop' pressed */
 550                         thrust = 0;
 551                 }
 552                 /* get stick to increment or decrement thrust */
 553                 if (stick_left_y > STICK_THRUST_THRESHOLD)
 554                         increment = (stick_left_y - STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 555                 else
 556                 if (stick_left_y < -STICK_THRUST_THRESHOLD)
 557                         increment = (stick_left_y + STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 558                 else
 559                         increment = 0;
 560                 current_time = ticks_sdl();
 561                 if (increment) {
 562                         diff = current_time - last_time;
 563                         inc_count += increment * diff;
 564                         /* if we are in 'escape' mode, we stop thrust first */
 565                         if (thrust == -99)
 566                                 thrust = 0;
 567                         if (inc_count > 150.0 && thrust >= -10 && thrust < 10) {
 568                                 thrust++;
 569                                 inc_count = 0.0;
 570                         }
 571                         if (inc_count < -150.0 && thrust <= 10 && thrust > -10) {
 572                                 thrust--;
 573                                 inc_count = 0.0;
 574                         }
 575                 } else {
 576                         inc_count = 0;
 577                 }
 578                 last_time = current_time;
 579                 /* send thrust change as keycodes */
 580                 if (thrust_last != thrust) {
 581                         /* if we were in escape mode, we stop us first and then apply the new code */
 582                         if (thrust_last == -99) {
 583                                 set_amiga_key(KEYCODE_SPACE, 1);
 584                                 set_amiga_key(KEYCODE_SPACE, 0);
 585                         }
 586
 587                         if (thrust >= 10) {
 588                                 set_amiga_key(KEYCODE_0, 1);
 589                                 set_amiga_key(KEYCODE_0, 0);
 590                         } else
 591                         if (thrust <= -10 && thrust > -99) {
 592                                 set_amiga_key(KEYCODE_F10, 1);
 593                                 set_amiga_key(KEYCODE_F10, 0);
 594                         } else
 595                         if (thrust <= -99) {
 596                                 set_amiga_key(KEYCODE_ESCAPE, 1);
 597                                 set_amiga_key(KEYCODE_ESCAPE, 0);
 598                         } else
 599                         if (thrust > 0) {
 600                                 set_amiga_key(KEYCODE_1 + thrust - 1, 1);
 601                                 set_amiga_key(KEYCODE_1 + thrust - 1, 0);
 602                         } else
 603                         if (thrust < 0) {
 604                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 1);
 605                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 0);
 606                         } else {
 607                                 set_amiga_key(KEYCODE_SPACE, 1);
 608                                 set_amiga_key(KEYCODE_SPACE, 0);
 609                         }
 610                 }
 611         }
 612         button_a_last = button_a;
 613         button_b_last = button_b;
 614         button_x_last = button_x;
 615         button_y_last = button_y;
 616         button_menu_last = button_menu;
 617         button_left_trigger_last = button_left_trigger;
 618         button_right_trigger_last = button_right_trigger;
 619         button_left_thumb_last = button_left_thumb;
 620         button_right_thumb_last = button_right_thumb;
 621         stick_left_x_last = stick_left_x;
 622         stick_left_y_last = stick_left_y;
 623         stick_right_x_last = stick_right_x;
 624         stick_right_y_last = stick_right_y;
 625         thrust_last = thrust;
 626         joystick_set_x_last = joystick_set_x;
 627         joystick_set_y_last = joystick_set_y;
 628
 629         /* we must handle keyboard after toggeling keyboard_on,
 630          * so that keyboard_on will not change until keyboard is rendered */
 631         vr_key = 0;
 632         keyboard_on = handle_vr_keyboard(hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 633 }
 634 #endif
 635
 636 static void skip_intro(void)
 637 {
 638         int event;
 639         double render_delay = 0.0;
 640         double cycle_count;
 641
 642         if (intro_skipped)
 643                 return;
 644
 645         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 646         do {
 647                 /* render, if not delayed */
 648                 if (render_delay <= 0.0) {
 649                         cycle_count = 0;
 650                         do {
 651                                 cycle_count += execute_cpu(0, &event);
 652                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 653                         render_delay += (double)cycle_count / CPU_SPEED;
 654                 }
 655                 /* VBL */
 656                 execute_cpu(3, NULL);
 657                 /* count down render delay */
 658                 if (render_delay) {
 659                         render_delay -= 1.0 / (double)IRQ_RATE;
 660                         if (render_delay < 0.0)
 661                                 render_delay = 0.0;
 662                 }
 663         } while (event != STOP_AT_CLEAR_SCREEN1);
 664
 665         intro_skipped = 1;
 666 }
 667
 668 static void special_event(int event)
 669 {
 670 #ifdef HAVE_OVR
 671         /* handle VR events */
 672         if (event == STOP_AT_PATCH_VR) {
 673                 mercenary_patch_vr();
 674                 return;
 675         }
 676 #endif
 677         /* handle events to improve rendering */
 678         if (render_improved)
 679                 render_capture_event(event);
 680 }
 681
 682 static void main_loop(void)
 683 {
 684         double frame_step, frame_time = 0.0, frame_render = 1;
 685         int had_first_irq = 0;
 686         static uint32_t current_time, last_time = 0, diff;
 687         int i, rc;
 688         int space, length;
 689         int cycle_count, event = STOP_AT_END;
 690         double render_delay = 0.0;
 691         uint32_t palette_address;
 692         uint16_t palette[16];
 693         int all_white = 0;
 694 #ifdef HAVE_OVR
 695         int eye;
 696         int vr = 1;
 697 #else
 698         int vr = 0;
 699 #endif
 700
 701         last_time = ticks_sdl();
 702
 703         /* render result on window */
 704         while (!quit) {
 705 #ifdef HAVE_OVR
 706                 /* get vr poses */
 707                 handle_vr_poses();
 708 #endif
 709                 /* if we are in interstellar fligt, we use 50 Hz */
 710                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 711                 /* else we use whatever frame rate the user wants */
 712                 if (render_capture_is_interstellar())
 713                         frame_step = vbl_duration * 50.0;
 714                 else if (!intro_skipped)
 715                         frame_step = vbl_duration * 10.0;
 716                 else
 717                         frame_step = vbl_duration * config_fps;
 718                 if (frame_step > 1.0)
 719                         frame_step = 1.0;
 720                 /* handle SDL events */
 721                 rc = event_sdl();
 722                 if (rc)
 723                         break;
 724
 725                 /* initialize rendering */
 726                 debug_opengl = config_debug_opengl;
 727                 benson_size = config_benson_size;
 728                 render_legacy = (!config_render) || debug_opengl;
 729                 render_improved = config_render || debug_opengl;
 730                 if (!render_improved) {
 731                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 732                         render_capture_reset();
 733                 }
 734                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 735                 /* amgia speed: don't render if we still delay */
 736                 /* non amiga speed: render if we need a new frame */
 737                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 738                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 739                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 740                 if (((frame_render && !config_amiga_speed)
 741                   || (config_amiga_speed && render_delay <= 0.0)
 742                   || event == STOP_AT_WAIT_INPUT)
 743                 && !(had_first_irq && help_view)) {
 744                         frame_render = 0;
 745                         /* start capturing for improved graphics */
 746                         if (render_improved)
 747                                 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);
 748
 749                         /* execute until the rendered image is ready (wait for VBL) */
 750                         cycle_count = 0;
 751                         do {
 752                                 cycle_count += execute_cpu(0, &event);
 753                                 /* handle special events */
 754                                 special_event(event);
 755                                 if (event == STOP_AT_CLEAR_SCREEN1)
 756                                         intro_skipped = 1;
 757                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 758                         /* stop capturing for improved graphics */
 759                         if (render_improved)
 760                                 render_capture_stop();
 761                         /* copy palette */
 762                         palette_address = mercenary_palette_view();
 763                         for (i = 0; i < 16; i++)
 764                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 765                         /* for amiga speed: set delay by the number of cycles */
 766                         if (config_amiga_speed)
 767                                 render_delay += (double)cycle_count / CPU_SPEED;
 768                 }
 769
 770                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 771 #ifdef HAVE_OVR
 772                 begin_render_ovr();
 773
 774                 for (eye = 0; eye < 2; eye++) {
 775                         double camera_x, camera_y, camera_z;
 776                         /* begin of rendering eye, viewport and frustum is set here */
 777                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 778 #else
 779                 {
 780 #endif
 781                         /* clear screen */
 782                         opengl_clear(vr);
 783                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 784                         if (render_improved) {
 785 #ifndef HAVE_OVR
 786                                 /* viewport and frustum is set here */
 787                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 788 #endif
 789                                 /* render improved graphics, interpolate, if required,
 790                                  * if no item list is available, for legacy rendering
 791                                  */
 792                                 if (all_white)
 793                                         rc = render_all_white(vr);
 794                                 else
 795                                         rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, vr);
 796                                 if (rc)
 797                                         goto goto_legacy;
 798                                 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);
 799                                 if (help_view)
 800                                         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);
 801                                 if (osd_timer) {
 802                                         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);
 803                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 804                                                 osd_timer = 0;
 805                                 }
 806 #ifndef HAVE_OVR
 807                                 /* draw border around legacy render area */
 808                                 if (border_timer) {
 809                                         opengl_render_color(1.0, 0.0, 0.0, 1.0);
 810                                         opengl_render_line(160, -68, 256, 160, 68, 256, 0.0);
 811                                         opengl_render_line(-160, -68, 256, -160, 68, 256, 0.0);
 812                                         opengl_render_line(-160, 68, 256, 160, 68, 256, 0.0);
 813                                         opengl_render_line(-160, -68, 256, 160, -68, 256, 0.0);
 814                                         if (border_timer - (int32_t)ticks_sdl() < 0)
 815                                                 border_timer = 0;
 816                                 }
 817 #endif
 818                         }
 819                         /* setup viewport for legacy image and render image, if enabled */
 820                         /* also render legacy, if render_improved failed due to not (yet) available items */
 821                         if (render_legacy) {
 822                                 goto_legacy:
 823                                 /* render game view without benson
 824                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 825                                  */
 826                                 if (had_first_irq)
 827                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 828 #ifndef HAVE_OVR
 829                                 /* viewport and frustum is set here */
 830                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, 1.0);
 831 #endif
 832                                 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);
 833                                 if (help_view)
 834                                         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);
 835                                 if (osd_timer) {
 836                                         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);
 837                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 838                                                 osd_timer = 0;
 839                                 }
 840                         }
 841 #ifdef HAVE_OVR
 842                         /* render keyboard */
 843                         if (keyboard_on)
 844                                 render_vr_keyboard(camera_x, camera_y);
 845
 846                         /* end of rendering eye */
 847                         end_render_ovr_eye(eye);
 848                 }
 849                 /* at this point we are ready with our image, so we display */
 850                 end_render_ovr();
 851                 render_mirror_ovr(window_width, window_height);
 852 #else
 853                 }
 854 #endif
 855                 swap_sdl();
 856
 857                 /* advance frame time, if we are not in help view  */
 858                 if (!(had_first_irq && help_view)) {
 859                         frame_time += frame_step;
 860                         if (frame_time >= 1.0) {
 861                                 frame_time -= 1.0;
 862                                 frame_render = 1;
 863                         }
 864                 }
 865
 866                 /* measure frame rate */
 867                 framerate_measure();
 868
 869                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 870                 /* only do this, if we are not in help view */
 871                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 872                 if (!(had_first_irq && help_view)) {
 873                         current_time = ticks_sdl();
 874                         diff = current_time - last_time;
 875                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 876                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 877                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 878                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 879                         }
 880                         while (diff > 1000 / IRQ_RATE) {
 881                                 /* trigger and execute IRQ 3 = VBL */
 882                                 execute_cpu(3, NULL);
 883                                 had_first_irq = 1;
 884                                 /* transfer benson without game view
 885                                  * because we only got benson refreshed during VBL IRQ
 886                                  */
 887                                 all_white = emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 888                                 /* render sound to sound buffer
 889                                  * buffer pointer read and write is atomic, so no locking required!
 890                                  */
 891                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 892                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 893 #ifdef DEBUG_SOUND_BUFFERING
 894                                         fprintf(stderr, "sound buffer overflow\n");
 895 #endif
 896                                         length = space;
 897                                 } else
 898                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 899 #ifdef DEBUG_SOUND_BUFFERING
 900                                 printf("can write %d, write %d\n", space, length);
 901                                 static int cnt = 0;
 902                                 int s;
 903                                 for (s = 0; s < length; s++) {
 904                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 905                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 906                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 907                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 908                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 909                                          cnt++;
 910                                 }
 911 #else
 912                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 913 #endif
 914                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 915                                 diff -= 1000 / IRQ_RATE;
 916                                 last_time += 1000 / IRQ_RATE;
 917
 918                                 /* count down render delay */
 919                                 if (render_delay) {
 920                                         render_delay -= 1.0 / (double)IRQ_RATE;
 921                                         if (render_delay < 0.0)
 922                                                 render_delay = 0.0;
 923                                 }
 924                         }
 925                 }
 926         }
 927 }
 928
 929 static uint16_t io_read(uint32_t address)
 930 {
 931         uint16_t value = 0xffff;
 932
 933         /* joystick and fire button */
 934         if (address == 0xbfe000 || address == 0xdff00c)
 935                 value &= emulate_joystick_read(address);
 936         /* keyboard */
 937         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 938                 value &= emulate_keyboard_read(address);
 939         /* diskette */
 940         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 941                 value &= emulate_disk_read(address);
 942
 943         return value;
 944 }
 945
 946 static void io_write(uint32_t address, uint16_t value)
 947 {
 948         /* dmacon and sound registers */
 949         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 950                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 951         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 952                 emulate_disk_write(address, value);
 953 }
 954
 955 /* two tracks with 0x1820 words of length */
 956 static uint8_t game_save[2][0x1820 << 1];
 957 static int last_track = 0;
 958
 959 /* game reads track with saved game */
 960 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 961 {
 962         if (length > sizeof(game_save[0])) {
 963                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 964                 return;
 965         }
 966
 967         /* if even track is selected, load game */
 968         if (!(track & 1)) {
 969                 char filename[256];
 970                 int gamesave_num = (track - 2) >> 1;
 971
 972                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 973
 974                 if (mission_disk == 0) {
 975                         int got;
 976                         FILE *fp;
 977
 978 #if defined(_WIN32)
 979                         filename[0] = '\0';
 980 #else
 981                         sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 982                         mkdir(filename, 0777);
 983 #endif
 984                         sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 985                         fp = fopen(filename, "r");
 986                         if (!fp) {
 987 fail:
 988                                 print_info("failed to load game from '%s'\n", filename);
 989                                 osd_info("load game", "FAILED!");
 990                                 goto copy;
 991                         }
 992                         got = fread(game_save, sizeof(game_save[0]), 2, fp);
 993                         fclose(fp);
 994                         if (got != 2)
 995                                 goto fail;
 996                         sprintf(filename, "#%d", gamesave_num);
 997                         osd_info("loaded game", filename);
 998                 } else {
 999                         const uint8_t *mission_data = get_mission_disk(mission_disk, gamesave_num);
1000                         sprintf(filename, "disk %d #%d", mission_disk, gamesave_num);
1001                         if (!mission_data) {
1002                                 print_info("failed to load mission %s\n", filename);
1003                                 osd_info("load mission", "FAILED!");
1004                                 goto copy;
1005                         }
1006                         memcpy(game_save, mission_data, 0x1820 << 2);
1007                         osd_info("loaded mission", filename);
1008                 }
1009         }
1010
1011 copy:
1012         /* copy track */
1013         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
1014 }
1015
1016 /* game writes track with saved game */
1017 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
1018 {
1019         /* cannot save on mission disk */
1020         if (mission_disk) {
1021                 osd_info("", "not applicable");
1022                 return;
1023         }
1024
1025         /* skip sync info that is provided by game and only relevant for a real disk track */
1026         data += 0x200;
1027         length -= 0x200;
1028
1029         if (length != sizeof(game_save[0])) {
1030                 print_error("saving game state failed, because length of data does not match, please fix!\n");
1031                 return;
1032         }
1033
1034         /* don't save if last track is the same, because disk is written on both sides with the same data */
1035         if (track == last_track) {
1036                 if (memcmp(memory + data, game_save[track & 1], length)) {
1037                         print_error("saving game data on other side of the disk is different, please fix!\n");
1038                 }
1039                 return;
1040         }
1041         last_track = track;
1042
1043         /* save game data */
1044         memcpy(game_save[track & 1], memory + data, length);
1045
1046         /* if done with saving */
1047         if ((track & 1)) {
1048                 char filename[256];
1049                 int gamesave_num = (track - 2) >> 1;
1050                 int wrote;
1051                 FILE *fp;
1052
1053 #if defined(_WIN32)
1054                 filename[0] = '\0';
1055 #else
1056                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
1057                 mkdir(filename, 0777);
1058 #endif
1059                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
1060                 fp = fopen(filename, "w");
1061                 if (!fp) {
1062 fail:
1063                         print_error("failed to save game to '%s'\n", filename);
1064                         osd_info("save game", "FAILED!");
1065                         return;
1066                 }
1067                 print_info("Game state saved to '%s'\n", filename);
1068                 sprintf(filename, "#%d", gamesave_num);
1069                 osd_info("saved game", filename);
1070                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
1071                 fclose(fp);
1072                 if (wrote != 2)
1073                         goto fail;
1074         }
1075 }
1076
1077 static int shift = 0, ctrl = 0, alt = 0;
1078
1079 static void keyboard_sdl(int down, enum keycode keycode)
1080 {
1081         switch (keycode) {
1082         case KEYCODE_LCTRL:
1083         case KEYCODE_RCTRL:
1084                 ctrl = down;
1085                 break;
1086         default: break;
1087         }
1088
1089         if (ctrl && down) {
1090                 switch (keycode) {
1091                 case KEYCODE_h:
1092                         toggle_help();
1093                         break;
1094                 case KEYCODE_v:
1095                         config_video_filter ^= 1;
1096                         osd_info("video filter", (config_video_filter) ? "on" : "off");
1097                         break;
1098                 case KEYCODE_a:
1099                         config_audio_filter ^= 1;
1100                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
1101                         break;
1102                 case KEYCODE_s:
1103                         config_amiga_speed ^= 1;
1104                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
1105                         break;
1106                 case KEYCODE_r:
1107                         config_render ^= 1;
1108                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
1109                         break;
1110                 case KEYCODE_b:
1111                         if (!config_render && !config_debug_opengl) {
1112                                 osd_info("", "not applicable");
1113                                 break;
1114                         }
1115                         if (config_benson_size == 0.5) {
1116                                 config_benson_size = 1.0;
1117                                 config_fov = FOV_NOVAGEN;
1118                         } else {
1119                                 config_benson_size = 0.5;
1120                                 config_fov = FOV_JOLLY;
1121                         }
1122                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
1123                         border_timer = ticks_sdl() + 1500;
1124                         break;
1125                 case KEYCODE_i:
1126                         if (!intro_skipped)
1127                                 skip_intro();
1128                         else
1129                                 osd_info("", "not applicable");
1130                         break;
1131                 case KEYCODE_1:
1132                         if (get_mission_disk(1, 1)) { /* just to check support */
1133                                 mission_disk = 1;
1134                                 osd_info("mission disk", "insert 1");
1135                         } else
1136                                 osd_info("", "not applicable");
1137                         break;
1138                 case KEYCODE_2:
1139                         if (get_mission_disk(2, 1)) { /* just to check support */
1140                                 mission_disk = 2;
1141                                 osd_info("mission disk", "insert 2");
1142                         } else
1143                                 osd_info("", "not applicable");
1144                         break;
1145                 case KEYCODE_0:
1146                         if (get_mission_disk(1, 1)) { /* just to check support */
1147                                 mission_disk = 0;
1148                                 osd_info("mission disk", "removed");
1149                         } else
1150                                 osd_info("", "not applicable");
1151                         break;
1152                 case KEYCODE_c:
1153                         if (config_ctrl_c)
1154                                 quit = 1;
1155                         break;
1156                 case KEYCODE_o:
1157 #ifdef HAVE_OVR
1158                         reset_observer_ovr();
1159                         osd_info("", "reset observer");
1160 #else
1161                         osd_info("", "not applicable");
1162 #endif
1163                         break;
1164                 case KEYCODE_KP_PLUS:
1165 #ifdef HAVE_OVR
1166                         osd_info("", "not applicable");
1167 #else
1168                         if (config_fov / 1.2 >= FOV_MIN)
1169                                 config_fov /= 1.2;
1170                         disp_fov:
1171                         {
1172                                 char text[16];
1173                                 if (config_fov < 63.5 || config_fov > 64.5)
1174                                         sprintf(text, "%.2f", config_fov);
1175                                 else
1176                                         sprintf(text, "%.2f (default)", config_fov);
1177                                 osd_info("FOV", text);
1178                                 border_timer = ticks_sdl() + 1500;
1179                         }
1180 #endif
1181                         break;
1182                 case KEYCODE_KP_MINUS:
1183 #ifdef HAVE_OVR
1184                         osd_info("", "not applicable");
1185 #else
1186                         if (config_fov * 1.2 <= FOV_MAX)
1187                                 config_fov *= 1.2;
1188                         goto disp_fov;
1189 #endif
1190                         break;
1191                 default: break;
1192                 }
1193                 /* do not pass keys to game while holding CTRL */
1194                 return;
1195         }
1196
1197         if (help_view == 1 && down) {
1198                 help_view = 2;
1199                 return;
1200         }
1201
1202         if (keycode == KEYCODE_PAUSE && down) {
1203                 toggle_help();
1204                 return;
1205         }
1206
1207         /* in help view we must not forward keypresses */
1208         if (help_view)
1209                 return;
1210
1211         switch (keycode) {
1212         case KEYCODE_LSHIFT:
1213                 set_amiga_key(keycode, down);
1214                 shift = down;
1215                 break;
1216         case KEYCODE_RSHIFT:
1217                 set_amiga_key(keycode, down);
1218                 shift = down;
1219                 break;
1220         case KEYCODE_LALT:
1221                 set_amiga_key(keycode, down);
1222                 alt = down;
1223                 break;
1224         case KEYCODE_RALT:
1225                 set_amiga_key(keycode, down);
1226                 alt = down;
1227                 break;
1228         case KEYCODE_LEFT:
1229                 if (shift && down) {
1230                         set_amiga_key(keycode, down);
1231                         set_joystick(-1, -1, -1, -1, -1);
1232                         break;
1233                 }
1234                 set_amiga_key(keycode, 0);
1235                 set_joystick(down, -1, -1, -1, -1);
1236                 break;
1237         case KEYCODE_RIGHT:
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                 set_joystick(-1, down, -1, -1, -1);
1245                 break;
1246         case KEYCODE_UP:
1247                 if (shift && down) {
1248                         set_amiga_key(keycode, down);
1249                         set_joystick(-1, -1, -1, -1, -1);
1250                         break;
1251                 }
1252                 set_amiga_key(keycode, 0);
1253                 if (!alt || down)
1254                         set_joystick(-1, -1, down, 0, -1);
1255                 break;
1256         case KEYCODE_DOWN:
1257                 if (shift && down) {
1258                         set_amiga_key(keycode, down);
1259                         set_joystick(-1, -1, -1, -1, -1);
1260                         break;
1261                 }
1262                 set_amiga_key(keycode, 0);
1263                 if (!alt || down)
1264                         set_joystick(-1, -1, 0, down, -1);
1265                 break;
1266         case KEYCODE_END:
1267                 set_joystick(-1, -1, -1, -1, down);
1268                 break;
1269         case KEYCODE_INSERT:
1270                 set_amiga_key(KEYCODE_HELP, down);
1271                 break;
1272         default:
1273                 set_amiga_key(keycode, down);
1274         }
1275 }
1276
1277 void audio_sdl(float *data, int length)
1278 {
1279         int fill, s;
1280
1281         /* read sound from sound buffer
1282          * buffer pointer read and write is atomic, so no locking required!
1283          */
1284         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1285         if (fill < length) {
1286 #ifdef DEBUG_SOUND_BUFFERING
1287                 fprintf(stderr, "sound buffer underrun\n");
1288 #endif
1289                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1290                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1291         }
1292         for (s = 0; s < length; s++) {
1293                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1294                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1295         }
1296 #ifdef DEBUG_SOUND_BUFFERING
1297         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1298 #endif
1299         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1300 }
1301
1302 /* used for geier counter */
1303 void sound_irq(void)
1304 {
1305         /* trigger and execute IRQ 4 = sound */
1306         execute_cpu(4, NULL);
1307 }
1308
1309 extern uint8_t mercenary_splash_palette[][3];
1310 extern char mercenary_splash_pixels[];
1311
1312 int main(int argc, char *argv[])
1313 {
1314         int rc;
1315         int sdl_sound_chunk;
1316
1317         home_dir = getenv("HOME");
1318         if (!home_dir)
1319                 home_dir = "";
1320
1321         rc = parse_args(argc, argv);
1322         if (rc)
1323                 return 0;
1324
1325         /* allocate image */
1326         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1327         if (!image) {
1328                 print_error("Failed to allocate image buffer\n");
1329                 goto done;
1330         }
1331
1332         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1333                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1334                 goto done;
1335         }
1336         if ((1000 % IRQ_RATE)) {
1337                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1338                 goto done;
1339         }
1340
1341         /* calculate SDL chunk size for audio
1342          * it must be a power of two, but not more than the chunk size for each IRQ!
1343          */
1344         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1345                 ;
1346         sdl_sound_chunk >>= 1;
1347 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1348
1349         /* allocate sound buffers */
1350         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1351         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1352         if (!sound_buffer) {
1353                 print_error("Failed to allocate image buffer\n");
1354                 goto done;
1355         }
1356
1357         /* allocate memory */
1358         memory = calloc(MEMORY_SIZE, 1);
1359         if (!memory) {
1360                 print_error("Failed to allocate cpu's memory\n");
1361                 goto done;
1362         }
1363         stop_event = calloc(MEMORY_SIZE, 1);
1364         if (!stop_event) {
1365                 print_error("Failed to allocate cpu's stop_event memory\n");
1366                 goto done;
1367         }
1368         chipreg = calloc(IOSIZE, 1);
1369         if (!chipreg) {
1370                 print_error("Failed to allocate chip register\n");
1371                 goto done;
1372         }
1373
1374         /* init cpu code */
1375         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1376
1377         /* init disk emulation */
1378         disk_init(disk_read, disk_write);
1379
1380         /* load binary */
1381         mercenary_load();
1382
1383         /* patch some stuff */
1384         mercenary_patch();
1385
1386         /* init SDL and OpenGL */
1387 #ifdef HAVE_OVR
1388         int vbl_sync = 0;
1389         int vr = 1;
1390         int multisampling = 0;
1391         window_width = SCREEN_WIDTH;
1392         window_height = SCREEN_HEIGHT;
1393 #else
1394         int vbl_sync = 1;
1395         int vr = 0;
1396         int multisampling = config_multisampling;
1397         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1398         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1399 #endif
1400         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, multisampling, vbl_sync, vr);
1401         if (rc < 0)
1402                 goto done;
1403 #ifdef HAVE_OVR
1404         rc = init_ovr(config_multisampling);
1405         if (rc < 0)
1406                 goto done;
1407         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1408         if (rc < 0)
1409                 goto done;
1410 #endif
1411         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1412         if (rc < 0)
1413                 goto done;
1414
1415         /* init osd */
1416         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1417         if (rc < 0)
1418                 goto done;
1419         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1420         if (rc < 0)
1421                 goto done;
1422         help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, 0x00);
1423         if (!help_osd[0])
1424                 goto done;
1425         text_insert_image(help_osd[0], mercenary_splash_palette, mercenary_splash_pixels, 0xff);
1426         help_views++;
1427         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1428         if (!help_osd[1])
1429                 goto done;
1430         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);
1431         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1432                 "Emulation:\n"
1433                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1434                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1435                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1436                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1437                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1438                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1439                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1440                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1441                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1442                 "        Press `CTRL' + `1' or `2' to insert or `0' to remove mission disk.\n"
1443 #ifdef HAVE_OVR
1444                 "        Press `CTRL' + `O' (or both triggers) to reset observer position.\n"
1445 #endif
1446                 "\n"
1447                 "Answer to a Question:\n"
1448                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1449                 "\n"
1450                 "Walking / Driving / Flying:\n"
1451                 "        Use cursor keys as joystick, to move player / craft.\n"
1452                 "        Press `R' for running, 'W' for walking speed.\n"
1453                 "        Press `B' to board, `L' to leave.\n"
1454                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1455                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1456                 "        Press `SPACE' to stop craft.\n"
1457                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1458                 "        Press `T' for turbo on certain craft.\n"
1459                 "        Press `END' as joystick's fire button.\n"
1460                 "\n"
1461                 "Elevator:\n"
1462                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1463                 "\n"
1464                 "Inside a transporter:\n"
1465                 "        Press `1'...`0' to select destination.\n"
1466                 "\n"
1467                 "Items:\n"
1468                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1469                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1470                 "        Press `NUMPAD Enter' to select certain items.\n"
1471                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1472                 "        Press `NUMPAD *' to read entry\n"
1473                 "Saving / Loading / Pause:\n"
1474                 "        Press `INSERT' to loading and saving options.\n"
1475                 "        Press `ENTER' to pause game, other key to continue.\n"
1476                 ,HELP_ALPHA, 1, 2, 5, 0);
1477                 help_views++;
1478 #ifdef HAVE_OVR
1479         help_osd[2] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1480         if (!help_osd[2])
1481                 goto done;
1482         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);
1483         text_render(help_osd[2], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1484                 "Emulation using Controller:\n"
1485                 "        Press `Enter' button to toggle this help screen on or off.\n"
1486                 "        To have a virtual keyboard, point below benson (control pannel).\n"
1487                 "        Point to a key on keyboard. The key will highlight.\n"
1488                 "        Pull `Trigger' on right controller to enter the highlighted key.\n"
1489                 "        Press thumb stick on left controller to reset observer position.\n"
1490                 "\n"
1491                 "Walking / Driving / Flying using Controller:\n"
1492                 "        Use thumb stick on right controller, to move player / craft.\n"
1493                 "        Point right controller towards the direction to walk to.\n"
1494                 "        Pull `Trigger' on right controller to change orientation.\n"
1495                 "        Press `X' button to board, `Y' button to leave.\n"
1496                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1497                 "        Pull `Trigger' on left controller stop craft.\n"
1498                 "        Press thumb stick on left controller for escape sequence and stop it.\n"
1499                 "        Pull `Trigger' on right controller to fire.\n"
1500                 "\n"
1501                 "For all other game function, use the virtual or real keyboard!\n"
1502                 ,HELP_ALPHA, 1, 2, 5, 0);
1503                 help_views++;
1504 #endif
1505         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1506         if (!info_osd)
1507                 goto done;
1508
1509         /* init audio */
1510         sound_init(SOUND_SAMPLERATE, sound_irq);
1511
1512         /* start cpu */
1513         reset_cpu();
1514
1515         if (config_skip_intro)
1516                 skip_intro();
1517
1518         /* run game */
1519         main_loop();
1520
1521 done:
1522         exit_opengl();
1523 #ifdef HAVE_OVR
1524         exit_ovr();
1525 #endif
1526         exit_sdl();
1527
1528         if (chipreg)
1529                 free(chipreg);
1530         if (stop_event)
1531                 free(stop_event);
1532         if (memory)
1533                 free(memory);
1534         if (sound_buffer)
1535                 free(sound_buffer);
1536         if (image)
1537                 free(image);
1538         while (help_views) {
1539                 help_views--;
1540                 if (help_osd[help_views])
1541                         free(help_osd[help_views]);
1542         }
1543         if (info_osd)
1544                 free(info_osd);
1545
1546         return 0;
1547 }
1548