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 0.1 /* move the stick until the craft moves */
  55
  56 static int config_ctrl_c = 0;
  57 static int config_amiga_speed = 0; /* fast speed */
  58 static double config_fps = 16.0;
  59 #if !defined(_WIN32)
  60 static const char *config_gamesave_dir = ".mercenary";
  61 #endif
  62 static int config_video_filter = 1;
  63 static int config_audio_filter = 1;
  64 static int config_render = 1; /* opengl render */
  65 static int config_skip_intro = 0;
  66 static int config_multisampling = 8;
  67 #ifdef HAVE_OVR
  68 static double config_benson_size = 0.5;
  69 static double config_fov = FOV_JOLLY;
  70 #else
  71 static double config_benson_size = 1.0;
  72 static double config_fov = FOV_NOVAGEN;
  73 #endif
  74 static double config_monitor_distance = 31.5; /* inch */
  75 #ifdef HAVE_OVR
  76 static double config_keyboard_distance = 28.5; /* inch */
  77 static double config_keyboard_height = 4.0; /* 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
  87 #define CPU_SPEED       7093790.0;
  88
  89 #define SOUND_SAMPLERATE 48000
  90 /* - game IRQ rate
  91  * - must be used for sound rendering chunk
  92  */
  93 #define IRQ_RATE        50
  94 /* numbe of buffer chunks to dejitter:
  95  * - SDL render interval
  96  * - sound rendering interval
  97  * - sound card interval
  98  * 4 should be minimum, if video rate is >=50 Hz
  99  */
 100 #define SOUND_CHUNKS    4
 101
 102 /* test sound to check if buffer does not overflow / underrun */
 103 //#define DEBUG_SOUND_BUFFERING
 104
 105 #define IOSIZE          0x1000 /* bytes in io space */
 106 #define MEMORY_SIZE     0x80000
 107 static uint8_t *memory = NULL;
 108 static uint8_t *stop_event = NULL;
 109 static uint8_t *image = NULL;
 110 static uint8_t *help_osd[2] = { NULL, NULL };
 111 static uint8_t *info_osd = NULL;
 112 static int help_view = 1;
 113 static int help_views = 1;
 114 static int32_t osd_timer = 0;
 115 #ifdef HAVE_OVR
 116 #define SCREEN_WIDTH    1344
 117 #define SCREEN_HEIGHT   800
 118 #else
 119 #define SCREEN_WIDTH    (320*3)
 120 #define SCREEN_HEIGHT   (200*3)
 121 #endif
 122 #define IMAGE_WIDTH     320
 123 #define IMAGE_HEIGHT    200
 124 #define BENSON_AT_LINE  136
 125 #define IMAGE_DIWSTART  0x2c
 126 #define HELP_ALPHA      0xd0
 127 #define OSD_WIDTH       320
 128 #define OSD_HEIGHT      16
 129 static uint16_t *chipreg = NULL;
 130 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 131 static int sound_buffer_size; /* buffer sample size */
 132 static int sound_buffer_writep; /* write pointer at buffer */
 133 static int sound_buffer_readp; /* read pointer at buffer */
 134 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 135 static double benson_size; /* render size of benson */
 136 static int render_legacy = 0; /* render original amiga screen, if set */
 137 static int render_improved = 0; /* render improved image, if set */
 138 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 139 static int intro_skipped = 0; /* indicated if we already have landed */
 140 static int window_width, window_height;
 141
 142 static const char *home_dir;
 143
 144 static int quit = 0;
 145
 146 int parse_args(int argc, char *argv[])
 147 {
 148         int i = 1;
 149
 150         while (argc > i) {
 151                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 152                         /*          |                                                                             | */
 153                         print_info("Usage: %s\n", argv[0]);
 154                         print_info(" -s --render-speed original | fast\n");
 155                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 156                         print_info("    --fps <fps>\n");
 157                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 158                         print_info(" -v --video-filter on | off\n");
 159                         print_info("        Set video filter.\n");
 160                         print_info(" -a --audio-filter on | off\n");
 161                         print_info("        Set audio filter.\n");
 162                         print_info(" -r --render original | opengl\n");
 163                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 164                         print_info(" -b --benson normal | half\n");
 165                         print_info("        Size of 'Benson' (control panel).\n");
 166                         print_info(" -m --multisampling <samples>\n");
 167                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 168                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 169                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 170                         print_info(" -i --skip-intro\n");
 171                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 172                         print_info("Improvement options:\n");
 173                         print_info("    --extend-roads 1 | 0\n");
 174                         print_info("        Roads in the distance end in a single point. This was ok for low\n");
 175                         print_info("        resolution, but for OpenGL we want equal width all the way.\n");
 176                         print_info("        This requires OpenGL rendering. (default = %d)\n", config_improve_extend_roads);
 177                         print_info("    --smooth-planets 1 | 0\n");
 178                         print_info("        Planet's rotation uses integer value, so they judder in the original\n");
 179                         print_info("        game rendering. This option requires OpenGL rendering. (default = %d)\n", config_improve_smooth_planets);
 180                         print_info("    --stars-rotation 1 | 0\n");
 181                         print_info("        Stars are rendered originally by using a fast routine. Use this option\n");
 182                         print_info("        to make them render on a sphere. They also rotate with the sky then.\n");
 183                         print_info("        This requires OpenGL rendering and is default with VR. (default = %d)\n", config_improve_stars_rotation);
 184                         print_info("    --fix-sky-rotation 1 | 0\n");
 185                         print_info("        Sky rotates in the wrong direction, if flying over planet. This is\n");
 186                         print_info("        fixed by rotating all sky object by 180 degrees. The original (wrong)\n");
 187                         print_info("        rotation is default, because it preserves the game's spirit!\n");
 188                         print_info("        This option requires OpenGL rendering. (default = %d)\n", config_improve_fix_sky_rotation);
 189                         print_info("Debug options:\n");
 190                         print_info(" -o --debug-opengl\n");
 191                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 192                         print_info("    --debug-transparent\n");
 193                         print_info("        Draw all things half transparent.\n");
 194                         print_info("    --ctrl-c\n");
 195                         print_info("        Use CTRL+C to exit game (used for development)\n");
 196                         return -1;
 197                 } else
 198                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 199                         i++;
 200                         if (argc == i) {
 201 missing_parameter:
 202                                 print_info("Missing parameter, use '--help'!\n");
 203                                 return -1;
 204                         }
 205                         if (!strcmp(argv[i], "original"))
 206                                 config_amiga_speed = 1;
 207                         else
 208                         if (!strcmp(argv[i], "fast"))
 209                                 config_amiga_speed = 0;
 210                         else {
 211 illegal_parameter:
 212                                 print_info("Illegal parameter, use '--help'!\n");
 213                                 return -1;
 214                         }
 215                 } else
 216                 if (!strcmp(argv[i], "--fps")) {
 217                         i++;
 218                         if (argc == i)
 219                                 goto missing_parameter;
 220                         config_fps = atof(argv[i]);
 221                         if (config_fov <= 0.0)
 222                                 goto illegal_parameter;
 223                 } else
 224                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 225                         i++;
 226                         if (argc == i)
 227                                 goto missing_parameter;
 228                         if (!strcmp(argv[i], "on"))
 229                                 config_video_filter = 1;
 230                         else
 231                         if (!strcmp(argv[i], "off"))
 232                                 config_video_filter = 0;
 233                         else
 234                                 goto illegal_parameter;
 235                 } else
 236                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 237                         i++;
 238                         if (argc == i)
 239                                 goto missing_parameter;
 240                         if (!strcmp(argv[i], "on"))
 241                                 config_audio_filter = 1;
 242                         else
 243                         if (!strcmp(argv[i], "off"))
 244                                 config_audio_filter = 0;
 245                         else
 246                                 goto illegal_parameter;
 247                 } else
 248                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 249                         i++;
 250                         if (argc == i)
 251                                 goto missing_parameter;
 252                         if (!strcmp(argv[i], "original"))
 253                                 config_render = 0;
 254                         else
 255                         if (!strcmp(argv[i], "opengl"))
 256                                 config_render = 1;
 257                         else
 258                                 goto illegal_parameter;
 259                 } else
 260                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 261                         i++;
 262                         if (argc == i)
 263                                 goto missing_parameter;
 264                         if (!strcmp(argv[i], "normal"))
 265                                 config_benson_size = 1.0;
 266                         else
 267                         if (!strcmp(argv[i], "half")) {
 268                                 config_benson_size = 0.5;
 269                                 if (config_fov == FOV_NOVAGEN)
 270                                         config_fov = FOV_JOLLY;
 271                         } else
 272                                 goto illegal_parameter;
 273                 } else
 274                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 275                         i++;
 276                         if (argc == i)
 277                                 goto missing_parameter;
 278                         config_multisampling = atoi(argv[i]);
 279                 } else
 280                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 281                         i++;
 282                         if (argc == i)
 283                                 goto missing_parameter;
 284                         config_fov = atof(argv[i]);
 285                         if (config_fov < 1.0 || config_fov > 179.0)
 286                                 goto illegal_parameter;
 287                 } else
 288                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 289                         config_skip_intro = 1;
 290                 } else
 291                 if (!strcmp(argv[i], "--extend-roads")) {
 292                         i++;
 293                         if (argc == i)
 294                                 goto missing_parameter;
 295                         config_improve_extend_roads = atoi(argv[i]);
 296                 } else
 297                 if (!strcmp(argv[i], "--smooth-planets")) {
 298                         i++;
 299                         if (argc == i)
 300                                 goto missing_parameter;
 301                         config_improve_smooth_planets = atoi(argv[i]);
 302                 } else
 303                 if (!strcmp(argv[i], "--stars-rotation")) {
 304                         i++;
 305                         if (argc == i)
 306                                 goto missing_parameter;
 307                         config_improve_stars_rotation = atoi(argv[i]);
 308                 } else
 309                 if (!strcmp(argv[i], "--fix-sky-rotation")) {
 310                         i++;
 311                         if (argc == i)
 312                                 goto missing_parameter;
 313                         config_improve_fix_sky_rotation = atoi(argv[i]);
 314                 } else
 315                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 316                         config_debug_opengl = 1;
 317                 } else
 318                 if (!strcmp(argv[i], "--debug-transparent")) {
 319                         config_debug_transparent = 1;
 320                 } else
 321                 if (!strcmp(argv[i], "--ctrl-c")) {
 322                         config_ctrl_c = 1;
 323                 } else {
 324                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 325                         return -1;
 326                 }
 327                 i++;
 328         }
 329
 330         return 0;
 331 }
 332
 333 static void osd_info(const char *param, const char *value)
 334 {
 335         char line[41] = "                                        ";
 336
 337         if (param[0]) {
 338                 strncpy(line + 21 - strlen(param), param, strlen(param));
 339                 line[22] = ':';
 340         }
 341         if (strlen(value) > 15) {
 342                 print_error("string too long\n");
 343                 return;
 344         }
 345         strncpy(line + 25, value, strlen(value));
 346         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 347         osd_timer = ticks_sdl() + 2500;
 348 }
 349
 350 static void resize_window(int width, int height)
 351 {
 352         window_width = width;
 353         window_height = height;
 354 }
 355
 356 #ifdef HAVE_OVR
 357 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;
 358 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;
 359 static int thrust_last = 0;
 360 static int joystick_set_x_last = 0, joystick_set_y_last = 0;
 361 static int keyboard_on = 0;
 362 static enum keycode vr_key_pressed = 0, vr_key = 0;
 363
 364 static void handle_vr_poses(void)
 365 {
 366         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;
 367         double hand_right_x = 0.0, hand_right_y = 0.0, hand_right_z = 0.0;
 368         double hand_right_yaw = 0.0, hand_right_pitch = 0.0, hand_right_roll = 0.0;
 369         double head_yaw = 0.0, head_pitch = 0.0, head_roll = 0.0;
 370         double stick_left_x = 0.0, stick_left_y = 0.0, stick_right_x = 0.0, stick_right_y = 0.0;
 371         int thrust = 0;
 372         int joystick_set_x = 0, joystick_set_y = 0;
 373         static uint32_t current_time, last_time = 0, diff;
 374         static double increment, inc_count = 0.0;
 375
 376         /* handle input */
 377         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);
 378         if (button_menu && !button_menu_last) {
 379                 /* menu toggle */
 380                 if (help_view == help_views)
 381                         help_view = 0;
 382                 else
 383                         help_view++;
 384         }
 385         if (button_left_trigger && button_right_trigger) {
 386                 /* reset observer */
 387                 reset_observer_ovr();
 388                 osd_info("", "reset observer");
 389         }
 390         if (!help_view) {
 391                 if (button_a && !button_a_last) {
 392                         /* keyboard A toggle */
 393                         if (keyboard_on == 1)
 394                                 keyboard_on = 0;
 395                         else
 396                                 keyboard_on = 1;
 397                 }
 398                 if (button_b && !button_b_last) {
 399                         /* keyboard B toggle */
 400                         if (keyboard_on == 2)
 401                                 keyboard_on = 0;
 402                         else
 403                                 keyboard_on = 2;
 404                 }
 405                 if (button_x && !button_x_last) {
 406                         /* 'board' pressed */
 407                         set_amiga_key(KEYCODE_b, 1);
 408                         set_amiga_key(KEYCODE_b, 0);
 409                 }
 410                 if (button_y && !button_y_last) {
 411                         /* 'leave' pressed */
 412                         set_amiga_key(KEYCODE_l, 1);
 413                         set_amiga_key(KEYCODE_l, 0);
 414                 }
 415                 if (button_right_thumb && !button_right_thumb_last) {
 416                         /* 'change orientation' pressed */
 417                         double roll, pitch, yaw;
 418                         mercenary_get_orientation(&roll, &pitch, &yaw);
 419                         mercenary_set_orientation(yaw + hand_right_yaw);
 420                 }
 421                 if (button_right_trigger && !button_right_trigger_last) {
 422                         /* trigger pressed */
 423                         if (!keyboard_on) {
 424                                 set_joystick(-1, -1, -1, -1, 1);
 425                         } else if (vr_key) {
 426                                 vr_key_pressed = vr_key;
 427                                 set_amiga_key(vr_key_pressed, 1);
 428                         }
 429                 }
 430                 if (!button_right_trigger && button_right_trigger_last) {
 431                         /* trigger released */
 432                         set_joystick(-1, -1, -1, -1, 0);
 433                         if (vr_key_pressed) {
 434                                 set_amiga_key(vr_key_pressed, 0);
 435                                 vr_key_pressed = 0;
 436                         }
 437                 }
 438                 /* joystick */
 439                 /* reset moving state, so the game is not influenced before we want to */
 440                 mercenary_vr_move(0, NULL, NULL, 256, 256);
 441                 joystick_set_x = 0;
 442                 joystick_set_y = 0;
 443                 if (!mercenary_get_info_walking()) {
 444                         /* turn right and left when not walking */
 445                         if (stick_right_x > STICK_ROTATE_THRESHOLD) {
 446                                 set_joystick(0, 1, -1, -1, -1);
 447                                 joystick_set_x = 1;
 448                         } else
 449                         if (stick_right_x < -STICK_ROTATE_THRESHOLD) {
 450                                 set_joystick(1, 0, -1, -1, -1);
 451                                 joystick_set_x = 1;
 452                         }
 453                         /* pitch craft */
 454                         if (stick_right_y > STICK_WALK_THRESHOLD) {
 455                                 set_joystick(-1, -1, 1, 0, -1);
 456                                 joystick_set_y = 1;
 457                         } else
 458                         if (stick_right_y < -STICK_WALK_THRESHOLD) {
 459                                 set_joystick(-1, -1, 0, 1, -1);
 460                                 joystick_set_y = 1;
 461                         }
 462                         if (joystick_set_x || joystick_set_y) {
 463                                 mercenary_vr_move(0, NULL, NULL,
 464                                         256,
 465                                         (int)(256.0 * fabs(stick_right_y) - STICK_WALK_THRESHOLD / (1.0 - STICK_WALK_THRESHOLD) + 0.5));
 466                         }
 467                 } else {
 468                         double roll, pitch, yaw;
 469                         double dist, dir, east, north;
 470                         int32_t move_east[4], move_north[4];
 471
 472                         /* check if we push the stick */
 473                         dist = sqrt(stick_right_x * stick_right_x + stick_right_y * stick_right_y);
 474                         if (dist > STICK_WALK_THRESHOLD) {
 475                                 /* get stick amplitude (dist) and direction (dir) */
 476                                 if (dist > 1.0)
 477                                         dist = 1.0;
 478                                 dist = (dist - STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 479                                 dir = atan2(stick_right_x, stick_right_y);
 480                                 /* use hand direction to get actual stick direction */
 481                                 dir = fmod(dir - hand_right_yaw, M_PI * 2.0);
 482                                 if (dir < -M_PI)
 483                                         dir += M_PI * 2.0;
 484                                 if (dir > M_PI)
 485                                         dir -= M_PI * 2.0;
 486                                 /* flip directin, if we walk backwards */
 487                                 if (dir > M_PI / 2.0 || dir < -M_PI / 2.0) {
 488                                         /* go backwards */
 489                                         set_joystick(-1, -1, 0, 1, -1);
 490                                         joystick_set_y = 1;
 491                                 } else {
 492                                         /* go forward */
 493                                         set_joystick(-1, -1, 1, 0, -1);
 494                                         joystick_set_y = 1;
 495                                 }
 496                                 joystick_set_y = 1;
 497                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 498                                 east = sin(yaw - dir + M_PI) * dist;
 499                                 north = -cos(yaw - dir + M_PI) * dist;
 500                                 /* calculatate the integer positions of 4 steps */
 501                                 move_east[0] = (int32_t)((east * 0.25) + 0.5);
 502                                 move_north[0] = (int32_t)((north * 0.25) + 0.5);
 503                                 move_east[1] = (int32_t)((east * 0.5) + 0.5);
 504                                 move_north[1] = (int32_t)((north * 0.5) + 0.5);
 505                                 move_east[2] = (int32_t)((east * 0.75) + 0.5);
 506                                 move_north[2] = (int32_t)((north * 0.75) + 0.5);
 507                                 move_east[3] = (int32_t)(east + 0.5);
 508                                 move_north[3] = (int32_t)(north + 0.5);
 509                                 /* calculate the delta between each of the 4 step */
 510                                 move_east[3] -= move_east[2];
 511                                 move_north[3] -= move_north[2];
 512                                 move_east[2] -= move_east[1];
 513                                 move_north[2] -= move_north[1];
 514                                 move_east[1] -= move_east[0];
 515                                 move_north[1] -= move_north[0];
 516                                 /* the game takes 4 steps to move the player */
 517                                 mercenary_vr_move(1, move_east, move_north, 256, 256);
 518                         }
 519                 }
 520                 if (joystick_set_x_last && !joystick_set_x)
 521                         set_joystick(0, 0, -1, -1, -1);
 522                 if (joystick_set_y_last && !joystick_set_y)
 523                         set_joystick(-1, -1, 0, 0, -1);
 524                 /* thrust */
 525                 thrust = thrust_last;
 526                 /* button to toggle between stop and escape */
 527                 if (button_left_thumb && !button_left_thumb_last) {
 528                         /* 'escape' pressed */
 529                         if (thrust_last == 0)
 530                                 thrust = -99;
 531                         else
 532                                 thrust = 0;
 533                 }
 534                 /* get stick to increment or decrement thrust */
 535                 if (stick_left_y > STICK_THRUST_THRESHOLD)
 536                         increment = (stick_left_y - STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 537                 else
 538                 if (stick_left_y < -STICK_THRUST_THRESHOLD)
 539                         increment = (stick_left_y + STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 540                 else
 541                         increment = 0;
 542                 current_time = ticks_sdl();
 543                 if (increment) {
 544                         diff = current_time - last_time;
 545                         inc_count += increment * diff;
 546                         if (inc_count > 150.0 && thrust >= -10 && thrust < 10) {
 547                                 thrust++;
 548                                 inc_count = 0.0;
 549                         }
 550                         if (inc_count < -150.0 && thrust <= 10 && thrust > -10) {
 551                                 thrust--;
 552                                 inc_count = 0.0;
 553                         }
 554                 } else {
 555                         inc_count = 0;
 556                 }
 557                 last_time = current_time;
 558                 /* send thrust change as keycodes */
 559                 if (thrust_last != thrust) {
 560                         if (thrust >= 10) {
 561                                 set_amiga_key(KEYCODE_0, 1);
 562                                 set_amiga_key(KEYCODE_0, 0);
 563                         } else
 564                         if (thrust <= -10 && thrust > -99) {
 565                                 set_amiga_key(KEYCODE_F10, 1);
 566                                 set_amiga_key(KEYCODE_F10, 0);
 567                         } else
 568                         if (thrust <= -99) {
 569                                 set_amiga_key(KEYCODE_ESCAPE, 1);
 570                                 set_amiga_key(KEYCODE_ESCAPE, 0);
 571                         } else
 572                         if (thrust > 0) {
 573                                 set_amiga_key(KEYCODE_1 + thrust - 1, 1);
 574                                 set_amiga_key(KEYCODE_1 + thrust - 1, 0);
 575                         } else
 576                         if (thrust < 0) {
 577                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 1);
 578                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 0);
 579                         } else {
 580                                 set_amiga_key(KEYCODE_SPACE, 1);
 581                                 set_amiga_key(KEYCODE_SPACE, 0);
 582                         }
 583                 }
 584         }
 585         button_a_last = button_a;
 586         button_b_last = button_b;
 587         button_x_last = button_x;
 588         button_y_last = button_y;
 589         button_menu_last = button_menu;
 590         button_left_trigger_last = button_left_trigger;
 591         button_right_trigger_last = button_right_trigger;
 592         button_left_thumb_last = button_left_thumb;
 593         button_right_thumb_last = button_right_thumb;
 594         stick_left_x_last = stick_left_x;
 595         stick_left_y_last = stick_left_y;
 596         stick_right_x_last = stick_right_x;
 597         stick_right_y_last = stick_right_y;
 598         thrust_last = thrust;
 599         joystick_set_x_last = joystick_set_x;
 600         joystick_set_y_last = joystick_set_y;
 601
 602         /* we must handle keyboard after toggeling keyboard_on,
 603          * so that keyboard_on will not change until keyboard is rendered */
 604         vr_key = 0;
 605         if (keyboard_on)
 606                 handle_vr_keyboard(keyboard_on - 1, hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 607 }
 608 #endif
 609
 610 static void skip_intro(void)
 611 {
 612         int event;
 613         double render_delay = 0.0;
 614         double cycle_count;
 615
 616         if (intro_skipped)
 617                 return;
 618
 619         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 620         do {
 621                 /* render, if not delayed */
 622                 if (render_delay <= 0.0) {
 623                         cycle_count = 0;
 624                         do {
 625                                 cycle_count += execute_cpu(0, &event);
 626                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 627                         render_delay += (double)cycle_count / CPU_SPEED;
 628                 }
 629                 /* VBL */
 630                 execute_cpu(3, NULL);
 631                 /* count down render delay */
 632                 if (render_delay) {
 633                         render_delay -= 1.0 / (double)IRQ_RATE;
 634                         if (render_delay < 0.0)
 635                                 render_delay = 0.0;
 636                 }
 637         } while (event != STOP_AT_CLEAR_SCREEN1);
 638
 639         intro_skipped = 1;
 640 }
 641
 642 static void special_event(int event)
 643 {
 644 #ifdef HAVE_OVR
 645         /* handle VR events */
 646         if (event == STOP_AT_PATCH_VR) {
 647                 mercenary_patch_vr();
 648                 return;
 649         }
 650 #endif
 651         /* handle events to improve rendering */
 652         if (render_improved)
 653                 render_capture_event(event);
 654 }
 655
 656 static void main_loop(void)
 657 {
 658         double frame_step, frame_time = 0.0, frame_render = 1;
 659         int had_first_irq = 0;
 660         static uint32_t current_time, last_time = 0, diff;
 661         int i, rc;
 662         int space, length;
 663         int cycle_count, event = STOP_AT_END;
 664         double render_delay = 0.0;
 665         uint32_t palette_address;
 666         uint16_t palette[16];
 667 #ifdef HAVE_OVR
 668         int eye;
 669 #endif
 670
 671         last_time = ticks_sdl();
 672
 673         /* render result on window */
 674         while (!quit) {
 675 #ifdef HAVE_OVR
 676                 /* get vr poses */
 677                 handle_vr_poses();
 678 #endif
 679                 /* if we are in interstellar fligt, we use 50 Hz */
 680                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 681                 /* else we use whatever frame rate the user wants */
 682                 if (render_capture_is_interstellar())
 683                         frame_step = vbl_duration * 50.0;
 684                 else if (!intro_skipped)
 685                         frame_step = vbl_duration * 10.0;
 686                 else
 687                         frame_step = vbl_duration * config_fps;
 688                 if (frame_step > 1.0)
 689                         frame_step = 1.0;
 690                 /* handle SDL events */
 691                 rc = event_sdl();
 692                 if (rc)
 693                         break;
 694
 695                 /* initialize rendering */
 696                 debug_opengl = config_debug_opengl;
 697                 benson_size = config_benson_size;
 698                 render_legacy = (!config_render) || debug_opengl;
 699                 render_improved = config_render || debug_opengl;
 700                 if (!render_improved) {
 701                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 702                         render_capture_reset();
 703                 }
 704                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 705                 /* amgia speed: don't render if we still delay */
 706                 /* non amiga speed: render if we need a new frame */
 707                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 708                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 709                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 710                 if (((frame_render && !config_amiga_speed)
 711                   || (config_amiga_speed && render_delay <= 0.0)
 712                   || event == STOP_AT_WAIT_INPUT)
 713                 && !(had_first_irq && help_view)) {
 714                         frame_render = 0;
 715                         /* start capturing for improved graphics */
 716                         if (render_improved)
 717                                 render_capture_start(config_fov, config_improve_extend_roads, config_improve_smooth_planets, config_improve_stars_rotation, config_improve_fix_sky_rotation, config_debug_transparent);
 718
 719                         /* execute until the rendered image is ready (wait for VBL) */
 720                         cycle_count = 0;
 721                         do {
 722                                 cycle_count += execute_cpu(0, &event);
 723                                 /* handle special events */
 724                                 special_event(event);
 725                                 if (event == STOP_AT_CLEAR_SCREEN1)
 726                                         intro_skipped = 1;
 727                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 728                         /* stop capturing for improved graphics */
 729                         if (render_improved)
 730                                 render_capture_stop();
 731                         /* copy palette */
 732                         palette_address = mercenary_palette_view();
 733                         for (i = 0; i < 16; i++)
 734                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 735                         /* for amiga speed: set delay by the number of cycles */
 736                         if (config_amiga_speed)
 737                                 render_delay += (double)cycle_count / CPU_SPEED;
 738                 }
 739
 740                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 741 #ifdef HAVE_OVR
 742                 begin_render_ovr();
 743
 744                 for (eye = 0; eye < 2; eye++) {
 745                         double camera_x, camera_y, camera_z;
 746                         /* begin of rendering eye, viewport and frustum is set here */
 747                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 748 #else
 749                 {
 750 #endif
 751                         /* clear screen */
 752 #ifdef HAVE_OVR
 753                         opengl_clear(1);
 754 #else
 755                         opengl_clear(0);
 756 #endif
 757                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 758                         if (render_improved) {
 759 #ifndef HAVE_OVR
 760                                 /* viewport and frustum is set here */
 761                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 762 #endif
 763                                 /* render improved graphics, interpolate, if required,
 764                                  * if no item list is available, for legacy rendering
 765                                  */
 766 #ifdef HAVE_OVR
 767                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 1);
 768 #else
 769                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 0);
 770 #endif
 771                                 if (rc)
 772                                         goto goto_legacy;
 773 #ifdef HAVE_OVR
 774                                 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);
 775 #else
 776                                 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);
 777 #endif
 778                                 if (help_view)
 779 #ifdef HAVE_OVR
 780                                         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);
 781 #else
 782                                         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);
 783 #endif
 784                                 if (osd_timer) {
 785 #ifdef HAVE_OVR
 786                                         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);
 787 #else
 788                                         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);
 789 #endif
 790                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 791                                                 osd_timer = 0;
 792                                 }
 793                         }
 794                         /* setup viewport for legacy image and render image, if enabled */
 795                         /* also render legacy, if render_improved failed due to not (yet) available items */
 796                         if (render_legacy) {
 797                                 goto_legacy:
 798                                 /* render game view without benson
 799                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 800                                  */
 801                                 if (had_first_irq)
 802                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 803 #ifndef HAVE_OVR
 804                                 /* viewport and frustum is set here */
 805                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, 1.0);
 806 #endif
 807                                 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);
 808                                 if (help_view)
 809                                         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);
 810                                 if (osd_timer) {
 811                                         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);
 812                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 813                                                 osd_timer = 0;
 814                                 }
 815                         }
 816 #ifdef HAVE_OVR
 817                         /* render keyboard */
 818                         if (keyboard_on)
 819                                 render_vr_keyboard(keyboard_on - 1, camera_x, camera_y);
 820
 821                         /* end of rendering eye */
 822                         end_render_ovr_eye(eye);
 823                 }
 824                 /* at this point we are ready with our image, so we display */
 825                 end_render_ovr();
 826                 render_mirror_ovr(window_width, window_height);
 827 #else
 828                 }
 829 #endif
 830                 swap_sdl();
 831
 832                 /* advance frame time, if we are not in help view  */
 833                 if (!(had_first_irq && help_view)) {
 834                         frame_time += frame_step;
 835                         if (frame_time >= 1.0) {
 836                                 frame_time -= 1.0;
 837                                 frame_render = 1;
 838                         }
 839                 }
 840
 841                 /* measure frame rate */
 842                 framerate_measure();
 843
 844                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 845                 /* only do this, if we are not in help view */
 846                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 847                 if (!(had_first_irq && help_view)) {
 848                         current_time = ticks_sdl();
 849                         diff = current_time - last_time;
 850                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 851                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 852                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 853                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 854                         }
 855                         while (diff > 1000 / IRQ_RATE) {
 856                                 /* trigger and execute IRQ 3 = VBL */
 857                                 execute_cpu(3, NULL);
 858                                 had_first_irq = 1;
 859                                 /* transfer benson without game view
 860                                  * because we only got benson refreshed during VBL IRQ
 861                                  */
 862                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 863                                 /* render sound to sound buffer
 864                                  * buffer pointer read and write is atomic, so no locking required!
 865                                  */
 866                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 867                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 868 #ifdef DEBUG_SOUND_BUFFERING
 869                                         fprintf(stderr, "sound buffer overflow\n");
 870 #endif
 871                                         length = space;
 872                                 } else
 873                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 874 #ifdef DEBUG_SOUND_BUFFERING
 875                                 printf("can write %d, write %d\n", space, length);
 876                                 static int cnt = 0;
 877                                 int s;
 878                                 for (s = 0; s < length; s++) {
 879                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 880                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 881                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 882                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 883                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 884                                          cnt++;
 885                                 }
 886 #else
 887                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 888 #endif
 889                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 890                                 diff -= 1000 / IRQ_RATE;
 891                                 last_time += 1000 / IRQ_RATE;
 892
 893                                 /* count down render delay */
 894                                 if (render_delay) {
 895                                         render_delay -= 1.0 / (double)IRQ_RATE;
 896                                         if (render_delay < 0.0)
 897                                                 render_delay = 0.0;
 898                                 }
 899                         }
 900                 }
 901         }
 902 }
 903
 904 static uint16_t io_read(uint32_t address)
 905 {
 906         uint16_t value = 0xffff;
 907
 908         /* joystick and fire button */
 909         if (address == 0xbfe000 || address == 0xdff00c)
 910                 value &= emulate_joystick_read(address);
 911         /* keyboard */
 912         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 913                 value &= emulate_keyboard_read(address);
 914         /* diskette */
 915         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 916                 value &= emulate_disk_read(address);
 917
 918         return value;
 919 }
 920
 921 static void io_write(uint32_t address, uint16_t value)
 922 {
 923         /* dmacon and sound registers */
 924         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 925                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 926         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 927                 emulate_disk_write(address, value);
 928 }
 929
 930 /* two tracks with 0x1820 words of length */
 931 static uint8_t game_save[2][0x1820 << 1];
 932 static int last_track = 0;
 933
 934 /* game reads track with saved game */
 935 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 936 {
 937         if (length > sizeof(game_save[0])) {
 938                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 939                 return;
 940         }
 941
 942         /* if even track is selected, load game */
 943         if (!(track & 1)) {
 944                 char filename[256];
 945                 int gamesave_num = (track - 2) >> 1;
 946                 int got;
 947                 FILE *fp;
 948
 949                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 950 #if defined(_WIN32)
 951                 filename[0] = '\0';
 952 #else
 953                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 954                 mkdir(filename, 0777);
 955 #endif
 956                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 957                 fp = fopen(filename, "r");
 958                 if (!fp) {
 959 fail:
 960                         print_info("failed to load game from '%s'\n", filename);
 961                         goto copy;
 962                 }
 963                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 964                 fclose(fp);
 965                 if (got != 2)
 966                         goto fail;
 967         }
 968
 969 copy:
 970         /* copy track */
 971         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 972 }
 973
 974 /* game writes track with saved game */
 975 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 976 {
 977         /* skip sync info that is provided by game and only relevant for a real disk track */
 978         data += 0x200;
 979         length -= 0x200;
 980
 981         if (length != sizeof(game_save[0])) {
 982                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 983                 return;
 984         }
 985
 986         /* don't save if last track is the same, because disk is written on both sides with the same data */
 987         if (track == last_track) {
 988                 if (memcmp(memory + data, game_save[track & 1], length)) {
 989                         print_error("saving game data on other side of the disk is different, please fix!\n");
 990                 }
 991                 return;
 992         }
 993         last_track = track;
 994
 995         /* save game data */
 996         memcpy(game_save[track & 1], memory + data, length);
 997
 998         /* if done with saving */
 999         if ((track & 1)) {
1000                 char filename[256];
1001                 int gamesave_num = (track - 2) >> 1;
1002                 int wrote;
1003                 FILE *fp;
1004
1005 #if defined(_WIN32)
1006                 filename[0] = '\0';
1007 #else
1008                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
1009                 mkdir(filename, 0777);
1010 #endif
1011                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
1012                 fp = fopen(filename, "w");
1013                 if (!fp) {
1014 fail:
1015                         print_error("failed to save game to '%s'\n", filename);
1016                         return;
1017                 }
1018                 print_info("Game state saved to '%s'\n", filename);
1019                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
1020                 fclose(fp);
1021                 if (wrote != 2)
1022                         goto fail;
1023         }
1024 }
1025
1026 static int shift = 0, ctrl = 0;
1027
1028 static void keyboard_sdl(int down, enum keycode keycode)
1029 {
1030         switch (keycode) {
1031         case KEYCODE_LCTRL:
1032         case KEYCODE_RCTRL:
1033                 ctrl = down;
1034                 break;
1035         default: break;
1036         }
1037
1038         if (ctrl && down) {
1039                 switch (keycode) {
1040                 case KEYCODE_h:
1041                         if (help_view == help_views)
1042                                 help_view = 0;
1043                         else
1044                                 help_view++;
1045                         break;
1046                 case KEYCODE_v:
1047                         config_video_filter ^= 1;
1048                         osd_info("video filter", (config_video_filter) ? "on" : "off");
1049                         break;
1050                 case KEYCODE_a:
1051                         config_audio_filter ^= 1;
1052                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
1053                         break;
1054                 case KEYCODE_s:
1055                         config_amiga_speed ^= 1;
1056                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
1057                         break;
1058                 case KEYCODE_r:
1059                         config_render ^= 1;
1060                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
1061                         break;
1062                 case KEYCODE_b:
1063                         if (!config_render && !config_debug_opengl) {
1064                                 osd_info("", "not applicable");
1065                                 break;
1066                         }
1067                         if (config_benson_size == 0.5) {
1068                                 config_benson_size = 1.0;
1069                                 config_fov = FOV_NOVAGEN;
1070                         } else {
1071                                 config_benson_size = 0.5;
1072                                 config_fov = FOV_JOLLY;
1073                         }
1074                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
1075                         break;
1076                 case KEYCODE_i:
1077                         if (!intro_skipped)
1078                                 skip_intro();
1079                         else
1080                                 osd_info("", "not applicable");
1081                         break;
1082                 case KEYCODE_c:
1083                         if (config_ctrl_c)
1084                                 quit = 1;
1085                         break;
1086                 case KEYCODE_o:
1087 #ifdef HAVE_OVR
1088                         reset_observer_ovr();
1089                         osd_info("", "reset observer");
1090 #else
1091                         osd_info("", "not applicable");
1092 #endif
1093                         break;
1094                 case KEYCODE_KP_PLUS:
1095 #ifdef HAVE_OVR
1096                         osd_info("", "not applicable");
1097 #else
1098                         if (config_fov / 1.2 >= FOV_MIN)
1099                                 config_fov /= 1.2;
1100                         disp_fov:
1101                         {
1102                                 char text[16];
1103                                 sprintf(text, "%.2f", config_fov);
1104                                 osd_info("FOV", text);
1105                         }
1106 #endif
1107                         break;
1108                 case KEYCODE_KP_MINUS:
1109 #ifdef HAVE_OVR
1110                         osd_info("", "not applicable");
1111 #else
1112                         if (config_fov * 1.2 <= FOV_MAX)
1113                                 config_fov *= 1.2;
1114                         goto disp_fov;
1115 #endif
1116                         break;
1117                 default: break;
1118                 }
1119                 /* do not pass keys to game while holding CTRL */
1120                 return;
1121         }
1122
1123         if (keycode == KEYCODE_PAUSE && down) {
1124                 if (help_view == help_views)
1125                         help_view = 0;
1126                 else
1127                         help_view++;
1128         }
1129
1130         /* in help view we must not forward keypresses */
1131         if (help_view)
1132                 return;
1133
1134         switch (keycode) {
1135         case KEYCODE_LSHIFT:
1136                 set_amiga_key(keycode, down);
1137                 shift = down;
1138                 break;
1139         case KEYCODE_RSHIFT:
1140                 set_amiga_key(keycode, down);
1141                 shift = down;
1142                 break;
1143         case KEYCODE_LEFT:
1144                 if (shift && down) {
1145                         set_amiga_key(keycode, down);
1146                         set_joystick(-1, -1, -1, -1, -1);
1147                         break;
1148                 }
1149                 set_amiga_key(keycode, 0);
1150                 set_joystick(down, -1, -1, -1, -1);
1151                 break;
1152         case KEYCODE_RIGHT:
1153                 if (shift && down) {
1154                         set_amiga_key(keycode, down);
1155                         set_joystick(-1, -1, -1, -1, -1);
1156                         break;
1157                 }
1158                 set_amiga_key(keycode, 0);
1159                 set_joystick(-1, down, -1, -1, -1);
1160                 break;
1161         case KEYCODE_UP:
1162                 if (shift && down) {
1163                         set_amiga_key(keycode, down);
1164                         set_joystick(-1, -1, -1, -1, -1);
1165                         break;
1166                 }
1167                 set_amiga_key(keycode, 0);
1168                 set_joystick(-1, -1, down, -1, -1);
1169                 break;
1170         case KEYCODE_DOWN:
1171                 if (shift && down) {
1172                         set_amiga_key(keycode, down);
1173                         set_joystick(-1, -1, -1, -1, -1);
1174                         break;
1175                 }
1176                 set_amiga_key(keycode, 0);
1177                 set_joystick(-1, -1, -1, down, -1);
1178                 break;
1179         case KEYCODE_END:
1180                 set_joystick(-1, -1, -1, -1, down);
1181                 break;
1182         case KEYCODE_INSERT:
1183                 set_amiga_key(KEYCODE_HELP, down);
1184                 break;
1185         default:
1186                 set_amiga_key(keycode, down);
1187         }
1188 }
1189
1190 void audio_sdl(float *data, int length)
1191 {
1192         int fill, s;
1193
1194         /* read sound from sound buffer
1195          * buffer pointer read and write is atomic, so no locking required!
1196          */
1197         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1198         if (fill < length) {
1199 #ifdef DEBUG_SOUND_BUFFERING
1200                 fprintf(stderr, "sound buffer underrun\n");
1201 #endif
1202                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1203                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1204         }
1205         for (s = 0; s < length; s++) {
1206                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1207                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1208         }
1209 #ifdef DEBUG_SOUND_BUFFERING
1210         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1211 #endif
1212         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1213 }
1214
1215 void sound_irq(void)
1216 {
1217         /* trigger and execute IRQ 4 = sound */
1218         execute_cpu(4, NULL);
1219 }
1220
1221 int main(int argc, char *argv[])
1222 {
1223         int rc;
1224         int sdl_sound_chunk;
1225
1226         home_dir = getenv("HOME");
1227         if (!home_dir)
1228                 home_dir = "";
1229
1230         rc = parse_args(argc, argv);
1231         if (rc)
1232                 return 0;
1233
1234         /* allocate image */
1235         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1236         if (!image) {
1237                 print_error("Failed to allocate image buffer\n");
1238                 goto done;
1239         }
1240
1241         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1242                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1243                 goto done;
1244         }
1245         if ((1000 % IRQ_RATE)) {
1246                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1247                 goto done;
1248         }
1249
1250         /* calculate SDL chunk size for audio
1251          * it must be a power of two, but not more than the chunk size for each IRQ!
1252          */
1253         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1254                 ;
1255         sdl_sound_chunk >>= 1;
1256 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1257
1258         /* allocate sound buffers */
1259         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1260         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1261         if (!sound_buffer) {
1262                 print_error("Failed to allocate image buffer\n");
1263                 goto done;
1264         }
1265
1266         /* allocate memory */
1267         memory = calloc(MEMORY_SIZE, 1);
1268         if (!memory) {
1269                 print_error("Failed to allocate cpu's memory\n");
1270                 goto done;
1271         }
1272         stop_event = calloc(MEMORY_SIZE, 1);
1273         if (!stop_event) {
1274                 print_error("Failed to allocate cpu's stop_event memory\n");
1275                 goto done;
1276         }
1277         chipreg = calloc(IOSIZE, 1);
1278         if (!chipreg) {
1279                 print_error("Failed to allocate chip register\n");
1280                 goto done;
1281         }
1282
1283         /* init cpu code */
1284         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1285
1286         /* init disk emulation */
1287         disk_init(disk_read, disk_write);
1288
1289         /* load binary */
1290         mercenary_load();
1291
1292         /* patch some stuff */
1293         mercenary_patch();
1294
1295         /* init SDL and OpenGL */
1296 #ifdef HAVE_OVR
1297         int vbl_sync = 0;
1298         int rift = 1;
1299         int multisampling = 0;
1300         window_width = SCREEN_WIDTH;
1301         window_height = SCREEN_HEIGHT;
1302 #else
1303         int vbl_sync = 1;
1304         int rift = 0;
1305         int multisampling = config_multisampling;
1306         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1307         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1308 #endif
1309         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, multisampling, vbl_sync, rift);
1310         if (rc < 0)
1311                 goto done;
1312 #ifdef HAVE_OVR
1313         rc = init_ovr(config_multisampling);
1314         if (rc < 0)
1315                 goto done;
1316         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1317         if (rc < 0)
1318                 goto done;
1319 #endif
1320         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1321         if (rc < 0)
1322                 goto done;
1323
1324         /* init osd */
1325         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1326         if (rc < 0)
1327                 goto done;
1328         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1329         if (rc < 0)
1330                 goto done;
1331         help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1332         if (!help_osd[0])
1333                 goto done;
1334         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);
1335         text_render(help_osd[0], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1336                 "Emulation:\n"
1337                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1338                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1339                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1340                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1341                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1342                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1343                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1344                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1345                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1346 #ifdef HAVE_OVR
1347                 "        Press `CTRL' + `O' (or both triggers) to reset observer position.\n"
1348 #endif
1349                 "\n"
1350                 "Answer to a Question:\n"
1351                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1352                 "\n"
1353                 "Walking / Driving / Flying:\n"
1354                 "        Use cursor keys as joystick, to move player / craft.\n"
1355                 "        Press `R' for running, 'W' for walking speed.\n"
1356                 "        Press `B' to board, `L' to leave.\n"
1357                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1358                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1359                 "        Press `SPACE' to stop craft.\n"
1360                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1361                 "        Press `T' for turbo on certain craft.\n"
1362                 "        Press `END' as joystick's fire button.\n"
1363                 "\n"
1364                 "Elevator:\n"
1365                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1366                 "\n"
1367                 "Inside a transporter:\n"
1368                 "        Press `1'...`0' to select destination.\n"
1369                 "\n"
1370                 "Items:\n"
1371                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1372                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1373                 "        Press `NUMPAD Enter' to select certain items.\n"
1374                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1375                 "        Press `NUMPAD *' to read entry\n"
1376                 "Saving / Loading / Pause:\n"
1377                 "        Press `INSERT' to loading and saving options.\n"
1378                 "        Press `ENTER' to pause game, other key to continue.\n"
1379                 ,HELP_ALPHA, 1, 2, 5, 0);
1380 #ifdef HAVE_OVR
1381         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1382         if (!help_osd[1])
1383                 goto done;
1384         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);
1385         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1386                 "Emulation using Controller:\n"
1387                 "        Press `Enter' button to toggle this help screen on or off.\n"
1388                 "        Press `A' button to emulate keyboard to control game.\n"
1389                 "        Press `B' button to emulate keyboard to enter alphanumeric keys.\n"
1390                 "        Press `A' or `B' button again to dismiss keyboard.\n"
1391                 "        Point right controller to a key on keyboard. The key will highlight.\n"
1392                 "        Pull `Trigger' on right controller enter the highlighted key.\n"
1393                 "        Pull `Trigger' on both controllers to reset observer position.\n"
1394                 "\n"
1395                 "Walking / Driving / Flying using Controller:\n"
1396                 "        Use thumb stick on right controller, to move player / craft.\n"
1397                 "        Point right controller towards the direction to walk to.\n"
1398                 "        Press thumb stick to change orientation to that direction.\n"
1399                 "        Press `X' button to board, `Y' button to leave.\n"
1400                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1401                 "        Press thumb stick on left controller stop craft.\n"
1402                 "        Press thumb stick on left controller for escape sequence, after stop.\n"
1403                 "        Pull `Trigger' on right controller to fire.\n"
1404                 "\n"
1405                 "For all other game function, use the emulated keyboards!\n"
1406                 ,HELP_ALPHA, 1, 2, 5, 0);
1407         help_views = 2;
1408 #endif
1409         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1410         if (!info_osd)
1411                 goto done;
1412
1413         /* init audio */
1414         sound_init(SOUND_SAMPLERATE, sound_irq);
1415
1416         /* start cpu */
1417         reset_cpu();
1418
1419         if (config_skip_intro)
1420                 skip_intro();
1421
1422         /* run game */
1423         main_loop();
1424
1425 done:
1426         exit_opengl();
1427 #ifdef HAVE_OVR
1428         exit_ovr();
1429 #endif
1430         exit_sdl();
1431
1432         if (chipreg)
1433                 free(chipreg);
1434         if (stop_event)
1435                 free(stop_event);
1436         if (memory)
1437                 free(memory);
1438         if (sound_buffer)
1439                 free(sound_buffer);
1440         if (image)
1441                 free(image);
1442         if (help_osd[0])
1443                 free(help_osd[0]);
1444         if (help_osd[1])
1445                 free(help_osd[1]);
1446         if (info_osd)
1447                 free(info_osd);
1448
1449         return 0;
1450 }
1451