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 #warning fixme: make use of 10 for intro, then be as fast as given
  47 static double config_fps = 16.0;
  48 static const char *config_gamesave_dir = ".mercenary";
  49 static int config_video_filter = 1;
  50 static int config_audio_filter = 1;
  51 static int config_render = 0;
  52 static int config_skip_intro = 0;
  53 static int config_multisampling = 16;
  54 static double config_fov = FOV_NOVAGEN;
  55 static double config_benson_size = 1.0;
  56 static int config_debug_transparent = 0;
  57 static int config_debug_opengl = 0;
  58 /* render improvements */
  59 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  60
  61 #define CPU_SPEED       7093790.0;
  62
  63 #define SOUND_SAMPLERATE 48000
  64 /* - game IRQ rate
  65  * - must be used for sound rendering chunk
  66  */
  67 #define IRQ_RATE        50
  68 /* numbe of buffer chunks to dejitter:
  69  * - SDL render interval
  70  * - sound rendering interval
  71  * - sound card interval
  72  * 4 should be minimum, if video rate is >=50 Hz
  73  */
  74 #define SOUND_CHUNKS    4
  75
  76 /* test sound to check if buffer does not overflow / underrun */
  77 //#define DEBUG_SOUND_BUFFERING
  78
  79 #define IOSIZE          0x1000 /* bytes in io space */
  80 #define MEMORY_SIZE     0x80000
  81 static uint8_t *memory = NULL;
  82 static uint8_t *stop_event = NULL;
  83 static uint8_t *image = NULL;
  84 #define SCREEN_WIDTH    320
  85 #define SCREEN_HEIGHT   200
  86 #define IMAGE_WIDTH     320
  87 #define IMAGE_HEIGHT    200
  88 #define BENSON_AT_LINE  136
  89 #define IMAGE_DIWSTART  0x2c
  90 static uint16_t *chipreg = NULL;
  91 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
  92 static int sound_buffer_size; /* buffer sample size */
  93 static int sound_buffer_writep; /* write pointer at buffer */
  94 static int sound_buffer_readp; /* read pointer at buffer */
  95 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
  96 static double benson_size; /* render size of benson */
  97 static int render_legacy = 0; /* render original amiga screen, if set */
  98 static int render_improved = 0; /* render improved image, if set */
  99 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 100
 101 static const char *home_dir;
 102
 103 static int quit = 0;
 104
 105 int parse_args(int argc, char *argv[])
 106 {
 107         int i = 1;
 108
 109         while (argc > i) {
 110                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 111                         print_info("Usage: %s\n", argv[0]);
 112                         print_info(" -s --render-speed original | fast\n");
 113                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 114                         print_info("    --fps <fps>\n");
 115                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 116                         print_info(" -v --video-filter on | off\n");
 117                         print_info("        Set video filter.\n");
 118                         print_info(" -a --audio-filter on | off\n");
 119                         print_info("        Set audio filter.\n");
 120                         print_info(" -r --render original | opengl\n");
 121                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 122                         print_info(" -b --benson normal | half\n");
 123                         print_info("        Size of 'Benson' (control panel).\n");
 124                         print_info(" -m --multisampling <samples>\n");
 125                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 126                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 127                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 128                         print_info(" -i --skip-intro\n");
 129                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 130                         print_info("Debug options:\n");
 131                         print_info(" -o --debug-opengl\n");
 132                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 133                         print_info("    --debug-transparent\n");
 134                         print_info("        Draw all things half transparent.\n");
 135                         print_info("    --ctrl-c\n");
 136                         print_info("        Use CTRL+C to exit game (used for development)\n");
 137                         return -1;
 138                 } else
 139                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 140                         i++;
 141                         if (argc == i) {
 142 missing_parameter:
 143                                 print_info("Missing parameter, use '--help'!\n");
 144                                 return -1;
 145                         }
 146                         if (!strcmp(argv[i], "original"))
 147                                 config_amiga_speed = 1;
 148                         else
 149                         if (!strcmp(argv[i], "fast"))
 150                                 config_amiga_speed = 0;
 151                         else {
 152 illegal_parameter:
 153                                 print_info("Illegal parameter, use '--help'!\n");
 154                                 return -1;
 155                         }
 156                 } else
 157                 if (!strcmp(argv[i], "--fps")) {
 158                         i++;
 159                         if (argc == i)
 160                                 goto missing_parameter;
 161                         config_fps = atof(argv[i]);
 162                         if (config_fov <= 0.0)
 163                                 goto illegal_parameter;
 164                 } else
 165                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 166                         i++;
 167                         if (argc == i)
 168                                 goto missing_parameter;
 169                         if (!strcmp(argv[i], "on"))
 170                                 config_video_filter = 1;
 171                         else
 172                         if (!strcmp(argv[i], "off"))
 173                                 config_video_filter = 0;
 174                         else
 175                                 goto illegal_parameter;
 176                 } else
 177                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 178                         i++;
 179                         if (argc == i)
 180                                 goto missing_parameter;
 181                         if (!strcmp(argv[i], "on"))
 182                                 config_audio_filter = 1;
 183                         else
 184                         if (!strcmp(argv[i], "off"))
 185                                 config_audio_filter = 0;
 186                         else
 187                                 goto illegal_parameter;
 188                 } else
 189                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 190                         i++;
 191                         if (argc == i)
 192                                 goto missing_parameter;
 193                         if (!strcmp(argv[i], "original"))
 194                                 config_render = 0;
 195                         else
 196                         if (!strcmp(argv[i], "opengl"))
 197                                 config_render = 1;
 198                         else
 199                                 goto illegal_parameter;
 200                 } else
 201                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 202                         i++;
 203                         if (argc == i)
 204                                 goto missing_parameter;
 205                         if (!strcmp(argv[i], "normal"))
 206                                 config_benson_size = 1.0;
 207                         else
 208                         if (!strcmp(argv[i], "half")) {
 209                                 config_benson_size = 0.5;
 210                                 if (config_fov == FOV_NOVAGEN)
 211                                         config_fov = FOV_JOLLY;
 212                         } else
 213                                 goto illegal_parameter;
 214                 } else
 215                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 216                         i++;
 217                         if (argc == i)
 218                                 goto missing_parameter;
 219                         config_multisampling = atoi(argv[i]);
 220                 } else
 221                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 222                         i++;
 223                         if (argc == i)
 224                                 goto missing_parameter;
 225                         config_fov = atof(argv[i]);
 226                         if (config_fov < 1.0 || config_fov > 179.0)
 227                                 goto illegal_parameter;
 228                 } else
 229                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 230                         config_skip_intro = 1;
 231                 } else
 232                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 233                         config_debug_opengl = 1;
 234                 } else
 235                 if (!strcmp(argv[i], "--debug-transparent")) {
 236                         config_debug_transparent = 1;
 237                 } else
 238                 if (!strcmp(argv[i], "--ctrl-c")) {
 239                         config_ctrl_c = 1;
 240                 } else {
 241                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 242                         return -1;
 243                 }
 244                 i++;
 245         }
 246
 247         return 0;
 248 }
 249
 250 static void special_event(int event)
 251 {
 252         if (render_improved)
 253                 render_capture_event(event);
 254 }
 255
 256 static void main_loop(void)
 257 {
 258         double frame_step, frame_time = 0.0, frame_render = 1;
 259         int had_first_irq = 0;
 260         static uint32_t current_time, last_time = 0, diff;
 261         int i, rc;
 262         int space, length;
 263         int cycle_count, event = STOP_AT_END;
 264         double render_delay = 0.0;
 265         uint32_t palette_address;
 266         uint16_t palette[16];
 267
 268         last_time = SDL_GetTicks();
 269
 270         /* render result on window */
 271         while (!quit) {
 272 #warning oder ganz anders: bevor landung machen wir amiga-rate als interpolation
 273                 /* if we are in interstellar fligt, we use 50 Hz */
 274                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 275                 /* else we use whatever frame rate the user wants */
 276                 if (render_capture_is_interstellar())
 277                         frame_step = vbl_duration * 50.0;
 278                 else
 279                         frame_step = vbl_duration * config_fps;
 280                 if (frame_step > 1.0)
 281                         frame_step = 1.0;
 282                 /* handle SDL events */
 283                 rc = event_sdl();
 284                 if (rc)
 285                         break;
 286
 287                 /* clear screen */
 288                 opengl_clear();
 289
 290                 /* initialize rendering */
 291                 debug_opengl = config_debug_opengl;
 292                 benson_size = config_benson_size;
 293                 render_legacy = (!config_render) || debug_opengl;
 294                 render_improved = config_render || debug_opengl;
 295                 if (!render_improved) {
 296                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 297                         render_capture_reset();
 298                 }
 299                 if (render_improved) {
 300                         opengl_viewport_improved(debug_opengl, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 301                         opengl_copy_last();
 302                 }
 303                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 304                 /* amgia speed: don't render if we still delay */
 305                 /* non amiga speed: render if we need a new frame */
 306                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 307                 if ((frame_render && !config_amiga_speed)
 308                  || (config_amiga_speed && render_delay <= 0.0)
 309                  || event == STOP_AT_WAIT_INPUT) {
 310                         frame_render = 0;
 311                         /* start capturing for improved graphics */
 312                         if (render_improved)
 313                                 render_capture_start(config_fov, config_improve_extend_roads, config_debug_transparent);
 314
 315                         /* execute until the rendered image is ready (wait for VBL) */
 316                         cycle_count = 0;
 317                         do {
 318                                 cycle_count += execute_cpu(0, &event);
 319                                 /* handle special events */
 320                                 special_event(event);
 321                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 322                         /* stop capturing for improved graphics */
 323                         if (render_improved)
 324                                 render_capture_stop();
 325                         /* copy palette */
 326                         palette_address = mercenary_palette_view();
 327                         for (i = 0; i < 16; i++)
 328                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 329                         /* for amiga speed: set delay by the number of cycles */
 330                         if (config_amiga_speed)
 331                                 render_delay += (double)cycle_count / CPU_SPEED;
 332                 }
 333                 /* render improved graphics, interpolate, if required */
 334                 if (render_improved)
 335                         render_all_items((config_amiga_speed) ? 1.0 : frame_time);
 336                 /* advance frame time */
 337 printf("frame rate: %.6f, frame-step=%.5f frame-time=%.5f\n", 1.0 / vbl_duration, frame_step,frame_time);
 338                 frame_time += frame_step;
 339                 if (frame_time >= 1.0) {
 340                         frame_time -= 1.0;
 341                         frame_render = 1;
 342                 }
 343
 344                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 345                 if (had_first_irq) {
 346                         /* render game view without benson
 347                          * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 348                          */
 349                         if (render_legacy)
 350                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 351                 }
 352                 /* render benson on improved rendering, if enabled */
 353                 if (render_improved)
 354                         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);
 355                 /* setup viewport for legacy image and render image, if enabled */
 356                 if (render_legacy) {
 357                         opengl_viewport_legacy(debug_opengl);
 358                         opengl_blit_legacy(image, config_video_filter);
 359                 }
 360                 /* wait for VBL and show */
 361                 swap_sdl();
 362                 /* measure frame rate */
 363                 framerate_measure();
 364
 365                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 366                 current_time = SDL_GetTicks();
 367                 diff = current_time - last_time;
 368                 /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 369                 if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 370                         diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 371                         last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 372                 }
 373                 while (diff > 1000 / IRQ_RATE) {
 374                         execute_cpu(3, NULL);
 375                         execute_cpu(4, NULL);
 376                         had_first_irq = 1;
 377                         /* transfer benson without game view
 378                          * because we only got benson refreshed during VBL IRQ
 379                          */
 380                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 381                         /* render sound to sound buffer
 382                          * buffer pointer read and write is atomic, so no locking required!
 383                          */
 384                         space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 385                         if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 386 #ifdef DEBUG_SOUND_BUFFERING
 387                                 fprintf(stderr, "sound buffer overflow\n");
 388 #endif
 389                                 length = space;
 390                         } else
 391                                 length = SOUND_SAMPLERATE / IRQ_RATE;
 392 #ifdef DEBUG_SOUND_BUFFERING
 393                         printf("can write %d, write %d\n", space, length);
 394                         static int cnt = 0;
 395                         int s;
 396                         for (s = 0; s < length; s++) {
 397                                 sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 398                                 sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 399                                         = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 400                                         * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 401                                         * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 402                                  cnt++;
 403                         }
 404 #else
 405                         render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 406 #endif
 407                         sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 408                         diff -= 1000 / IRQ_RATE;
 409                         last_time += 1000 / IRQ_RATE;
 410
 411                         /* count down render delay */
 412                         if (render_delay) {
 413                                 render_delay -= 1.0 / (double)IRQ_RATE;
 414                                 if (render_delay < 0.0)
 415                                         render_delay = 0.0;
 416                         }
 417                 }
 418         }
 419 }
 420
 421 static uint16_t io_read(uint32_t address)
 422 {
 423         uint16_t value = 0xffff;
 424
 425         /* joystick and fire button */
 426         if (address == 0xbfe000 || address == 0xdff00c)
 427                 value &= emulate_joystick_read(address);
 428         /* keyboard */
 429         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 430                 value &= emulate_keyboard_read(address);
 431         /* diskette */
 432         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 433                 value &= emulate_disk_read(address);
 434
 435         return value;
 436 }
 437
 438 static void io_write(uint32_t address, uint16_t value)
 439 {
 440         /* dmacon and sound registers */
 441         if (address == 0xdff096 || (address >= 0xdff0a0 && address <= 0xdff0df))
 442                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 443         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 444                 emulate_disk_write(address, value);
 445 }
 446
 447 /* two tracks with 0x1820 words of length */
 448 static uint8_t game_save[2][0x1820 << 1];
 449 static int last_track = 0;
 450
 451 /* game reads track with saved game */
 452 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 453 {
 454         if (length > sizeof(game_save[0])) {
 455                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 456                 return;
 457         }
 458
 459         /* if even track is selected, load game */
 460         if (!(track & 1)) {
 461                 char filename[256];
 462                 int gamesave_num = (track - 2) >> 1;
 463                 int got;
 464                 FILE *fp;
 465
 466                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 467 #if defined(_WIN32)
 468                 filename[0] = '\0';
 469 #else
 470                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 471                 mkdir(filename, 0777);
 472 #endif
 473                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 474                 fp = fopen(filename, "r");
 475                 if (!fp) {
 476 fail:
 477                         print_error("failed to load game from '%s'\n", filename);
 478                         goto copy;
 479                 }
 480                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 481                 fclose(fp);
 482                 if (got != 2)
 483                         goto fail;
 484         }
 485
 486 copy:
 487         /* copy track */
 488         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 489 }
 490
 491 /* game writes track with saved game */
 492 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 493 {
 494         /* skip sync info that is provided by game and only relevant for a real disk track */
 495         data += 0x200;
 496         length -= 0x200;
 497
 498         if (length != sizeof(game_save[0])) {
 499                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 500                 return;
 501         }
 502
 503         /* don't save if last track is the same, because disk is written on both sides with the same data */
 504         if (track == last_track) {
 505                 if (memcmp(memory + data, game_save[track & 1], length)) {
 506                         print_error("saving game data on other side of the disk is different, please fix!\n");
 507                 }
 508                 return;
 509         }
 510         last_track = track;
 511
 512         /* save game data */
 513         memcpy(game_save[track & 1], memory + data, length);
 514
 515         /* if done with saving */
 516         if ((track & 1)) {
 517                 char filename[256];
 518                 int gamesave_num = (track - 2) >> 1;
 519                 int wrote;
 520                 FILE *fp;
 521
 522 #if defined(_WIN32)
 523                 filename[0] = '\0';
 524 #else
 525                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 526                 mkdir(filename, 0777);
 527 #endif
 528                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 529                 fp = fopen(filename, "w");
 530                 if (!fp) {
 531 fail:
 532                         print_error("failed to save game to '%s'\n", filename);
 533                         return;
 534                 }
 535                 print_info("Game state saved to '%s'\n", filename);
 536                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 537                 fclose(fp);
 538                 if (wrote != 2)
 539                         goto fail;
 540         }
 541 }
 542
 543 static int shift = 0, ctrl = 0;
 544
 545 static void keyboard_sdl(int down, SDL_Keycode sym)
 546 {
 547         switch (sym) {
 548         case SDLK_LCTRL:
 549         case SDLK_RCTRL:
 550                 ctrl = down;
 551                 break;
 552         }
 553
 554         if (ctrl && down) {
 555                 switch (sym) {
 556                 case SDLK_v:
 557                         config_video_filter ^= 1;
 558                         print_info("video filter: %s\n", (config_video_filter) ? "on" : "off");
 559                         break;
 560                 case SDLK_a:
 561                         config_audio_filter ^= 1;
 562                         print_info("audio filter: %s\n", (config_audio_filter) ? "on" : "off");
 563                         break;
 564                 case SDLK_s:
 565                         config_amiga_speed ^= 1;
 566                         print_info("amiga speed: %s\n", (config_amiga_speed) ? "original" : "full");
 567                         break;
 568                 case SDLK_r:
 569                         config_render ^= 1;
 570                         print_info("render: %s\n", (config_render) ? "opengl" : "original");
 571                         break;
 572                 case SDLK_b:
 573                         if (config_benson_size == 0.5) {
 574                                 config_benson_size = 1.0;
 575                                 config_fov = FOV_NOVAGEN;
 576                         } else {
 577                                 config_benson_size = 0.5;
 578                                 config_fov = FOV_JOLLY;
 579                         }
 580                         print_info("benson: %s\n", (config_benson_size == 0.5) ? "half" : "normal");
 581                         break;
 582                 case SDLK_c:
 583                         if (config_ctrl_c)
 584                                 quit = 1;
 585                         break;
 586                 case SDLK_KP_PLUS:
 587                         if (config_fov / 1.2 >= FOV_MIN)
 588                                 config_fov /= 1.2;
 589                         print_info("FOV: %.2f\n", config_fov);
 590                         break;
 591                 case SDLK_KP_MINUS:
 592                         if (config_fov * 1.2 <= FOV_MAX)
 593                                 config_fov *= 1.2;
 594                         print_info("FOV: %.2f\n", config_fov);
 595                         break;
 596                 }
 597                 /* do not pass keys to game while holding CTRL */
 598                 return;
 599         }
 600
 601         switch (sym) {
 602         case SDLK_LSHIFT:
 603                 set_key("LSH", down);
 604                 shift = down;
 605                 break;
 606         case SDLK_RSHIFT:
 607                 set_key("RSH", down);
 608                 shift = down;
 609                 break;
 610         case SDLK_LEFT:
 611                 if (shift && down) {
 612                         set_key("LF", down);
 613                         set_joystick(-1, -1, -1, -1, -1);
 614                         break;
 615                 }
 616                 set_key("LF", 0);
 617                 set_joystick(down, -1, -1, -1, -1);
 618                 break;
 619         case SDLK_RIGHT:
 620                 if (shift && down) {
 621                         set_key("RT", down);
 622                         set_joystick(-1, -1, -1, -1, -1);
 623                         break;
 624                 }
 625                 set_key("RT", 0);
 626                 set_joystick(-1, down, -1, -1, -1);
 627                 break;
 628         case SDLK_UP:
 629                 if (shift && down) {
 630                         set_key("UP", down);
 631                         set_joystick(-1, -1, -1, -1, -1);
 632                         break;
 633                 }
 634                 set_key("UP", 0);
 635                 set_joystick(-1, -1, down, -1, -1);
 636                 break;
 637         case SDLK_DOWN:
 638                 if (shift && down) {
 639                         set_key("DN", down);
 640                         set_joystick(-1, -1, -1, -1, -1);
 641                         break;
 642                 }
 643                 set_key("DN", 0);
 644                 set_joystick(-1, -1, -1, down, -1);
 645                 break;
 646         case SDLK_END:
 647                 set_joystick(-1, -1, -1, -1, down);
 648                 break;
 649
 650         case SDLK_a: set_key("A", down); break;
 651         case SDLK_b: set_key("B", down); break;
 652         case SDLK_c: set_key("C", down); break;
 653         case SDLK_d: set_key("D", down); break;
 654         case SDLK_e: set_key("E", down); break;
 655         case SDLK_f: set_key("F", down); break;
 656         case SDLK_g: set_key("G", down); break;
 657         case SDLK_h: set_key("H", down); break;
 658         case SDLK_i: set_key("I", down); break;
 659         case SDLK_j: set_key("J", down); break;
 660         case SDLK_k: set_key("K", down); break;
 661         case SDLK_l: set_key("L", down); break;
 662         case SDLK_m: set_key("M", down); break;
 663         case SDLK_n: set_key("N", down); break;
 664         case SDLK_o: set_key("O", down); break;
 665         case SDLK_p: set_key("P", down); break;
 666         case SDLK_q: set_key("Q", down); break;
 667         case SDLK_r: set_key("R", down); break;
 668         case SDLK_s: set_key("S", down); break;
 669         case SDLK_t: set_key("T", down); break;
 670         case SDLK_u: set_key("U", down); break;
 671         case SDLK_v: set_key("V", down); break;
 672         case SDLK_w: set_key("W", down); break;
 673         case SDLK_x: set_key("X", down); break;
 674         case SDLK_y: set_key("Y", down); break;
 675         case SDLK_z: set_key("Z", down); break;
 676
 677         case SDLK_0: set_key("0", down); break;
 678         case SDLK_1: set_key("1", down); break;
 679         case SDLK_2: set_key("2", down); break;
 680         case SDLK_3: set_key("3", down); break;
 681         case SDLK_4: set_key("4", down); break;
 682         case SDLK_5: set_key("5", down); break;
 683         case SDLK_6: set_key("6", down); break;
 684         case SDLK_7: set_key("7", down); break;
 685         case SDLK_8: set_key("8", down); break;
 686         case SDLK_9: set_key("9", down); break;
 687
 688         case SDLK_KP_0: set_key("NP0", down); break;
 689         case SDLK_KP_1: set_key("NP1", down); break;
 690         case SDLK_KP_2: set_key("NP2", down); break;
 691         case SDLK_KP_3: set_key("NP3", down); break;
 692         case SDLK_KP_4: set_key("NP4", down); break;
 693         case SDLK_KP_5: set_key("NP5", down); break;
 694         case SDLK_KP_6: set_key("NP6", down); break;
 695         case SDLK_KP_7: set_key("NP7", down); break;
 696         case SDLK_KP_8: set_key("NP8", down); break;
 697         case SDLK_KP_9: set_key("NP9", down); break;
 698         case SDLK_KP_DIVIDE: set_key("NPDIV", down); break;
 699         case SDLK_KP_MULTIPLY: set_key("NPMUL", down); break;
 700         case SDLK_KP_MINUS: set_key("NPSUB", down); break;
 701         case SDLK_KP_PLUS: set_key("NPADD", down); break;
 702         case SDLK_KP_PERIOD: set_key("NPDEL", down); break;
 703         // NPLPAREN and NPRPAREN are not emulated
 704
 705         case SDLK_F1: set_key("F1", down); break;
 706         case SDLK_F2: set_key("F2", down); break;
 707         case SDLK_F3: set_key("F3", down); break;
 708         case SDLK_F4: set_key("F4", down); break;
 709         case SDLK_F5: set_key("F5", down); break;
 710         case SDLK_F6: set_key("F6", down); break;
 711         case SDLK_F7: set_key("F7", down); break;
 712         case SDLK_F8: set_key("F8", down); break;
 713         case SDLK_F9: set_key("F9", down); break;
 714         case SDLK_F10: set_key("F10", down); break;
 715
 716         case SDLK_SPACE: set_key("SPC", down); break;
 717         case SDLK_BACKSPACE: set_key("BS", down); break;
 718         case SDLK_TAB: set_key("TAB", down); break;
 719         case SDLK_KP_ENTER: set_key("ENT", down); break;
 720         case SDLK_RETURN: set_key("RET", down); break;
 721         case SDLK_ESCAPE: set_key("ESC", down); break;
 722         case SDLK_DELETE: set_key("DEL", down); break;
 723         case SDLK_INSERT: set_key("HELP", down); break;
 724
 725         }
 726 }
 727
 728 void audio_sdl(float *data, int length)
 729 {
 730         int fill, s;
 731
 732         /* read sound from sound buffer
 733          * buffer pointer read and write is atomic, so no locking required!
 734          */
 735         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
 736         if (fill < length) {
 737 #ifdef DEBUG_SOUND_BUFFERING
 738                 fprintf(stderr, "sound buffer underrun\n");
 739 #endif
 740                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
 741                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
 742         }
 743         for (s = 0; s < length; s++) {
 744                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
 745                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
 746         }
 747 #ifdef DEBUG_SOUND_BUFFERING
 748         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
 749 #endif
 750         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
 751 }
 752
 753 int main(int argc, char *argv[])
 754 {
 755         int rc;
 756         int sdl_sound_chunk;
 757
 758         home_dir = getenv("HOME");
 759         if (!home_dir)
 760                 home_dir = "";
 761
 762         rc = parse_args(argc, argv);
 763         if (rc)
 764                 return 0;
 765
 766         /* allocate image */
 767         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
 768         if (!image) {
 769                 print_error("Failed to allocate image buffer\n");
 770                 goto done;
 771         }
 772
 773         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
 774                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
 775                 goto done;
 776         }
 777         if ((1000 % IRQ_RATE)) {
 778                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
 779                 goto done;
 780         }
 781
 782         /* calculate SDL chunk size for audio
 783          * it must be a power of two, but not more than the chunk size for each IRQ!
 784          */
 785         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
 786                 ;
 787         sdl_sound_chunk >>= 1;
 788 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
 789
 790         /* allocate sound buffers */
 791         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
 792         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
 793         if (!sound_buffer) {
 794                 print_error("Failed to allocate image buffer\n");
 795                 goto done;
 796         }
 797
 798         /* allocate memory */
 799         memory = calloc(MEMORY_SIZE, 1);
 800         if (!memory) {
 801                 print_error("Failed to allocate cpu's memory\n");
 802                 goto done;
 803         }
 804         stop_event = calloc(MEMORY_SIZE, 1);
 805         if (!stop_event) {
 806                 print_error("Failed to allocate cpu's stop_event memory\n");
 807                 goto done;
 808         }
 809         chipreg = calloc(IOSIZE, 1);
 810         if (!chipreg) {
 811                 print_error("Failed to allocate chip register\n");
 812                 goto done;
 813         }
 814
 815         /* init cpu code */
 816         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
 817
 818         /* init disk emulation */
 819         disk_init(disk_read, disk_write);
 820
 821         /* load binary */
 822         mercenary_load();
 823
 824         /* patch some stuff */
 825         mercenary_patch();
 826
 827         /* init SDL and OpenGL */
 828         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);
 829         if (rc < 0)
 830                 goto done;
 831         rc = init_opengl((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
 832         if (rc < 0)
 833                 goto done;
 834         resize_opengl((config_debug_opengl) ? SCREEN_WIDTH * 2 : SCREEN_WIDTH * 3, (config_debug_opengl) ? SCREEN_HEIGHT * 4 : SCREEN_HEIGHT * 3);
 835
 836         /* init audio filter */
 837         sound_init_filter(SOUND_SAMPLERATE);
 838
 839         /* start cpu */
 840         reset_cpu();
 841
 842         if (config_skip_intro) {
 843                 int event;
 844
 845                 print_info("*** Skipping intro, fast forwarding... ***\n\n");
 846                 do {
 847                         execute_cpu(0, &event);
 848                 } while (event != STOP_AT_CLEAR_SCREEN1);
 849                 do {
 850                         execute_cpu(0, &event);
 851                 } while (event != STOP_AT_WAIT_VBL);
 852         }
 853
 854         print_info("**********************************\n");
 855         print_info("* Welcome to Mercenary Reloaded! *\n");
 856         print_info("**********************************\n\n");
 857         print_info("Press CTRL + cursor keys to select inventory or pickup/drop item.\n");
 858         print_info("Press CTRL + f to toggle full screen.\n");
 859         print_info("Press CTRL + s to toggle rendering speed.\n");
 860         print_info("Press CTRL + v to toggle video filter.\n");
 861         print_info("Press CTRL + a to toggle audio filter.\n");
 862         print_info("Press CTRL + r to toggle rendering with opengl or orignal code.\n");
 863         print_info("Press CTRL + Keypad Plus to decrement FOV.\n");
 864         print_info("Press CTRL + Keypad Minus to increment FOV.\n");
 865         print_info("Press CTRL + c to exit game.\n\n");
 866         print_info("Use '--help' as command line option for configuration settings.\n\n");
 867
 868         /* run game */
 869         main_loop();
 870
 871 done:
 872         exit_opengl();
 873         exit_sdl();
 874
 875         if (chipreg)
 876                 free(chipreg);
 877         if (stop_event)
 878                 free(stop_event);
 879         if (memory)
 880                 free(memory);
 881         if (sound_buffer)
 882                 free(sound_buffer);
 883         if (image)
 884                 free(image);
 885
 886         return 0;
 887 }
 888