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 <sys/stat.h>
  25 #include <sys/types.h>
  26 #include "../../include/keycodes.h"
  27 #include "../libsdl/sdl.h"
  28 #ifdef HAVE_OVR
  29 #include "../libovr/ovr.h"
  30 #include "../libovr/keyboard.h"
  31 #endif
  32 #include "../libsdl/opengl.h"
  33 #include "../libsdl/print.h"
  34 #include "../libcpu/m68k.h"
  35 #include "../libcpu/execute.h"
  36 #include "../libframerate/framerate.h"
  37 #include "../libvideo/video.h"
  38 #include "../libsound/sound.h"
  39 #include "../libjoystick/joystick.h"
  40 #include "../libkeyboard/keyboard.h"
  41 #include "../libdisk/disk.h"
  42 #include "../libtext/text.h"
  43 #include "mercenary.h"
  44 #include "render.h"
  45
  46 #define FOV_MIN         10.0
  47 #define FOV_NOVAGEN     64.0
  48 #define FOV_JOLLY       80.0
  49 #define FOV_MAX         170.0
  50
  51 static int config_ctrl_c = 0;
  52 static int config_amiga_speed = 0; /* fast speed */
  53 static double config_fps = 16.0;
  54 #if !defined(_WIN32)
  55 static const char *config_gamesave_dir = ".mercenary";
  56 #endif
  57 static int config_video_filter = 1;
  58 static int config_audio_filter = 1;
  59 static int config_render = 1; /* opengl render */
  60 static int config_skip_intro = 0;
  61 static int config_multisampling = 8;
  62 static double config_fov = FOV_NOVAGEN;
  63 static double config_monitor_distance = 31.5; /* inch */
  64 #ifdef HAVE_OVR
  65 static double config_keyboard_distance = 28.5; /* inch */
  66 static double config_keyboard_height = 10.0; /* inch */
  67 #endif
  68 static double config_benson_size = 1.0;
  69 static int config_debug_transparent = 0;
  70 static int config_debug_opengl = 0;
  71 /* render improvements */
  72 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  73 static int config_improve_smooth_planets = 1;   /* set to 1 to rotate planets smoothly */
  74
  75 #define CPU_SPEED       7093790.0;
  76
  77 #define SOUND_SAMPLERATE 48000
  78 /* - game IRQ rate
  79  * - must be used for sound rendering chunk
  80  */
  81 #define IRQ_RATE        50
  82 /* numbe of buffer chunks to dejitter:
  83  * - SDL render interval
  84  * - sound rendering interval
  85  * - sound card interval
  86  * 4 should be minimum, if video rate is >=50 Hz
  87  */
  88 #define SOUND_CHUNKS    4
  89
  90 /* test sound to check if buffer does not overflow / underrun */
  91 //#define DEBUG_SOUND_BUFFERING
  92
  93 #define IOSIZE          0x1000 /* bytes in io space */
  94 #define MEMORY_SIZE     0x80000
  95 static uint8_t *memory = NULL;
  96 static uint8_t *stop_event = NULL;
  97 static uint8_t *image = NULL;
  98 static uint8_t *help_osd[2] = { NULL, NULL };
  99 static uint8_t *info_osd = NULL;
 100 static int help_view = 1;
 101 static int help_views = 1;
 102 static int32_t osd_timer = 0;
 103 #ifdef HAVE_OVR
 104 #define SCREEN_WIDTH    1344
 105 #define SCREEN_HEIGHT   800
 106 #else
 107 #define SCREEN_WIDTH    (320*3)
 108 #define SCREEN_HEIGHT   (200*3)
 109 #endif
 110 #define IMAGE_WIDTH     320
 111 #define IMAGE_HEIGHT    200
 112 #define BENSON_AT_LINE  136
 113 #define IMAGE_DIWSTART  0x2c
 114 #define HELP_ALPHA      0xd0
 115 #define OSD_WIDTH       320
 116 #define OSD_HEIGHT      16
 117 static uint16_t *chipreg = NULL;
 118 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 119 static int sound_buffer_size; /* buffer sample size */
 120 static int sound_buffer_writep; /* write pointer at buffer */
 121 static int sound_buffer_readp; /* read pointer at buffer */
 122 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 123 static double benson_size; /* render size of benson */
 124 static int render_legacy = 0; /* render original amiga screen, if set */
 125 static int render_improved = 0; /* render improved image, if set */
 126 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 127 static int intro_skipped = 0; /* indicated if we already have landed */
 128 static int window_width, window_height;
 129
 130 static const char *home_dir;
 131
 132 static int quit = 0;
 133
 134 int parse_args(int argc, char *argv[])
 135 {
 136         int i = 1;
 137
 138         while (argc > i) {
 139                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 140                         print_info("Usage: %s\n", argv[0]);
 141                         print_info(" -s --render-speed original | fast\n");
 142                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 143                         print_info("    --fps <fps>\n");
 144                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 145                         print_info(" -v --video-filter on | off\n");
 146                         print_info("        Set video filter.\n");
 147                         print_info(" -a --audio-filter on | off\n");
 148                         print_info("        Set audio filter.\n");
 149                         print_info(" -r --render original | opengl\n");
 150                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 151                         print_info(" -b --benson normal | half\n");
 152                         print_info("        Size of 'Benson' (control panel).\n");
 153                         print_info(" -m --multisampling <samples>\n");
 154                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 155                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 156                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 157                         print_info(" -i --skip-intro\n");
 158                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 159                         print_info("Debug options:\n");
 160                         print_info(" -o --debug-opengl\n");
 161                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 162                         print_info("    --debug-transparent\n");
 163                         print_info("        Draw all things half transparent.\n");
 164                         print_info("    --ctrl-c\n");
 165                         print_info("        Use CTRL+C to exit game (used for development)\n");
 166                         return -1;
 167                 } else
 168                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 169                         i++;
 170                         if (argc == i) {
 171 missing_parameter:
 172                                 print_info("Missing parameter, use '--help'!\n");
 173                                 return -1;
 174                         }
 175                         if (!strcmp(argv[i], "original"))
 176                                 config_amiga_speed = 1;
 177                         else
 178                         if (!strcmp(argv[i], "fast"))
 179                                 config_amiga_speed = 0;
 180                         else {
 181 illegal_parameter:
 182                                 print_info("Illegal parameter, use '--help'!\n");
 183                                 return -1;
 184                         }
 185                 } else
 186                 if (!strcmp(argv[i], "--fps")) {
 187                         i++;
 188                         if (argc == i)
 189                                 goto missing_parameter;
 190                         config_fps = atof(argv[i]);
 191                         if (config_fov <= 0.0)
 192                                 goto illegal_parameter;
 193                 } else
 194                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 195                         i++;
 196                         if (argc == i)
 197                                 goto missing_parameter;
 198                         if (!strcmp(argv[i], "on"))
 199                                 config_video_filter = 1;
 200                         else
 201                         if (!strcmp(argv[i], "off"))
 202                                 config_video_filter = 0;
 203                         else
 204                                 goto illegal_parameter;
 205                 } else
 206                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 207                         i++;
 208                         if (argc == i)
 209                                 goto missing_parameter;
 210                         if (!strcmp(argv[i], "on"))
 211                                 config_audio_filter = 1;
 212                         else
 213                         if (!strcmp(argv[i], "off"))
 214                                 config_audio_filter = 0;
 215                         else
 216                                 goto illegal_parameter;
 217                 } else
 218                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 219                         i++;
 220                         if (argc == i)
 221                                 goto missing_parameter;
 222                         if (!strcmp(argv[i], "original"))
 223                                 config_render = 0;
 224                         else
 225                         if (!strcmp(argv[i], "opengl"))
 226                                 config_render = 1;
 227                         else
 228                                 goto illegal_parameter;
 229                 } else
 230                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 231                         i++;
 232                         if (argc == i)
 233                                 goto missing_parameter;
 234                         if (!strcmp(argv[i], "normal"))
 235                                 config_benson_size = 1.0;
 236                         else
 237                         if (!strcmp(argv[i], "half")) {
 238                                 config_benson_size = 0.5;
 239                                 if (config_fov == FOV_NOVAGEN)
 240                                         config_fov = FOV_JOLLY;
 241                         } else
 242                                 goto illegal_parameter;
 243                 } else
 244                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 245                         i++;
 246                         if (argc == i)
 247                                 goto missing_parameter;
 248                         config_multisampling = atoi(argv[i]);
 249                 } else
 250                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 251                         i++;
 252                         if (argc == i)
 253                                 goto missing_parameter;
 254                         config_fov = atof(argv[i]);
 255                         if (config_fov < 1.0 || config_fov > 179.0)
 256                                 goto illegal_parameter;
 257                 } else
 258                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 259                         config_skip_intro = 1;
 260                 } else
 261                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 262                         config_debug_opengl = 1;
 263                 } else
 264                 if (!strcmp(argv[i], "--debug-transparent")) {
 265                         config_debug_transparent = 1;
 266                 } else
 267                 if (!strcmp(argv[i], "--ctrl-c")) {
 268                         config_ctrl_c = 1;
 269                 } else {
 270                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 271                         return -1;
 272                 }
 273                 i++;
 274         }
 275
 276         return 0;
 277 }
 278
 279 static void osd_info(const char *param, const char *value)
 280 {
 281         char line[41] = "                                        ";
 282
 283         if (param[0]) {
 284                 strncpy(line + 21 - strlen(param), param, strlen(param));
 285                 line[22] = ':';
 286         }
 287         if (strlen(value) > 15) {
 288                 print_error("string too long\n");
 289                 return;
 290         }
 291         strncpy(line + 25, value, strlen(value));
 292         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 293         osd_timer = ticks_sdl() + 2500;
 294 }
 295
 296 static void resize_window(int width, int height)
 297 {
 298         window_width = width;
 299         window_height = height;
 300 }
 301
 302 #ifdef HAVE_OVR
 303 static int __attribute__((unused)) button_a_last = 0, button_b_last = 0, button_x_last = 0, button_y_last = 0, button_menu_last = 0, button_trigger_last = 0, button_left_thumb_last = 0, button_right_thumb_last = 0;
 304 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;
 305 static int thrust_last = KEYCODE_SPACE;
 306 static int keyboard_on = 0;
 307 static enum keycode vr_key_pressed = 0, vr_key = 0;
 308
 309 static void handle_vr_poses(void)
 310 {
 311         int button_a = 0, button_b = 0, button_x = 0, button_y = 0, button_menu = 0, button_trigger = 0, button_left_thumb = 0, button_right_thumb = 0;
 312         double hand_right_x = 0.0, hand_right_y = 0.0, hand_right_z = 0.0;
 313         double hand_right_yaw = 0.0, hand_right_pitch = 0.0, hand_right_roll = 0.0;
 314         double stick_left_x = 0.0, stick_left_y = 0.0, stick_right_x = 0.0, stick_right_y = 0.0;
 315         int thrust = KEYCODE_SPACE;
 316
 317         get_poses_ovr(&button_a, &button_b, &button_x, &button_y, &button_menu, &button_trigger, &button_left_thumb, &button_right_thumb, &hand_right_x, &hand_right_y, &hand_right_z, &hand_right_yaw, &hand_right_pitch, &hand_right_roll, &stick_left_x, &stick_left_y, &stick_right_x, &stick_right_y);
 318         if (button_menu && !button_menu_last) {
 319                 /* menu toggle */
 320                 if (help_view == help_views)
 321                         help_view = 0;
 322                 else
 323                         help_view++;
 324         }
 325         if (help_view) {
 326                 if (button_trigger && !button_trigger_last) {
 327                         /* rigger pressed */
 328                         normalize_observer_ovr();
 329                         osd_info("", "change height");
 330                 }
 331         } else {
 332                 /* handle input */
 333                 if (button_a && !button_a_last) {
 334                         /* keyboard A toggle */
 335                         if (keyboard_on == 1)
 336                                 keyboard_on = 0;
 337                         else
 338                                 keyboard_on = 1;
 339                 }
 340                 if (button_b && !button_b_last) {
 341                         /* keyboard B toggle */
 342                         if (keyboard_on == 2)
 343                                 keyboard_on = 0;
 344                         else
 345                                 keyboard_on = 2;
 346                 }
 347                 if (button_x && !button_x_last) {
 348                         /* 'board' pressed */
 349                         set_amiga_key(KEYCODE_b, 1);
 350                         set_amiga_key(KEYCODE_b, 0);
 351                 }
 352                 if (button_y && !button_y_last) {
 353                         /* 'leave' pressed */
 354                         set_amiga_key(KEYCODE_l, 1);
 355                         set_amiga_key(KEYCODE_l, 0);
 356                 }
 357                 if (button_left_thumb && !button_left_thumb_last) {
 358                         /* 'escape' pressed */
 359                         set_amiga_key(KEYCODE_ESCAPE, 1);
 360                         set_amiga_key(KEYCODE_ESCAPE, 0);
 361                 }
 362                 if (!button_left_thumb && button_left_thumb_last) {
 363                         /* 'escape' released */
 364                         set_amiga_key(KEYCODE_SPACE, 1);
 365                         set_amiga_key(KEYCODE_SPACE, 0);
 366                 }
 367                 if (button_right_thumb && !button_right_thumb_last) {
 368                         /* 'running' pressed */
 369                         set_amiga_key(KEYCODE_r, 1);
 370                         set_amiga_key(KEYCODE_r, 0);
 371                 }
 372                 if (button_trigger && !button_trigger_last) {
 373                         /* trigger pressed */
 374                         if (!keyboard_on) {
 375                                 set_joystick(-1, -1, -1, -1, 1);
 376                         } else if (vr_key) {
 377                                 vr_key_pressed = vr_key;
 378                                 set_amiga_key(vr_key_pressed, 1);
 379                         }
 380                 }
 381                 if (!button_trigger && button_trigger_last) {
 382                         /* trigger released */
 383                         set_joystick(-1, -1, -1, -1, 0);
 384                         if (vr_key_pressed) {
 385                                 set_amiga_key(vr_key_pressed, 0);
 386                                 vr_key_pressed = 0;
 387                         }
 388                 }
 389                 /* joystick */
 390                 if (stick_right_x > 0.5)
 391                         set_joystick(0, 1, -1, -1, -1);
 392                 else
 393                 if (stick_right_x < -0.5)
 394                         set_joystick(1, 0, -1, -1, -1);
 395                 else
 396                 if (stick_right_x_last > 0.5 || stick_right_x_last < -0.5)
 397                         set_joystick(0, 0, -1, -1, -1);
 398                 if (stick_right_y > 0.5)
 399                         set_joystick(-1, -1, 1, 0, -1);
 400                 else
 401                 if (stick_right_y < -0.5)
 402                         set_joystick(-1, -1, 0, 1, -1);
 403                 else
 404                 if (stick_right_y_last > 0.5 || stick_right_y_last < -0.5)
 405                         set_joystick(-1, -1, 0, 0, -1);
 406                 /* thrust */
 407                 if (stick_left_y > 0.3)
 408                         thrust = (stick_left_y - 0.3) / 0.6 * 11.0;
 409                 else
 410                 if (stick_left_y < -0.3)
 411                         thrust = (stick_left_y + 0.3) / 0.6 * 11.0;
 412                 else
 413                         thrust = 0;
 414                 if (thrust >= 10)
 415                         thrust = KEYCODE_0;
 416                 else
 417                 if (thrust > 0)
 418                         thrust = KEYCODE_1 + thrust - 1;
 419                 else
 420                 if (thrust < 0)
 421                         thrust = KEYCODE_F1 - thrust - 1;
 422                 else
 423                 if (thrust <= -10)
 424                         thrust = KEYCODE_F10;
 425                 else
 426                         thrust = KEYCODE_SPACE;
 427                 if (thrust_last != thrust) {
 428                         set_amiga_key(thrust, 1);
 429                         set_amiga_key(thrust, 0);
 430                 }
 431         }
 432         button_a_last = button_a;
 433         button_b_last = button_b;
 434         button_x_last = button_x;
 435         button_y_last = button_y;
 436         button_menu_last = button_menu;
 437         button_trigger_last = button_trigger;
 438         button_left_thumb_last = button_left_thumb;
 439         button_right_thumb_last = button_right_thumb;
 440         stick_left_x_last = stick_left_x;
 441         stick_left_y_last = stick_left_y;
 442         stick_right_x_last = stick_right_x;
 443         stick_right_y_last = stick_right_y;
 444         thrust_last = thrust;
 445
 446         /* we must handle keyboard after toggeling keyboard_on,
 447          * so that keyboard_on will not change until keyboard is rendered */
 448         vr_key = 0;
 449         if (keyboard_on)
 450                 handle_vr_keyboard(keyboard_on - 1, hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 451 }
 452 #endif
 453
 454 static void skip_intro(void)
 455 {
 456         int event;
 457         double render_delay = 0.0;
 458         double cycle_count;
 459
 460         if (intro_skipped)
 461                 return;
 462
 463         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 464         do {
 465                 /* render, if not delayed */
 466                 if (render_delay <= 0.0) {
 467                         cycle_count = 0;
 468                         do {
 469                                 cycle_count += execute_cpu(0, &event);
 470                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 471                         render_delay += (double)cycle_count / CPU_SPEED;
 472                 }
 473                 /* VBL */
 474                 execute_cpu(3, NULL);
 475                 /* count down render delay */
 476                 if (render_delay) {
 477                         render_delay -= 1.0 / (double)IRQ_RATE;
 478                         if (render_delay < 0.0)
 479                                 render_delay = 0.0;
 480                 }
 481         } while (event != STOP_AT_CLEAR_SCREEN1);
 482
 483         intro_skipped = 1;
 484 }
 485
 486 static void special_event(int event)
 487 {
 488         if (render_improved)
 489                 render_capture_event(event);
 490 }
 491
 492 static void main_loop(void)
 493 {
 494         double frame_step, frame_time = 0.0, frame_render = 1;
 495         int had_first_irq = 0;
 496         static uint32_t current_time, last_time = 0, diff;
 497         int i, rc;
 498         int space, length;
 499         int cycle_count, event = STOP_AT_END;
 500         double render_delay = 0.0;
 501         uint32_t palette_address;
 502         uint16_t palette[16];
 503 #ifdef HAVE_OVR
 504         int eye;
 505 #endif
 506
 507         last_time = ticks_sdl();
 508
 509         /* render result on window */
 510         while (!quit) {
 511                 /* if we are in interstellar fligt, we use 50 Hz */
 512                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 513                 /* else we use whatever frame rate the user wants */
 514                 if (render_capture_is_interstellar())
 515                         frame_step = vbl_duration * 50.0;
 516                 else if (!intro_skipped)
 517                         frame_step = vbl_duration * 10.0;
 518                 else
 519                         frame_step = vbl_duration * config_fps;
 520                 if (frame_step > 1.0)
 521                         frame_step = 1.0;
 522                 /* handle SDL events */
 523                 rc = event_sdl();
 524                 if (rc)
 525                         break;
 526
 527                 /* initialize rendering */
 528                 debug_opengl = config_debug_opengl;
 529                 benson_size = config_benson_size;
 530                 render_legacy = (!config_render) || debug_opengl;
 531                 render_improved = config_render || debug_opengl;
 532                 if (!render_improved) {
 533                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 534                         render_capture_reset();
 535                 }
 536                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 537                 /* amgia speed: don't render if we still delay */
 538                 /* non amiga speed: render if we need a new frame */
 539                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 540                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 541                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 542                 if (((frame_render && !config_amiga_speed)
 543                   || (config_amiga_speed && render_delay <= 0.0)
 544                   || event == STOP_AT_WAIT_INPUT)
 545                 && !(had_first_irq && help_view)) {
 546                         frame_render = 0;
 547                         /* start capturing for improved graphics */
 548                         if (render_improved)
 549                                 render_capture_start(config_fov, config_improve_extend_roads, config_improve_smooth_planets, config_debug_transparent);
 550
 551                         /* execute until the rendered image is ready (wait for VBL) */
 552                         cycle_count = 0;
 553                         do {
 554                                 cycle_count += execute_cpu(0, &event);
 555                                 /* handle special events */
 556                                 special_event(event);
 557                                 if (event == STOP_AT_CLEAR_SCREEN1)
 558                                         intro_skipped = 1;
 559                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 560                         /* stop capturing for improved graphics */
 561                         if (render_improved)
 562                                 render_capture_stop();
 563                         /* copy palette */
 564                         palette_address = mercenary_palette_view();
 565                         for (i = 0; i < 16; i++)
 566                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 567                         /* for amiga speed: set delay by the number of cycles */
 568                         if (config_amiga_speed)
 569                                 render_delay += (double)cycle_count / CPU_SPEED;
 570                 }
 571
 572                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 573 #ifdef HAVE_OVR
 574                 handle_vr_poses();
 575
 576                 begin_render_ovr();
 577
 578                 for (eye = 0; eye < 2; eye++) {
 579                         double camera_x, camera_y, camera_z;
 580                         /* begin of rendering eye, viewport and frustum is set here */
 581                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 582 #else
 583                 {
 584 #endif
 585                         /* clear screen */
 586 #ifdef HAVE_OVR
 587                         opengl_clear(1);
 588 #else
 589                         opengl_clear(0);
 590 #endif
 591                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 592                         if (render_improved) {
 593 #ifndef HAVE_OVR
 594                                 /* viewport and frustum is set here */
 595                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 596 #endif
 597                                 /* render improved graphics, interpolate, if required,
 598                                  * if no item list is available, for legacy rendering
 599                                  */
 600 #ifdef HAVE_OVR
 601                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 1);
 602 #else
 603                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 0);
 604 #endif
 605                                 if (rc)
 606                                         goto goto_legacy;
 607 #ifdef HAVE_OVR
 608                                 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);
 609 #else
 610                                 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);
 611 #endif
 612                                 if (help_view)
 613                                         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);
 614                                 if (osd_timer) {
 615                                         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);
 616                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 617                                                 osd_timer = 0;
 618                                 }
 619                         }
 620                         /* setup viewport for legacy image and render image, if enabled */
 621                         /* also render legacy, if render_improved failed due to not (yet) available items */
 622                         if (render_legacy) {
 623                                 goto_legacy:
 624                                 /* render game view without benson
 625                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 626                                  */
 627                                 if (had_first_irq)
 628                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 629 #ifndef HAVE_OVR
 630                                 /* viewport and frustum is set here */
 631                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, 1.0);
 632 #endif
 633                                 opengl_blit_image(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, 0, config_fov, config_monitor_distance, 1.0, 0);
 634                                 if (help_view)
 635                                         opengl_blit_osd(0, help_osd[help_view - 1], config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, 1.0, 1.0, 1.0, 0.0, 0.0);
 636                                 if (osd_timer) {
 637                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, 1.0, 0.5, 0.04, 0.5, -0.95);
 638                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 639                                                 osd_timer = 0;
 640                                 }
 641                         }
 642 #ifdef HAVE_OVR
 643                         /* render keyboard */
 644                         if (keyboard_on)
 645                                 render_vr_keyboard(keyboard_on - 1, camera_x, camera_y);
 646
 647                         /* end of rendering eye */
 648                         end_render_ovr_eye(eye);
 649                 }
 650                 /* at this point we are ready with our image, so we display */
 651                 end_render_ovr();
 652                 render_mirror_ovr(window_width, window_height);
 653 #else
 654                 }
 655 #endif
 656                 swap_sdl();
 657
 658                 /* advance frame time, if we are not in help view  */
 659                 if (!(had_first_irq && help_view)) {
 660                         frame_time += frame_step;
 661                         if (frame_time >= 1.0) {
 662                                 frame_time -= 1.0;
 663                                 frame_render = 1;
 664                         }
 665                 }
 666
 667                 /* measure frame rate */
 668                 framerate_measure();
 669
 670                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 671                 /* only do this, if we are not in help view */
 672                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 673                 if (!(had_first_irq && help_view)) {
 674                         current_time = ticks_sdl();
 675                         diff = current_time - last_time;
 676                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 677                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 678                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 679                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 680                         }
 681                         while (diff > 1000 / IRQ_RATE) {
 682                                 /* trigger and execute IRQ 3 = VBL */
 683                                 execute_cpu(3, NULL);
 684                                 had_first_irq = 1;
 685                                 /* transfer benson without game view
 686                                  * because we only got benson refreshed during VBL IRQ
 687                                  */
 688                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 689                                 /* render sound to sound buffer
 690                                  * buffer pointer read and write is atomic, so no locking required!
 691                                  */
 692                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 693                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 694 #ifdef DEBUG_SOUND_BUFFERING
 695                                         fprintf(stderr, "sound buffer overflow\n");
 696 #endif
 697                                         length = space;
 698                                 } else
 699                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 700 #ifdef DEBUG_SOUND_BUFFERING
 701                                 printf("can write %d, write %d\n", space, length);
 702                                 static int cnt = 0;
 703                                 int s;
 704                                 for (s = 0; s < length; s++) {
 705                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 706                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 707                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 708                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 709                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 710                                          cnt++;
 711                                 }
 712 #else
 713                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 714 #endif
 715                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 716                                 diff -= 1000 / IRQ_RATE;
 717                                 last_time += 1000 / IRQ_RATE;
 718
 719                                 /* count down render delay */
 720                                 if (render_delay) {
 721                                         render_delay -= 1.0 / (double)IRQ_RATE;
 722                                         if (render_delay < 0.0)
 723                                                 render_delay = 0.0;
 724                                 }
 725                         }
 726                 }
 727         }
 728 }
 729
 730 static uint16_t io_read(uint32_t address)
 731 {
 732         uint16_t value = 0xffff;
 733
 734         /* joystick and fire button */
 735         if (address == 0xbfe000 || address == 0xdff00c)
 736                 value &= emulate_joystick_read(address);
 737         /* keyboard */
 738         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 739                 value &= emulate_keyboard_read(address);
 740         /* diskette */
 741         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 742                 value &= emulate_disk_read(address);
 743
 744         return value;
 745 }
 746
 747 static void io_write(uint32_t address, uint16_t value)
 748 {
 749         /* dmacon and sound registers */
 750         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 751                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 752         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 753                 emulate_disk_write(address, value);
 754 }
 755
 756 /* two tracks with 0x1820 words of length */
 757 static uint8_t game_save[2][0x1820 << 1];
 758 static int last_track = 0;
 759
 760 /* game reads track with saved game */
 761 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 762 {
 763         if (length > sizeof(game_save[0])) {
 764                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 765                 return;
 766         }
 767
 768         /* if even track is selected, load game */
 769         if (!(track & 1)) {
 770                 char filename[256];
 771                 int gamesave_num = (track - 2) >> 1;
 772                 int got;
 773                 FILE *fp;
 774
 775                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 776 #if defined(_WIN32)
 777                 filename[0] = '\0';
 778 #else
 779                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 780                 mkdir(filename, 0777);
 781 #endif
 782                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 783                 fp = fopen(filename, "r");
 784                 if (!fp) {
 785 fail:
 786                         print_info("failed to load game from '%s'\n", filename);
 787                         goto copy;
 788                 }
 789                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 790                 fclose(fp);
 791                 if (got != 2)
 792                         goto fail;
 793         }
 794
 795 copy:
 796         /* copy track */
 797         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 798 }
 799
 800 /* game writes track with saved game */
 801 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 802 {
 803         /* skip sync info that is provided by game and only relevant for a real disk track */
 804         data += 0x200;
 805         length -= 0x200;
 806
 807         if (length != sizeof(game_save[0])) {
 808                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 809                 return;
 810         }
 811
 812         /* don't save if last track is the same, because disk is written on both sides with the same data */
 813         if (track == last_track) {
 814                 if (memcmp(memory + data, game_save[track & 1], length)) {
 815                         print_error("saving game data on other side of the disk is different, please fix!\n");
 816                 }
 817                 return;
 818         }
 819         last_track = track;
 820
 821         /* save game data */
 822         memcpy(game_save[track & 1], memory + data, length);
 823
 824         /* if done with saving */
 825         if ((track & 1)) {
 826                 char filename[256];
 827                 int gamesave_num = (track - 2) >> 1;
 828                 int wrote;
 829                 FILE *fp;
 830
 831 #if defined(_WIN32)
 832                 filename[0] = '\0';
 833 #else
 834                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 835                 mkdir(filename, 0777);
 836 #endif
 837                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 838                 fp = fopen(filename, "w");
 839                 if (!fp) {
 840 fail:
 841                         print_error("failed to save game to '%s'\n", filename);
 842                         return;
 843                 }
 844                 print_info("Game state saved to '%s'\n", filename);
 845                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 846                 fclose(fp);
 847                 if (wrote != 2)
 848                         goto fail;
 849         }
 850 }
 851
 852 static int shift = 0, ctrl = 0;
 853
 854 static void keyboard_sdl(int down, enum keycode keycode)
 855 {
 856         switch (keycode) {
 857         case KEYCODE_LCTRL:
 858         case KEYCODE_RCTRL:
 859                 ctrl = down;
 860                 break;
 861         default: break;
 862         }
 863
 864         if (ctrl && down) {
 865                 switch (keycode) {
 866                 case KEYCODE_h:
 867                         if (help_view == help_views)
 868                                 help_view = 0;
 869                         else
 870                                 help_view++;
 871                         break;
 872                 case KEYCODE_v:
 873                         config_video_filter ^= 1;
 874                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 875                         break;
 876                 case KEYCODE_a:
 877                         config_audio_filter ^= 1;
 878                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 879                         break;
 880                 case KEYCODE_s:
 881                         config_amiga_speed ^= 1;
 882                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 883                         break;
 884                 case KEYCODE_r:
 885                         config_render ^= 1;
 886                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 887                         break;
 888                 case KEYCODE_b:
 889                         if (!config_render && !config_debug_opengl) {
 890                                 osd_info("", "not applicable");
 891                                 break;
 892                         }
 893                         if (config_benson_size == 0.5) {
 894                                 config_benson_size = 1.0;
 895                                 config_fov = FOV_NOVAGEN;
 896                         } else {
 897                                 config_benson_size = 0.5;
 898                                 config_fov = FOV_JOLLY;
 899                         }
 900                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 901                         break;
 902                 case KEYCODE_i:
 903                         if (!intro_skipped)
 904                                 skip_intro();
 905                         else
 906                                 osd_info("", "not applicable");
 907                         break;
 908                 case KEYCODE_c:
 909                         if (config_ctrl_c)
 910                                 quit = 1;
 911                         break;
 912                 case KEYCODE_o:
 913 #ifdef HAVE_OVR
 914                         normalize_observer_ovr();
 915                         osd_info("", "change height");
 916 #else
 917                         osd_info("", "not applicable");
 918 #endif
 919                         break;
 920                 case KEYCODE_KP_PLUS:
 921                         if (config_fov / 1.2 >= FOV_MIN)
 922                                 config_fov /= 1.2;
 923                         disp_fov:
 924                         {
 925                                 char text[16];
 926                                 sprintf(text, "%.2f", config_fov);
 927                                 osd_info("FOV", text);
 928                         }
 929                         break;
 930                 case KEYCODE_KP_MINUS:
 931                         if (config_fov * 1.2 <= FOV_MAX)
 932                                 config_fov *= 1.2;
 933                         goto disp_fov;
 934                 default: break;
 935                 }
 936                 /* do not pass keys to game while holding CTRL */
 937                 return;
 938         }
 939
 940         if (keycode == KEYCODE_PAUSE && down) {
 941                 if (help_view == help_views)
 942                         help_view = 0;
 943                 else
 944                         help_view++;
 945         }
 946
 947         /* in help view we must not forward keypresses */
 948         if (help_view)
 949                 return;
 950
 951         switch (keycode) {
 952         case KEYCODE_LSHIFT:
 953                 set_amiga_key(keycode, down);
 954                 shift = down;
 955                 break;
 956         case KEYCODE_RSHIFT:
 957                 set_amiga_key(keycode, down);
 958                 shift = down;
 959                 break;
 960         case KEYCODE_LEFT:
 961                 if (shift && down) {
 962                         set_amiga_key(keycode, down);
 963                         set_joystick(-1, -1, -1, -1, -1);
 964                         break;
 965                 }
 966                 set_amiga_key(keycode, 0);
 967                 set_joystick(down, -1, -1, -1, -1);
 968                 break;
 969         case KEYCODE_RIGHT:
 970                 if (shift && down) {
 971                         set_amiga_key(keycode, down);
 972                         set_joystick(-1, -1, -1, -1, -1);
 973                         break;
 974                 }
 975                 set_amiga_key(keycode, 0);
 976                 set_joystick(-1, down, -1, -1, -1);
 977                 break;
 978         case KEYCODE_UP:
 979                 if (shift && down) {
 980                         set_amiga_key(keycode, down);
 981                         set_joystick(-1, -1, -1, -1, -1);
 982                         break;
 983                 }
 984                 set_amiga_key(keycode, 0);
 985                 set_joystick(-1, -1, down, -1, -1);
 986                 break;
 987         case KEYCODE_DOWN:
 988                 if (shift && down) {
 989                         set_amiga_key(keycode, down);
 990                         set_joystick(-1, -1, -1, -1, -1);
 991                         break;
 992                 }
 993                 set_amiga_key(keycode, 0);
 994                 set_joystick(-1, -1, -1, down, -1);
 995                 break;
 996         case KEYCODE_END:
 997                 set_joystick(-1, -1, -1, -1, down);
 998                 break;
 999         case KEYCODE_INSERT:
1000                 set_amiga_key(KEYCODE_HELP, down);
1001                 break;
1002         default:
1003                 set_amiga_key(keycode, down);
1004         }
1005 }
1006
1007 void audio_sdl(float *data, int length)
1008 {
1009         int fill, s;
1010
1011         /* read sound from sound buffer
1012          * buffer pointer read and write is atomic, so no locking required!
1013          */
1014         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1015         if (fill < length) {
1016 #ifdef DEBUG_SOUND_BUFFERING
1017                 fprintf(stderr, "sound buffer underrun\n");
1018 #endif
1019                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1020                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1021         }
1022         for (s = 0; s < length; s++) {
1023                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1024                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1025         }
1026 #ifdef DEBUG_SOUND_BUFFERING
1027         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1028 #endif
1029         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1030 }
1031
1032 void sound_irq(void)
1033 {
1034         /* trigger and execute IRQ 4 = sound */
1035         execute_cpu(4, NULL);
1036 }
1037
1038 int main(int argc, char *argv[])
1039 {
1040         int rc;
1041         int sdl_sound_chunk;
1042
1043         home_dir = getenv("HOME");
1044         if (!home_dir)
1045                 home_dir = "";
1046
1047         rc = parse_args(argc, argv);
1048         if (rc)
1049                 return 0;
1050
1051         /* allocate image */
1052         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1053         if (!image) {
1054                 print_error("Failed to allocate image buffer\n");
1055                 goto done;
1056         }
1057
1058         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1059                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1060                 goto done;
1061         }
1062         if ((1000 % IRQ_RATE)) {
1063                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1064                 goto done;
1065         }
1066
1067         /* calculate SDL chunk size for audio
1068          * it must be a power of two, but not more than the chunk size for each IRQ!
1069          */
1070         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1071                 ;
1072         sdl_sound_chunk >>= 1;
1073 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1074
1075         /* allocate sound buffers */
1076         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1077         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1078         if (!sound_buffer) {
1079                 print_error("Failed to allocate image buffer\n");
1080                 goto done;
1081         }
1082
1083         /* allocate memory */
1084         memory = calloc(MEMORY_SIZE, 1);
1085         if (!memory) {
1086                 print_error("Failed to allocate cpu's memory\n");
1087                 goto done;
1088         }
1089         stop_event = calloc(MEMORY_SIZE, 1);
1090         if (!stop_event) {
1091                 print_error("Failed to allocate cpu's stop_event memory\n");
1092                 goto done;
1093         }
1094         chipreg = calloc(IOSIZE, 1);
1095         if (!chipreg) {
1096                 print_error("Failed to allocate chip register\n");
1097                 goto done;
1098         }
1099
1100         /* init cpu code */
1101         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1102
1103         /* init disk emulation */
1104         disk_init(disk_read, disk_write);
1105
1106         /* load binary */
1107         mercenary_load();
1108
1109         /* patch some stuff */
1110         mercenary_patch();
1111
1112         /* init SDL and OpenGL */
1113 #ifdef HAVE_OVR
1114         int vbl_sync = 0;
1115         int rift = 1;
1116         int multisampling = 0;
1117         window_width = SCREEN_WIDTH;
1118         window_height = SCREEN_HEIGHT;
1119 #else
1120         int vbl_sync = 1;
1121         int rift = 0;
1122         int multisampling = config_multisampling;
1123         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1124         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1125 #endif
1126         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, multisampling, vbl_sync, rift);
1127         if (rc < 0)
1128                 goto done;
1129 #ifdef HAVE_OVR
1130         rc = init_ovr(config_multisampling);
1131         if (rc < 0)
1132                 goto done;
1133         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1134         if (rc < 0)
1135                 goto done;
1136 #endif
1137         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1138         if (rc < 0)
1139                 goto done;
1140
1141         /* init osd */
1142         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1143         if (rc < 0)
1144                 goto done;
1145         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1146         if (rc < 0)
1147                 goto done;
1148         help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1149         if (!help_osd[0])
1150                 goto done;
1151         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);
1152         text_render(help_osd[0], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1153                 "Emulation:\n"
1154                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1155                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1156                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1157                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1158                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1159                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1160                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1161                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1162                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1163 #ifdef HAVE_OVR
1164                 "        Press `CTRL' + `O' (or right trigger) to reset observer position.\n"
1165 #endif
1166                 "\n"
1167                 "Answer to a Question:\n"
1168                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1169                 "\n"
1170                 "Walking / Driving / Flying:\n"
1171                 "        Use cursor keys as joystick, to move player / craft.\n"
1172                 "        Press `R' for running, 'W' for walking speed.\n"
1173                 "        Press `B' to board, `L' to leave.\n"
1174                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1175                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1176                 "        Press `SPACE' to stop craft.\n"
1177                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1178                 "        Press `T' for turbo on certain craft.\n"
1179                 "        Press `END' as joystick's fire button.\n"
1180                 "\n"
1181                 "Elevator:\n"
1182                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1183                 "\n"
1184                 "Inside a transporter:\n"
1185                 "        Press `1'...`0' to select destination.\n"
1186                 "\n"
1187                 "Items:\n"
1188                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1189                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1190                 "        Press `NUMPAD Enter' to select certain items.\n"
1191                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1192                 "        Press `NUMPAD *' to read entry\n"
1193                 "Saving / Loading / Pause:\n"
1194                 "        Press `INSERT' to loading and saving options.\n"
1195                 "        Press `ENTER' to pause game, other key to continue.\n"
1196                 ,HELP_ALPHA, 1, 2, 5, 0);
1197 #ifdef HAVE_OVR
1198         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1199         if (!help_osd[1])
1200                 goto done;
1201         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);
1202         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1203                 "Emulation using Controller:\n"
1204                 "        Press `Enter' button to toggle this help screen on or off.\n"
1205                 "        Press `A' button to emulate keyboard to control game.\n"
1206                 "        Press `B' button to emulate keyboard to enter alphanumeric keys.\n"
1207                 "        Press `A' or `B' button again to dismiss keyboard.\n"
1208                 "        Point right controller to a key on keyboard. The key will highlight.\n"
1209                 "        Press `Trigger' on right controller enter the highlighted key.\n"
1210                 "\n"
1211                 "Walking / Driving / Flying using Controller:\n"
1212                 "        Use thumb stick on right controller, to move player / craft.\n"
1213                 "        Press thumb stick on tright controller to toggle running/walking speed.\n"
1214                 "        Press `X' button to board, `Y' button to leave.\n"
1215                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1216                 "        Press and hold thumb stick on left controller for escape sequence.\n"
1217                 "        Release thumb stick on left controller stop craft.\n"
1218                 "        Press `Trigger' on right controller to fire.\n"
1219                 "\n"
1220                 "For all other game function, use the emulated keyboards!\n"
1221                 ,HELP_ALPHA, 1, 2, 5, 0);
1222         help_views = 2;
1223 #endif
1224         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1225         if (!info_osd)
1226                 goto done;
1227
1228         /* init audio */
1229         sound_init(SOUND_SAMPLERATE, sound_irq);
1230
1231         /* start cpu */
1232         reset_cpu();
1233
1234         if (config_skip_intro)
1235                 skip_intro();
1236
1237         /* run game */
1238         main_loop();
1239
1240 done:
1241         exit_opengl();
1242 #ifdef HAVE_OVR
1243         exit_ovr();
1244 #endif
1245         exit_sdl();
1246
1247         if (chipreg)
1248                 free(chipreg);
1249         if (stop_event)
1250                 free(stop_event);
1251         if (memory)
1252                 free(memory);
1253         if (sound_buffer)
1254                 free(sound_buffer);
1255         if (image)
1256                 free(image);
1257         if (help_osd[0])
1258                 free(help_osd[0]);
1259         if (help_osd[1])
1260                 free(help_osd[1]);
1261         if (info_osd)
1262                 free(info_osd);
1263
1264         return 0;
1265 }
1266