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 static int intro_skipped = 0; /* indicated if we already have landed */
 109
 110 static const char *home_dir;
 111
 112 static int quit = 0;
 113
 114 int parse_args(int argc, char *argv[])
 115 {
 116         int i = 1;
 117
 118         while (argc > i) {
 119                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 120                         print_info("Usage: %s\n", argv[0]);
 121                         print_info(" -s --render-speed original | fast\n");
 122                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 123                         print_info("    --fps <fps>\n");
 124                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 125                         print_info(" -v --video-filter on | off\n");
 126                         print_info("        Set video filter.\n");
 127                         print_info(" -a --audio-filter on | off\n");
 128                         print_info("        Set audio filter.\n");
 129                         print_info(" -r --render original | opengl\n");
 130                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 131                         print_info(" -b --benson normal | half\n");
 132                         print_info("        Size of 'Benson' (control panel).\n");
 133                         print_info(" -m --multisampling <samples>\n");
 134                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 135                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 136                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 137                         print_info(" -i --skip-intro\n");
 138                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 139                         print_info("Debug options:\n");
 140                         print_info(" -o --debug-opengl\n");
 141                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 142                         print_info("    --debug-transparent\n");
 143                         print_info("        Draw all things half transparent.\n");
 144                         print_info("    --ctrl-c\n");
 145                         print_info("        Use CTRL+C to exit game (used for development)\n");
 146                         return -1;
 147                 } else
 148                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 149                         i++;
 150                         if (argc == i) {
 151 missing_parameter:
 152                                 print_info("Missing parameter, use '--help'!\n");
 153                                 return -1;
 154                         }
 155                         if (!strcmp(argv[i], "original"))
 156                                 config_amiga_speed = 1;
 157                         else
 158                         if (!strcmp(argv[i], "fast"))
 159                                 config_amiga_speed = 0;
 160                         else {
 161 illegal_parameter:
 162                                 print_info("Illegal parameter, use '--help'!\n");
 163                                 return -1;
 164                         }
 165                 } else
 166                 if (!strcmp(argv[i], "--fps")) {
 167                         i++;
 168                         if (argc == i)
 169                                 goto missing_parameter;
 170                         config_fps = atof(argv[i]);
 171                         if (config_fov <= 0.0)
 172                                 goto illegal_parameter;
 173                 } else
 174                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 175                         i++;
 176                         if (argc == i)
 177                                 goto missing_parameter;
 178                         if (!strcmp(argv[i], "on"))
 179                                 config_video_filter = 1;
 180                         else
 181                         if (!strcmp(argv[i], "off"))
 182                                 config_video_filter = 0;
 183                         else
 184                                 goto illegal_parameter;
 185                 } else
 186                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 187                         i++;
 188                         if (argc == i)
 189                                 goto missing_parameter;
 190                         if (!strcmp(argv[i], "on"))
 191                                 config_audio_filter = 1;
 192                         else
 193                         if (!strcmp(argv[i], "off"))
 194                                 config_audio_filter = 0;
 195                         else
 196                                 goto illegal_parameter;
 197                 } else
 198                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 199                         i++;
 200                         if (argc == i)
 201                                 goto missing_parameter;
 202                         if (!strcmp(argv[i], "original"))
 203                                 config_render = 0;
 204                         else
 205                         if (!strcmp(argv[i], "opengl"))
 206                                 config_render = 1;
 207                         else
 208                                 goto illegal_parameter;
 209                 } else
 210                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 211                         i++;
 212                         if (argc == i)
 213                                 goto missing_parameter;
 214                         if (!strcmp(argv[i], "normal"))
 215                                 config_benson_size = 1.0;
 216                         else
 217                         if (!strcmp(argv[i], "half")) {
 218                                 config_benson_size = 0.5;
 219                                 if (config_fov == FOV_NOVAGEN)
 220                                         config_fov = FOV_JOLLY;
 221                         } else
 222                                 goto illegal_parameter;
 223                 } else
 224                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 225                         i++;
 226                         if (argc == i)
 227                                 goto missing_parameter;
 228                         config_multisampling = atoi(argv[i]);
 229                 } else
 230                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 231                         i++;
 232                         if (argc == i)
 233                                 goto missing_parameter;
 234                         config_fov = atof(argv[i]);
 235                         if (config_fov < 1.0 || config_fov > 179.0)
 236                                 goto illegal_parameter;
 237                 } else
 238                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 239                         config_skip_intro = 1;
 240                 } else
 241                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 242                         config_debug_opengl = 1;
 243                 } else
 244                 if (!strcmp(argv[i], "--debug-transparent")) {
 245                         config_debug_transparent = 1;
 246                 } else
 247                 if (!strcmp(argv[i], "--ctrl-c")) {
 248                         config_ctrl_c = 1;
 249                 } else {
 250                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 251                         return -1;
 252                 }
 253                 i++;
 254         }
 255
 256         return 0;
 257 }
 258
 259 static void skip_intro(void)
 260 {
 261         int event;
 262         double render_delay = 0.0;
 263         double cycle_count;
 264
 265         if (intro_skipped)
 266                 return;
 267
 268         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 269         do {
 270                 /* render, if not delayed */
 271                 if (render_delay <= 0.0) {
 272                         cycle_count = 0;
 273                         do {
 274                                 cycle_count += execute_cpu(0, &event);
 275                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 276                         render_delay += (double)cycle_count / CPU_SPEED;
 277                 }
 278                 /* VBL */
 279                 execute_cpu(3, NULL);
 280                 execute_cpu(4, NULL);
 281                 /* count down render delay */
 282                 if (render_delay) {
 283                         render_delay -= 1.0 / (double)IRQ_RATE;
 284                         if (render_delay < 0.0)
 285                                 render_delay = 0.0;
 286                 }
 287         } while (event != STOP_AT_CLEAR_SCREEN1);
 288
 289         intro_skipped = 1;
 290 }
 291
 292 static void special_event(int event)
 293 {
 294         if (render_improved)
 295                 render_capture_event(event);
 296 }
 297
 298 static void main_loop(void)
 299 {
 300         double frame_step, frame_time = 0.0, frame_render = 1;
 301         int had_first_irq = 0;
 302         static uint32_t current_time, last_time = 0, diff;
 303         int i, rc;
 304         int space, length;
 305         int cycle_count, event = STOP_AT_END;
 306         double render_delay = 0.0;
 307         uint32_t palette_address;
 308         uint16_t palette[16];
 309
 310         last_time = SDL_GetTicks();
 311
 312         /* render result on window */
 313         while (!quit) {
 314 #warning oder ganz anders: bevor landung machen wir amiga-rate als interpolation
 315                 /* if we are in interstellar fligt, we use 50 Hz */
 316                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 317                 /* else we use whatever frame rate the user wants */
 318                 if (render_capture_is_interstellar())
 319                         frame_step = vbl_duration * 50.0;
 320                 else
 321                         frame_step = vbl_duration * config_fps;
 322                 if (frame_step > 1.0)
 323                         frame_step = 1.0;
 324                 /* handle SDL events */
 325                 rc = event_sdl();
 326                 if (rc)
 327                         break;
 328
 329                 /* clear screen */
 330                 opengl_clear();
 331
 332                 /* initialize rendering */
 333                 debug_opengl = config_debug_opengl;
 334                 benson_size = config_benson_size;
 335                 render_legacy = (!config_render) || debug_opengl;
 336                 render_improved = config_render || debug_opengl;
 337                 if (!render_improved) {
 338                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 339                         render_capture_reset();
 340                 }
 341                 if (render_improved) {
 342                         opengl_viewport_improved(debug_opengl, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 343                         opengl_copy_last();
 344                 }
 345                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 346                 /* amgia speed: don't render if we still delay */
 347                 /* non amiga speed: render if we need a new frame */
 348                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 349                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 350                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 351                 if (((frame_render && !config_amiga_speed)
 352                   || (config_amiga_speed && render_delay <= 0.0)
 353                   || event == STOP_AT_WAIT_INPUT)
 354                 && !(had_first_irq && help_view)) {
 355                         frame_render = 0;
 356                         /* start capturing for improved graphics */
 357                         if (render_improved)
 358                                 render_capture_start(config_fov, config_improve_extend_roads, config_debug_transparent);
 359
 360                         /* execute until the rendered image is ready (wait for VBL) */
 361                         cycle_count = 0;
 362                         do {
 363                                 cycle_count += execute_cpu(0, &event);
 364                                 /* handle special events */
 365                                 special_event(event);
 366                                 if (event == STOP_AT_CLEAR_SCREEN1)
 367                                         intro_skipped = 1;
 368                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 369                         /* stop capturing for improved graphics */
 370                         if (render_improved)
 371                                 render_capture_stop();
 372                         /* copy palette */
 373                         palette_address = mercenary_palette_view();
 374                         for (i = 0; i < 16; i++)
 375                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 376                         /* for amiga speed: set delay by the number of cycles */
 377                         if (config_amiga_speed)
 378                                 render_delay += (double)cycle_count / CPU_SPEED;
 379                 }
 380                 /* render improved graphics, interpolate, if required */
 381                 if (render_improved)
 382                         render_all_items((config_amiga_speed) ? 1.0 : frame_time);
 383                 /* advance frame time, if we are not in help view  */
 384                 if (!(had_first_irq && help_view)) {
 385 //printf("frame rate: %.6f, frame-step=%.5f frame-time=%.5f\n", 1.0 / vbl_duration, frame_step,frame_time);
 386                         frame_time += frame_step;
 387                         if (frame_time >= 1.0) {
 388                                 frame_time -= 1.0;
 389                                 frame_render = 1;
 390                         }
 391                 }
 392
 393                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 394                 if (had_first_irq) {
 395                         /* render game view without benson
 396                          * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 397                          */
 398                         if (render_legacy)
 399                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 400                 }
 401                 /* render benson + osd ontop of improved opengl rendering, if enabled */
 402                 if (render_improved) {
 403                         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);
 404                         if (help_view)
 405                                 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);
 406                         if (osd_timer) {
 407                                 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);
 408                                 if (osd_timer - (int32_t)SDL_GetTicks() < 0)
 409                                         osd_timer = 0;
 410                         }
 411                 }
 412                 /* setup viewport for legacy image and render image, if enabled */
 413                 if (render_legacy) {
 414                         opengl_viewport_legacy(debug_opengl);
 415                         opengl_blit_legacy(image, config_video_filter);
 416                         if (help_view)
 417                                 opengl_blit_osd(0, help_osd, config_video_filter, 0, 0.0, 0, 1.0, 1.0, 0.0, 0.0);
 418                         if (osd_timer) {
 419                                 opengl_blit_osd(1, info_osd, config_video_filter, 0, 0.0, 0, 0.5, 0.04, 0.5, -0.95);
 420                                 if (osd_timer - (int32_t)SDL_GetTicks() < 0)
 421                                         osd_timer = 0;
 422                         }
 423                 }
 424
 425                 /* at this point we are ready with our image, so we display */
 426                 swap_sdl();
 427                 /* measure frame rate */
 428                 framerate_measure();
 429
 430                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 431                 /* only do this, if we are not in help view */
 432                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 433                 if (!(had_first_irq && help_view)) {
 434                         current_time = SDL_GetTicks();
 435                         diff = current_time - last_time;
 436                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 437                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 438                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 439                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 440                         }
 441                         while (diff > 1000 / IRQ_RATE) {
 442                                 execute_cpu(3, NULL);
 443                                 execute_cpu(4, NULL);
 444                                 had_first_irq = 1;
 445                                 /* transfer benson without game view
 446                                  * because we only got benson refreshed during VBL IRQ
 447                                  */
 448                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 449                                 /* render sound to sound buffer
 450                                  * buffer pointer read and write is atomic, so no locking required!
 451                                  */
 452                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 453                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 454 #ifdef DEBUG_SOUND_BUFFERING
 455                                         fprintf(stderr, "sound buffer overflow\n");
 456 #endif
 457                                         length = space;
 458                                 } else
 459                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 460 #ifdef DEBUG_SOUND_BUFFERING
 461                                 printf("can write %d, write %d\n", space, length);
 462                                 static int cnt = 0;
 463                                 int s;
 464                                 for (s = 0; s < length; s++) {
 465                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 466                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 467                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 468                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 469                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 470                                          cnt++;
 471                                 }
 472 #else
 473                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 474 #endif
 475                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 476                                 diff -= 1000 / IRQ_RATE;
 477                                 last_time += 1000 / IRQ_RATE;
 478
 479                                 /* count down render delay */
 480                                 if (render_delay) {
 481                                         render_delay -= 1.0 / (double)IRQ_RATE;
 482                                         if (render_delay < 0.0)
 483                                                 render_delay = 0.0;
 484                                 }
 485                         }
 486                 }
 487         }
 488 }
 489
 490 static uint16_t io_read(uint32_t address)
 491 {
 492         uint16_t value = 0xffff;
 493
 494         /* joystick and fire button */
 495         if (address == 0xbfe000 || address == 0xdff00c)
 496                 value &= emulate_joystick_read(address);
 497         /* keyboard */
 498         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 499                 value &= emulate_keyboard_read(address);
 500         /* diskette */
 501         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 502                 value &= emulate_disk_read(address);
 503
 504         return value;
 505 }
 506
 507 static void io_write(uint32_t address, uint16_t value)
 508 {
 509         /* dmacon and sound registers */
 510         if (address == 0xdff096 || (address >= 0xdff0a0 && address <= 0xdff0df))
 511                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 512         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 513                 emulate_disk_write(address, value);
 514 }
 515
 516 /* two tracks with 0x1820 words of length */
 517 static uint8_t game_save[2][0x1820 << 1];
 518 static int last_track = 0;
 519
 520 /* game reads track with saved game */
 521 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 522 {
 523         if (length > sizeof(game_save[0])) {
 524                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 525                 return;
 526         }
 527
 528         /* if even track is selected, load game */
 529         if (!(track & 1)) {
 530                 char filename[256];
 531                 int gamesave_num = (track - 2) >> 1;
 532                 int got;
 533                 FILE *fp;
 534
 535                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 536 #if defined(_WIN32)
 537                 filename[0] = '\0';
 538 #else
 539                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 540                 mkdir(filename, 0777);
 541 #endif
 542                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 543                 fp = fopen(filename, "r");
 544                 if (!fp) {
 545 fail:
 546                         print_error("failed to load game from '%s'\n", filename);
 547                         goto copy;
 548                 }
 549                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 550                 fclose(fp);
 551                 if (got != 2)
 552                         goto fail;
 553         }
 554
 555 copy:
 556         /* copy track */
 557         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 558 }
 559
 560 /* game writes track with saved game */
 561 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 562 {
 563         /* skip sync info that is provided by game and only relevant for a real disk track */
 564         data += 0x200;
 565         length -= 0x200;
 566
 567         if (length != sizeof(game_save[0])) {
 568                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 569                 return;
 570         }
 571
 572         /* don't save if last track is the same, because disk is written on both sides with the same data */
 573         if (track == last_track) {
 574                 if (memcmp(memory + data, game_save[track & 1], length)) {
 575                         print_error("saving game data on other side of the disk is different, please fix!\n");
 576                 }
 577                 return;
 578         }
 579         last_track = track;
 580
 581         /* save game data */
 582         memcpy(game_save[track & 1], memory + data, length);
 583
 584         /* if done with saving */
 585         if ((track & 1)) {
 586                 char filename[256];
 587                 int gamesave_num = (track - 2) >> 1;
 588                 int wrote;
 589                 FILE *fp;
 590
 591 #if defined(_WIN32)
 592                 filename[0] = '\0';
 593 #else
 594                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 595                 mkdir(filename, 0777);
 596 #endif
 597                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 598                 fp = fopen(filename, "w");
 599                 if (!fp) {
 600 fail:
 601                         print_error("failed to save game to '%s'\n", filename);
 602                         return;
 603                 }
 604                 print_info("Game state saved to '%s'\n", filename);
 605                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 606                 fclose(fp);
 607                 if (wrote != 2)
 608                         goto fail;
 609         }
 610 }
 611
 612 static void osd_info(const char *param, const char *value)
 613 {
 614         char line[41] = "                                        ";
 615
 616         if (param[0]) {
 617                 strncpy(line + 21 - strlen(param), param, strlen(param));
 618                 line[22] = ':';
 619         }
 620         if (strlen(value) > 15) {
 621                 print_error("string too long\n");
 622                 return;
 623         }
 624         strncpy(line + 25, value, strlen(value));
 625         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 626         osd_timer = SDL_GetTicks() + 2500;
 627 }
 628
 629 static int shift = 0, ctrl = 0;
 630
 631 static void keyboard_sdl(int down, SDL_Keycode sym)
 632 {
 633         switch (sym) {
 634         case SDLK_LCTRL:
 635         case SDLK_RCTRL:
 636                 ctrl = down;
 637                 break;
 638         }
 639
 640         if (ctrl && down) {
 641                 switch (sym) {
 642                 case SDLK_h:
 643                         help_view ^= 1;
 644                         break;
 645                 case SDLK_v:
 646                         config_video_filter ^= 1;
 647                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 648                         break;
 649                 case SDLK_a:
 650                         config_audio_filter ^= 1;
 651                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 652                         break;
 653                 case SDLK_s:
 654                         config_amiga_speed ^= 1;
 655                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 656                         break;
 657                 case SDLK_r:
 658                         config_render ^= 1;
 659                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 660                         break;
 661                 case SDLK_b:
 662                         if (!config_render) {
 663                                 osd_info("", "not applicable");
 664                                 break;
 665                         }
 666                         if (config_benson_size == 0.5) {
 667                                 config_benson_size = 1.0;
 668                                 config_fov = FOV_NOVAGEN;
 669                         } else {
 670                                 config_benson_size = 0.5;
 671                                 config_fov = FOV_JOLLY;
 672                         }
 673                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 674                         break;
 675                 case SDLK_i:
 676                         if (!intro_skipped)
 677                                 skip_intro();
 678                         else
 679                                 osd_info("", "not applicable");
 680                         break;
 681                 case SDLK_c:
 682                         if (config_ctrl_c)
 683                                 quit = 1;
 684                         break;
 685                 case SDLK_KP_PLUS:
 686                         if (config_fov / 1.2 >= FOV_MIN)
 687                                 config_fov /= 1.2;
 688                         disp_fov:
 689                         {
 690                                 char text[16];
 691                                 sprintf(text, "%.2f", config_fov);
 692                                 osd_info("FOV", text);
 693                         }
 694                         break;
 695                 case SDLK_KP_MINUS:
 696                         if (config_fov * 1.2 <= FOV_MAX)
 697                                 config_fov *= 1.2;
 698                         goto disp_fov;
 699                 }
 700                 /* do not pass keys to game while holding CTRL */
 701                 return;
 702         }
 703
 704         if (sym == SDLK_PAUSE && down)
 705                 help_view ^= 1;
 706
 707         /* in help view we don't need to forward keypresses */
 708         if (help_view)
 709                 return;
 710
 711         switch (sym) {
 712         case SDLK_LSHIFT:
 713                 set_key("LSH", down);
 714                 shift = down;
 715                 break;
 716         case SDLK_RSHIFT:
 717                 set_key("RSH", down);
 718                 shift = down;
 719                 break;
 720         case SDLK_LEFT:
 721                 if (shift && down) {
 722                         set_key("LF", down);
 723                         set_joystick(-1, -1, -1, -1, -1);
 724                         break;
 725                 }
 726                 set_key("LF", 0);
 727                 set_joystick(down, -1, -1, -1, -1);
 728                 break;
 729         case SDLK_RIGHT:
 730                 if (shift && down) {
 731                         set_key("RT", down);
 732                         set_joystick(-1, -1, -1, -1, -1);
 733                         break;
 734                 }
 735                 set_key("RT", 0);
 736                 set_joystick(-1, down, -1, -1, -1);
 737                 break;
 738         case SDLK_UP:
 739                 if (shift && down) {
 740                         set_key("UP", down);
 741                         set_joystick(-1, -1, -1, -1, -1);
 742                         break;
 743                 }
 744                 set_key("UP", 0);
 745                 set_joystick(-1, -1, down, -1, -1);
 746                 break;
 747         case SDLK_DOWN:
 748                 if (shift && down) {
 749                         set_key("DN", down);
 750                         set_joystick(-1, -1, -1, -1, -1);
 751                         break;
 752                 }
 753                 set_key("DN", 0);
 754                 set_joystick(-1, -1, -1, down, -1);
 755                 break;
 756         case SDLK_END:
 757                 set_joystick(-1, -1, -1, -1, down);
 758                 break;
 759
 760         case SDLK_a: set_key("A", down); break;
 761         case SDLK_b: set_key("B", down); break;
 762         case SDLK_c: set_key("C", down); break;
 763         case SDLK_d: set_key("D", down); break;
 764         case SDLK_e: set_key("E", down); break;
 765         case SDLK_f: set_key("F", down); break;
 766         case SDLK_g: set_key("G", down); break;
 767         case SDLK_h: set_key("H", down); break;
 768         case SDLK_i: set_key("I", down); break;
 769         case SDLK_j: set_key("J", down); break;
 770         case SDLK_k: set_key("K", down); break;
 771         case SDLK_l: set_key("L", down); break;
 772         case SDLK_m: set_key("M", down); break;
 773         case SDLK_n: set_key("N", down); break;
 774         case SDLK_o: set_key("O", down); break;
 775         case SDLK_p: set_key("P", down); break;
 776         case SDLK_q: set_key("Q", down); break;
 777         case SDLK_r: set_key("R", down); break;
 778         case SDLK_s: set_key("S", down); break;
 779         case SDLK_t: set_key("T", down); break;
 780         case SDLK_u: set_key("U", down); break;
 781         case SDLK_v: set_key("V", down); break;
 782         case SDLK_w: set_key("W", down); break;
 783         case SDLK_x: set_key("X", down); break;
 784         case SDLK_y: set_key("Y", down); break;
 785         case SDLK_z: set_key("Z", down); break;
 786
 787         case SDLK_0: set_key("0", down); break;
 788         case SDLK_1: set_key("1", down); break;
 789         case SDLK_2: set_key("2", down); break;
 790         case SDLK_3: set_key("3", down); break;
 791         case SDLK_4: set_key("4", down); break;
 792         case SDLK_5: set_key("5", down); break;
 793         case SDLK_6: set_key("6", down); break;
 794         case SDLK_7: set_key("7", down); break;
 795         case SDLK_8: set_key("8", down); break;
 796         case SDLK_9: set_key("9", down); break;
 797
 798         case SDLK_KP_0: set_key("NP0", down); break;
 799         case SDLK_KP_1: set_key("NP1", down); break;
 800         case SDLK_KP_2: set_key("NP2", down); break;
 801         case SDLK_KP_3: set_key("NP3", down); break;
 802         case SDLK_KP_4: set_key("NP4", down); break;
 803         case SDLK_KP_5: set_key("NP5", down); break;
 804         case SDLK_KP_6: set_key("NP6", down); break;
 805         case SDLK_KP_7: set_key("NP7", down); break;
 806         case SDLK_KP_8: set_key("NP8", down); break;
 807         case SDLK_KP_9: set_key("NP9", down); break;
 808         case SDLK_KP_DIVIDE: set_key("NPDIV", down); break;
 809         case SDLK_KP_MULTIPLY: set_key("NPMUL", down); break;
 810         case SDLK_KP_MINUS: set_key("NPSUB", down); break;
 811         case SDLK_KP_PLUS: set_key("NPADD", down); break;
 812         case SDLK_KP_PERIOD: set_key("NPDEL", down); break;
 813         // NPLPAREN and NPRPAREN are not emulated
 814
 815         case SDLK_F1: set_key("F1", down); break;
 816         case SDLK_F2: set_key("F2", down); break;
 817         case SDLK_F3: set_key("F3", down); break;
 818         case SDLK_F4: set_key("F4", down); break;
 819         case SDLK_F5: set_key("F5", down); break;
 820         case SDLK_F6: set_key("F6", down); break;
 821         case SDLK_F7: set_key("F7", down); break;
 822         case SDLK_F8: set_key("F8", down); break;
 823         case SDLK_F9: set_key("F9", down); break;
 824         case SDLK_F10: set_key("F10", down); break;
 825
 826         case SDLK_SPACE: set_key("SPC", down); break;
 827         case SDLK_BACKSPACE: set_key("BS", down); break;
 828         case SDLK_TAB: set_key("TAB", down); break;
 829         case SDLK_KP_ENTER: set_key("ENT", down); break;
 830         case SDLK_RETURN: set_key("RET", down); break;
 831         case SDLK_ESCAPE: set_key("ESC", down); break;
 832         case SDLK_DELETE: set_key("DEL", down); break;
 833         case SDLK_INSERT: set_key("HELP", down); break;
 834
 835         }
 836 }
 837
 838 void audio_sdl(float *data, int length)
 839 {
 840         int fill, s;
 841
 842         /* read sound from sound buffer
 843          * buffer pointer read and write is atomic, so no locking required!
 844          */
 845         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
 846         if (fill < length) {
 847 #ifdef DEBUG_SOUND_BUFFERING
 848                 fprintf(stderr, "sound buffer underrun\n");
 849 #endif
 850                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
 851                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
 852         }
 853         for (s = 0; s < length; s++) {
 854                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
 855                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
 856         }
 857 #ifdef DEBUG_SOUND_BUFFERING
 858         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
 859 #endif
 860         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
 861 }
 862
 863 int main(int argc, char *argv[])
 864 {
 865         int rc;
 866         int sdl_sound_chunk;
 867
 868         home_dir = getenv("HOME");
 869         if (!home_dir)
 870                 home_dir = "";
 871
 872         rc = parse_args(argc, argv);
 873         if (rc)
 874                 return 0;
 875
 876         /* allocate image */
 877         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
 878         if (!image) {
 879                 print_error("Failed to allocate image buffer\n");
 880                 goto done;
 881         }
 882
 883         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
 884                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
 885                 goto done;
 886         }
 887         if ((1000 % IRQ_RATE)) {
 888                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
 889                 goto done;
 890         }
 891
 892         /* calculate SDL chunk size for audio
 893          * it must be a power of two, but not more than the chunk size for each IRQ!
 894          */
 895         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
 896                 ;
 897         sdl_sound_chunk >>= 1;
 898 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
 899
 900         /* allocate sound buffers */
 901         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
 902         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
 903         if (!sound_buffer) {
 904                 print_error("Failed to allocate image buffer\n");
 905                 goto done;
 906         }
 907
 908         /* allocate memory */
 909         memory = calloc(MEMORY_SIZE, 1);
 910         if (!memory) {
 911                 print_error("Failed to allocate cpu's memory\n");
 912                 goto done;
 913         }
 914         stop_event = calloc(MEMORY_SIZE, 1);
 915         if (!stop_event) {
 916                 print_error("Failed to allocate cpu's stop_event memory\n");
 917                 goto done;
 918         }
 919         chipreg = calloc(IOSIZE, 1);
 920         if (!chipreg) {
 921                 print_error("Failed to allocate chip register\n");
 922                 goto done;
 923         }
 924
 925         /* init cpu code */
 926         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
 927
 928         /* init disk emulation */
 929         disk_init(disk_read, disk_write);
 930
 931         /* load binary */
 932         mercenary_load();
 933
 934         /* patch some stuff */
 935         mercenary_patch();
 936
 937         /* init SDL and OpenGL */
 938         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);
 939         if (rc < 0)
 940                 goto done;
 941         rc = init_opengl((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
 942         if (rc < 0)
 943                 goto done;
 944         resize_opengl((config_debug_opengl) ? SCREEN_WIDTH * 2 : SCREEN_WIDTH * 3, (config_debug_opengl) ? SCREEN_HEIGHT * 4 : SCREEN_HEIGHT * 3);
 945
 946         /* init osd */
 947         rc = init_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
 948         if (rc < 0)
 949                 goto done;
 950         rc = init_osd(1, OSD_WIDTH, OSD_HEIGHT);
 951         if (rc < 0)
 952                 goto done;
 953         help_osd = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
 954         if (!help_osd)
 955                 goto done;
 956         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
 957         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
 958                 "Emulation:\n"
 959                 "        Press `PAUSE' to toggle this help screen on or off.\n"
 960                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
 961                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
 962                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
 963                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
 964                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
 965                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
 966                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
 967                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
 968                 "\n"
 969                 "Answer to a Question:\n"
 970                 "        Press `O' (not Zero) for OK and other key for NO.\n"
 971                 "\n"
 972                 "Walking / Driving / Flying:\n"
 973                 "        Use cursor keys as joystick, to move player / craft.\n"
 974                 "        Press `R' for running, 'W' for walking speed.\n"
 975                 "        Press `B' to board, `L' to leave.\n"
 976                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
 977                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
 978                 "        Press `SPACE' to stop craft.\n"
 979                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
 980                 "        Press `T' for turbo on certain craft.\n"
 981                 "        Press `END' as joystick's fire button.\n"
 982                 "\n"
 983                 "Elevator:\n"
 984                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
 985                 "\n"
 986                 "Inside a transporter:\n"
 987                 "        Press `1'...`0' to select destination.\n"
 988                 "\n"
 989                 "Items:\n"
 990                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
 991                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
 992                 "        Press `NUMPAD Enter' to select certain items.\n"
 993                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
 994                 "        Press `NUMPAD *' to read entry\n"
 995                 "Saving / Loading / Pause:\n"
 996                 "        Press `INSERT' to loading and saving options.\n"
 997                 "        Press `ENTER' to pause game, other key to continue.\n"
 998                 ,HELP_ALPHA, 1, 2, 5, 0);
 999         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1000         if (!info_osd)
1001                 goto done;
1002
1003         /* init audio filter */
1004         sound_init_filter(SOUND_SAMPLERATE);
1005
1006         /* start cpu */
1007         reset_cpu();
1008
1009         if (config_skip_intro)
1010                 skip_intro();
1011
1012         /* run game */
1013         main_loop();
1014
1015 done:
1016         exit_opengl();
1017         exit_sdl();
1018
1019         if (chipreg)
1020                 free(chipreg);
1021         if (stop_event)
1022                 free(stop_event);
1023         if (memory)
1024                 free(memory);
1025         if (sound_buffer)
1026                 free(sound_buffer);
1027         if (image)
1028                 free(image);
1029         if (help_osd)
1030                 free(help_osd);
1031         if (info_osd)
1032                 free(info_osd);
1033
1034         return 0;
1035 }
1036