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 <sys/stat.h>
  24 #include <sys/types.h>
  25 #include "../libsdl/sdl.h"
  26 #include "../libsdl/opengl.h"
  27 #include "../libsdl/print.h"
  28 #include "../libcpu/m68k.h"
  29 #include "../libcpu/execute.h"
  30 #include "../libframerate/framerate.h"
  31 #include "../libvideo/video.h"
  32 #include "../libsound/sound.h"
  33 #include "../libjoystick/joystick.h"
  34 #include "../libkeyboard/keyboard.h"
  35 #include "../libdisk/disk.h"
  36 #include "mercenary.h"
  37 #include "render.h"
  38
  39 #define FOV_MIN         10.0
  40 #define FOV_NOVAGEN     64.0
  41 #define FOV_JOLLY       80.0
  42 #define FOV_MAX         170.0
  43
  44 static int config_ctrl_c = 0;
  45 static int config_amiga_speed = 1;
  46 static const char *config_gamesave_dir = ".mercenary";
  47 static int config_video_filter = 1;
  48 static int config_audio_filter = 1;
  49 static int config_render = 0;
  50 static int config_skip_intro = 0;
  51 static int config_multisampling = 16;
  52 static double config_fov = FOV_NOVAGEN;
  53 static double config_benson_size = 1.0;
  54 static int config_debug_transparent = 0;
  55 static int config_debug_opengl = 0;
  56 /* render improvements */
  57 static int config_improve_extend_roads = 0;     /* set to 1 to extend roads */
  58
  59 #define CPU_SPEED       7093790.0;
  60
  61 #define SOUND_SAMPLERATE 48000
  62 /* - game IRQ rate
  63  * - must be used for sound rendering chunk
  64  */
  65 #define IRQ_RATE        50
  66 /* numbe of buffer chunks to dejitter:
  67  * - SDL render interval
  68  * - sound rendering interval
  69  * - sound card interval
  70  * 4 should be minimum, if video rate is >=50 Hz
  71  */
  72 #define SOUND_CHUNKS    4
  73
  74 /* test sound to check if buffer does not overflow / underrun */
  75 //#define DEBUG_SOUND_BUFFERING
  76
  77 #define IOSIZE          0x1000 /* bytes in io space */
  78 #define MEMORY_SIZE     0x80000
  79 static uint8_t *memory = NULL;
  80 static uint8_t *stop_event = NULL;
  81 static uint8_t *image = NULL;
  82 #define SCREEN_WIDTH    320
  83 #define SCREEN_HEIGHT   200
  84 #define IMAGE_WIDTH     320
  85 #define IMAGE_HEIGHT    200
  86 #define BENSON_AT_LINE  136
  87 #define IMAGE_DIWSTART  0x2c
  88 static uint16_t *chipreg = NULL;
  89 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
  90 static int sound_buffer_size; /* buffer sample size */
  91 static int sound_buffer_writep; /* write pointer at buffer */
  92 static int sound_buffer_readp; /* read pointer at buffer */
  93 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
  94 static double benson_size; /* render size of benson */
  95 static int render_legacy = 0; /* render original amiga screen, if set */
  96 static int render_improved = 0; /* render improved image, if set */
  97 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
  98
  99 static const char *home_dir;
 100
 101 static int quit = 0;
 102
 103 int parse_args(int argc, char *argv[])
 104 {
 105         int i = 1;
 106
 107         while (argc > i) {
 108                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 109                         print_info("Usage: %s\n", argv[0]);
 110                         print_info(" -s --amiga-speed original | full\n");
 111                         print_info("        Set speed of rendering to original Amiga or full speed.\n");
 112                         print_info(" -v --video-filter on | off\n");
 113                         print_info("        Set video filter.\n");
 114                         print_info(" -a --audio-filter on | off\n");
 115                         print_info("        Set audio filter.\n");
 116                         print_info(" -r --render original | opegl\n");
 117                         print_info("        Set speed of rendering to original Amiga or full speed.\n");
 118                         print_info(" -b --benson normal | half\n");
 119                         print_info("        Size of 'Benson' (control panel).\n");
 120                         print_info(" -m --multisampling <samples>\n");
 121                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 122                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 123                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 124                         print_info(" -i --skip-intro\n");
 125                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 126                         print_info("Debug options:\n");
 127                         print_info(" -o --debug-opengl\n");
 128                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 129                         print_info("    --debug-transparent\n");
 130                         print_info("        Draw all things half transparent.\n");
 131                         print_info("    --ctrl-c\n");
 132                         print_info("        Use CTRL+C to exit game (used for development)\n");
 133                         return -1;
 134                 } else
 135                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--amiga-speed")) {
 136                         i++;
 137                         if (argc == i) {
 138 missing_parameter:
 139                                 print_info("Missing parameter, use '--help'!\n");
 140                                 return -1;
 141                         }
 142                         if (!strcmp(argv[i], "original"))
 143                                 config_amiga_speed = 1;
 144                         else
 145                         if (!strcmp(argv[i], "full"))
 146                                 config_amiga_speed = 0;
 147                         else {
 148 illegal_parameter:
 149                                 print_info("Illegal parameter, use '--help'!\n");
 150                                 return -1;
 151                         }
 152                 } else
 153                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 154                         i++;
 155                         if (argc == i)
 156                                 goto missing_parameter;
 157                         if (!strcmp(argv[i], "on"))
 158                                 config_video_filter = 1;
 159                         else
 160                         if (!strcmp(argv[i], "off"))
 161                                 config_video_filter = 0;
 162                         else
 163                                 goto illegal_parameter;
 164                 } else
 165                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 166                         i++;
 167                         if (argc == i)
 168                                 goto missing_parameter;
 169                         if (!strcmp(argv[i], "on"))
 170                                 config_audio_filter = 1;
 171                         else
 172                         if (!strcmp(argv[i], "off"))
 173                                 config_audio_filter = 0;
 174                         else
 175                                 goto illegal_parameter;
 176                 } else
 177                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 178                         i++;
 179                         if (argc == i)
 180                                 goto missing_parameter;
 181                         if (!strcmp(argv[i], "original"))
 182                                 config_render = 0;
 183                         else
 184                         if (!strcmp(argv[i], "opengl"))
 185                                 config_render = 1;
 186                         else
 187                                 goto illegal_parameter;
 188                 } else
 189                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 190                         i++;
 191                         if (argc == i)
 192                                 goto missing_parameter;
 193                         if (!strcmp(argv[i], "normal"))
 194                                 config_benson_size = 1.0;
 195                         else
 196                         if (!strcmp(argv[i], "half")) {
 197                                 config_benson_size = 0.5;
 198                                 if (config_fov == FOV_NOVAGEN)
 199                                         config_fov = FOV_JOLLY;
 200                         } else
 201                                 goto illegal_parameter;
 202                 } else
 203                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 204                         i++;
 205                         if (argc == i)
 206                                 goto missing_parameter;
 207                         config_multisampling = atoi(argv[i]);
 208                 } else
 209                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 210                         i++;
 211                         if (argc == i)
 212                                 goto missing_parameter;
 213                         config_fov = atof(argv[i]);
 214                         if (config_fov < 1.0 || config_fov > 179.0)
 215                                 goto illegal_parameter;
 216                 } else
 217                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 218                         config_skip_intro = 1;
 219                 } else
 220                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 221                         config_debug_opengl = 1;
 222                 } else
 223                 if (!strcmp(argv[i], "--debug-transparent")) {
 224                         config_debug_transparent = 1;
 225                 } else
 226                 if (!strcmp(argv[i], "--ctrl-c")) {
 227                         config_ctrl_c = 1;
 228                 } else {
 229                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 230                         return -1;
 231                 }
 232                 i++;
 233         }
 234
 235         return 0;
 236 }
 237
 238 static void special_event(int event)
 239 {
 240         if (render_improved)
 241                 render_capture_event(event);
 242 }
 243
 244 static void main_loop(void)
 245 {
 246         int had_first_irq = 0;
 247         static uint32_t current_time, last_time = 0, diff;
 248         int i, rc;
 249         int space, length;
 250         int cycle_count, event;
 251         double render_delay = 0.0;
 252         uint32_t palette_address;
 253         uint16_t palette[16];
 254
 255         last_time = SDL_GetTicks();
 256
 257         /* render result on window */
 258         while (!quit) {
 259 printf("frame rate: %.6f\n", 1.0 / vbl_duration);
 260                 /* handle SDL events */
 261                 rc = event_sdl();
 262                 if (rc)
 263                         break;
 264
 265                 /* clear screen */
 266                 opengl_clear();
 267
 268                 /* initialize rendering */
 269                 debug_opengl = config_debug_opengl;
 270                 benson_size = config_benson_size;
 271                 render_legacy = (!config_render) || debug_opengl;
 272                 render_improved = config_render || debug_opengl;
 273                 if (render_improved) {
 274                         opengl_viewport_improved(debug_opengl, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 275                         opengl_copy_last();
 276                 }
 277                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 278                 /* don't render if we still delay */
 279                 if (!render_delay) {
 280                         /* start capturing for improved graphics */
 281                         if (render_improved)
 282                                 render_capture_start(config_fov, config_improve_extend_roads, config_debug_transparent);
 283
 284                         /* execute until the rendered image is ready (wait for VBL) */
 285                         cycle_count = 0;
 286                         do {
 287                                 cycle_count += execute_cpu(0, &event);
 288                                 /* handle special events */
 289                                 if (event != STOP_AT_WAIT_VBL)
 290                                         special_event(event);
 291                         } while (event != STOP_AT_WAIT_VBL);
 292                         /* stop capturing for improved graphics */
 293                         if (render_improved)
 294                                 render_capture_stop();
 295                         /* copy palette */
 296                         palette_address = mercenary_palette_view();
 297                         for (i = 0; i < 16; i++)
 298                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 299                         /* for amiga speed: set delay by the number of cycles */
 300                         if (config_amiga_speed)
 301                                 render_delay = (double)cycle_count / CPU_SPEED;
 302                 }
 303                 /* render improved graphics */
 304                 if (render_improved)
 305                         render_all_items();
 306
 307                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 308                 if (had_first_irq) {
 309                         /* render game view without benson
 310                          * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 311                          */
 312                         if (render_legacy)
 313                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 314                 }
 315                 /* render benson on improved rendering, if enabled */
 316                 if (render_improved)
 317                         opengl_blit_benson(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size, (double_pixel_size) ? 2 : 1);
 318                 /* setup viewport for legacy image and render image, if enabled */
 319                 if (render_legacy) {
 320                         opengl_viewport_legacy(debug_opengl);
 321                         opengl_blit_legacy(image, config_video_filter);
 322                 }
 323                 /* wait for VBL and show */
 324                 swap_sdl();
 325                 /* measure frame rate */
 326                 framerate_measure();
 327
 328                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 329                 current_time = SDL_GetTicks();
 330                 diff = current_time - last_time;
 331                 /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 332                 if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 333                         diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 334                         last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 335                 }
 336                 while (diff > 1000 / IRQ_RATE) {
 337                         execute_cpu(3, NULL);
 338                         execute_cpu(4, NULL);
 339                         had_first_irq = 1;
 340                         /* transfer benson without game view
 341                          * because we only got benson refreshed during VBL IRQ
 342                          */
 343                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 344                         /* render sound to sound buffer
 345                          * buffer pointer read and write is atomic, so no locking required!
 346                          */
 347                         space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 348                         if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 349 #ifdef DEBUG_SOUND_BUFFERING
 350                                 fprintf(stderr, "sound buffer overflow\n");
 351 #endif
 352                                 length = space;
 353                         } else
 354                                 length = SOUND_SAMPLERATE / IRQ_RATE;
 355 #ifdef DEBUG_SOUND_BUFFERING
 356                         printf("can write %d, write %d\n", space, length);
 357                         static int cnt = 0;
 358                         int s;
 359                         for (s = 0; s < length; s++) {
 360                                 sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 361                                 sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 362                                         = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 363                                         * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 364                                         * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 365                                  cnt++;
 366                         }
 367 #else
 368                         render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 369 #endif
 370                         sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 371                         diff -= 1000 / IRQ_RATE;
 372                         last_time += 1000 / IRQ_RATE;
 373
 374                         /* count down render delay */
 375                         if (render_delay) {
 376                                 render_delay -= 1.0 / (double)IRQ_RATE;
 377                                 if (render_delay < 0.0)
 378                                         render_delay = 0.0;
 379                         }
 380                 }
 381         }
 382 }
 383
 384 static uint16_t io_read(uint32_t address)
 385 {
 386         uint16_t value = 0xffff;
 387
 388         /* joystick and fire button */
 389         if (address == 0xbfe000 || address == 0xdff00c)
 390                 value &= emulate_joystick_read(address);
 391         /* keyboard */
 392         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 393                 value &= emulate_keyboard_read(address);
 394         /* diskette */
 395         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 396                 value &= emulate_disk_read(address);
 397
 398         return value;
 399 }
 400
 401 static void io_write(uint32_t address, uint16_t value)
 402 {
 403         /* dmacon and sound registers */
 404         if (address == 0xdff096 || (address >= 0xdff0a0 && address <= 0xdff0df))
 405                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 406         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 407                 emulate_disk_write(address, value);
 408 }
 409
 410 /* two tracks with 0x1820 words of length */
 411 static uint8_t game_save[2][0x1820 << 1];
 412 static int last_track = 0;
 413
 414 /* game reads track with saved game */
 415 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 416 {
 417         if (length > sizeof(game_save[0])) {
 418                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 419                 return;
 420         }
 421
 422         /* if even track is selected, load game */
 423         if (!(track & 1)) {
 424                 char filename[256];
 425                 int gamesave_num = (track - 2) >> 1;
 426                 int got;
 427                 FILE *fp;
 428
 429                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 430 #if defined(_WIN32)
 431                 filename[0] = '\0';
 432 #else
 433                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 434                 mkdir(filename, 0777);
 435 #endif
 436                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 437                 fp = fopen(filename, "r");
 438                 if (!fp) {
 439 fail:
 440                         print_error("failed to load game from '%s'\n", filename);
 441                         goto copy;
 442                 }
 443                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 444                 fclose(fp);
 445                 if (got != 2)
 446                         goto fail;
 447         }
 448
 449 copy:
 450         /* copy track */
 451         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 452 }
 453
 454 /* game writes track with saved game */
 455 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 456 {
 457         /* skip sync info that is provided by game and only relevant for a real disk track */
 458         data += 0x200;
 459         length -= 0x200;
 460
 461         if (length != sizeof(game_save[0])) {
 462                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 463                 return;
 464         }
 465
 466         /* don't save if last track is the same, because disk is written on both sides with the same data */
 467         if (track == last_track) {
 468                 if (memcmp(memory + data, game_save[track & 1], length)) {
 469                         print_error("saving game data on other side of the disk is different, please fix!\n");
 470                 }
 471                 return;
 472         }
 473         last_track = track;
 474
 475         /* save game data */
 476         memcpy(game_save[track & 1], memory + data, length);
 477
 478         /* if done with saving */
 479         if ((track & 1)) {
 480                 char filename[256];
 481                 int gamesave_num = (track - 2) >> 1;
 482                 int wrote;
 483                 FILE *fp;
 484
 485 #if defined(_WIN32)
 486                 filename[0] = '\0';
 487 #else
 488                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 489                 mkdir(filename, 0777);
 490 #endif
 491                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 492                 fp = fopen(filename, "w");
 493                 if (!fp) {
 494 fail:
 495                         print_error("failed to save game to '%s'\n", filename);
 496                         return;
 497                 }
 498                 print_info("Game state saved to '%s'\n", filename);
 499                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 500                 fclose(fp);
 501                 if (wrote != 2)
 502                         goto fail;
 503         }
 504 }
 505
 506 static int shift = 0, ctrl = 0;
 507
 508 static void keyboard_sdl(int down, SDL_Keycode sym)
 509 {
 510         switch (sym) {
 511         case SDLK_LCTRL:
 512         case SDLK_RCTRL:
 513                 ctrl = down;
 514                 break;
 515         }
 516
 517         if (ctrl && down) {
 518                 switch (sym) {
 519                 case SDLK_v:
 520                         config_video_filter ^= 1;
 521                         print_info("video filter: %s\n", (config_video_filter) ? "on" : "off");
 522                         break;
 523                 case SDLK_a:
 524                         config_audio_filter ^= 1;
 525                         print_info("audio filter: %s\n", (config_audio_filter) ? "on" : "off");
 526                         break;
 527                 case SDLK_s:
 528                         config_amiga_speed ^= 1;
 529                         print_info("amiga speed: %s\n", (config_amiga_speed) ? "original" : "full");
 530                         break;
 531                 case SDLK_r:
 532                         config_render ^= 1;
 533                         print_info("render: %s\n", (config_render) ? "opengl" : "original");
 534                         break;
 535                 case SDLK_b:
 536                         if (config_benson_size == 0.5) {
 537                                 config_benson_size = 1.0;
 538                                 config_fov = FOV_NOVAGEN;
 539                         } else {
 540                                 config_benson_size = 0.5;
 541                                 config_fov = FOV_JOLLY;
 542                         }
 543                         print_info("benson: %s\n", (config_benson_size == 0.5) ? "half" : "normal");
 544                         break;
 545                 case SDLK_c:
 546                         if (config_ctrl_c)
 547                                 quit = 1;
 548                         break;
 549                 case SDLK_KP_PLUS:
 550                         if (config_fov / 1.2 >= FOV_MIN)
 551                                 config_fov /= 1.2;
 552                         print_info("FOV: %.2f\n", config_fov);
 553                         break;
 554                 case SDLK_KP_MINUS:
 555                         if (config_fov * 1.2 <= FOV_MAX)
 556                                 config_fov *= 1.2;
 557                         print_info("FOV: %.2f\n", config_fov);
 558                         break;
 559                 }
 560                 /* do not pass keys to game while holding CTRL */
 561                 return;
 562         }
 563
 564         switch (sym) {
 565         case SDLK_LSHIFT:
 566                 set_key("LSH", down);
 567                 shift = down;
 568                 break;
 569         case SDLK_RSHIFT:
 570                 set_key("RSH", down);
 571                 shift = down;
 572                 break;
 573         case SDLK_LEFT:
 574                 if (shift && down) {
 575                         set_key("LF", down);
 576                         set_joystick(-1, -1, -1, -1, -1);
 577                         break;
 578                 }
 579                 set_key("LF", 0);
 580                 set_joystick(down, -1, -1, -1, -1);
 581                 break;
 582         case SDLK_RIGHT:
 583                 if (shift && down) {
 584                         set_key("RT", down);
 585                         set_joystick(-1, -1, -1, -1, -1);
 586                         break;
 587                 }
 588                 set_key("RT", 0);
 589                 set_joystick(-1, down, -1, -1, -1);
 590                 break;
 591         case SDLK_UP:
 592                 if (shift && down) {
 593                         set_key("UP", down);
 594                         set_joystick(-1, -1, -1, -1, -1);
 595                         break;
 596                 }
 597                 set_key("UP", 0);
 598                 set_joystick(-1, -1, down, -1, -1);
 599                 break;
 600         case SDLK_DOWN:
 601                 if (shift && down) {
 602                         set_key("DN", down);
 603                         set_joystick(-1, -1, -1, -1, -1);
 604                         break;
 605                 }
 606                 set_key("DN", 0);
 607                 set_joystick(-1, -1, -1, down, -1);
 608                 break;
 609         case SDLK_END:
 610                 set_joystick(-1, -1, -1, -1, down);
 611                 break;
 612
 613         case SDLK_a: set_key("A", down); break;
 614         case SDLK_b: set_key("B", down); break;
 615         case SDLK_c: set_key("C", down); break;
 616         case SDLK_d: set_key("D", down); break;
 617         case SDLK_e: set_key("E", down); break;
 618         case SDLK_f: set_key("F", down); break;
 619         case SDLK_g: set_key("G", down); break;
 620         case SDLK_h: set_key("H", down); break;
 621         case SDLK_i: set_key("I", down); break;
 622         case SDLK_j: set_key("J", down); break;
 623         case SDLK_k: set_key("K", down); break;
 624         case SDLK_l: set_key("L", down); break;
 625         case SDLK_m: set_key("M", down); break;
 626         case SDLK_n: set_key("N", down); break;
 627         case SDLK_o: set_key("O", down); break;
 628         case SDLK_p: set_key("P", down); break;
 629         case SDLK_q: set_key("Q", down); break;
 630         case SDLK_r: set_key("R", down); break;
 631         case SDLK_s: set_key("S", down); break;
 632         case SDLK_t: set_key("T", down); break;
 633         case SDLK_u: set_key("U", down); break;
 634         case SDLK_v: set_key("V", down); break;
 635         case SDLK_w: set_key("W", down); break;
 636         case SDLK_x: set_key("X", down); break;
 637         case SDLK_y: set_key("Y", down); break;
 638         case SDLK_z: set_key("Z", down); break;
 639
 640         case SDLK_0: set_key("0", down); break;
 641         case SDLK_1: set_key("1", down); break;
 642         case SDLK_2: set_key("2", down); break;
 643         case SDLK_3: set_key("3", down); break;
 644         case SDLK_4: set_key("4", down); break;
 645         case SDLK_5: set_key("5", down); break;
 646         case SDLK_6: set_key("6", down); break;
 647         case SDLK_7: set_key("7", down); break;
 648         case SDLK_8: set_key("8", down); break;
 649         case SDLK_9: set_key("9", down); break;
 650
 651         case SDLK_KP_0: set_key("NP0", down); break;
 652         case SDLK_KP_1: set_key("NP1", down); break;
 653         case SDLK_KP_2: set_key("NP2", down); break;
 654         case SDLK_KP_3: set_key("NP3", down); break;
 655         case SDLK_KP_4: set_key("NP4", down); break;
 656         case SDLK_KP_5: set_key("NP5", down); break;
 657         case SDLK_KP_6: set_key("NP6", down); break;
 658         case SDLK_KP_7: set_key("NP7", down); break;
 659         case SDLK_KP_8: set_key("NP8", down); break;
 660         case SDLK_KP_9: set_key("NP9", down); break;
 661         case SDLK_KP_DIVIDE: set_key("NPDIV", down); break;
 662         case SDLK_KP_MULTIPLY: set_key("NPMUL", down); break;
 663         case SDLK_KP_MINUS: set_key("NPSUB", down); break;
 664         case SDLK_KP_PLUS: set_key("NPADD", down); break;
 665         case SDLK_KP_PERIOD: set_key("NPDEL", down); break;
 666         // NPLPAREN and NPRPAREN are not emulated
 667
 668         case SDLK_F1: set_key("F1", down); break;
 669         case SDLK_F2: set_key("F2", down); break;
 670         case SDLK_F3: set_key("F3", down); break;
 671         case SDLK_F4: set_key("F4", down); break;
 672         case SDLK_F5: set_key("F5", down); break;
 673         case SDLK_F6: set_key("F6", down); break;
 674         case SDLK_F7: set_key("F7", down); break;
 675         case SDLK_F8: set_key("F8", down); break;
 676         case SDLK_F9: set_key("F9", down); break;
 677         case SDLK_F10: set_key("F10", down); break;
 678
 679         case SDLK_SPACE: set_key("SPC", down); break;
 680         case SDLK_BACKSPACE: set_key("BS", down); break;
 681         case SDLK_TAB: set_key("TAB", down); break;
 682         case SDLK_KP_ENTER: set_key("ENT", down); break;
 683         case SDLK_RETURN: set_key("RET", down); break;
 684         case SDLK_ESCAPE: set_key("ESC", down); break;
 685         case SDLK_DELETE: set_key("DEL", down); break;
 686         case SDLK_INSERT: set_key("HELP", down); break;
 687
 688         }
 689 }
 690
 691 void audio_sdl(float *data, int length)
 692 {
 693         int fill, s;
 694
 695         /* read sound from sound buffer
 696          * buffer pointer read and write is atomic, so no locking required!
 697          */
 698         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
 699         if (fill < length) {
 700 #ifdef DEBUG_SOUND_BUFFERING
 701                 fprintf(stderr, "sound buffer underrun\n");
 702 #endif
 703                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
 704                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
 705         }
 706         for (s = 0; s < length; s++) {
 707                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
 708                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
 709         }
 710 #ifdef DEBUG_SOUND_BUFFERING
 711         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
 712 #endif
 713         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
 714 }
 715
 716 int main(int argc, char *argv[])
 717 {
 718         int rc;
 719         int sdl_sound_chunk;
 720
 721         home_dir = getenv("HOME");
 722         if (!home_dir)
 723                 home_dir = "";
 724
 725         rc = parse_args(argc, argv);
 726         if (rc)
 727                 return 0;
 728
 729         /* allocate image */
 730         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
 731         if (!image) {
 732                 print_error("Failed to allocate image buffer\n");
 733                 goto done;
 734         }
 735
 736         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
 737                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
 738                 goto done;
 739         }
 740         if ((1000 % IRQ_RATE)) {
 741                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
 742                 goto done;
 743         }
 744
 745         /* calculate SDL chunk size for audio
 746          * it must be a power of two, but not more than the chunk size for each IRQ!
 747          */
 748         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
 749                 ;
 750         sdl_sound_chunk >>= 1;
 751 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
 752
 753         /* allocate sound buffers */
 754         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
 755         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
 756         if (!sound_buffer) {
 757                 print_error("Failed to allocate image buffer\n");
 758                 goto done;
 759         }
 760
 761         /* allocate memory */
 762         memory = calloc(MEMORY_SIZE, 1);
 763         if (!memory) {
 764                 print_error("Failed to allocate cpu's memory\n");
 765                 goto done;
 766         }
 767         stop_event = calloc(MEMORY_SIZE, 1);
 768         if (!stop_event) {
 769                 print_error("Failed to allocate cpu's stop_event memory\n");
 770                 goto done;
 771         }
 772         chipreg = calloc(IOSIZE, 1);
 773         if (!chipreg) {
 774                 print_error("Failed to allocate chip register\n");
 775                 goto done;
 776         }
 777
 778         /* init cpu code */
 779         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
 780
 781         /* init disk emulation */
 782         disk_init(disk_read, disk_write);
 783
 784         /* load binary */
 785         mercenary_load();
 786
 787         /* patch some stuff */
 788         mercenary_patch();
 789
 790         /* init SDL and OpenGL */
 791         rc = init_sdl(argv[0], (config_debug_opengl) ? SCREEN_WIDTH * 2 : SCREEN_WIDTH * 3, (config_debug_opengl) ? SCREEN_HEIGHT * 4 : SCREEN_HEIGHT * 3, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, config_multisampling);
 792         if (rc < 0)
 793                 goto done;
 794         rc = init_opengl((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
 795         if (rc < 0)
 796                 goto done;
 797         resize_opengl((config_debug_opengl) ? SCREEN_WIDTH * 2 : SCREEN_WIDTH * 3, (config_debug_opengl) ? SCREEN_HEIGHT * 4 : SCREEN_HEIGHT * 3);
 798
 799         /* init audio filter */
 800         sound_init_filter(SOUND_SAMPLERATE);
 801
 802         /* start cpu */
 803         reset_cpu();
 804
 805         if (config_skip_intro) {
 806                 int event;
 807
 808                 print_info("*** Skipping intro, fast forwarding... ***\n\n");
 809                 do {
 810                         execute_cpu(0, &event);
 811                 } while (event != STOP_AT_CLEAR_SCREEN1);
 812                 do {
 813                         execute_cpu(0, &event);
 814                 } while (event != STOP_AT_WAIT_VBL);
 815         }
 816
 817         print_info("**********************************\n");
 818         print_info("* Welcome to Mercenary Reloaded! *\n");
 819         print_info("**********************************\n\n");
 820         print_info("Press CTRL + cursor keys to select inventory or pickup/drop item.\n");
 821         print_info("Press CTRL + f to toggle full screen.\n");
 822         print_info("Press CTRL + s to toggle rendering speed.\n");
 823         print_info("Press CTRL + v to toggle video filter.\n");
 824         print_info("Press CTRL + a to toggle audio filter.\n");
 825         print_info("Press CTRL + r to toggle rendering with opengl or orignal code.\n");
 826         print_info("Press CTRL + Keypad Plus to decrement FOV.\n");
 827         print_info("Press CTRL + Keypad Minus to increment FOV.\n");
 828         print_info("Press CTRL + c to exit game.\n\n");
 829         print_info("Use '--help' as command line option for configuration settings.\n\n");
 830
 831         /* run game */
 832         main_loop();
 833
 834 done:
 835         exit_opengl();
 836         exit_sdl();
 837
 838         if (chipreg)
 839                 free(chipreg);
 840         if (stop_event)
 841                 free(stop_event);
 842         if (memory)
 843                 free(memory);
 844         if (sound_buffer)
 845                 free(sound_buffer);
 846         if (image)
 847                 free(image);
 848
 849         return 0;
 850 }
 851