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         int all_white = 0;
 668 #ifdef HAVE_OVR
 669         int eye;
 670 #endif
 671
 672         last_time = ticks_sdl();
 673
 674         /* render result on window */
 675         while (!quit) {
 676 #ifdef HAVE_OVR
 677                 /* get vr poses */
 678                 handle_vr_poses();
 679 #endif
 680                 /* if we are in interstellar fligt, we use 50 Hz */
 681                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 682                 /* else we use whatever frame rate the user wants */
 683                 if (render_capture_is_interstellar())
 684                         frame_step = vbl_duration * 50.0;
 685                 else if (!intro_skipped)
 686                         frame_step = vbl_duration * 10.0;
 687                 else
 688                         frame_step = vbl_duration * config_fps;
 689                 if (frame_step > 1.0)
 690                         frame_step = 1.0;
 691                 /* handle SDL events */
 692                 rc = event_sdl();
 693                 if (rc)
 694                         break;
 695
 696                 /* initialize rendering */
 697                 debug_opengl = config_debug_opengl;
 698                 benson_size = config_benson_size;
 699                 render_legacy = (!config_render) || debug_opengl;
 700                 render_improved = config_render || debug_opengl;
 701                 if (!render_improved) {
 702                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 703                         render_capture_reset();
 704                 }
 705                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 706                 /* amgia speed: don't render if we still delay */
 707                 /* non amiga speed: render if we need a new frame */
 708                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 709                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 710                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 711                 if (((frame_render && !config_amiga_speed)
 712                   || (config_amiga_speed && render_delay <= 0.0)
 713                   || event == STOP_AT_WAIT_INPUT)
 714                 && !(had_first_irq && help_view)) {
 715                         frame_render = 0;
 716                         /* start capturing for improved graphics */
 717                         if (render_improved)
 718                                 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);
 719
 720                         /* execute until the rendered image is ready (wait for VBL) */
 721                         cycle_count = 0;
 722                         do {
 723                                 cycle_count += execute_cpu(0, &event);
 724                                 /* handle special events */
 725                                 special_event(event);
 726                                 if (event == STOP_AT_CLEAR_SCREEN1)
 727                                         intro_skipped = 1;
 728                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 729                         /* stop capturing for improved graphics */
 730                         if (render_improved)
 731                                 render_capture_stop();
 732                         /* copy palette */
 733                         palette_address = mercenary_palette_view();
 734                         for (i = 0; i < 16; i++)
 735                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 736                         /* for amiga speed: set delay by the number of cycles */
 737                         if (config_amiga_speed)
 738                                 render_delay += (double)cycle_count / CPU_SPEED;
 739                 }
 740
 741                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 742 #ifdef HAVE_OVR
 743                 begin_render_ovr();
 744
 745                 for (eye = 0; eye < 2; eye++) {
 746                         double camera_x, camera_y, camera_z;
 747                         /* begin of rendering eye, viewport and frustum is set here */
 748                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 749 #else
 750                 {
 751 #endif
 752                         /* clear screen */
 753 #ifdef HAVE_OVR
 754                         opengl_clear(1);
 755 #else
 756                         opengl_clear(0);
 757 #endif
 758                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 759                         if (render_improved) {
 760 #ifndef HAVE_OVR
 761                                 /* viewport and frustum is set here */
 762                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 763 #endif
 764                                 /* render improved graphics, interpolate, if required,
 765                                  * if no item list is available, for legacy rendering
 766                                  */
 767 #ifdef HAVE_OVR
 768                                 if (all_white)
 769                                         rc = render_all_white(1);
 770                                 else
 771                                         rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 1);
 772 #else
 773                                 if (all_white)
 774                                         rc = render_all_white(0);
 775                                 else
 776                                         rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 0);
 777 #endif
 778                                 if (rc)
 779                                         goto goto_legacy;
 780 #ifdef HAVE_OVR
 781                                 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);
 782 #else
 783                                 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);
 784 #endif
 785                                 if (help_view)
 786 #ifdef HAVE_OVR
 787                                         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);
 788 #else
 789                                         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);
 790 #endif
 791                                 if (osd_timer) {
 792 #ifdef HAVE_OVR
 793                                         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);
 794 #else
 795                                         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);
 796 #endif
 797                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 798                                                 osd_timer = 0;
 799                                 }
 800                         }
 801                         /* setup viewport for legacy image and render image, if enabled */
 802                         /* also render legacy, if render_improved failed due to not (yet) available items */
 803                         if (render_legacy) {
 804                                 goto_legacy:
 805                                 /* render game view without benson
 806                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 807                                  */
 808                                 if (had_first_irq)
 809                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 810 #ifndef HAVE_OVR
 811                                 /* viewport and frustum is set here */
 812                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, 1.0);
 813 #endif
 814                                 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);
 815                                 if (help_view)
 816                                         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);
 817                                 if (osd_timer) {
 818                                         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);
 819                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 820                                                 osd_timer = 0;
 821                                 }
 822                         }
 823 #ifdef HAVE_OVR
 824                         /* render keyboard */
 825                         if (keyboard_on)
 826                                 render_vr_keyboard(keyboard_on - 1, camera_x, camera_y);
 827
 828                         /* end of rendering eye */
 829                         end_render_ovr_eye(eye);
 830                 }
 831                 /* at this point we are ready with our image, so we display */
 832                 end_render_ovr();
 833                 render_mirror_ovr(window_width, window_height);
 834 #else
 835                 }
 836 #endif
 837                 swap_sdl();
 838
 839                 /* advance frame time, if we are not in help view  */
 840                 if (!(had_first_irq && help_view)) {
 841                         frame_time += frame_step;
 842                         if (frame_time >= 1.0) {
 843                                 frame_time -= 1.0;
 844                                 frame_render = 1;
 845                         }
 846                 }
 847
 848                 /* measure frame rate */
 849                 framerate_measure();
 850
 851                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 852                 /* only do this, if we are not in help view */
 853                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 854                 if (!(had_first_irq && help_view)) {
 855                         current_time = ticks_sdl();
 856                         diff = current_time - last_time;
 857                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 858                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 859                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 860                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 861                         }
 862                         while (diff > 1000 / IRQ_RATE) {
 863                                 /* trigger and execute IRQ 3 = VBL */
 864                                 execute_cpu(3, NULL);
 865                                 had_first_irq = 1;
 866                                 /* transfer benson without game view
 867                                  * because we only got benson refreshed during VBL IRQ
 868                                  */
 869                                 all_white = emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 870                                 /* render sound to sound buffer
 871                                  * buffer pointer read and write is atomic, so no locking required!
 872                                  */
 873                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 874                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 875 #ifdef DEBUG_SOUND_BUFFERING
 876                                         fprintf(stderr, "sound buffer overflow\n");
 877 #endif
 878                                         length = space;
 879                                 } else
 880                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 881 #ifdef DEBUG_SOUND_BUFFERING
 882                                 printf("can write %d, write %d\n", space, length);
 883                                 static int cnt = 0;
 884                                 int s;
 885                                 for (s = 0; s < length; s++) {
 886                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 887                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 888                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 889                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 890                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 891                                          cnt++;
 892                                 }
 893 #else
 894                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 895 #endif
 896                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 897                                 diff -= 1000 / IRQ_RATE;
 898                                 last_time += 1000 / IRQ_RATE;
 899
 900                                 /* count down render delay */
 901                                 if (render_delay) {
 902                                         render_delay -= 1.0 / (double)IRQ_RATE;
 903                                         if (render_delay < 0.0)
 904                                                 render_delay = 0.0;
 905                                 }
 906                         }
 907                 }
 908         }
 909 }
 910
 911 static uint16_t io_read(uint32_t address)
 912 {
 913         uint16_t value = 0xffff;
 914
 915         /* joystick and fire button */
 916         if (address == 0xbfe000 || address == 0xdff00c)
 917                 value &= emulate_joystick_read(address);
 918         /* keyboard */
 919         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 920                 value &= emulate_keyboard_read(address);
 921         /* diskette */
 922         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 923                 value &= emulate_disk_read(address);
 924
 925         return value;
 926 }
 927
 928 static void io_write(uint32_t address, uint16_t value)
 929 {
 930         /* dmacon and sound registers */
 931         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 932                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 933         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 934                 emulate_disk_write(address, value);
 935 }
 936
 937 /* two tracks with 0x1820 words of length */
 938 static uint8_t game_save[2][0x1820 << 1];
 939 static int last_track = 0;
 940
 941 /* game reads track with saved game */
 942 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 943 {
 944         if (length > sizeof(game_save[0])) {
 945                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 946                 return;
 947         }
 948
 949         /* if even track is selected, load game */
 950         if (!(track & 1)) {
 951                 char filename[256];
 952                 int gamesave_num = (track - 2) >> 1;
 953                 int got;
 954                 FILE *fp;
 955
 956                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 957 #if defined(_WIN32)
 958                 filename[0] = '\0';
 959 #else
 960                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 961                 mkdir(filename, 0777);
 962 #endif
 963                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 964                 fp = fopen(filename, "r");
 965                 if (!fp) {
 966 fail:
 967                         print_info("failed to load game from '%s'\n", filename);
 968                         goto copy;
 969                 }
 970                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 971                 fclose(fp);
 972                 if (got != 2)
 973                         goto fail;
 974         }
 975
 976 copy:
 977         /* copy track */
 978         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 979 }
 980
 981 /* game writes track with saved game */
 982 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 983 {
 984         /* skip sync info that is provided by game and only relevant for a real disk track */
 985         data += 0x200;
 986         length -= 0x200;
 987
 988         if (length != sizeof(game_save[0])) {
 989                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 990                 return;
 991         }
 992
 993         /* don't save if last track is the same, because disk is written on both sides with the same data */
 994         if (track == last_track) {
 995                 if (memcmp(memory + data, game_save[track & 1], length)) {
 996                         print_error("saving game data on other side of the disk is different, please fix!\n");
 997                 }
 998                 return;
 999         }
1000         last_track = track;
1001
1002         /* save game data */
1003         memcpy(game_save[track & 1], memory + data, length);
1004
1005         /* if done with saving */
1006         if ((track & 1)) {
1007                 char filename[256];
1008                 int gamesave_num = (track - 2) >> 1;
1009                 int wrote;
1010                 FILE *fp;
1011
1012 #if defined(_WIN32)
1013                 filename[0] = '\0';
1014 #else
1015                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
1016                 mkdir(filename, 0777);
1017 #endif
1018                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
1019                 fp = fopen(filename, "w");
1020                 if (!fp) {
1021 fail:
1022                         print_error("failed to save game to '%s'\n", filename);
1023                         return;
1024                 }
1025                 print_info("Game state saved to '%s'\n", filename);
1026                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
1027                 fclose(fp);
1028                 if (wrote != 2)
1029                         goto fail;
1030         }
1031 }
1032
1033 static int shift = 0, ctrl = 0;
1034
1035 static void keyboard_sdl(int down, enum keycode keycode)
1036 {
1037         switch (keycode) {
1038         case KEYCODE_LCTRL:
1039         case KEYCODE_RCTRL:
1040                 ctrl = down;
1041                 break;
1042         default: break;
1043         }
1044
1045         if (ctrl && down) {
1046                 switch (keycode) {
1047                 case KEYCODE_h:
1048                         if (help_view == help_views)
1049                                 help_view = 0;
1050                         else
1051                                 help_view++;
1052                         break;
1053                 case KEYCODE_v:
1054                         config_video_filter ^= 1;
1055                         osd_info("video filter", (config_video_filter) ? "on" : "off");
1056                         break;
1057                 case KEYCODE_a:
1058                         config_audio_filter ^= 1;
1059                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
1060                         break;
1061                 case KEYCODE_s:
1062                         config_amiga_speed ^= 1;
1063                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
1064                         break;
1065                 case KEYCODE_r:
1066                         config_render ^= 1;
1067                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
1068                         break;
1069                 case KEYCODE_b:
1070                         if (!config_render && !config_debug_opengl) {
1071                                 osd_info("", "not applicable");
1072                                 break;
1073                         }
1074                         if (config_benson_size == 0.5) {
1075                                 config_benson_size = 1.0;
1076                                 config_fov = FOV_NOVAGEN;
1077                         } else {
1078                                 config_benson_size = 0.5;
1079                                 config_fov = FOV_JOLLY;
1080                         }
1081                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
1082                         break;
1083                 case KEYCODE_i:
1084                         if (!intro_skipped)
1085                                 skip_intro();
1086                         else
1087                                 osd_info("", "not applicable");
1088                         break;
1089                 case KEYCODE_c:
1090                         if (config_ctrl_c)
1091                                 quit = 1;
1092                         break;
1093                 case KEYCODE_o:
1094 #ifdef HAVE_OVR
1095                         reset_observer_ovr();
1096                         osd_info("", "reset observer");
1097 #else
1098                         osd_info("", "not applicable");
1099 #endif
1100                         break;
1101                 case KEYCODE_KP_PLUS:
1102 #ifdef HAVE_OVR
1103                         osd_info("", "not applicable");
1104 #else
1105                         if (config_fov / 1.2 >= FOV_MIN)
1106                                 config_fov /= 1.2;
1107                         disp_fov:
1108                         {
1109                                 char text[16];
1110                                 sprintf(text, "%.2f", config_fov);
1111                                 osd_info("FOV", text);
1112                         }
1113 #endif
1114                         break;
1115                 case KEYCODE_KP_MINUS:
1116 #ifdef HAVE_OVR
1117                         osd_info("", "not applicable");
1118 #else
1119                         if (config_fov * 1.2 <= FOV_MAX)
1120                                 config_fov *= 1.2;
1121                         goto disp_fov;
1122 #endif
1123                         break;
1124                 default: break;
1125                 }
1126                 /* do not pass keys to game while holding CTRL */
1127                 return;
1128         }
1129
1130         if (keycode == KEYCODE_PAUSE && down) {
1131                 if (help_view == help_views)
1132                         help_view = 0;
1133                 else
1134                         help_view++;
1135         }
1136
1137         /* in help view we must not forward keypresses */
1138         if (help_view)
1139                 return;
1140
1141         switch (keycode) {
1142         case KEYCODE_LSHIFT:
1143                 set_amiga_key(keycode, down);
1144                 shift = down;
1145                 break;
1146         case KEYCODE_RSHIFT:
1147                 set_amiga_key(keycode, down);
1148                 shift = down;
1149                 break;
1150         case KEYCODE_LEFT:
1151                 if (shift && down) {
1152                         set_amiga_key(keycode, down);
1153                         set_joystick(-1, -1, -1, -1, -1);
1154                         break;
1155                 }
1156                 set_amiga_key(keycode, 0);
1157                 set_joystick(down, -1, -1, -1, -1);
1158                 break;
1159         case KEYCODE_RIGHT:
1160                 if (shift && down) {
1161                         set_amiga_key(keycode, down);
1162                         set_joystick(-1, -1, -1, -1, -1);
1163                         break;
1164                 }
1165                 set_amiga_key(keycode, 0);
1166                 set_joystick(-1, down, -1, -1, -1);
1167                 break;
1168         case KEYCODE_UP:
1169                 if (shift && down) {
1170                         set_amiga_key(keycode, down);
1171                         set_joystick(-1, -1, -1, -1, -1);
1172                         break;
1173                 }
1174                 set_amiga_key(keycode, 0);
1175                 set_joystick(-1, -1, down, -1, -1);
1176                 break;
1177         case KEYCODE_DOWN:
1178                 if (shift && down) {
1179                         set_amiga_key(keycode, down);
1180                         set_joystick(-1, -1, -1, -1, -1);
1181                         break;
1182                 }
1183                 set_amiga_key(keycode, 0);
1184                 set_joystick(-1, -1, -1, down, -1);
1185                 break;
1186         case KEYCODE_END:
1187                 set_joystick(-1, -1, -1, -1, down);
1188                 break;
1189         case KEYCODE_INSERT:
1190                 set_amiga_key(KEYCODE_HELP, down);
1191                 break;
1192         default:
1193                 set_amiga_key(keycode, down);
1194         }
1195 }
1196
1197 void audio_sdl(float *data, int length)
1198 {
1199         int fill, s;
1200
1201         /* read sound from sound buffer
1202          * buffer pointer read and write is atomic, so no locking required!
1203          */
1204         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1205         if (fill < length) {
1206 #ifdef DEBUG_SOUND_BUFFERING
1207                 fprintf(stderr, "sound buffer underrun\n");
1208 #endif
1209                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1210                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1211         }
1212         for (s = 0; s < length; s++) {
1213                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1214                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1215         }
1216 #ifdef DEBUG_SOUND_BUFFERING
1217         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1218 #endif
1219         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1220 }
1221
1222 void sound_irq(void)
1223 {
1224         /* trigger and execute IRQ 4 = sound */
1225         execute_cpu(4, NULL);
1226 }
1227
1228 int main(int argc, char *argv[])
1229 {
1230         int rc;
1231         int sdl_sound_chunk;
1232
1233         home_dir = getenv("HOME");
1234         if (!home_dir)
1235                 home_dir = "";
1236
1237         rc = parse_args(argc, argv);
1238         if (rc)
1239                 return 0;
1240
1241         /* allocate image */
1242         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1243         if (!image) {
1244                 print_error("Failed to allocate image buffer\n");
1245                 goto done;
1246         }
1247
1248         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1249                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1250                 goto done;
1251         }
1252         if ((1000 % IRQ_RATE)) {
1253                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1254                 goto done;
1255         }
1256
1257         /* calculate SDL chunk size for audio
1258          * it must be a power of two, but not more than the chunk size for each IRQ!
1259          */
1260         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1261                 ;
1262         sdl_sound_chunk >>= 1;
1263 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1264
1265         /* allocate sound buffers */
1266         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1267         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1268         if (!sound_buffer) {
1269                 print_error("Failed to allocate image buffer\n");
1270                 goto done;
1271         }
1272
1273         /* allocate memory */
1274         memory = calloc(MEMORY_SIZE, 1);
1275         if (!memory) {
1276                 print_error("Failed to allocate cpu's memory\n");
1277                 goto done;
1278         }
1279         stop_event = calloc(MEMORY_SIZE, 1);
1280         if (!stop_event) {
1281                 print_error("Failed to allocate cpu's stop_event memory\n");
1282                 goto done;
1283         }
1284         chipreg = calloc(IOSIZE, 1);
1285         if (!chipreg) {
1286                 print_error("Failed to allocate chip register\n");
1287                 goto done;
1288         }
1289
1290         /* init cpu code */
1291         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1292
1293         /* init disk emulation */
1294         disk_init(disk_read, disk_write);
1295
1296         /* load binary */
1297         mercenary_load();
1298
1299         /* patch some stuff */
1300         mercenary_patch();
1301
1302         /* init SDL and OpenGL */
1303 #ifdef HAVE_OVR
1304         int vbl_sync = 0;
1305         int rift = 1;
1306         int multisampling = 0;
1307         window_width = SCREEN_WIDTH;
1308         window_height = SCREEN_HEIGHT;
1309 #else
1310         int vbl_sync = 1;
1311         int rift = 0;
1312         int multisampling = config_multisampling;
1313         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1314         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1315 #endif
1316         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, multisampling, vbl_sync, rift);
1317         if (rc < 0)
1318                 goto done;
1319 #ifdef HAVE_OVR
1320         rc = init_ovr(config_multisampling);
1321         if (rc < 0)
1322                 goto done;
1323         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1324         if (rc < 0)
1325                 goto done;
1326 #endif
1327         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1328         if (rc < 0)
1329                 goto done;
1330
1331         /* init osd */
1332         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1333         if (rc < 0)
1334                 goto done;
1335         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1336         if (rc < 0)
1337                 goto done;
1338         help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1339         if (!help_osd[0])
1340                 goto done;
1341         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);
1342         text_render(help_osd[0], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1343                 "Emulation:\n"
1344                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1345                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1346                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1347                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1348                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1349                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1350                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1351                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1352                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1353 #ifdef HAVE_OVR
1354                 "        Press `CTRL' + `O' (or both triggers) to reset observer position.\n"
1355 #endif
1356                 "\n"
1357                 "Answer to a Question:\n"
1358                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1359                 "\n"
1360                 "Walking / Driving / Flying:\n"
1361                 "        Use cursor keys as joystick, to move player / craft.\n"
1362                 "        Press `R' for running, 'W' for walking speed.\n"
1363                 "        Press `B' to board, `L' to leave.\n"
1364                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1365                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1366                 "        Press `SPACE' to stop craft.\n"
1367                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1368                 "        Press `T' for turbo on certain craft.\n"
1369                 "        Press `END' as joystick's fire button.\n"
1370                 "\n"
1371                 "Elevator:\n"
1372                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1373                 "\n"
1374                 "Inside a transporter:\n"
1375                 "        Press `1'...`0' to select destination.\n"
1376                 "\n"
1377                 "Items:\n"
1378                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1379                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1380                 "        Press `NUMPAD Enter' to select certain items.\n"
1381                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1382                 "        Press `NUMPAD *' to read entry\n"
1383                 "Saving / Loading / Pause:\n"
1384                 "        Press `INSERT' to loading and saving options.\n"
1385                 "        Press `ENTER' to pause game, other key to continue.\n"
1386                 ,HELP_ALPHA, 1, 2, 5, 0);
1387 #ifdef HAVE_OVR
1388         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1389         if (!help_osd[1])
1390                 goto done;
1391         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);
1392         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1393                 "Emulation using Controller:\n"
1394                 "        Press `Enter' button to toggle this help screen on or off.\n"
1395                 "        Press `A' button to emulate keyboard to control game.\n"
1396                 "        Press `B' button to emulate keyboard to enter alphanumeric keys.\n"
1397                 "        Press `A' or `B' button again to dismiss keyboard.\n"
1398                 "        Point right controller to a key on keyboard. The key will highlight.\n"
1399                 "        Pull `Trigger' on right controller enter the highlighted key.\n"
1400                 "        Pull `Trigger' on both controllers to reset observer position.\n"
1401                 "\n"
1402                 "Walking / Driving / Flying using Controller:\n"
1403                 "        Use thumb stick on right controller, to move player / craft.\n"
1404                 "        Point right controller towards the direction to walk to.\n"
1405                 "        Press thumb stick to change orientation to that direction.\n"
1406                 "        Press `X' button to board, `Y' button to leave.\n"
1407                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1408                 "        Press thumb stick on left controller stop craft.\n"
1409                 "        Press thumb stick on left controller for escape sequence, after stop.\n"
1410                 "        Pull `Trigger' on right controller to fire.\n"
1411                 "\n"
1412                 "For all other game function, use the emulated keyboards!\n"
1413                 ,HELP_ALPHA, 1, 2, 5, 0);
1414         help_views = 2;
1415 #endif
1416         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1417         if (!info_osd)
1418                 goto done;
1419
1420         /* init audio */
1421         sound_init(SOUND_SAMPLERATE, sound_irq);
1422
1423         /* start cpu */
1424         reset_cpu();
1425
1426         if (config_skip_intro)
1427                 skip_intro();
1428
1429         /* run game */
1430         main_loop();
1431
1432 done:
1433         exit_opengl();
1434 #ifdef HAVE_OVR
1435         exit_ovr();
1436 #endif
1437         exit_sdl();
1438
1439         if (chipreg)
1440                 free(chipreg);
1441         if (stop_event)
1442                 free(stop_event);
1443         if (memory)
1444                 free(memory);
1445         if (sound_buffer)
1446                 free(sound_buffer);
1447         if (image)
1448                 free(image);
1449         if (help_osd[0])
1450                 free(help_osd[0]);
1451         if (help_osd[1])
1452                 free(help_osd[1]);
1453         if (info_osd)
1454                 free(info_osd);
1455
1456         return 0;
1457 }
1458