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 = NULL;
  99 static uint8_t *info_osd = NULL;
 100 static int help_view = 1;
 101 static int32_t osd_timer = 0;
 102 #ifdef HAVE_OVR
 103 #define SCREEN_WIDTH    1344
 104 #define SCREEN_HEIGHT   800
 105 #else
 106 #define SCREEN_WIDTH    (320*3)
 107 #define SCREEN_HEIGHT   (200*3)
 108 #endif
 109 #define IMAGE_WIDTH     320
 110 #define IMAGE_HEIGHT    200
 111 #define BENSON_AT_LINE  136
 112 #define IMAGE_DIWSTART  0x2c
 113 #define HELP_ALPHA      0xd0
 114 #define OSD_WIDTH       320
 115 #define OSD_HEIGHT      16
 116 static uint16_t *chipreg = NULL;
 117 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 118 static int sound_buffer_size; /* buffer sample size */
 119 static int sound_buffer_writep; /* write pointer at buffer */
 120 static int sound_buffer_readp; /* read pointer at buffer */
 121 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 122 static double benson_size; /* render size of benson */
 123 static int render_legacy = 0; /* render original amiga screen, if set */
 124 static int render_improved = 0; /* render improved image, if set */
 125 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 126 static int intro_skipped = 0; /* indicated if we already have landed */
 127 static int window_width, window_height;
 128
 129 static const char *home_dir;
 130
 131 static int quit = 0;
 132
 133 int parse_args(int argc, char *argv[])
 134 {
 135         int i = 1;
 136
 137         while (argc > i) {
 138                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 139                         print_info("Usage: %s\n", argv[0]);
 140                         print_info(" -s --render-speed original | fast\n");
 141                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 142                         print_info("    --fps <fps>\n");
 143                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 144                         print_info(" -v --video-filter on | off\n");
 145                         print_info("        Set video filter.\n");
 146                         print_info(" -a --audio-filter on | off\n");
 147                         print_info("        Set audio filter.\n");
 148                         print_info(" -r --render original | opengl\n");
 149                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 150                         print_info(" -b --benson normal | half\n");
 151                         print_info("        Size of 'Benson' (control panel).\n");
 152                         print_info(" -m --multisampling <samples>\n");
 153                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 154                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 155                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 156                         print_info(" -i --skip-intro\n");
 157                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 158                         print_info("Debug options:\n");
 159                         print_info(" -o --debug-opengl\n");
 160                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 161                         print_info("    --debug-transparent\n");
 162                         print_info("        Draw all things half transparent.\n");
 163                         print_info("    --ctrl-c\n");
 164                         print_info("        Use CTRL+C to exit game (used for development)\n");
 165                         return -1;
 166                 } else
 167                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 168                         i++;
 169                         if (argc == i) {
 170 missing_parameter:
 171                                 print_info("Missing parameter, use '--help'!\n");
 172                                 return -1;
 173                         }
 174                         if (!strcmp(argv[i], "original"))
 175                                 config_amiga_speed = 1;
 176                         else
 177                         if (!strcmp(argv[i], "fast"))
 178                                 config_amiga_speed = 0;
 179                         else {
 180 illegal_parameter:
 181                                 print_info("Illegal parameter, use '--help'!\n");
 182                                 return -1;
 183                         }
 184                 } else
 185                 if (!strcmp(argv[i], "--fps")) {
 186                         i++;
 187                         if (argc == i)
 188                                 goto missing_parameter;
 189                         config_fps = atof(argv[i]);
 190                         if (config_fov <= 0.0)
 191                                 goto illegal_parameter;
 192                 } else
 193                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 194                         i++;
 195                         if (argc == i)
 196                                 goto missing_parameter;
 197                         if (!strcmp(argv[i], "on"))
 198                                 config_video_filter = 1;
 199                         else
 200                         if (!strcmp(argv[i], "off"))
 201                                 config_video_filter = 0;
 202                         else
 203                                 goto illegal_parameter;
 204                 } else
 205                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 206                         i++;
 207                         if (argc == i)
 208                                 goto missing_parameter;
 209                         if (!strcmp(argv[i], "on"))
 210                                 config_audio_filter = 1;
 211                         else
 212                         if (!strcmp(argv[i], "off"))
 213                                 config_audio_filter = 0;
 214                         else
 215                                 goto illegal_parameter;
 216                 } else
 217                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 218                         i++;
 219                         if (argc == i)
 220                                 goto missing_parameter;
 221                         if (!strcmp(argv[i], "original"))
 222                                 config_render = 0;
 223                         else
 224                         if (!strcmp(argv[i], "opengl"))
 225                                 config_render = 1;
 226                         else
 227                                 goto illegal_parameter;
 228                 } else
 229                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 230                         i++;
 231                         if (argc == i)
 232                                 goto missing_parameter;
 233                         if (!strcmp(argv[i], "normal"))
 234                                 config_benson_size = 1.0;
 235                         else
 236                         if (!strcmp(argv[i], "half")) {
 237                                 config_benson_size = 0.5;
 238                                 if (config_fov == FOV_NOVAGEN)
 239                                         config_fov = FOV_JOLLY;
 240                         } else
 241                                 goto illegal_parameter;
 242                 } else
 243                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 244                         i++;
 245                         if (argc == i)
 246                                 goto missing_parameter;
 247                         config_multisampling = atoi(argv[i]);
 248                 } else
 249                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 250                         i++;
 251                         if (argc == i)
 252                                 goto missing_parameter;
 253                         config_fov = atof(argv[i]);
 254                         if (config_fov < 1.0 || config_fov > 179.0)
 255                                 goto illegal_parameter;
 256                 } else
 257                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 258                         config_skip_intro = 1;
 259                 } else
 260                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 261                         config_debug_opengl = 1;
 262                 } else
 263                 if (!strcmp(argv[i], "--debug-transparent")) {
 264                         config_debug_transparent = 1;
 265                 } else
 266                 if (!strcmp(argv[i], "--ctrl-c")) {
 267                         config_ctrl_c = 1;
 268                 } else {
 269                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 270                         return -1;
 271                 }
 272                 i++;
 273         }
 274
 275         return 0;
 276 }
 277
 278 static void osd_info(const char *param, const char *value)
 279 {
 280         char line[41] = "                                        ";
 281
 282         if (param[0]) {
 283                 strncpy(line + 21 - strlen(param), param, strlen(param));
 284                 line[22] = ':';
 285         }
 286         if (strlen(value) > 15) {
 287                 print_error("string too long\n");
 288                 return;
 289         }
 290         strncpy(line + 25, value, strlen(value));
 291         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 292         osd_timer = ticks_sdl() + 2500;
 293 }
 294
 295 static void resize_window(int width, int height)
 296 {
 297         window_width = width;
 298         window_height = height;
 299 }
 300
 301 #ifdef HAVE_OVR
 302 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;
 303 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;
 304 static int thrust_last = KEYCODE_SPACE;
 305 static int keyboard_on = 0;
 306 static enum keycode vr_key_pressed = 0, vr_key = 0;
 307
 308 static void handle_vr_poses(void)
 309 {
 310         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;
 311         double hand_right_x = 0.0, hand_right_y = 0.0, hand_right_z = 0.0;
 312         double hand_right_yaw = 0.0, hand_right_pitch = 0.0, hand_right_roll = 0.0;
 313         double stick_left_x = 0.0, stick_left_y = 0.0, stick_right_x = 0.0, stick_right_y = 0.0;
 314         int thrust = KEYCODE_SPACE;
 315
 316         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);
 317         if (button_menu && !button_menu_last) {
 318                 /* menu toggle */
 319                 help_view ^= 1;
 320         }
 321         if (help_view) {
 322                 if (button_trigger && !button_trigger_last) {
 323                         /* rigger pressed */
 324                         normalize_observer_ovr();
 325                         osd_info("", "change height");
 326                 }
 327         } else {
 328                 /* handle input */
 329                 if (button_a && !button_a_last) {
 330                         /* keyboard A toggle */
 331                         if (keyboard_on == 1)
 332                                 keyboard_on = 0;
 333                         else
 334                                 keyboard_on = 1;
 335                 }
 336                 if (button_b && !button_b_last) {
 337                         /* keyboard B toggle */
 338                         if (keyboard_on == 2)
 339                                 keyboard_on = 0;
 340                         else
 341                                 keyboard_on = 2;
 342                 }
 343                 if (button_x && !button_x_last) {
 344                         /* 'board' pressed */
 345                         set_amiga_key(KEYCODE_b, 1);
 346                         set_amiga_key(KEYCODE_b, 0);
 347                 }
 348                 if (button_y && !button_y_last) {
 349                         /* 'leave' pressed */
 350                         set_amiga_key(KEYCODE_l, 1);
 351                         set_amiga_key(KEYCODE_l, 0);
 352                 }
 353                 if (button_left_thumb && !button_left_thumb_last) {
 354                         /* 'escape' pressed */
 355                         set_amiga_key(KEYCODE_ESCAPE, 1);
 356                         set_amiga_key(KEYCODE_ESCAPE, 0);
 357                 }
 358                 if (!button_left_thumb && button_left_thumb_last) {
 359                         /* 'escape' released */
 360                         set_amiga_key(KEYCODE_SPACE, 1);
 361                         set_amiga_key(KEYCODE_SPACE, 0);
 362                 }
 363                 if (button_right_thumb && !button_right_thumb_last) {
 364                         /* 'running' pressed */
 365                         set_amiga_key(KEYCODE_r, 1);
 366                         set_amiga_key(KEYCODE_r, 0);
 367                 }
 368                 if (button_trigger && !button_trigger_last) {
 369                         /* trigger pressed */
 370                         if (!keyboard_on) {
 371                                 set_joystick(-1, -1, -1, -1, 1);
 372                         } else if (vr_key) {
 373                                 vr_key_pressed = vr_key;
 374                                 set_amiga_key(vr_key_pressed, 1);
 375                         }
 376                 }
 377                 if (!button_trigger && button_trigger_last) {
 378                         /* trigger released */
 379                         set_joystick(-1, -1, -1, -1, 0);
 380                         if (vr_key_pressed) {
 381                                 set_amiga_key(vr_key_pressed, 0);
 382                                 vr_key_pressed = 0;
 383                         }
 384                 }
 385                 /* joystick */
 386                 if (stick_right_x > 0.5)
 387                         set_joystick(0, 1, -1, -1, -1);
 388                 else
 389                 if (stick_right_x < -0.5)
 390                         set_joystick(1, 0, -1, -1, -1);
 391                 else
 392                 if (stick_right_x_last > 0.5 || stick_right_x_last < -0.5)
 393                         set_joystick(0, 0, -1, -1, -1);
 394                 if (stick_right_y > 0.5)
 395                         set_joystick(-1, -1, 1, 0, -1);
 396                 else
 397                 if (stick_right_y < -0.5)
 398                         set_joystick(-1, -1, 0, 1, -1);
 399                 else
 400                 if (stick_right_y_last > 0.5 || stick_right_y_last < -0.5)
 401                         set_joystick(-1, -1, 0, 0, -1);
 402                 /* thrust */
 403                 if (stick_left_y > 0.3)
 404                         thrust = (stick_left_y - 0.3) / 0.6 * 11.0;
 405                 else
 406                 if (stick_left_y < -0.3)
 407                         thrust = (stick_left_y + 0.3) / 0.6 * 11.0;
 408                 else
 409                         thrust = 0;
 410                 if (thrust >= 10)
 411                         thrust = KEYCODE_0;
 412                 else
 413                 if (thrust > 0)
 414                         thrust = KEYCODE_1 + thrust - 1;
 415                 else
 416                 if (thrust < 0)
 417                         thrust = KEYCODE_F1 - thrust - 1;
 418                 else
 419                 if (thrust <= -10)
 420                         thrust = KEYCODE_F10;
 421                 else
 422                         thrust = KEYCODE_SPACE;
 423                 if (thrust_last != thrust) {
 424                         set_amiga_key(thrust, 1);
 425                         set_amiga_key(thrust, 0);
 426                 }
 427         }
 428         button_a_last = button_a;
 429         button_b_last = button_b;
 430         button_x_last = button_x;
 431         button_y_last = button_y;
 432         button_menu_last = button_menu;
 433         button_trigger_last = button_trigger;
 434         button_left_thumb_last = button_left_thumb;
 435         button_right_thumb_last = button_right_thumb;
 436         stick_left_x_last = stick_left_x;
 437         stick_left_y_last = stick_left_y;
 438         stick_right_x_last = stick_right_x;
 439         stick_right_y_last = stick_right_y;
 440         thrust_last = thrust;
 441
 442         /* we must handle keyboard after toggeling keyboard_on,
 443          * so that keyboard_on will not change until keyboard is rendered */
 444         vr_key = 0;
 445         if (keyboard_on)
 446                 handle_vr_keyboard(keyboard_on - 1, hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 447 }
 448 #endif
 449
 450 static void skip_intro(void)
 451 {
 452         int event;
 453         double render_delay = 0.0;
 454         double cycle_count;
 455
 456         if (intro_skipped)
 457                 return;
 458
 459         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 460         do {
 461                 /* render, if not delayed */
 462                 if (render_delay <= 0.0) {
 463                         cycle_count = 0;
 464                         do {
 465                                 cycle_count += execute_cpu(0, &event);
 466                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 467                         render_delay += (double)cycle_count / CPU_SPEED;
 468                 }
 469                 /* VBL */
 470                 execute_cpu(3, NULL);
 471                 /* count down render delay */
 472                 if (render_delay) {
 473                         render_delay -= 1.0 / (double)IRQ_RATE;
 474                         if (render_delay < 0.0)
 475                                 render_delay = 0.0;
 476                 }
 477         } while (event != STOP_AT_CLEAR_SCREEN1);
 478
 479         intro_skipped = 1;
 480 }
 481
 482 static void special_event(int event)
 483 {
 484         if (render_improved)
 485                 render_capture_event(event);
 486 }
 487
 488 static void main_loop(void)
 489 {
 490         double frame_step, frame_time = 0.0, frame_render = 1;
 491         int had_first_irq = 0;
 492         static uint32_t current_time, last_time = 0, diff;
 493         int i, rc;
 494         int space, length;
 495         int cycle_count, event = STOP_AT_END;
 496         double render_delay = 0.0;
 497         uint32_t palette_address;
 498         uint16_t palette[16];
 499 #ifdef HAVE_OVR
 500         int eye;
 501 #endif
 502
 503         last_time = ticks_sdl();
 504
 505         /* render result on window */
 506         while (!quit) {
 507                 /* if we are in interstellar fligt, we use 50 Hz */
 508                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 509                 /* else we use whatever frame rate the user wants */
 510                 if (render_capture_is_interstellar())
 511                         frame_step = vbl_duration * 50.0;
 512                 else if (!intro_skipped)
 513                         frame_step = vbl_duration * 10.0;
 514                 else
 515                         frame_step = vbl_duration * config_fps;
 516                 if (frame_step > 1.0)
 517                         frame_step = 1.0;
 518                 /* handle SDL events */
 519                 rc = event_sdl();
 520                 if (rc)
 521                         break;
 522
 523                 /* initialize rendering */
 524                 debug_opengl = config_debug_opengl;
 525                 benson_size = config_benson_size;
 526                 render_legacy = (!config_render) || debug_opengl;
 527                 render_improved = config_render || debug_opengl;
 528                 if (!render_improved) {
 529                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 530                         render_capture_reset();
 531                 }
 532                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 533                 /* amgia speed: don't render if we still delay */
 534                 /* non amiga speed: render if we need a new frame */
 535                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 536                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 537                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 538                 if (((frame_render && !config_amiga_speed)
 539                   || (config_amiga_speed && render_delay <= 0.0)
 540                   || event == STOP_AT_WAIT_INPUT)
 541                 && !(had_first_irq && help_view)) {
 542                         frame_render = 0;
 543                         /* start capturing for improved graphics */
 544                         if (render_improved)
 545                                 render_capture_start(config_fov, config_improve_extend_roads, config_improve_smooth_planets, config_debug_transparent);
 546
 547                         /* execute until the rendered image is ready (wait for VBL) */
 548                         cycle_count = 0;
 549                         do {
 550                                 cycle_count += execute_cpu(0, &event);
 551                                 /* handle special events */
 552                                 special_event(event);
 553                                 if (event == STOP_AT_CLEAR_SCREEN1)
 554                                         intro_skipped = 1;
 555                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 556                         /* stop capturing for improved graphics */
 557                         if (render_improved)
 558                                 render_capture_stop();
 559                         /* copy palette */
 560                         palette_address = mercenary_palette_view();
 561                         for (i = 0; i < 16; i++)
 562                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 563                         /* for amiga speed: set delay by the number of cycles */
 564                         if (config_amiga_speed)
 565                                 render_delay += (double)cycle_count / CPU_SPEED;
 566                 }
 567
 568                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 569 #ifdef HAVE_OVR
 570                 handle_vr_poses();
 571
 572                 begin_render_ovr();
 573
 574                 for (eye = 0; eye < 2; eye++) {
 575                         double camera_x, camera_y, camera_z;
 576                         /* begin of rendering eye, viewport and frustum is set here */
 577                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 578 #else
 579                 {
 580 #endif
 581                         /* clear screen */
 582 #ifdef HAVE_OVR
 583                         opengl_clear(1);
 584 #else
 585                         opengl_clear(0);
 586 #endif
 587                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 588                         if (render_improved) {
 589 #ifndef HAVE_OVR
 590                                 /* viewport and frustum is set here */
 591                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 592 #endif
 593                                 /* render improved graphics, interpolate, if required,
 594                                  * if no item list is available, for legacy rendering
 595                                  */
 596 #ifdef HAVE_OVR
 597                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 1);
 598 #else
 599                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 0);
 600 #endif
 601                                 if (rc)
 602                                         goto goto_legacy;
 603 #ifdef HAVE_OVR
 604                                 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);
 605 #else
 606                                 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);
 607 #endif
 608                                 if (help_view)
 609                                         opengl_blit_osd(0, help_osd, 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);
 610                                 if (osd_timer) {
 611                                         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);
 612                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 613                                                 osd_timer = 0;
 614                                 }
 615                         }
 616                         /* setup viewport for legacy image and render image, if enabled */
 617                         /* also render legacy, if render_improved failed due to not (yet) available items */
 618                         if (render_legacy) {
 619                                 goto_legacy:
 620                                 /* render game view without benson
 621                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 622                                  */
 623                                 if (had_first_irq)
 624                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 625 #ifndef HAVE_OVR
 626                                 /* viewport and frustum is set here */
 627                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, 1.0);
 628 #endif
 629                                 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);
 630                                 if (help_view)
 631                                         opengl_blit_osd(0, help_osd, 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);
 632                                 if (osd_timer) {
 633                                         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);
 634                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 635                                                 osd_timer = 0;
 636                                 }
 637                         }
 638 #ifdef HAVE_OVR
 639                         /* render keyboard */
 640                         if (keyboard_on)
 641                                 render_vr_keyboard(keyboard_on - 1, camera_x, camera_y);
 642
 643                         /* end of rendering eye */
 644                         end_render_ovr_eye(eye);
 645                 }
 646                 /* at this point we are ready with our image, so we display */
 647                 end_render_ovr();
 648                 render_mirror_ovr(window_width, window_height);
 649 #else
 650                 }
 651 #endif
 652                 swap_sdl();
 653
 654                 /* advance frame time, if we are not in help view  */
 655                 if (!(had_first_irq && help_view)) {
 656                         frame_time += frame_step;
 657                         if (frame_time >= 1.0) {
 658                                 frame_time -= 1.0;
 659                                 frame_render = 1;
 660                         }
 661                 }
 662
 663                 /* measure frame rate */
 664                 framerate_measure();
 665
 666                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 667                 /* only do this, if we are not in help view */
 668                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 669                 if (!(had_first_irq && help_view)) {
 670                         current_time = ticks_sdl();
 671                         diff = current_time - last_time;
 672                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 673                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 674                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 675                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 676                         }
 677                         while (diff > 1000 / IRQ_RATE) {
 678                                 /* trigger and execute IRQ 3 = VBL */
 679                                 execute_cpu(3, NULL);
 680                                 had_first_irq = 1;
 681                                 /* transfer benson without game view
 682                                  * because we only got benson refreshed during VBL IRQ
 683                                  */
 684                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 685                                 /* render sound to sound buffer
 686                                  * buffer pointer read and write is atomic, so no locking required!
 687                                  */
 688                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 689                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 690 #ifdef DEBUG_SOUND_BUFFERING
 691                                         fprintf(stderr, "sound buffer overflow\n");
 692 #endif
 693                                         length = space;
 694                                 } else
 695                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 696 #ifdef DEBUG_SOUND_BUFFERING
 697                                 printf("can write %d, write %d\n", space, length);
 698                                 static int cnt = 0;
 699                                 int s;
 700                                 for (s = 0; s < length; s++) {
 701                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 702                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 703                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 704                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 705                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 706                                          cnt++;
 707                                 }
 708 #else
 709                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 710 #endif
 711                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 712                                 diff -= 1000 / IRQ_RATE;
 713                                 last_time += 1000 / IRQ_RATE;
 714
 715                                 /* count down render delay */
 716                                 if (render_delay) {
 717                                         render_delay -= 1.0 / (double)IRQ_RATE;
 718                                         if (render_delay < 0.0)
 719                                                 render_delay = 0.0;
 720                                 }
 721                         }
 722                 }
 723         }
 724 }
 725
 726 static uint16_t io_read(uint32_t address)
 727 {
 728         uint16_t value = 0xffff;
 729
 730         /* joystick and fire button */
 731         if (address == 0xbfe000 || address == 0xdff00c)
 732                 value &= emulate_joystick_read(address);
 733         /* keyboard */
 734         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 735                 value &= emulate_keyboard_read(address);
 736         /* diskette */
 737         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 738                 value &= emulate_disk_read(address);
 739
 740         return value;
 741 }
 742
 743 static void io_write(uint32_t address, uint16_t value)
 744 {
 745         /* dmacon and sound registers */
 746         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 747                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 748         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 749                 emulate_disk_write(address, value);
 750 }
 751
 752 /* two tracks with 0x1820 words of length */
 753 static uint8_t game_save[2][0x1820 << 1];
 754 static int last_track = 0;
 755
 756 /* game reads track with saved game */
 757 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 758 {
 759         if (length > sizeof(game_save[0])) {
 760                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 761                 return;
 762         }
 763
 764         /* if even track is selected, load game */
 765         if (!(track & 1)) {
 766                 char filename[256];
 767                 int gamesave_num = (track - 2) >> 1;
 768                 int got;
 769                 FILE *fp;
 770
 771                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 772 #if defined(_WIN32)
 773                 filename[0] = '\0';
 774 #else
 775                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 776                 mkdir(filename, 0777);
 777 #endif
 778                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 779                 fp = fopen(filename, "r");
 780                 if (!fp) {
 781 fail:
 782                         print_info("failed to load game from '%s'\n", filename);
 783                         goto copy;
 784                 }
 785                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 786                 fclose(fp);
 787                 if (got != 2)
 788                         goto fail;
 789         }
 790
 791 copy:
 792         /* copy track */
 793         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 794 }
 795
 796 /* game writes track with saved game */
 797 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 798 {
 799         /* skip sync info that is provided by game and only relevant for a real disk track */
 800         data += 0x200;
 801         length -= 0x200;
 802
 803         if (length != sizeof(game_save[0])) {
 804                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 805                 return;
 806         }
 807
 808         /* don't save if last track is the same, because disk is written on both sides with the same data */
 809         if (track == last_track) {
 810                 if (memcmp(memory + data, game_save[track & 1], length)) {
 811                         print_error("saving game data on other side of the disk is different, please fix!\n");
 812                 }
 813                 return;
 814         }
 815         last_track = track;
 816
 817         /* save game data */
 818         memcpy(game_save[track & 1], memory + data, length);
 819
 820         /* if done with saving */
 821         if ((track & 1)) {
 822                 char filename[256];
 823                 int gamesave_num = (track - 2) >> 1;
 824                 int wrote;
 825                 FILE *fp;
 826
 827 #if defined(_WIN32)
 828                 filename[0] = '\0';
 829 #else
 830                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 831                 mkdir(filename, 0777);
 832 #endif
 833                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 834                 fp = fopen(filename, "w");
 835                 if (!fp) {
 836 fail:
 837                         print_error("failed to save game to '%s'\n", filename);
 838                         return;
 839                 }
 840                 print_info("Game state saved to '%s'\n", filename);
 841                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 842                 fclose(fp);
 843                 if (wrote != 2)
 844                         goto fail;
 845         }
 846 }
 847
 848 static int shift = 0, ctrl = 0;
 849
 850 static void keyboard_sdl(int down, enum keycode keycode)
 851 {
 852         switch (keycode) {
 853         case KEYCODE_LCTRL:
 854         case KEYCODE_RCTRL:
 855                 ctrl = down;
 856                 break;
 857         default: break;
 858         }
 859
 860         if (ctrl && down) {
 861                 switch (keycode) {
 862                 case KEYCODE_h:
 863                         help_view ^= 1;
 864                         break;
 865                 case KEYCODE_v:
 866                         config_video_filter ^= 1;
 867                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 868                         break;
 869                 case KEYCODE_a:
 870                         config_audio_filter ^= 1;
 871                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 872                         break;
 873                 case KEYCODE_s:
 874                         config_amiga_speed ^= 1;
 875                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 876                         break;
 877                 case KEYCODE_r:
 878                         config_render ^= 1;
 879                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 880                         break;
 881                 case KEYCODE_b:
 882                         if (!config_render && !config_debug_opengl) {
 883                                 osd_info("", "not applicable");
 884                                 break;
 885                         }
 886                         if (config_benson_size == 0.5) {
 887                                 config_benson_size = 1.0;
 888                                 config_fov = FOV_NOVAGEN;
 889                         } else {
 890                                 config_benson_size = 0.5;
 891                                 config_fov = FOV_JOLLY;
 892                         }
 893                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 894                         break;
 895                 case KEYCODE_i:
 896                         if (!intro_skipped)
 897                                 skip_intro();
 898                         else
 899                                 osd_info("", "not applicable");
 900                         break;
 901                 case KEYCODE_c:
 902                         if (config_ctrl_c)
 903                                 quit = 1;
 904                         break;
 905                 case KEYCODE_n:
 906 #ifdef HAVE_OVR
 907                         normalize_observer_ovr();
 908                         osd_info("", "change height");
 909 #else
 910                         osd_info("", "not applicable");
 911 #endif
 912                         break;
 913                 case KEYCODE_KP_PLUS:
 914                         if (config_fov / 1.2 >= FOV_MIN)
 915                                 config_fov /= 1.2;
 916                         disp_fov:
 917                         {
 918                                 char text[16];
 919                                 sprintf(text, "%.2f", config_fov);
 920                                 osd_info("FOV", text);
 921                         }
 922                         break;
 923                 case KEYCODE_KP_MINUS:
 924                         if (config_fov * 1.2 <= FOV_MAX)
 925                                 config_fov *= 1.2;
 926                         goto disp_fov;
 927                 default: break;
 928                 }
 929                 /* do not pass keys to game while holding CTRL */
 930                 return;
 931         }
 932
 933         if (keycode == KEYCODE_PAUSE && down)
 934                 help_view ^= 1;
 935
 936         /* in help view we must not forward keypresses */
 937         if (help_view)
 938                 return;
 939
 940         switch (keycode) {
 941         case KEYCODE_LSHIFT:
 942                 set_amiga_key(keycode, down);
 943                 shift = down;
 944                 break;
 945         case KEYCODE_RSHIFT:
 946                 set_amiga_key(keycode, down);
 947                 shift = down;
 948                 break;
 949         case KEYCODE_LEFT:
 950                 if (shift && down) {
 951                         set_amiga_key(keycode, down);
 952                         set_joystick(-1, -1, -1, -1, -1);
 953                         break;
 954                 }
 955                 set_amiga_key(keycode, 0);
 956                 set_joystick(down, -1, -1, -1, -1);
 957                 break;
 958         case KEYCODE_RIGHT:
 959                 if (shift && down) {
 960                         set_amiga_key(keycode, down);
 961                         set_joystick(-1, -1, -1, -1, -1);
 962                         break;
 963                 }
 964                 set_amiga_key(keycode, 0);
 965                 set_joystick(-1, down, -1, -1, -1);
 966                 break;
 967         case KEYCODE_UP:
 968                 if (shift && down) {
 969                         set_amiga_key(keycode, down);
 970                         set_joystick(-1, -1, -1, -1, -1);
 971                         break;
 972                 }
 973                 set_amiga_key(keycode, 0);
 974                 set_joystick(-1, -1, down, -1, -1);
 975                 break;
 976         case KEYCODE_DOWN:
 977                 if (shift && down) {
 978                         set_amiga_key(keycode, down);
 979                         set_joystick(-1, -1, -1, -1, -1);
 980                         break;
 981                 }
 982                 set_amiga_key(keycode, 0);
 983                 set_joystick(-1, -1, -1, down, -1);
 984                 break;
 985         case KEYCODE_END:
 986                 set_joystick(-1, -1, -1, -1, down);
 987                 break;
 988         case KEYCODE_INSERT:
 989                 set_amiga_key(KEYCODE_HELP, down);
 990                 break;
 991         default:
 992                 set_amiga_key(keycode, down);
 993         }
 994 }
 995
 996 void audio_sdl(float *data, int length)
 997 {
 998         int fill, s;
 999
1000         /* read sound from sound buffer
1001          * buffer pointer read and write is atomic, so no locking required!
1002          */
1003         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1004         if (fill < length) {
1005 #ifdef DEBUG_SOUND_BUFFERING
1006                 fprintf(stderr, "sound buffer underrun\n");
1007 #endif
1008                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1009                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1010         }
1011         for (s = 0; s < length; s++) {
1012                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1013                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1014         }
1015 #ifdef DEBUG_SOUND_BUFFERING
1016         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1017 #endif
1018         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1019 }
1020
1021 void sound_irq(void)
1022 {
1023         /* trigger and execute IRQ 4 = sound */
1024         execute_cpu(4, NULL);
1025 }
1026
1027 int main(int argc, char *argv[])
1028 {
1029         int rc;
1030         int sdl_sound_chunk;
1031
1032         home_dir = getenv("HOME");
1033         if (!home_dir)
1034                 home_dir = "";
1035
1036         rc = parse_args(argc, argv);
1037         if (rc)
1038                 return 0;
1039
1040         /* allocate image */
1041         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1042         if (!image) {
1043                 print_error("Failed to allocate image buffer\n");
1044                 goto done;
1045         }
1046
1047         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1048                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1049                 goto done;
1050         }
1051         if ((1000 % IRQ_RATE)) {
1052                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1053                 goto done;
1054         }
1055
1056         /* calculate SDL chunk size for audio
1057          * it must be a power of two, but not more than the chunk size for each IRQ!
1058          */
1059         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1060                 ;
1061         sdl_sound_chunk >>= 1;
1062 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1063
1064         /* allocate sound buffers */
1065         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1066         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1067         if (!sound_buffer) {
1068                 print_error("Failed to allocate image buffer\n");
1069                 goto done;
1070         }
1071
1072         /* allocate memory */
1073         memory = calloc(MEMORY_SIZE, 1);
1074         if (!memory) {
1075                 print_error("Failed to allocate cpu's memory\n");
1076                 goto done;
1077         }
1078         stop_event = calloc(MEMORY_SIZE, 1);
1079         if (!stop_event) {
1080                 print_error("Failed to allocate cpu's stop_event memory\n");
1081                 goto done;
1082         }
1083         chipreg = calloc(IOSIZE, 1);
1084         if (!chipreg) {
1085                 print_error("Failed to allocate chip register\n");
1086                 goto done;
1087         }
1088
1089         /* init cpu code */
1090         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1091
1092         /* init disk emulation */
1093         disk_init(disk_read, disk_write);
1094
1095         /* load binary */
1096         mercenary_load();
1097
1098         /* patch some stuff */
1099         mercenary_patch();
1100
1101         /* init SDL and OpenGL */
1102 #ifdef HAVE_OVR
1103         int vbl_sync = 0;
1104         int rift = 1;
1105         int multisampling = 0;
1106         window_width = SCREEN_WIDTH;
1107         window_height = SCREEN_HEIGHT;
1108 #else
1109         int vbl_sync = 1;
1110         int rift = 0;
1111         int multisampling = config_multisampling;
1112         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1113         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1114 #endif
1115         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, multisampling, vbl_sync, rift);
1116         if (rc < 0)
1117                 goto done;
1118 #ifdef HAVE_OVR
1119         rc = init_ovr(config_multisampling);
1120         if (rc < 0)
1121                 goto done;
1122         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1123         if (rc < 0)
1124                 goto done;
1125 #endif
1126         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1127         if (rc < 0)
1128                 goto done;
1129
1130         /* init osd */
1131         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1132         if (rc < 0)
1133                 goto done;
1134         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1135         if (rc < 0)
1136                 goto done;
1137         help_osd = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1138         if (!help_osd)
1139                 goto done;
1140         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
1141         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1142                 "Emulation:\n"
1143                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1144                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1145                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1146                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1147                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1148                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1149                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1150                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1151                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1152 #ifdef HAVE_OVR
1153                 "        Press `CTRL' + `N' to normalize player position.\n"
1154 #endif
1155                 "\n"
1156                 "Answer to a Question:\n"
1157                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1158                 "\n"
1159                 "Walking / Driving / Flying:\n"
1160                 "        Use cursor keys as joystick, to move player / craft.\n"
1161                 "        Press `R' for running, 'W' for walking speed.\n"
1162                 "        Press `B' to board, `L' to leave.\n"
1163                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1164                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1165                 "        Press `SPACE' to stop craft.\n"
1166                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1167                 "        Press `T' for turbo on certain craft.\n"
1168                 "        Press `END' as joystick's fire button.\n"
1169                 "\n"
1170                 "Elevator:\n"
1171                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1172                 "\n"
1173                 "Inside a transporter:\n"
1174                 "        Press `1'...`0' to select destination.\n"
1175                 "\n"
1176                 "Items:\n"
1177                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1178                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1179                 "        Press `NUMPAD Enter' to select certain items.\n"
1180                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1181                 "        Press `NUMPAD *' to read entry\n"
1182                 "Saving / Loading / Pause:\n"
1183                 "        Press `INSERT' to loading and saving options.\n"
1184                 "        Press `ENTER' to pause game, other key to continue.\n"
1185                 ,HELP_ALPHA, 1, 2, 5, 0);
1186         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1187         if (!info_osd)
1188                 goto done;
1189
1190         /* init audio */
1191         sound_init(SOUND_SAMPLERATE, sound_irq);
1192
1193         /* start cpu */
1194         reset_cpu();
1195
1196         if (config_skip_intro)
1197                 skip_intro();
1198
1199         /* run game */
1200         main_loop();
1201
1202 done:
1203         exit_opengl();
1204 #ifdef HAVE_OVR
1205         exit_ovr();
1206 #endif
1207         exit_sdl();
1208
1209         if (chipreg)
1210                 free(chipreg);
1211         if (stop_event)
1212                 free(stop_event);
1213         if (memory)
1214                 free(memory);
1215         if (sound_buffer)
1216                 free(sound_buffer);
1217         if (image)
1218                 free(image);
1219         if (help_osd)
1220                 free(help_osd);
1221         if (info_osd)
1222                 free(info_osd);
1223
1224         return 0;
1225 }
1226