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 "../libsdl/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 0.3 /* 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 static double config_fov = FOV_NOVAGEN;
  68 static double config_monitor_distance = 31.5; /* inch */
  69 #ifdef HAVE_OVR
  70 static double config_keyboard_distance = 28.5; /* inch */
  71 static double config_keyboard_height = 10.0; /* inch */
  72 #endif
  73 static double config_benson_size = 1.0;
  74 static int config_debug_transparent = 0;
  75 static int config_debug_opengl = 0;
  76 /* render improvements */
  77 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  78 static int config_improve_smooth_planets = 1;   /* set to 1 to rotate planets smoothly */
  79 static int config_fix_sky_rotation = 0;         /* set to 1 to fix sky rotation */
  80
  81 #define CPU_SPEED       7093790.0;
  82
  83 #define SOUND_SAMPLERATE 48000
  84 /* - game IRQ rate
  85  * - must be used for sound rendering chunk
  86  */
  87 #define IRQ_RATE        50
  88 /* numbe of buffer chunks to dejitter:
  89  * - SDL render interval
  90  * - sound rendering interval
  91  * - sound card interval
  92  * 4 should be minimum, if video rate is >=50 Hz
  93  */
  94 #define SOUND_CHUNKS    4
  95
  96 /* test sound to check if buffer does not overflow / underrun */
  97 //#define DEBUG_SOUND_BUFFERING
  98
  99 #define IOSIZE          0x1000 /* bytes in io space */
 100 #define MEMORY_SIZE     0x80000
 101 static uint8_t *memory = NULL;
 102 static uint8_t *stop_event = NULL;
 103 static uint8_t *image = NULL;
 104 static uint8_t *help_osd[2] = { NULL, NULL };
 105 static uint8_t *info_osd = NULL;
 106 static int help_view = 1;
 107 static int help_views = 1;
 108 static int32_t osd_timer = 0;
 109 #ifdef HAVE_OVR
 110 #define SCREEN_WIDTH    1344
 111 #define SCREEN_HEIGHT   800
 112 #else
 113 #define SCREEN_WIDTH    (320*3)
 114 #define SCREEN_HEIGHT   (200*3)
 115 #endif
 116 #define IMAGE_WIDTH     320
 117 #define IMAGE_HEIGHT    200
 118 #define BENSON_AT_LINE  136
 119 #define IMAGE_DIWSTART  0x2c
 120 #define HELP_ALPHA      0xd0
 121 #define OSD_WIDTH       320
 122 #define OSD_HEIGHT      16
 123 static uint16_t *chipreg = NULL;
 124 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 125 static int sound_buffer_size; /* buffer sample size */
 126 static int sound_buffer_writep; /* write pointer at buffer */
 127 static int sound_buffer_readp; /* read pointer at buffer */
 128 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 129 static double benson_size; /* render size of benson */
 130 static int render_legacy = 0; /* render original amiga screen, if set */
 131 static int render_improved = 0; /* render improved image, if set */
 132 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 133 static int intro_skipped = 0; /* indicated if we already have landed */
 134 static int window_width, window_height;
 135
 136 static const char *home_dir;
 137
 138 static int quit = 0;
 139
 140 int parse_args(int argc, char *argv[])
 141 {
 142         int i = 1;
 143
 144         while (argc > i) {
 145                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 146                         /*          |                                                                             | */
 147                         print_info("Usage: %s\n", argv[0]);
 148                         print_info(" -s --render-speed original | fast\n");
 149                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 150                         print_info("    --fps <fps>\n");
 151                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 152                         print_info(" -v --video-filter on | off\n");
 153                         print_info("        Set video filter.\n");
 154                         print_info(" -a --audio-filter on | off\n");
 155                         print_info("        Set audio filter.\n");
 156                         print_info(" -r --render original | opengl\n");
 157                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 158                         print_info(" -b --benson normal | half\n");
 159                         print_info("        Size of 'Benson' (control panel).\n");
 160                         print_info(" -m --multisampling <samples>\n");
 161                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 162                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 163                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 164                         print_info(" -i --skip-intro\n");
 165                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 166                         print_info("    --fix-sky-rotation\n");
 167                         print_info("        Sky rotates in the wrong direction, if flying over surface. This is\n");
 168                         print_info("        fixed by rotating all sky object by 180 degrees. The original (wrong)\n");
 169                         print_info("        rotation is default, because it preserves the game's spirit!\n");
 170                         print_info("        This requires OpenGL rendering\n");
 171                         print_info("Debug options:\n");
 172                         print_info(" -o --debug-opengl\n");
 173                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 174                         print_info("    --debug-transparent\n");
 175                         print_info("        Draw all things half transparent.\n");
 176                         print_info("    --ctrl-c\n");
 177                         print_info("        Use CTRL+C to exit game (used for development)\n");
 178                         return -1;
 179                 } else
 180                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 181                         i++;
 182                         if (argc == i) {
 183 missing_parameter:
 184                                 print_info("Missing parameter, use '--help'!\n");
 185                                 return -1;
 186                         }
 187                         if (!strcmp(argv[i], "original"))
 188                                 config_amiga_speed = 1;
 189                         else
 190                         if (!strcmp(argv[i], "fast"))
 191                                 config_amiga_speed = 0;
 192                         else {
 193 illegal_parameter:
 194                                 print_info("Illegal parameter, use '--help'!\n");
 195                                 return -1;
 196                         }
 197                 } else
 198                 if (!strcmp(argv[i], "--fps")) {
 199                         i++;
 200                         if (argc == i)
 201                                 goto missing_parameter;
 202                         config_fps = atof(argv[i]);
 203                         if (config_fov <= 0.0)
 204                                 goto illegal_parameter;
 205                 } else
 206                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 207                         i++;
 208                         if (argc == i)
 209                                 goto missing_parameter;
 210                         if (!strcmp(argv[i], "on"))
 211                                 config_video_filter = 1;
 212                         else
 213                         if (!strcmp(argv[i], "off"))
 214                                 config_video_filter = 0;
 215                         else
 216                                 goto illegal_parameter;
 217                 } else
 218                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 219                         i++;
 220                         if (argc == i)
 221                                 goto missing_parameter;
 222                         if (!strcmp(argv[i], "on"))
 223                                 config_audio_filter = 1;
 224                         else
 225                         if (!strcmp(argv[i], "off"))
 226                                 config_audio_filter = 0;
 227                         else
 228                                 goto illegal_parameter;
 229                 } else
 230                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 231                         i++;
 232                         if (argc == i)
 233                                 goto missing_parameter;
 234                         if (!strcmp(argv[i], "original"))
 235                                 config_render = 0;
 236                         else
 237                         if (!strcmp(argv[i], "opengl"))
 238                                 config_render = 1;
 239                         else
 240                                 goto illegal_parameter;
 241                 } else
 242                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 243                         i++;
 244                         if (argc == i)
 245                                 goto missing_parameter;
 246                         if (!strcmp(argv[i], "normal"))
 247                                 config_benson_size = 1.0;
 248                         else
 249                         if (!strcmp(argv[i], "half")) {
 250                                 config_benson_size = 0.5;
 251                                 if (config_fov == FOV_NOVAGEN)
 252                                         config_fov = FOV_JOLLY;
 253                         } else
 254                                 goto illegal_parameter;
 255                 } else
 256                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 257                         i++;
 258                         if (argc == i)
 259                                 goto missing_parameter;
 260                         config_multisampling = atoi(argv[i]);
 261                 } else
 262                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 263                         i++;
 264                         if (argc == i)
 265                                 goto missing_parameter;
 266                         config_fov = atof(argv[i]);
 267                         if (config_fov < 1.0 || config_fov > 179.0)
 268                                 goto illegal_parameter;
 269                 } else
 270                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 271                         config_skip_intro = 1;
 272                 } else
 273                 if (!strcmp(argv[i], "--fix-sky-rotation")) {
 274                         config_fix_sky_rotation = 1;
 275                 } else
 276                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 277                         config_debug_opengl = 1;
 278                 } else
 279                 if (!strcmp(argv[i], "--debug-transparent")) {
 280                         config_debug_transparent = 1;
 281                 } else
 282                 if (!strcmp(argv[i], "--ctrl-c")) {
 283                         config_ctrl_c = 1;
 284                 } else {
 285                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 286                         return -1;
 287                 }
 288                 i++;
 289         }
 290
 291         return 0;
 292 }
 293
 294 static void osd_info(const char *param, const char *value)
 295 {
 296         char line[41] = "                                        ";
 297
 298         if (param[0]) {
 299                 strncpy(line + 21 - strlen(param), param, strlen(param));
 300                 line[22] = ':';
 301         }
 302         if (strlen(value) > 15) {
 303                 print_error("string too long\n");
 304                 return;
 305         }
 306         strncpy(line + 25, value, strlen(value));
 307         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 308         osd_timer = ticks_sdl() + 2500;
 309 }
 310
 311 static void resize_window(int width, int height)
 312 {
 313         window_width = width;
 314         window_height = height;
 315 }
 316
 317 #ifdef HAVE_OVR
 318 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_trigger_last = 0, button_left_thumb_last = 0, button_right_thumb_last = 0;
 319 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;
 320 static int thrust_last = KEYCODE_SPACE;
 321 static int keyboard_on = 0;
 322 static enum keycode vr_key_pressed = 0, vr_key = 0;
 323
 324 static void handle_vr_poses(void)
 325 {
 326         int button_a = 0, button_b = 0, button_x = 0, button_y = 0, button_menu = 0, button_trigger = 0, button_left_thumb = 0, button_right_thumb = 0;
 327         double hand_right_x = 0.0, hand_right_y = 0.0, hand_right_z = 0.0;
 328         double hand_right_yaw = 0.0, hand_right_pitch = 0.0, hand_right_roll = 0.0;
 329         double head_yaw = 0.0, head_pitch = 0.0, head_roll = 0.0;
 330         double stick_left_x = 0.0, stick_left_y = 0.0, stick_right_x = 0.0, stick_right_y = 0.0;
 331         int thrust = KEYCODE_SPACE;
 332
 333         get_poses_ovr(&button_a, &button_b, &button_x, &button_y, &button_menu, &button_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);
 334         if (button_menu && !button_menu_last) {
 335                 /* menu toggle */
 336                 if (help_view == help_views)
 337                         help_view = 0;
 338                 else
 339                         help_view++;
 340         }
 341         if (help_view) {
 342                 if (button_trigger && !button_trigger_last) {
 343                         /* rigger pressed */
 344                         normalize_observer_ovr();
 345                         osd_info("", "change height");
 346                 }
 347         } else {
 348                 /* handle input */
 349                 if (button_a && !button_a_last) {
 350                         /* keyboard A toggle */
 351                         if (keyboard_on == 1)
 352                                 keyboard_on = 0;
 353                         else
 354                                 keyboard_on = 1;
 355                 }
 356                 if (button_b && !button_b_last) {
 357                         /* keyboard B toggle */
 358                         if (keyboard_on == 2)
 359                                 keyboard_on = 0;
 360                         else
 361                                 keyboard_on = 2;
 362                 }
 363                 if (button_x && !button_x_last) {
 364                         /* 'board' pressed */
 365                         set_amiga_key(KEYCODE_b, 1);
 366                         set_amiga_key(KEYCODE_b, 0);
 367                 }
 368                 if (button_y && !button_y_last) {
 369                         /* 'leave' pressed */
 370                         set_amiga_key(KEYCODE_l, 1);
 371                         set_amiga_key(KEYCODE_l, 0);
 372                 }
 373                 if (button_left_thumb && !button_left_thumb_last) {
 374                         /* 'escape' pressed */
 375                         set_amiga_key(KEYCODE_ESCAPE, 1);
 376                         set_amiga_key(KEYCODE_ESCAPE, 0);
 377                 }
 378                 if (!button_left_thumb && button_left_thumb_last) {
 379                         /* 'escape' released */
 380                         set_amiga_key(KEYCODE_SPACE, 1);
 381                         set_amiga_key(KEYCODE_SPACE, 0);
 382                 }
 383                 if (button_trigger && !button_trigger_last) {
 384                         /* trigger pressed */
 385                         if (!keyboard_on) {
 386                                 set_joystick(-1, -1, -1, -1, 1);
 387                         } else if (vr_key) {
 388                                 vr_key_pressed = vr_key;
 389                                 set_amiga_key(vr_key_pressed, 1);
 390                         }
 391                 }
 392                 if (!button_trigger && button_trigger_last) {
 393                         /* trigger released */
 394                         set_joystick(-1, -1, -1, -1, 0);
 395                         if (vr_key_pressed) {
 396                                 set_amiga_key(vr_key_pressed, 0);
 397                                 vr_key_pressed = 0;
 398                         }
 399                 }
 400                 /* joystick */
 401                 if (stick_right_x > STICK_ROTATE_THRESHOLD)
 402                         set_joystick(0, 1, -1, -1, -1);
 403                 else
 404                 if (stick_right_x < -STICK_ROTATE_THRESHOLD)
 405                         set_joystick(1, 0, -1, -1, -1);
 406                 else
 407                 if (stick_right_x_last > STICK_ROTATE_THRESHOLD || stick_right_x_last < -STICK_ROTATE_THRESHOLD)
 408                         set_joystick(0, 0, -1, -1, -1);
 409                 if (stick_right_y > STICK_WALK_THRESHOLD)
 410                         set_joystick(-1, -1, 1, 0, -1);
 411                 else
 412                 if (stick_right_y < -STICK_WALK_THRESHOLD)
 413                         set_joystick(-1, -1, 0, 1, -1);
 414                 else
 415                 if (stick_right_y_last > STICK_WALK_THRESHOLD || stick_right_y_last < -STICK_WALK_THRESHOLD)
 416                         set_joystick(-1, -1, 0, 0, -1);
 417                 /* thrust */
 418                 if (stick_left_y > STICK_THRUST_THRESHOLD)
 419                         thrust = (stick_left_y - STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD) * 10.5;
 420                 else
 421                 if (stick_left_y < -STICK_THRUST_THRESHOLD)
 422                         thrust = (stick_left_y - -STICK_THRUST_THRESHOLD) / (1.0 - -STICK_THRUST_THRESHOLD) * 10.5;
 423                 else
 424                         thrust = 0;
 425                 if (thrust >= 10)
 426                         thrust = KEYCODE_0;
 427                 else
 428                 if (thrust > 0)
 429                         thrust = KEYCODE_1 + thrust - 1;
 430                 else
 431                 if (thrust < 0)
 432                         thrust = KEYCODE_F1 - thrust - 1;
 433                 else
 434                 if (thrust <= -10)
 435                         thrust = KEYCODE_F10;
 436                 else
 437                         thrust = KEYCODE_SPACE;
 438                 if (thrust_last != thrust) {
 439                         set_amiga_key(thrust, 1);
 440                         set_amiga_key(thrust, 0);
 441                 }
 442         }
 443         button_a_last = button_a;
 444         button_b_last = button_b;
 445         button_x_last = button_x;
 446         button_y_last = button_y;
 447         button_menu_last = button_menu;
 448         button_trigger_last = button_trigger;
 449         button_left_thumb_last = button_left_thumb;
 450         button_right_thumb_last = button_right_thumb;
 451         stick_left_x_last = stick_left_x;
 452         stick_left_y_last = stick_left_y;
 453         stick_right_x_last = stick_right_x;
 454         stick_right_y_last = stick_right_y;
 455         thrust_last = thrust;
 456
 457         /* we must handle keyboard after toggeling keyboard_on,
 458          * so that keyboard_on will not change until keyboard is rendered */
 459         vr_key = 0;
 460         if (keyboard_on)
 461                 handle_vr_keyboard(keyboard_on - 1, hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 462
 463         if (stick_right_y > STICK_WALK_THRESHOLD || stick_right_y < -STICK_WALK_THRESHOLD) {
 464                 double roll, pitch, yaw;
 465                 double dist, east, north;
 466                 int32_t move_east[4], move_north[4];
 467
 468                 mercenary_get_orientation(&roll, &pitch, &yaw);
 469                 /* we use a maximum move of 40 for all 4 steps (this is 10 for each step - equal to 'running') */
 470                 if (stick_right_y > 0.0)
 471                         dist = (stick_right_y - STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 472                 else
 473                         dist = (stick_right_y + STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 474                 east = sin(hand_right_yaw + yaw + M_PI) * dist;
 475                 north = -cos(hand_right_yaw + yaw + M_PI) * dist;
 476                 /* calculatate the integer positions of 4 steps */
 477                 move_east[0] = (int32_t)((east * 0.25) + 0.5);
 478                 move_north[0] = (int32_t)((north * 0.25) + 0.5);
 479                 move_east[1] = (int32_t)((east * 0.5) + 0.5);
 480                 move_north[1] = (int32_t)((north * 0.5) + 0.5);
 481                 move_east[2] = (int32_t)((east * 0.75) + 0.5);
 482                 move_north[2] = (int32_t)((north * 0.75) + 0.5);
 483                 move_east[3] = (int32_t)(east + 0.5);
 484                 move_north[3] = (int32_t)(north + 0.5);
 485                 /* calculate the delta between each of the 4 step */
 486                 move_east[3] -= move_east[2];
 487                 move_north[3] -= move_north[2];
 488                 move_east[2] -= move_east[1];
 489                 move_north[2] -= move_north[1];
 490                 move_east[1] -= move_east[0];
 491                 move_north[1] -= move_north[0];
 492                 /* the game takes 4 steps to move the player */
 493                 mercenary_vr_move(1, move_east, move_north,
 494                         256,
 495                         (int)(256.0 * fabs(stick_right_y) - STICK_WALK_THRESHOLD / (1.0 - STICK_WALK_THRESHOLD) + 0.5));
 496         } else {
 497                 /* don't change what the game actually does when moving joystick in y-direction */
 498                 mercenary_vr_move(0, NULL, NULL, 256, 256);
 499         }
 500 }
 501 #endif
 502
 503 static void skip_intro(void)
 504 {
 505         int event;
 506         double render_delay = 0.0;
 507         double cycle_count;
 508
 509         if (intro_skipped)
 510                 return;
 511
 512         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 513         do {
 514                 /* render, if not delayed */
 515                 if (render_delay <= 0.0) {
 516                         cycle_count = 0;
 517                         do {
 518                                 cycle_count += execute_cpu(0, &event);
 519                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 520                         render_delay += (double)cycle_count / CPU_SPEED;
 521                 }
 522                 /* VBL */
 523                 execute_cpu(3, NULL);
 524                 /* count down render delay */
 525                 if (render_delay) {
 526                         render_delay -= 1.0 / (double)IRQ_RATE;
 527                         if (render_delay < 0.0)
 528                                 render_delay = 0.0;
 529                 }
 530         } while (event != STOP_AT_CLEAR_SCREEN1);
 531
 532         intro_skipped = 1;
 533 }
 534
 535 static void special_event(int event)
 536 {
 537 #ifdef HAVE_OVR
 538         /* handle VR events */
 539         if (event == STOP_AT_PATCH_VR) {
 540                 mercenary_patch_vr();
 541                 return;
 542         }
 543 #endif
 544         /* handle events to improve rendering */
 545         if (render_improved)
 546                 render_capture_event(event);
 547 }
 548
 549 static void main_loop(void)
 550 {
 551         double frame_step, frame_time = 0.0, frame_render = 1;
 552         int had_first_irq = 0;
 553         static uint32_t current_time, last_time = 0, diff;
 554         int i, rc;
 555         int space, length;
 556         int cycle_count, event = STOP_AT_END;
 557         double render_delay = 0.0;
 558         uint32_t palette_address;
 559         uint16_t palette[16];
 560 #ifdef HAVE_OVR
 561         int eye;
 562 #endif
 563
 564         last_time = ticks_sdl();
 565
 566         /* render result on window */
 567         while (!quit) {
 568 #ifdef HAVE_OVR
 569                 /* get vr poses */
 570                 handle_vr_poses();
 571 #endif
 572                 /* if we are in interstellar fligt, we use 50 Hz */
 573                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 574                 /* else we use whatever frame rate the user wants */
 575                 if (render_capture_is_interstellar())
 576                         frame_step = vbl_duration * 50.0;
 577                 else if (!intro_skipped)
 578                         frame_step = vbl_duration * 10.0;
 579                 else
 580                         frame_step = vbl_duration * config_fps;
 581                 if (frame_step > 1.0)
 582                         frame_step = 1.0;
 583                 /* handle SDL events */
 584                 rc = event_sdl();
 585                 if (rc)
 586                         break;
 587
 588                 /* initialize rendering */
 589                 debug_opengl = config_debug_opengl;
 590                 benson_size = config_benson_size;
 591                 render_legacy = (!config_render) || debug_opengl;
 592                 render_improved = config_render || debug_opengl;
 593                 if (!render_improved) {
 594                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 595                         render_capture_reset();
 596                 }
 597                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 598                 /* amgia speed: don't render if we still delay */
 599                 /* non amiga speed: render if we need a new frame */
 600                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 601                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 602                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 603                 if (((frame_render && !config_amiga_speed)
 604                   || (config_amiga_speed && render_delay <= 0.0)
 605                   || event == STOP_AT_WAIT_INPUT)
 606                 && !(had_first_irq && help_view)) {
 607                         frame_render = 0;
 608                         /* start capturing for improved graphics */
 609                         if (render_improved)
 610                                 render_capture_start(config_fov, config_improve_extend_roads, config_improve_smooth_planets, config_fix_sky_rotation, config_debug_transparent);
 611
 612                         /* execute until the rendered image is ready (wait for VBL) */
 613                         cycle_count = 0;
 614                         do {
 615                                 cycle_count += execute_cpu(0, &event);
 616                                 /* handle special events */
 617                                 special_event(event);
 618                                 if (event == STOP_AT_CLEAR_SCREEN1)
 619                                         intro_skipped = 1;
 620                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 621                         /* stop capturing for improved graphics */
 622                         if (render_improved)
 623                                 render_capture_stop();
 624                         /* copy palette */
 625                         palette_address = mercenary_palette_view();
 626                         for (i = 0; i < 16; i++)
 627                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 628                         /* for amiga speed: set delay by the number of cycles */
 629                         if (config_amiga_speed)
 630                                 render_delay += (double)cycle_count / CPU_SPEED;
 631                 }
 632
 633                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 634 #ifdef HAVE_OVR
 635                 begin_render_ovr();
 636
 637                 for (eye = 0; eye < 2; eye++) {
 638                         double camera_x, camera_y, camera_z;
 639                         /* begin of rendering eye, viewport and frustum is set here */
 640                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 641 #else
 642                 {
 643 #endif
 644                         /* clear screen */
 645 #ifdef HAVE_OVR
 646                         opengl_clear(1);
 647 #else
 648                         opengl_clear(0);
 649 #endif
 650                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 651                         if (render_improved) {
 652 #ifndef HAVE_OVR
 653                                 /* viewport and frustum is set here */
 654                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 655 #endif
 656                                 /* render improved graphics, interpolate, if required,
 657                                  * if no item list is available, for legacy rendering
 658                                  */
 659 #ifdef HAVE_OVR
 660                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 1);
 661 #else
 662                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 0);
 663 #endif
 664                                 if (rc)
 665                                         goto goto_legacy;
 666 #ifdef HAVE_OVR
 667                                 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, 1);
 668 #else
 669                                 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, 0);
 670 #endif
 671                                 if (help_view)
 672                                         opengl_blit_osd(0, help_osd[help_view - 1], config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, benson_size, 1.0, 1.0, 0.0, 0.0);
 673                                 if (osd_timer) {
 674                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, benson_size, 0.5, 0.04, 0.5, -0.95);
 675                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 676                                                 osd_timer = 0;
 677                                 }
 678                         }
 679                         /* setup viewport for legacy image and render image, if enabled */
 680                         /* also render legacy, if render_improved failed due to not (yet) available items */
 681                         if (render_legacy) {
 682                                 goto_legacy:
 683                                 /* render game view without benson
 684                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 685                                  */
 686                                 if (had_first_irq)
 687                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 688 #ifndef HAVE_OVR
 689                                 /* viewport and frustum is set here */
 690                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, 1.0);
 691 #endif
 692                                 opengl_blit_image(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, 0, config_fov, config_monitor_distance, 1.0, 0);
 693                                 if (help_view)
 694                                         opengl_blit_osd(0, help_osd[help_view - 1], config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, 1.0, 1.0, 1.0, 0.0, 0.0);
 695                                 if (osd_timer) {
 696                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, 1.0, 0.5, 0.04, 0.5, -0.95);
 697                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 698                                                 osd_timer = 0;
 699                                 }
 700                         }
 701 #ifdef HAVE_OVR
 702                         /* render keyboard */
 703                         if (keyboard_on)
 704                                 render_vr_keyboard(keyboard_on - 1, camera_x, camera_y);
 705
 706                         /* end of rendering eye */
 707                         end_render_ovr_eye(eye);
 708                 }
 709                 /* at this point we are ready with our image, so we display */
 710                 end_render_ovr();
 711                 render_mirror_ovr(window_width, window_height);
 712 #else
 713                 }
 714 #endif
 715                 swap_sdl();
 716
 717                 /* advance frame time, if we are not in help view  */
 718                 if (!(had_first_irq && help_view)) {
 719                         frame_time += frame_step;
 720                         if (frame_time >= 1.0) {
 721                                 frame_time -= 1.0;
 722                                 frame_render = 1;
 723                         }
 724                 }
 725
 726                 /* measure frame rate */
 727                 framerate_measure();
 728
 729                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 730                 /* only do this, if we are not in help view */
 731                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 732                 if (!(had_first_irq && help_view)) {
 733                         current_time = ticks_sdl();
 734                         diff = current_time - last_time;
 735                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 736                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 737                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 738                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 739                         }
 740                         while (diff > 1000 / IRQ_RATE) {
 741                                 /* trigger and execute IRQ 3 = VBL */
 742                                 execute_cpu(3, NULL);
 743                                 had_first_irq = 1;
 744                                 /* transfer benson without game view
 745                                  * because we only got benson refreshed during VBL IRQ
 746                                  */
 747                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 748                                 /* render sound to sound buffer
 749                                  * buffer pointer read and write is atomic, so no locking required!
 750                                  */
 751                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 752                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 753 #ifdef DEBUG_SOUND_BUFFERING
 754                                         fprintf(stderr, "sound buffer overflow\n");
 755 #endif
 756                                         length = space;
 757                                 } else
 758                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 759 #ifdef DEBUG_SOUND_BUFFERING
 760                                 printf("can write %d, write %d\n", space, length);
 761                                 static int cnt = 0;
 762                                 int s;
 763                                 for (s = 0; s < length; s++) {
 764                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 765                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 766                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 767                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 768                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 769                                          cnt++;
 770                                 }
 771 #else
 772                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 773 #endif
 774                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 775                                 diff -= 1000 / IRQ_RATE;
 776                                 last_time += 1000 / IRQ_RATE;
 777
 778                                 /* count down render delay */
 779                                 if (render_delay) {
 780                                         render_delay -= 1.0 / (double)IRQ_RATE;
 781                                         if (render_delay < 0.0)
 782                                                 render_delay = 0.0;
 783                                 }
 784                         }
 785                 }
 786         }
 787 }
 788
 789 static uint16_t io_read(uint32_t address)
 790 {
 791         uint16_t value = 0xffff;
 792
 793         /* joystick and fire button */
 794         if (address == 0xbfe000 || address == 0xdff00c)
 795                 value &= emulate_joystick_read(address);
 796         /* keyboard */
 797         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 798                 value &= emulate_keyboard_read(address);
 799         /* diskette */
 800         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 801                 value &= emulate_disk_read(address);
 802
 803         return value;
 804 }
 805
 806 static void io_write(uint32_t address, uint16_t value)
 807 {
 808         /* dmacon and sound registers */
 809         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 810                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 811         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 812                 emulate_disk_write(address, value);
 813 }
 814
 815 /* two tracks with 0x1820 words of length */
 816 static uint8_t game_save[2][0x1820 << 1];
 817 static int last_track = 0;
 818
 819 /* game reads track with saved game */
 820 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 821 {
 822         if (length > sizeof(game_save[0])) {
 823                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 824                 return;
 825         }
 826
 827         /* if even track is selected, load game */
 828         if (!(track & 1)) {
 829                 char filename[256];
 830                 int gamesave_num = (track - 2) >> 1;
 831                 int got;
 832                 FILE *fp;
 833
 834                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 835 #if defined(_WIN32)
 836                 filename[0] = '\0';
 837 #else
 838                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 839                 mkdir(filename, 0777);
 840 #endif
 841                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 842                 fp = fopen(filename, "r");
 843                 if (!fp) {
 844 fail:
 845                         print_info("failed to load game from '%s'\n", filename);
 846                         goto copy;
 847                 }
 848                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 849                 fclose(fp);
 850                 if (got != 2)
 851                         goto fail;
 852         }
 853
 854 copy:
 855         /* copy track */
 856         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 857 }
 858
 859 /* game writes track with saved game */
 860 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 861 {
 862         /* skip sync info that is provided by game and only relevant for a real disk track */
 863         data += 0x200;
 864         length -= 0x200;
 865
 866         if (length != sizeof(game_save[0])) {
 867                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 868                 return;
 869         }
 870
 871         /* don't save if last track is the same, because disk is written on both sides with the same data */
 872         if (track == last_track) {
 873                 if (memcmp(memory + data, game_save[track & 1], length)) {
 874                         print_error("saving game data on other side of the disk is different, please fix!\n");
 875                 }
 876                 return;
 877         }
 878         last_track = track;
 879
 880         /* save game data */
 881         memcpy(game_save[track & 1], memory + data, length);
 882
 883         /* if done with saving */
 884         if ((track & 1)) {
 885                 char filename[256];
 886                 int gamesave_num = (track - 2) >> 1;
 887                 int wrote;
 888                 FILE *fp;
 889
 890 #if defined(_WIN32)
 891                 filename[0] = '\0';
 892 #else
 893                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 894                 mkdir(filename, 0777);
 895 #endif
 896                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 897                 fp = fopen(filename, "w");
 898                 if (!fp) {
 899 fail:
 900                         print_error("failed to save game to '%s'\n", filename);
 901                         return;
 902                 }
 903                 print_info("Game state saved to '%s'\n", filename);
 904                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 905                 fclose(fp);
 906                 if (wrote != 2)
 907                         goto fail;
 908         }
 909 }
 910
 911 static int shift = 0, ctrl = 0;
 912
 913 static void keyboard_sdl(int down, enum keycode keycode)
 914 {
 915         switch (keycode) {
 916         case KEYCODE_LCTRL:
 917         case KEYCODE_RCTRL:
 918                 ctrl = down;
 919                 break;
 920         default: break;
 921         }
 922
 923         if (ctrl && down) {
 924                 switch (keycode) {
 925                 case KEYCODE_h:
 926                         if (help_view == help_views)
 927                                 help_view = 0;
 928                         else
 929                                 help_view++;
 930                         break;
 931                 case KEYCODE_v:
 932                         config_video_filter ^= 1;
 933                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 934                         break;
 935                 case KEYCODE_a:
 936                         config_audio_filter ^= 1;
 937                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 938                         break;
 939                 case KEYCODE_s:
 940                         config_amiga_speed ^= 1;
 941                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 942                         break;
 943                 case KEYCODE_r:
 944                         config_render ^= 1;
 945                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 946                         break;
 947                 case KEYCODE_b:
 948                         if (!config_render && !config_debug_opengl) {
 949                                 osd_info("", "not applicable");
 950                                 break;
 951                         }
 952                         if (config_benson_size == 0.5) {
 953                                 config_benson_size = 1.0;
 954                                 config_fov = FOV_NOVAGEN;
 955                         } else {
 956                                 config_benson_size = 0.5;
 957                                 config_fov = FOV_JOLLY;
 958                         }
 959                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 960                         break;
 961                 case KEYCODE_i:
 962                         if (!intro_skipped)
 963                                 skip_intro();
 964                         else
 965                                 osd_info("", "not applicable");
 966                         break;
 967                 case KEYCODE_c:
 968                         if (config_ctrl_c)
 969                                 quit = 1;
 970                         break;
 971                 case KEYCODE_o:
 972 #ifdef HAVE_OVR
 973                         normalize_observer_ovr();
 974                         osd_info("", "change height");
 975 #else
 976                         osd_info("", "not applicable");
 977 #endif
 978                         break;
 979                 case KEYCODE_KP_PLUS:
 980                         if (config_fov / 1.2 >= FOV_MIN)
 981                                 config_fov /= 1.2;
 982                         disp_fov:
 983                         {
 984                                 char text[16];
 985                                 sprintf(text, "%.2f", config_fov);
 986                                 osd_info("FOV", text);
 987                         }
 988                         break;
 989                 case KEYCODE_KP_MINUS:
 990                         if (config_fov * 1.2 <= FOV_MAX)
 991                                 config_fov *= 1.2;
 992                         goto disp_fov;
 993                 default: break;
 994                 }
 995                 /* do not pass keys to game while holding CTRL */
 996                 return;
 997         }
 998
 999         if (keycode == KEYCODE_PAUSE && down) {
1000                 if (help_view == help_views)
1001                         help_view = 0;
1002                 else
1003                         help_view++;
1004         }
1005
1006         /* in help view we must not forward keypresses */
1007         if (help_view)
1008                 return;
1009
1010         switch (keycode) {
1011         case KEYCODE_LSHIFT:
1012                 set_amiga_key(keycode, down);
1013                 shift = down;
1014                 break;
1015         case KEYCODE_RSHIFT:
1016                 set_amiga_key(keycode, down);
1017                 shift = down;
1018                 break;
1019         case KEYCODE_LEFT:
1020                 if (shift && down) {
1021                         set_amiga_key(keycode, down);
1022                         set_joystick(-1, -1, -1, -1, -1);
1023                         break;
1024                 }
1025                 set_amiga_key(keycode, 0);
1026                 set_joystick(down, -1, -1, -1, -1);
1027                 break;
1028         case KEYCODE_RIGHT:
1029                 if (shift && down) {
1030                         set_amiga_key(keycode, down);
1031                         set_joystick(-1, -1, -1, -1, -1);
1032                         break;
1033                 }
1034                 set_amiga_key(keycode, 0);
1035                 set_joystick(-1, down, -1, -1, -1);
1036                 break;
1037         case KEYCODE_UP:
1038                 if (shift && down) {
1039                         set_amiga_key(keycode, down);
1040                         set_joystick(-1, -1, -1, -1, -1);
1041                         break;
1042                 }
1043                 set_amiga_key(keycode, 0);
1044                 set_joystick(-1, -1, down, -1, -1);
1045                 break;
1046         case KEYCODE_DOWN:
1047                 if (shift && down) {
1048                         set_amiga_key(keycode, down);
1049                         set_joystick(-1, -1, -1, -1, -1);
1050                         break;
1051                 }
1052                 set_amiga_key(keycode, 0);
1053                 set_joystick(-1, -1, -1, down, -1);
1054                 break;
1055         case KEYCODE_END:
1056                 set_joystick(-1, -1, -1, -1, down);
1057                 break;
1058         case KEYCODE_INSERT:
1059                 set_amiga_key(KEYCODE_HELP, down);
1060                 break;
1061         default:
1062                 set_amiga_key(keycode, down);
1063         }
1064 }
1065
1066 void audio_sdl(float *data, int length)
1067 {
1068         int fill, s;
1069
1070         /* read sound from sound buffer
1071          * buffer pointer read and write is atomic, so no locking required!
1072          */
1073         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1074         if (fill < length) {
1075 #ifdef DEBUG_SOUND_BUFFERING
1076                 fprintf(stderr, "sound buffer underrun\n");
1077 #endif
1078                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1079                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1080         }
1081         for (s = 0; s < length; s++) {
1082                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1083                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1084         }
1085 #ifdef DEBUG_SOUND_BUFFERING
1086         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1087 #endif
1088         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1089 }
1090
1091 void sound_irq(void)
1092 {
1093         /* trigger and execute IRQ 4 = sound */
1094         execute_cpu(4, NULL);
1095 }
1096
1097 int main(int argc, char *argv[])
1098 {
1099         int rc;
1100         int sdl_sound_chunk;
1101
1102         home_dir = getenv("HOME");
1103         if (!home_dir)
1104                 home_dir = "";
1105
1106         rc = parse_args(argc, argv);
1107         if (rc)
1108                 return 0;
1109
1110         /* allocate image */
1111         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1112         if (!image) {
1113                 print_error("Failed to allocate image buffer\n");
1114                 goto done;
1115         }
1116
1117         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1118                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1119                 goto done;
1120         }
1121         if ((1000 % IRQ_RATE)) {
1122                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1123                 goto done;
1124         }
1125
1126         /* calculate SDL chunk size for audio
1127          * it must be a power of two, but not more than the chunk size for each IRQ!
1128          */
1129         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1130                 ;
1131         sdl_sound_chunk >>= 1;
1132 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1133
1134         /* allocate sound buffers */
1135         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1136         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1137         if (!sound_buffer) {
1138                 print_error("Failed to allocate image buffer\n");
1139                 goto done;
1140         }
1141
1142         /* allocate memory */
1143         memory = calloc(MEMORY_SIZE, 1);
1144         if (!memory) {
1145                 print_error("Failed to allocate cpu's memory\n");
1146                 goto done;
1147         }
1148         stop_event = calloc(MEMORY_SIZE, 1);
1149         if (!stop_event) {
1150                 print_error("Failed to allocate cpu's stop_event memory\n");
1151                 goto done;
1152         }
1153         chipreg = calloc(IOSIZE, 1);
1154         if (!chipreg) {
1155                 print_error("Failed to allocate chip register\n");
1156                 goto done;
1157         }
1158
1159         /* init cpu code */
1160         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1161
1162         /* init disk emulation */
1163         disk_init(disk_read, disk_write);
1164
1165         /* load binary */
1166         mercenary_load();
1167
1168         /* patch some stuff */
1169         mercenary_patch();
1170
1171         /* init SDL and OpenGL */
1172 #ifdef HAVE_OVR
1173         int vbl_sync = 0;
1174         int rift = 1;
1175         int multisampling = 0;
1176         window_width = SCREEN_WIDTH;
1177         window_height = SCREEN_HEIGHT;
1178 #else
1179         int vbl_sync = 1;
1180         int rift = 0;
1181         int multisampling = config_multisampling;
1182         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1183         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1184 #endif
1185         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, multisampling, vbl_sync, rift);
1186         if (rc < 0)
1187                 goto done;
1188 #ifdef HAVE_OVR
1189         rc = init_ovr(config_multisampling);
1190         if (rc < 0)
1191                 goto done;
1192         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1193         if (rc < 0)
1194                 goto done;
1195 #endif
1196         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1197         if (rc < 0)
1198                 goto done;
1199
1200         /* init osd */
1201         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1202         if (rc < 0)
1203                 goto done;
1204         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1205         if (rc < 0)
1206                 goto done;
1207         help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1208         if (!help_osd[0])
1209                 goto done;
1210         text_render(help_osd[0], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
1211         text_render(help_osd[0], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1212                 "Emulation:\n"
1213                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1214                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1215                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1216                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1217                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1218                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1219                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1220                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1221                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1222 #ifdef HAVE_OVR
1223                 "        Press `CTRL' + `O' (or right trigger) to reset observer position.\n"
1224 #endif
1225                 "\n"
1226                 "Answer to a Question:\n"
1227                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1228                 "\n"
1229                 "Walking / Driving / Flying:\n"
1230                 "        Use cursor keys as joystick, to move player / craft.\n"
1231                 "        Press `R' for running, 'W' for walking speed.\n"
1232                 "        Press `B' to board, `L' to leave.\n"
1233                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1234                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1235                 "        Press `SPACE' to stop craft.\n"
1236                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1237                 "        Press `T' for turbo on certain craft.\n"
1238                 "        Press `END' as joystick's fire button.\n"
1239                 "\n"
1240                 "Elevator:\n"
1241                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1242                 "\n"
1243                 "Inside a transporter:\n"
1244                 "        Press `1'...`0' to select destination.\n"
1245                 "\n"
1246                 "Items:\n"
1247                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1248                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1249                 "        Press `NUMPAD Enter' to select certain items.\n"
1250                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1251                 "        Press `NUMPAD *' to read entry\n"
1252                 "Saving / Loading / Pause:\n"
1253                 "        Press `INSERT' to loading and saving options.\n"
1254                 "        Press `ENTER' to pause game, other key to continue.\n"
1255                 ,HELP_ALPHA, 1, 2, 5, 0);
1256 #ifdef HAVE_OVR
1257         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1258         if (!help_osd[1])
1259                 goto done;
1260         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);
1261         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1262                 "Emulation using Controller:\n"
1263                 "        Press `Enter' button to toggle this help screen on or off.\n"
1264                 "        Press `A' button to emulate keyboard to control game.\n"
1265                 "        Press `B' button to emulate keyboard to enter alphanumeric keys.\n"
1266                 "        Press `A' or `B' button again to dismiss keyboard.\n"
1267                 "        Point right controller to a key on keyboard. The key will highlight.\n"
1268                 "        Press `Trigger' on right controller enter the highlighted key.\n"
1269                 "\n"
1270                 "Walking / Driving / Flying using Controller:\n"
1271                 "        Use thumb stick on right controller, to move player / craft.\n"
1272                 "        Press `X' button to board, `Y' button to leave.\n"
1273                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1274                 "        Press and hold thumb stick on left controller for escape sequence.\n"
1275                 "        Release thumb stick on left controller stop craft.\n"
1276                 "        Press `Trigger' on right controller to fire.\n"
1277                 "\n"
1278                 "For all other game function, use the emulated keyboards!\n"
1279                 ,HELP_ALPHA, 1, 2, 5, 0);
1280         help_views = 2;
1281 #endif
1282         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1283         if (!info_osd)
1284                 goto done;
1285
1286         /* init audio */
1287         sound_init(SOUND_SAMPLERATE, sound_irq);
1288
1289         /* start cpu */
1290         reset_cpu();
1291
1292         if (config_skip_intro)
1293                 skip_intro();
1294
1295         /* run game */
1296         main_loop();
1297
1298 done:
1299         exit_opengl();
1300 #ifdef HAVE_OVR
1301         exit_ovr();
1302 #endif
1303         exit_sdl();
1304
1305         if (chipreg)
1306                 free(chipreg);
1307         if (stop_event)
1308                 free(stop_event);
1309         if (memory)
1310                 free(memory);
1311         if (sound_buffer)
1312                 free(sound_buffer);
1313         if (image)
1314                 free(image);
1315         if (help_osd[0])
1316                 free(help_osd[0]);
1317         if (help_osd[1])
1318                 free(help_osd[1]);
1319         if (info_osd)
1320                 free(info_osd);
1321
1322         return 0;
1323 }
1324