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 "../libtext/text.h"
  37 #include "mercenary.h"
  38 #include "render.h"
  39
  40 #define FOV_MIN         10.0
  41 #define FOV_NOVAGEN     64.0
  42 #define FOV_JOLLY       80.0
  43 #define FOV_MAX         170.0
  44
  45 static int config_ctrl_c = 0;
  46 static int config_amiga_speed = 1;
  47 #warning fixme: make use of 10 for intro, then be as fast as given
  48 static double config_fps = 16.0;
  49 static const char *config_gamesave_dir = ".mercenary";
  50 static int config_video_filter = 1;
  51 static int config_audio_filter = 1;
  52 static int config_render = 0;
  53 static int config_skip_intro = 0;
  54 static int config_multisampling = 16;
  55 static double config_fov = FOV_NOVAGEN;
  56 static double config_benson_size = 1.0;
  57 static int config_debug_transparent = 0;
  58 static int config_debug_opengl = 0;
  59 /* render improvements */
  60 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  61
  62 #define CPU_SPEED       7093790.0;
  63
  64 #define SOUND_SAMPLERATE 48000
  65 /* - game IRQ rate
  66  * - must be used for sound rendering chunk
  67  */
  68 #define IRQ_RATE        50
  69 /* numbe of buffer chunks to dejitter:
  70  * - SDL render interval
  71  * - sound rendering interval
  72  * - sound card interval
  73  * 4 should be minimum, if video rate is >=50 Hz
  74  */
  75 #define SOUND_CHUNKS    4
  76
  77 /* test sound to check if buffer does not overflow / underrun */
  78 //#define DEBUG_SOUND_BUFFERING
  79
  80 #define IOSIZE          0x1000 /* bytes in io space */
  81 #define MEMORY_SIZE     0x80000
  82 static uint8_t *memory = NULL;
  83 static uint8_t *stop_event = NULL;
  84 static uint8_t *image = NULL;
  85 static uint8_t *help_osd = NULL;
  86 static uint8_t *info_osd = NULL;
  87 static int help_view = 1;
  88 static int32_t osd_timer = 0;
  89 #define SCREEN_WIDTH    320
  90 #define SCREEN_HEIGHT   200
  91 #define IMAGE_WIDTH     320
  92 #define IMAGE_HEIGHT    200
  93 #define BENSON_AT_LINE  136
  94 #define IMAGE_DIWSTART  0x2c
  95 #define HELP_ALPHA      0xd0
  96 #define OSD_WIDTH       320
  97 #define OSD_HEIGHT      16
  98 static uint16_t *chipreg = NULL;
  99 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 100 static int sound_buffer_size; /* buffer sample size */
 101 static int sound_buffer_writep; /* write pointer at buffer */
 102 static int sound_buffer_readp; /* read pointer at buffer */
 103 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 104 static double benson_size; /* render size of benson */
 105 static int render_legacy = 0; /* render original amiga screen, if set */
 106 static int render_improved = 0; /* render improved image, if set */
 107 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 108
 109 static const char *home_dir;
 110
 111 static int quit = 0;
 112
 113 int parse_args(int argc, char *argv[])
 114 {
 115         int i = 1;
 116
 117         while (argc > i) {
 118                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 119                         print_info("Usage: %s\n", argv[0]);
 120                         print_info(" -s --render-speed original | fast\n");
 121                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 122                         print_info("    --fps <fps>\n");
 123                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 124                         print_info(" -v --video-filter on | off\n");
 125                         print_info("        Set video filter.\n");
 126                         print_info(" -a --audio-filter on | off\n");
 127                         print_info("        Set audio filter.\n");
 128                         print_info(" -r --render original | opengl\n");
 129                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 130                         print_info(" -b --benson normal | half\n");
 131                         print_info("        Size of 'Benson' (control panel).\n");
 132                         print_info(" -m --multisampling <samples>\n");
 133                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 134                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 135                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 136                         print_info(" -i --skip-intro\n");
 137                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 138                         print_info("Debug options:\n");
 139                         print_info(" -o --debug-opengl\n");
 140                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 141                         print_info("    --debug-transparent\n");
 142                         print_info("        Draw all things half transparent.\n");
 143                         print_info("    --ctrl-c\n");
 144                         print_info("        Use CTRL+C to exit game (used for development)\n");
 145                         return -1;
 146                 } else
 147                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 148                         i++;
 149                         if (argc == i) {
 150 missing_parameter:
 151                                 print_info("Missing parameter, use '--help'!\n");
 152                                 return -1;
 153                         }
 154                         if (!strcmp(argv[i], "original"))
 155                                 config_amiga_speed = 1;
 156                         else
 157                         if (!strcmp(argv[i], "fast"))
 158                                 config_amiga_speed = 0;
 159                         else {
 160 illegal_parameter:
 161                                 print_info("Illegal parameter, use '--help'!\n");
 162                                 return -1;
 163                         }
 164                 } else
 165                 if (!strcmp(argv[i], "--fps")) {
 166                         i++;
 167                         if (argc == i)
 168                                 goto missing_parameter;
 169                         config_fps = atof(argv[i]);
 170                         if (config_fov <= 0.0)
 171                                 goto illegal_parameter;
 172                 } else
 173                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 174                         i++;
 175                         if (argc == i)
 176                                 goto missing_parameter;
 177                         if (!strcmp(argv[i], "on"))
 178                                 config_video_filter = 1;
 179                         else
 180                         if (!strcmp(argv[i], "off"))
 181                                 config_video_filter = 0;
 182                         else
 183                                 goto illegal_parameter;
 184                 } else
 185                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 186                         i++;
 187                         if (argc == i)
 188                                 goto missing_parameter;
 189                         if (!strcmp(argv[i], "on"))
 190                                 config_audio_filter = 1;
 191                         else
 192                         if (!strcmp(argv[i], "off"))
 193                                 config_audio_filter = 0;
 194                         else
 195                                 goto illegal_parameter;
 196                 } else
 197                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 198                         i++;
 199                         if (argc == i)
 200                                 goto missing_parameter;
 201                         if (!strcmp(argv[i], "original"))
 202                                 config_render = 0;
 203                         else
 204                         if (!strcmp(argv[i], "opengl"))
 205                                 config_render = 1;
 206                         else
 207                                 goto illegal_parameter;
 208                 } else
 209                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 210                         i++;
 211                         if (argc == i)
 212                                 goto missing_parameter;
 213                         if (!strcmp(argv[i], "normal"))
 214                                 config_benson_size = 1.0;
 215                         else
 216                         if (!strcmp(argv[i], "half")) {
 217                                 config_benson_size = 0.5;
 218                                 if (config_fov == FOV_NOVAGEN)
 219                                         config_fov = FOV_JOLLY;
 220                         } else
 221                                 goto illegal_parameter;
 222                 } else
 223                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 224                         i++;
 225                         if (argc == i)
 226                                 goto missing_parameter;
 227                         config_multisampling = atoi(argv[i]);
 228                 } else
 229                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 230                         i++;
 231                         if (argc == i)
 232                                 goto missing_parameter;
 233                         config_fov = atof(argv[i]);
 234                         if (config_fov < 1.0 || config_fov > 179.0)
 235                                 goto illegal_parameter;
 236                 } else
 237                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 238                         config_skip_intro = 1;
 239                 } else
 240                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 241                         config_debug_opengl = 1;
 242                 } else
 243                 if (!strcmp(argv[i], "--debug-transparent")) {
 244                         config_debug_transparent = 1;
 245                 } else
 246                 if (!strcmp(argv[i], "--ctrl-c")) {
 247                         config_ctrl_c = 1;
 248                 } else {
 249                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 250                         return -1;
 251                 }
 252                 i++;
 253         }
 254
 255         return 0;
 256 }
 257
 258 static void special_event(int event)
 259 {
 260         if (render_improved)
 261                 render_capture_event(event);
 262 }
 263
 264 static void main_loop(void)
 265 {
 266         double frame_step, frame_time = 0.0, frame_render = 1;
 267         int had_first_irq = 0;
 268         static uint32_t current_time, last_time = 0, diff;
 269         int i, rc;
 270         int space, length;
 271         int cycle_count, event = STOP_AT_END;
 272         double render_delay = 0.0;
 273         uint32_t palette_address;
 274         uint16_t palette[16];
 275
 276         last_time = SDL_GetTicks();
 277
 278         /* render result on window */
 279         while (!quit) {
 280 #warning oder ganz anders: bevor landung machen wir amiga-rate als interpolation
 281                 /* if we are in interstellar fligt, we use 50 Hz */
 282                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 283                 /* else we use whatever frame rate the user wants */
 284                 if (render_capture_is_interstellar())
 285                         frame_step = vbl_duration * 50.0;
 286                 else
 287                         frame_step = vbl_duration * config_fps;
 288                 if (frame_step > 1.0)
 289                         frame_step = 1.0;
 290                 /* handle SDL events */
 291                 rc = event_sdl();
 292                 if (rc)
 293                         break;
 294
 295                 /* clear screen */
 296                 opengl_clear();
 297
 298                 /* initialize rendering */
 299                 debug_opengl = config_debug_opengl;
 300                 benson_size = config_benson_size;
 301                 render_legacy = (!config_render) || debug_opengl;
 302                 render_improved = config_render || debug_opengl;
 303                 if (!render_improved) {
 304                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 305                         render_capture_reset();
 306                 }
 307                 if (render_improved) {
 308                         opengl_viewport_improved(debug_opengl, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 309                         opengl_copy_last();
 310                 }
 311                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 312                 /* amgia speed: don't render if we still delay */
 313                 /* non amiga speed: render if we need a new frame */
 314                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 315                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 316                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 317                 if (((frame_render && !config_amiga_speed)
 318                   || (config_amiga_speed && render_delay <= 0.0)
 319                   || event == STOP_AT_WAIT_INPUT)
 320                 && !(had_first_irq && help_view)) {
 321                         frame_render = 0;
 322                         /* start capturing for improved graphics */
 323                         if (render_improved)
 324                                 render_capture_start(config_fov, config_improve_extend_roads, config_debug_transparent);
 325
 326                         /* execute until the rendered image is ready (wait for VBL) */
 327                         cycle_count = 0;
 328                         do {
 329                                 cycle_count += execute_cpu(0, &event);
 330                                 /* handle special events */
 331                                 special_event(event);
 332                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 333                         /* stop capturing for improved graphics */
 334                         if (render_improved)
 335                                 render_capture_stop();
 336                         /* copy palette */
 337                         palette_address = mercenary_palette_view();
 338                         for (i = 0; i < 16; i++)
 339                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 340                         /* for amiga speed: set delay by the number of cycles */
 341                         if (config_amiga_speed)
 342                                 render_delay += (double)cycle_count / CPU_SPEED;
 343                 }
 344                 /* render improved graphics, interpolate, if required */
 345                 if (render_improved)
 346                         render_all_items((config_amiga_speed) ? 1.0 : frame_time);
 347                 /* advance frame time, if we are not in help view  */
 348                 if (!(had_first_irq && help_view)) {
 349 //printf("frame rate: %.6f, frame-step=%.5f frame-time=%.5f\n", 1.0 / vbl_duration, frame_step,frame_time);
 350                         frame_time += frame_step;
 351                         if (frame_time >= 1.0) {
 352                                 frame_time -= 1.0;
 353                                 frame_render = 1;
 354                         }
 355                 }
 356
 357                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 358                 if (had_first_irq) {
 359                         /* render game view without benson
 360                          * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 361                          */
 362                         if (render_legacy)
 363                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 364                 }
 365                 /* render benson + osd ontop of improved opengl rendering, if enabled */
 366                 if (render_improved) {
 367                         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);
 368                         if (help_view)
 369                                 opengl_blit_osd(0, help_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size, 1.0, 1.0, 0.0, 0.0);
 370                         if (osd_timer) {
 371                                 opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size, 0.5, 0.04, 0.5, -0.95);
 372                                 if (osd_timer - (int32_t)SDL_GetTicks() < 0)
 373                                         osd_timer = 0;
 374                         }
 375                 }
 376                 /* setup viewport for legacy image and render image, if enabled */
 377                 if (render_legacy) {
 378                         opengl_viewport_legacy(debug_opengl);
 379                         opengl_blit_legacy(image, config_video_filter);
 380                         if (help_view)
 381                                 opengl_blit_osd(0, help_osd, config_video_filter, 0, 0.0, 0, 1.0, 1.0, 0.0, 0.0);
 382                         if (osd_timer) {
 383                                 opengl_blit_osd(1, info_osd, config_video_filter, 0, 0.0, 0, 0.5, 0.04, 0.5, -0.95);
 384                                 if (osd_timer - (int32_t)SDL_GetTicks() < 0)
 385                                         osd_timer = 0;
 386                         }
 387                 }
 388
 389                 /* at this point we are ready with our image, so we display */
 390                 swap_sdl();
 391                 /* measure frame rate */
 392                 framerate_measure();
 393
 394                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 395                 /* only do this, if we are not in help view */
 396                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 397                 if (!(had_first_irq && help_view)) {
 398                         current_time = SDL_GetTicks();
 399                         diff = current_time - last_time;
 400                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 401                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 402                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 403                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 404                         }
 405                         while (diff > 1000 / IRQ_RATE) {
 406                                 execute_cpu(3, NULL);
 407                                 execute_cpu(4, NULL);
 408                                 had_first_irq = 1;
 409                                 /* transfer benson without game view
 410                                  * because we only got benson refreshed during VBL IRQ
 411                                  */
 412                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 413                                 /* render sound to sound buffer
 414                                  * buffer pointer read and write is atomic, so no locking required!
 415                                  */
 416                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 417                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 418 #ifdef DEBUG_SOUND_BUFFERING
 419                                         fprintf(stderr, "sound buffer overflow\n");
 420 #endif
 421                                         length = space;
 422                                 } else
 423                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 424 #ifdef DEBUG_SOUND_BUFFERING
 425                                 printf("can write %d, write %d\n", space, length);
 426                                 static int cnt = 0;
 427                                 int s;
 428                                 for (s = 0; s < length; s++) {
 429                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 430                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 431                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 432                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 433                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 434                                          cnt++;
 435                                 }
 436 #else
 437                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 438 #endif
 439                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 440                                 diff -= 1000 / IRQ_RATE;
 441                                 last_time += 1000 / IRQ_RATE;
 442
 443                                 /* count down render delay */
 444                                 if (render_delay) {
 445                                         render_delay -= 1.0 / (double)IRQ_RATE;
 446                                         if (render_delay < 0.0)
 447                                                 render_delay = 0.0;
 448                                 }
 449                         }
 450                 }
 451         }
 452 }
 453
 454 static uint16_t io_read(uint32_t address)
 455 {
 456         uint16_t value = 0xffff;
 457
 458         /* joystick and fire button */
 459         if (address == 0xbfe000 || address == 0xdff00c)
 460                 value &= emulate_joystick_read(address);
 461         /* keyboard */
 462         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 463                 value &= emulate_keyboard_read(address);
 464         /* diskette */
 465         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 466                 value &= emulate_disk_read(address);
 467
 468         return value;
 469 }
 470
 471 static void io_write(uint32_t address, uint16_t value)
 472 {
 473         /* dmacon and sound registers */
 474         if (address == 0xdff096 || (address >= 0xdff0a0 && address <= 0xdff0df))
 475                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 476         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 477                 emulate_disk_write(address, value);
 478 }
 479
 480 /* two tracks with 0x1820 words of length */
 481 static uint8_t game_save[2][0x1820 << 1];
 482 static int last_track = 0;
 483
 484 /* game reads track with saved game */
 485 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 486 {
 487         if (length > sizeof(game_save[0])) {
 488                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 489                 return;
 490         }
 491
 492         /* if even track is selected, load game */
 493         if (!(track & 1)) {
 494                 char filename[256];
 495                 int gamesave_num = (track - 2) >> 1;
 496                 int got;
 497                 FILE *fp;
 498
 499                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 500 #if defined(_WIN32)
 501                 filename[0] = '\0';
 502 #else
 503                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 504                 mkdir(filename, 0777);
 505 #endif
 506                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 507                 fp = fopen(filename, "r");
 508                 if (!fp) {
 509 fail:
 510                         print_error("failed to load game from '%s'\n", filename);
 511                         goto copy;
 512                 }
 513                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 514                 fclose(fp);
 515                 if (got != 2)
 516                         goto fail;
 517         }
 518
 519 copy:
 520         /* copy track */
 521         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 522 }
 523
 524 /* game writes track with saved game */
 525 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 526 {
 527         /* skip sync info that is provided by game and only relevant for a real disk track */
 528         data += 0x200;
 529         length -= 0x200;
 530
 531         if (length != sizeof(game_save[0])) {
 532                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 533                 return;
 534         }
 535
 536         /* don't save if last track is the same, because disk is written on both sides with the same data */
 537         if (track == last_track) {
 538                 if (memcmp(memory + data, game_save[track & 1], length)) {
 539                         print_error("saving game data on other side of the disk is different, please fix!\n");
 540                 }
 541                 return;
 542         }
 543         last_track = track;
 544
 545         /* save game data */
 546         memcpy(game_save[track & 1], memory + data, length);
 547
 548         /* if done with saving */
 549         if ((track & 1)) {
 550                 char filename[256];
 551                 int gamesave_num = (track - 2) >> 1;
 552                 int wrote;
 553                 FILE *fp;
 554
 555 #if defined(_WIN32)
 556                 filename[0] = '\0';
 557 #else
 558                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 559                 mkdir(filename, 0777);
 560 #endif
 561                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 562                 fp = fopen(filename, "w");
 563                 if (!fp) {
 564 fail:
 565                         print_error("failed to save game to '%s'\n", filename);
 566                         return;
 567                 }
 568                 print_info("Game state saved to '%s'\n", filename);
 569                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 570                 fclose(fp);
 571                 if (wrote != 2)
 572                         goto fail;
 573         }
 574 }
 575
 576 static void osd_info(const char *param, const char *value)
 577 {
 578         char line[41] = "                                        ";
 579
 580         if (param[0]) {
 581                 strncpy(line + 21 - strlen(param), param, strlen(param));
 582                 line[22] = ':';
 583         }
 584         if (strlen(value) > 15) {
 585                 print_error("string too long\n");
 586                 return;
 587         }
 588         strncpy(line + 25, value, strlen(value));
 589         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 590         osd_timer = SDL_GetTicks() + 2500;
 591 }
 592
 593 static int shift = 0, ctrl = 0;
 594
 595 static void keyboard_sdl(int down, SDL_Keycode sym)
 596 {
 597         switch (sym) {
 598         case SDLK_LCTRL:
 599         case SDLK_RCTRL:
 600                 ctrl = down;
 601                 break;
 602         }
 603
 604         if (ctrl && down) {
 605                 switch (sym) {
 606                 case SDLK_h:
 607                         help_view ^= 1;
 608                         break;
 609                 case SDLK_v:
 610                         config_video_filter ^= 1;
 611                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 612                         break;
 613                 case SDLK_a:
 614                         config_audio_filter ^= 1;
 615                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 616                         break;
 617                 case SDLK_s:
 618                         config_amiga_speed ^= 1;
 619                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 620                         break;
 621                 case SDLK_r:
 622                         config_render ^= 1;
 623                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 624                         break;
 625                 case SDLK_b:
 626                         if (!config_render) {
 627                                 osd_info("", "not applicable");
 628                                 break;
 629                         }
 630                         if (config_benson_size == 0.5) {
 631                                 config_benson_size = 1.0;
 632                                 config_fov = FOV_NOVAGEN;
 633                         } else {
 634                                 config_benson_size = 0.5;
 635                                 config_fov = FOV_JOLLY;
 636                         }
 637                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 638                         break;
 639                 case SDLK_c:
 640                         if (config_ctrl_c)
 641                                 quit = 1;
 642                         break;
 643                 case SDLK_KP_PLUS:
 644                         if (config_fov / 1.2 >= FOV_MIN)
 645                                 config_fov /= 1.2;
 646                         disp_fov:
 647                         {
 648                                 char text[16];
 649                                 sprintf(text, "%.2f", config_fov);
 650                                 osd_info("FOV", text);
 651                         }
 652                         break;
 653                 case SDLK_KP_MINUS:
 654                         if (config_fov * 1.2 <= FOV_MAX)
 655                                 config_fov *= 1.2;
 656                         goto disp_fov;
 657                 }
 658                 /* do not pass keys to game while holding CTRL */
 659                 return;
 660         }
 661
 662         if (sym == SDLK_PAUSE && down)
 663                 help_view ^= 1;
 664
 665         /* in help view we don't need to forward keypresses */
 666         if (help_view)
 667                 return;
 668
 669         switch (sym) {
 670         case SDLK_LSHIFT:
 671                 set_key("LSH", down);
 672                 shift = down;
 673                 break;
 674         case SDLK_RSHIFT:
 675                 set_key("RSH", down);
 676                 shift = down;
 677                 break;
 678         case SDLK_LEFT:
 679                 if (shift && down) {
 680                         set_key("LF", down);
 681                         set_joystick(-1, -1, -1, -1, -1);
 682                         break;
 683                 }
 684                 set_key("LF", 0);
 685                 set_joystick(down, -1, -1, -1, -1);
 686                 break;
 687         case SDLK_RIGHT:
 688                 if (shift && down) {
 689                         set_key("RT", down);
 690                         set_joystick(-1, -1, -1, -1, -1);
 691                         break;
 692                 }
 693                 set_key("RT", 0);
 694                 set_joystick(-1, down, -1, -1, -1);
 695                 break;
 696         case SDLK_UP:
 697                 if (shift && down) {
 698                         set_key("UP", down);
 699                         set_joystick(-1, -1, -1, -1, -1);
 700                         break;
 701                 }
 702                 set_key("UP", 0);
 703                 set_joystick(-1, -1, down, -1, -1);
 704                 break;
 705         case SDLK_DOWN:
 706                 if (shift && down) {
 707                         set_key("DN", down);
 708                         set_joystick(-1, -1, -1, -1, -1);
 709                         break;
 710                 }
 711                 set_key("DN", 0);
 712                 set_joystick(-1, -1, -1, down, -1);
 713                 break;
 714         case SDLK_END:
 715                 set_joystick(-1, -1, -1, -1, down);
 716                 break;
 717
 718         case SDLK_a: set_key("A", down); break;
 719         case SDLK_b: set_key("B", down); break;
 720         case SDLK_c: set_key("C", down); break;
 721         case SDLK_d: set_key("D", down); break;
 722         case SDLK_e: set_key("E", down); break;
 723         case SDLK_f: set_key("F", down); break;
 724         case SDLK_g: set_key("G", down); break;
 725         case SDLK_h: set_key("H", down); break;
 726         case SDLK_i: set_key("I", down); break;
 727         case SDLK_j: set_key("J", down); break;
 728         case SDLK_k: set_key("K", down); break;
 729         case SDLK_l: set_key("L", down); break;
 730         case SDLK_m: set_key("M", down); break;
 731         case SDLK_n: set_key("N", down); break;
 732         case SDLK_o: set_key("O", down); break;
 733         case SDLK_p: set_key("P", down); break;
 734         case SDLK_q: set_key("Q", down); break;
 735         case SDLK_r: set_key("R", down); break;
 736         case SDLK_s: set_key("S", down); break;
 737         case SDLK_t: set_key("T", down); break;
 738         case SDLK_u: set_key("U", down); break;
 739         case SDLK_v: set_key("V", down); break;
 740         case SDLK_w: set_key("W", down); break;
 741         case SDLK_x: set_key("X", down); break;
 742         case SDLK_y: set_key("Y", down); break;
 743         case SDLK_z: set_key("Z", down); break;
 744
 745         case SDLK_0: set_key("0", down); break;
 746         case SDLK_1: set_key("1", down); break;
 747         case SDLK_2: set_key("2", down); break;
 748         case SDLK_3: set_key("3", down); break;
 749         case SDLK_4: set_key("4", down); break;
 750         case SDLK_5: set_key("5", down); break;
 751         case SDLK_6: set_key("6", down); break;
 752         case SDLK_7: set_key("7", down); break;
 753         case SDLK_8: set_key("8", down); break;
 754         case SDLK_9: set_key("9", down); break;
 755
 756         case SDLK_KP_0: set_key("NP0", down); break;
 757         case SDLK_KP_1: set_key("NP1", down); break;
 758         case SDLK_KP_2: set_key("NP2", down); break;
 759         case SDLK_KP_3: set_key("NP3", down); break;
 760         case SDLK_KP_4: set_key("NP4", down); break;
 761         case SDLK_KP_5: set_key("NP5", down); break;
 762         case SDLK_KP_6: set_key("NP6", down); break;
 763         case SDLK_KP_7: set_key("NP7", down); break;
 764         case SDLK_KP_8: set_key("NP8", down); break;
 765         case SDLK_KP_9: set_key("NP9", down); break;
 766         case SDLK_KP_DIVIDE: set_key("NPDIV", down); break;
 767         case SDLK_KP_MULTIPLY: set_key("NPMUL", down); break;
 768         case SDLK_KP_MINUS: set_key("NPSUB", down); break;
 769         case SDLK_KP_PLUS: set_key("NPADD", down); break;
 770         case SDLK_KP_PERIOD: set_key("NPDEL", down); break;
 771         // NPLPAREN and NPRPAREN are not emulated
 772
 773         case SDLK_F1: set_key("F1", down); break;
 774         case SDLK_F2: set_key("F2", down); break;
 775         case SDLK_F3: set_key("F3", down); break;
 776         case SDLK_F4: set_key("F4", down); break;
 777         case SDLK_F5: set_key("F5", down); break;
 778         case SDLK_F6: set_key("F6", down); break;
 779         case SDLK_F7: set_key("F7", down); break;
 780         case SDLK_F8: set_key("F8", down); break;
 781         case SDLK_F9: set_key("F9", down); break;
 782         case SDLK_F10: set_key("F10", down); break;
 783
 784         case SDLK_SPACE: set_key("SPC", down); break;
 785         case SDLK_BACKSPACE: set_key("BS", down); break;
 786         case SDLK_TAB: set_key("TAB", down); break;
 787         case SDLK_KP_ENTER: set_key("ENT", down); break;
 788         case SDLK_RETURN: set_key("RET", down); break;
 789         case SDLK_ESCAPE: set_key("ESC", down); break;
 790         case SDLK_DELETE: set_key("DEL", down); break;
 791         case SDLK_INSERT: set_key("HELP", down); break;
 792
 793         }
 794 }
 795
 796 void audio_sdl(float *data, int length)
 797 {
 798         int fill, s;
 799
 800         /* read sound from sound buffer
 801          * buffer pointer read and write is atomic, so no locking required!
 802          */
 803         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
 804         if (fill < length) {
 805 #ifdef DEBUG_SOUND_BUFFERING
 806                 fprintf(stderr, "sound buffer underrun\n");
 807 #endif
 808                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
 809                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
 810         }
 811         for (s = 0; s < length; s++) {
 812                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
 813                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
 814         }
 815 #ifdef DEBUG_SOUND_BUFFERING
 816         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
 817 #endif
 818         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
 819 }
 820
 821 int main(int argc, char *argv[])
 822 {
 823         int rc;
 824         int sdl_sound_chunk;
 825
 826         home_dir = getenv("HOME");
 827         if (!home_dir)
 828                 home_dir = "";
 829
 830         rc = parse_args(argc, argv);
 831         if (rc)
 832                 return 0;
 833
 834         /* allocate image */
 835         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
 836         if (!image) {
 837                 print_error("Failed to allocate image buffer\n");
 838                 goto done;
 839         }
 840
 841         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
 842                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
 843                 goto done;
 844         }
 845         if ((1000 % IRQ_RATE)) {
 846                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
 847                 goto done;
 848         }
 849
 850         /* calculate SDL chunk size for audio
 851          * it must be a power of two, but not more than the chunk size for each IRQ!
 852          */
 853         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
 854                 ;
 855         sdl_sound_chunk >>= 1;
 856 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
 857
 858         /* allocate sound buffers */
 859         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
 860         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
 861         if (!sound_buffer) {
 862                 print_error("Failed to allocate image buffer\n");
 863                 goto done;
 864         }
 865
 866         /* allocate memory */
 867         memory = calloc(MEMORY_SIZE, 1);
 868         if (!memory) {
 869                 print_error("Failed to allocate cpu's memory\n");
 870                 goto done;
 871         }
 872         stop_event = calloc(MEMORY_SIZE, 1);
 873         if (!stop_event) {
 874                 print_error("Failed to allocate cpu's stop_event memory\n");
 875                 goto done;
 876         }
 877         chipreg = calloc(IOSIZE, 1);
 878         if (!chipreg) {
 879                 print_error("Failed to allocate chip register\n");
 880                 goto done;
 881         }
 882
 883         /* init cpu code */
 884         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
 885
 886         /* init disk emulation */
 887         disk_init(disk_read, disk_write);
 888
 889         /* load binary */
 890         mercenary_load();
 891
 892         /* patch some stuff */
 893         mercenary_patch();
 894
 895         /* init SDL and OpenGL */
 896         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);
 897         if (rc < 0)
 898                 goto done;
 899         rc = init_opengl((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
 900         if (rc < 0)
 901                 goto done;
 902         resize_opengl((config_debug_opengl) ? SCREEN_WIDTH * 2 : SCREEN_WIDTH * 3, (config_debug_opengl) ? SCREEN_HEIGHT * 4 : SCREEN_HEIGHT * 3);
 903
 904         /* init osd */
 905         rc = init_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
 906         if (rc < 0)
 907                 goto done;
 908         rc = init_osd(1, OSD_WIDTH, OSD_HEIGHT);
 909         if (rc < 0)
 910                 goto done;
 911         help_osd = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
 912         if (!help_osd)
 913                 goto done;
 914         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
 915         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
 916                 "Emulation:\n"
 917                 "        Press `PAUSE' to toggle this help screen on or off.\n"
 918                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
 919                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
 920                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
 921                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
 922                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
 923                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
 924                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
 925                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
 926                 "\n"
 927                 "Answer to a Question:\n"
 928                 "        Press `O' (not Zero) for OK and other key for NO.\n"
 929                 "\n"
 930                 "Walking / Driving / Flying:\n"
 931                 "        Use cursor keys as joystick, to move player / craft.\n"
 932                 "        Press `R' for running, 'W' for walking speed.\n"
 933                 "        Press `B' to board, `L' to leave.\n"
 934                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
 935                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
 936                 "        Press `SPACE' to stop craft.\n"
 937                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
 938                 "        Press `T' for turbo on certain craft.\n"
 939                 "        Press `END' as joystick's fire button.\n"
 940                 "\n"
 941                 "Elevator:\n"
 942                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
 943                 "\n"
 944                 "Inside a transporter:\n"
 945                 "        Press `1'...`0' to select destination.\n"
 946                 "\n"
 947                 "Items:\n"
 948                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
 949                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
 950                 "        Press `NUMPAD Enter' to select certain items.\n"
 951                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
 952                 "        Press `NUMPAD *' to read entry\n"
 953                 "Saving / Loading / Pause:\n"
 954                 "        Press `INSERT' to loading and saving options.\n"
 955                 "        Press `ENTER' to pause game, other key to continue.\n"
 956                 ,HELP_ALPHA, 1, 2, 5, 0);
 957         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
 958         if (!info_osd)
 959                 goto done;
 960
 961         /* init audio filter */
 962         sound_init_filter(SOUND_SAMPLERATE);
 963
 964         /* start cpu */
 965         reset_cpu();
 966
 967         if (config_skip_intro) {
 968                 int event;
 969
 970                 print_info("*** Skipping intro, fast forwarding... ***\n\n");
 971                 do {
 972                         execute_cpu(0, &event);
 973                 } while (event != STOP_AT_CLEAR_SCREEN1);
 974                 do {
 975                         execute_cpu(0, &event);
 976                 } while (event != STOP_AT_WAIT_VBL);
 977         }
 978
 979         /* run game */
 980         main_loop();
 981
 982 done:
 983         exit_opengl();
 984         exit_sdl();
 985
 986         if (chipreg)
 987                 free(chipreg);
 988         if (stop_event)
 989                 free(stop_event);
 990         if (memory)
 991                 free(memory);
 992         if (sound_buffer)
 993                 free(sound_buffer);
 994         if (image)
 995                 free(image);
 996         if (help_osd)
 997                 free(help_osd);
 998         if (info_osd)
 999                 free(info_osd);
1000
1001         return 0;
1002 }
1003