src/mercenary/main.c

   1 /* main routine
   2  *
   3  * (C) 2018 by Andreas Eversberg <jolly@eversberg.eu>
   4  * All Rights Reserved
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdint.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/stat.h>
  25 #include <sys/types.h>
  26 #include "../libsdl/sdl.h"
  27 #include "../libsdl/opengl.h"
  28 #include "../libsdl/print.h"
  29 #include "../libcpu/m68k.h"
  30 #include "../libcpu/execute.h"
  31 #include "../libframerate/framerate.h"
  32 #include "../libvideo/video.h"
  33 #include "../libsound/sound.h"
  34 #include "../libjoystick/joystick.h"
  35 #include "../libkeyboard/keyboard.h"
  36 #include "../libdisk/disk.h"
  37 #include "../libtext/text.h"
  38 #include "mercenary.h"
  39 #include "render.h"
  40
  41 #define FOV_MIN         10.0
  42 #define FOV_NOVAGEN     64.0
  43 #define FOV_JOLLY       80.0
  44 #define FOV_MAX         170.0
  45
  46 static int config_ctrl_c = 0;
  47 static int config_amiga_speed = 1;
  48 #warning fixme: make use of 10 for intro, then be as fast as given
  49 static double config_fps = 16.0;
  50 #if !defined(_WIN32)
  51 static const char *config_gamesave_dir = ".mercenary";
  52 #endif
  53 static int config_video_filter = 1;
  54 static int config_audio_filter = 1;
  55 static int config_render = 0;
  56 static int config_skip_intro = 0;
  57 static int config_multisampling = 16;
  58 static double config_fov = FOV_NOVAGEN;
  59 static double config_benson_size = 1.0;
  60 static int config_debug_transparent = 0;
  61 static int config_debug_opengl = 0;
  62 /* render improvements */
  63 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  64
  65 #define CPU_SPEED       7093790.0;
  66
  67 #define SOUND_SAMPLERATE 48000
  68 /* - game IRQ rate
  69  * - must be used for sound rendering chunk
  70  */
  71 #define IRQ_RATE        50
  72 /* numbe of buffer chunks to dejitter:
  73  * - SDL render interval
  74  * - sound rendering interval
  75  * - sound card interval
  76  * 4 should be minimum, if video rate is >=50 Hz
  77  */
  78 #define SOUND_CHUNKS    4
  79
  80 /* test sound to check if buffer does not overflow / underrun */
  81 //#define DEBUG_SOUND_BUFFERING
  82
  83 #define IOSIZE          0x1000 /* bytes in io space */
  84 #define MEMORY_SIZE     0x80000
  85 static uint8_t *memory = NULL;
  86 static uint8_t *stop_event = NULL;
  87 static uint8_t *image = NULL;
  88 static uint8_t *help_osd = NULL;
  89 static uint8_t *info_osd = NULL;
  90 static int help_view = 1;
  91 static int32_t osd_timer = 0;
  92 #define SCREEN_WIDTH    320
  93 #define SCREEN_HEIGHT   200
  94 #define IMAGE_WIDTH     320
  95 #define IMAGE_HEIGHT    200
  96 #define BENSON_AT_LINE  136
  97 #define IMAGE_DIWSTART  0x2c
  98 #define HELP_ALPHA      0xd0
  99 #define OSD_WIDTH       320
 100 #define OSD_HEIGHT      16
 101 static uint16_t *chipreg = NULL;
 102 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 103 static int sound_buffer_size; /* buffer sample size */
 104 static int sound_buffer_writep; /* write pointer at buffer */
 105 static int sound_buffer_readp; /* read pointer at buffer */
 106 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 107 static double benson_size; /* render size of benson */
 108 static int render_legacy = 0; /* render original amiga screen, if set */
 109 static int render_improved = 0; /* render improved image, if set */
 110 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 111 static int intro_skipped = 0; /* indicated if we already have landed */
 112
 113 static const char *home_dir;
 114
 115 static int quit = 0;
 116
 117 int parse_args(int argc, char *argv[])
 118 {
 119         int i = 1;
 120
 121         while (argc > i) {
 122                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 123                         print_info("Usage: %s\n", argv[0]);
 124                         print_info(" -s --render-speed original | fast\n");
 125                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 126                         print_info("    --fps <fps>\n");
 127                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 128                         print_info(" -v --video-filter on | off\n");
 129                         print_info("        Set video filter.\n");
 130                         print_info(" -a --audio-filter on | off\n");
 131                         print_info("        Set audio filter.\n");
 132                         print_info(" -r --render original | opengl\n");
 133                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 134                         print_info(" -b --benson normal | half\n");
 135                         print_info("        Size of 'Benson' (control panel).\n");
 136                         print_info(" -m --multisampling <samples>\n");
 137                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 138                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 139                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 140                         print_info(" -i --skip-intro\n");
 141                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 142                         print_info("Debug options:\n");
 143                         print_info(" -o --debug-opengl\n");
 144                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 145                         print_info("    --debug-transparent\n");
 146                         print_info("        Draw all things half transparent.\n");
 147                         print_info("    --ctrl-c\n");
 148                         print_info("        Use CTRL+C to exit game (used for development)\n");
 149                         return -1;
 150                 } else
 151                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 152                         i++;
 153                         if (argc == i) {
 154 missing_parameter:
 155                                 print_info("Missing parameter, use '--help'!\n");
 156                                 return -1;
 157                         }
 158                         if (!strcmp(argv[i], "original"))
 159                                 config_amiga_speed = 1;
 160                         else
 161                         if (!strcmp(argv[i], "fast"))
 162                                 config_amiga_speed = 0;
 163                         else {
 164 illegal_parameter:
 165                                 print_info("Illegal parameter, use '--help'!\n");
 166                                 return -1;
 167                         }
 168                 } else
 169                 if (!strcmp(argv[i], "--fps")) {
 170                         i++;
 171                         if (argc == i)
 172                                 goto missing_parameter;
 173                         config_fps = atof(argv[i]);
 174                         if (config_fov <= 0.0)
 175                                 goto illegal_parameter;
 176                 } else
 177                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 178                         i++;
 179                         if (argc == i)
 180                                 goto missing_parameter;
 181                         if (!strcmp(argv[i], "on"))
 182                                 config_video_filter = 1;
 183                         else
 184                         if (!strcmp(argv[i], "off"))
 185                                 config_video_filter = 0;
 186                         else
 187                                 goto illegal_parameter;
 188                 } else
 189                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 190                         i++;
 191                         if (argc == i)
 192                                 goto missing_parameter;
 193                         if (!strcmp(argv[i], "on"))
 194                                 config_audio_filter = 1;
 195                         else
 196                         if (!strcmp(argv[i], "off"))
 197                                 config_audio_filter = 0;
 198                         else
 199                                 goto illegal_parameter;
 200                 } else
 201                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 202                         i++;
 203                         if (argc == i)
 204                                 goto missing_parameter;
 205                         if (!strcmp(argv[i], "original"))
 206                                 config_render = 0;
 207                         else
 208                         if (!strcmp(argv[i], "opengl"))
 209                                 config_render = 1;
 210                         else
 211                                 goto illegal_parameter;
 212                 } else
 213                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 214                         i++;
 215                         if (argc == i)
 216                                 goto missing_parameter;
 217                         if (!strcmp(argv[i], "normal"))
 218                                 config_benson_size = 1.0;
 219                         else
 220                         if (!strcmp(argv[i], "half")) {
 221                                 config_benson_size = 0.5;
 222                                 if (config_fov == FOV_NOVAGEN)
 223                                         config_fov = FOV_JOLLY;
 224                         } else
 225                                 goto illegal_parameter;
 226                 } else
 227                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 228                         i++;
 229                         if (argc == i)
 230                                 goto missing_parameter;
 231                         config_multisampling = atoi(argv[i]);
 232                 } else
 233                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 234                         i++;
 235                         if (argc == i)
 236                                 goto missing_parameter;
 237                         config_fov = atof(argv[i]);
 238                         if (config_fov < 1.0 || config_fov > 179.0)
 239                                 goto illegal_parameter;
 240                 } else
 241                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 242                         config_skip_intro = 1;
 243                 } else
 244                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 245                         config_debug_opengl = 1;
 246                 } else
 247                 if (!strcmp(argv[i], "--debug-transparent")) {
 248                         config_debug_transparent = 1;
 249                 } else
 250                 if (!strcmp(argv[i], "--ctrl-c")) {
 251                         config_ctrl_c = 1;
 252                 } else {
 253                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 254                         return -1;
 255                 }
 256                 i++;
 257         }
 258
 259         return 0;
 260 }
 261
 262 static void skip_intro(void)
 263 {
 264         int event;
 265         double render_delay = 0.0;
 266         double cycle_count;
 267
 268         if (intro_skipped)
 269                 return;
 270
 271         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 272         do {
 273                 /* render, if not delayed */
 274                 if (render_delay <= 0.0) {
 275                         cycle_count = 0;
 276                         do {
 277                                 cycle_count += execute_cpu(0, &event);
 278                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 279                         render_delay += (double)cycle_count / CPU_SPEED;
 280                 }
 281                 /* VBL */
 282                 execute_cpu(3, NULL);
 283                 /* count down render delay */
 284                 if (render_delay) {
 285                         render_delay -= 1.0 / (double)IRQ_RATE;
 286                         if (render_delay < 0.0)
 287                                 render_delay = 0.0;
 288                 }
 289         } while (event != STOP_AT_CLEAR_SCREEN1);
 290
 291         intro_skipped = 1;
 292 }
 293
 294 static void special_event(int event)
 295 {
 296         if (render_improved)
 297                 render_capture_event(event);
 298 }
 299
 300 static void main_loop(void)
 301 {
 302         double frame_step, frame_time = 0.0, frame_render = 1;
 303         int had_first_irq = 0;
 304         int render_improved_rc;
 305         static uint32_t current_time, last_time = 0, diff;
 306         int i, rc;
 307         int space, length;
 308         int cycle_count, event = STOP_AT_END;
 309         double render_delay = 0.0;
 310         uint32_t palette_address;
 311         uint16_t palette[16];
 312
 313         last_time = ticks_sdl();
 314
 315         /* render result on window */
 316         while (!quit) {
 317 #warning oder ganz anders: bevor landung machen wir amiga-rate als interpolation
 318                 /* if we are in interstellar fligt, we use 50 Hz */
 319                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 320                 /* else we use whatever frame rate the user wants */
 321                 if (render_capture_is_interstellar())
 322                         frame_step = vbl_duration * 50.0;
 323                 else
 324                         frame_step = vbl_duration * config_fps;
 325                 if (frame_step > 1.0)
 326                         frame_step = 1.0;
 327                 /* handle SDL events */
 328                 rc = event_sdl();
 329                 if (rc)
 330                         break;
 331
 332                 /* clear screen */
 333                 opengl_clear();
 334
 335                 /* initialize rendering */
 336                 debug_opengl = config_debug_opengl;
 337                 benson_size = config_benson_size;
 338                 render_legacy = (!config_render) || debug_opengl;
 339                 render_improved = config_render || debug_opengl;
 340                 if (!render_improved) {
 341                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 342                         render_capture_reset();
 343                 }
 344                 if (render_improved)
 345                         opengl_viewport_improved(debug_opengl, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 346                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 347                 /* amgia speed: don't render if we still delay */
 348                 /* non amiga speed: render if we need a new frame */
 349                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 350                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 351                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 352                 if (((frame_render && !config_amiga_speed)
 353                   || (config_amiga_speed && render_delay <= 0.0)
 354                   || event == STOP_AT_WAIT_INPUT)
 355                 && !(had_first_irq && help_view)) {
 356                         frame_render = 0;
 357                         /* start capturing for improved graphics */
 358                         if (render_improved)
 359                                 render_capture_start(config_fov, config_improve_extend_roads, config_debug_transparent);
 360
 361                         /* execute until the rendered image is ready (wait for VBL) */
 362                         cycle_count = 0;
 363                         do {
 364                                 cycle_count += execute_cpu(0, &event);
 365                                 /* handle special events */
 366                                 special_event(event);
 367                                 if (event == STOP_AT_CLEAR_SCREEN1)
 368                                         intro_skipped = 1;
 369                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 370                         /* stop capturing for improved graphics */
 371                         if (render_improved)
 372                                 render_capture_stop();
 373                         /* copy palette */
 374                         palette_address = mercenary_palette_view();
 375                         for (i = 0; i < 16; i++)
 376                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 377                         /* for amiga speed: set delay by the number of cycles */
 378                         if (config_amiga_speed)
 379                                 render_delay += (double)cycle_count / CPU_SPEED;
 380                 }
 381                 /* render improved graphics, interpolate, if required */
 382                 if (render_improved)
 383                         render_improved_rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time);
 384                 else
 385                         render_improved_rc = -1;
 386                 /* advance frame time, if we are not in help view  */
 387                 if (!(had_first_irq && help_view)) {
 388 //printf("frame rate: %.6f, frame-step=%.5f frame-time=%.5f\n", 1.0 / vbl_duration, frame_step,frame_time);
 389                         frame_time += frame_step;
 390                         if (frame_time >= 1.0) {
 391                                 frame_time -= 1.0;
 392                                 frame_render = 1;
 393                         }
 394                 }
 395
 396                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 397                 if (had_first_irq) {
 398                         /* render game view without benson
 399                          * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 400                          */
 401                         if (render_legacy || render_improved_rc)
 402                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 403                 }
 404                 /* render benson + osd ontop of improved opengl rendering, if enabled */
 405                 if (render_improved && render_improved_rc == 0) {
 406                         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);
 407                         if (help_view)
 408                                 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);
 409                         if (osd_timer) {
 410                                 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);
 411                                 if (osd_timer - (int32_t)ticks_sdl() < 0)
 412                                         osd_timer = 0;
 413                         }
 414                 }
 415                 /* setup viewport for legacy image and render image, if enabled */
 416                 /* also render legacy, if render_improved failed due to not (yet) available items */
 417                 if (render_legacy || (render_improved && render_improved_rc)) {
 418                         opengl_viewport_legacy(debug_opengl);
 419                         opengl_blit_legacy(image, config_video_filter);
 420                         if (help_view)
 421                                 opengl_blit_osd(0, help_osd, config_video_filter, 0, 0.0, 0, 1.0, 1.0, 0.0, 0.0);
 422                         if (osd_timer) {
 423                                 opengl_blit_osd(1, info_osd, config_video_filter, 0, 0.0, 0, 0.5, 0.04, 0.5, -0.95);
 424                                 if (osd_timer - (int32_t)ticks_sdl() < 0)
 425                                         osd_timer = 0;
 426                         }
 427                 }
 428
 429                 /* at this point we are ready with our image, so we display */
 430                 swap_sdl();
 431                 /* measure frame rate */
 432                 framerate_measure();
 433
 434                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 435                 /* only do this, if we are not in help view */
 436                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 437                 if (!(had_first_irq && help_view)) {
 438                         current_time = ticks_sdl();
 439                         diff = current_time - last_time;
 440                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 441                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 442                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 443                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 444                         }
 445                         while (diff > 1000 / IRQ_RATE) {
 446                                 /* trigger and execute IRQ 3 = VBL */
 447                                 execute_cpu(3, NULL);
 448                                 had_first_irq = 1;
 449                                 /* transfer benson without game view
 450                                  * because we only got benson refreshed during VBL IRQ
 451                                  */
 452                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 453                                 /* render sound to sound buffer
 454                                  * buffer pointer read and write is atomic, so no locking required!
 455                                  */
 456                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 457                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 458 #ifdef DEBUG_SOUND_BUFFERING
 459                                         fprintf(stderr, "sound buffer overflow\n");
 460 #endif
 461                                         length = space;
 462                                 } else
 463                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 464 #ifdef DEBUG_SOUND_BUFFERING
 465                                 printf("can write %d, write %d\n", space, length);
 466                                 static int cnt = 0;
 467                                 int s;
 468                                 for (s = 0; s < length; s++) {
 469                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 470                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 471                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 472                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 473                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 474                                          cnt++;
 475                                 }
 476 #else
 477                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 478 #endif
 479                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 480                                 diff -= 1000 / IRQ_RATE;
 481                                 last_time += 1000 / IRQ_RATE;
 482
 483                                 /* count down render delay */
 484                                 if (render_delay) {
 485                                         render_delay -= 1.0 / (double)IRQ_RATE;
 486                                         if (render_delay < 0.0)
 487                                                 render_delay = 0.0;
 488                                 }
 489                         }
 490                 }
 491         }
 492 }
 493
 494 static uint16_t io_read(uint32_t address)
 495 {
 496         uint16_t value = 0xffff;
 497
 498         /* joystick and fire button */
 499         if (address == 0xbfe000 || address == 0xdff00c)
 500                 value &= emulate_joystick_read(address);
 501         /* keyboard */
 502         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 503                 value &= emulate_keyboard_read(address);
 504         /* diskette */
 505         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 506                 value &= emulate_disk_read(address);
 507
 508         return value;
 509 }
 510
 511 static void io_write(uint32_t address, uint16_t value)
 512 {
 513         /* dmacon and sound registers */
 514         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 515                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 516         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 517                 emulate_disk_write(address, value);
 518 }
 519
 520 /* two tracks with 0x1820 words of length */
 521 static uint8_t game_save[2][0x1820 << 1];
 522 static int last_track = 0;
 523
 524 /* game reads track with saved game */
 525 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 526 {
 527         if (length > sizeof(game_save[0])) {
 528                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 529                 return;
 530         }
 531
 532         /* if even track is selected, load game */
 533         if (!(track & 1)) {
 534                 char filename[256];
 535                 int gamesave_num = (track - 2) >> 1;
 536                 int got;
 537                 FILE *fp;
 538
 539                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 540 #if defined(_WIN32)
 541                 filename[0] = '\0';
 542 #else
 543                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 544                 mkdir(filename, 0777);
 545 #endif
 546                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 547                 fp = fopen(filename, "r");
 548                 if (!fp) {
 549 fail:
 550                         print_error("failed to load game from '%s'\n", filename);
 551                         goto copy;
 552                 }
 553                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 554                 fclose(fp);
 555                 if (got != 2)
 556                         goto fail;
 557         }
 558
 559 copy:
 560         /* copy track */
 561         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 562 }
 563
 564 /* game writes track with saved game */
 565 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 566 {
 567         /* skip sync info that is provided by game and only relevant for a real disk track */
 568         data += 0x200;
 569         length -= 0x200;
 570
 571         if (length != sizeof(game_save[0])) {
 572                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 573                 return;
 574         }
 575
 576         /* don't save if last track is the same, because disk is written on both sides with the same data */
 577         if (track == last_track) {
 578                 if (memcmp(memory + data, game_save[track & 1], length)) {
 579                         print_error("saving game data on other side of the disk is different, please fix!\n");
 580                 }
 581                 return;
 582         }
 583         last_track = track;
 584
 585         /* save game data */
 586         memcpy(game_save[track & 1], memory + data, length);
 587
 588         /* if done with saving */
 589         if ((track & 1)) {
 590                 char filename[256];
 591                 int gamesave_num = (track - 2) >> 1;
 592                 int wrote;
 593                 FILE *fp;
 594
 595 #if defined(_WIN32)
 596                 filename[0] = '\0';
 597 #else
 598                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 599                 mkdir(filename, 0777);
 600 #endif
 601                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 602                 fp = fopen(filename, "w");
 603                 if (!fp) {
 604 fail:
 605                         print_error("failed to save game to '%s'\n", filename);
 606                         return;
 607                 }
 608                 print_info("Game state saved to '%s'\n", filename);
 609                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 610                 fclose(fp);
 611                 if (wrote != 2)
 612                         goto fail;
 613         }
 614 }
 615
 616 static void osd_info(const char *param, const char *value)
 617 {
 618         char line[41] = "                                        ";
 619
 620         if (param[0]) {
 621                 strncpy(line + 21 - strlen(param), param, strlen(param));
 622                 line[22] = ':';
 623         }
 624         if (strlen(value) > 15) {
 625                 print_error("string too long\n");
 626                 return;
 627         }
 628         strncpy(line + 25, value, strlen(value));
 629         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 630         osd_timer = ticks_sdl() + 2500;
 631 }
 632
 633 static int shift = 0, ctrl = 0;
 634
 635 static void keyboard_sdl(int down, enum keycode keycode)
 636 {
 637         switch (keycode) {
 638         case KEYCODE_LCTRL:
 639         case KEYCODE_RCTRL:
 640                 ctrl = down;
 641                 break;
 642         default: break;
 643         }
 644
 645         if (ctrl && down) {
 646                 switch (keycode) {
 647                 case KEYCODE_h:
 648                         help_view ^= 1;
 649                         break;
 650                 case KEYCODE_v:
 651                         config_video_filter ^= 1;
 652                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 653                         break;
 654                 case KEYCODE_a:
 655                         config_audio_filter ^= 1;
 656                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 657                         break;
 658                 case KEYCODE_s:
 659                         config_amiga_speed ^= 1;
 660                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 661                         break;
 662                 case KEYCODE_r:
 663                         config_render ^= 1;
 664                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 665                         break;
 666                 case KEYCODE_b:
 667                         if (!config_render) {
 668                                 osd_info("", "not applicable");
 669                                 break;
 670                         }
 671                         if (config_benson_size == 0.5) {
 672                                 config_benson_size = 1.0;
 673                                 config_fov = FOV_NOVAGEN;
 674                         } else {
 675                                 config_benson_size = 0.5;
 676                                 config_fov = FOV_JOLLY;
 677                         }
 678                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 679                         break;
 680                 case KEYCODE_i:
 681                         if (!intro_skipped)
 682                                 skip_intro();
 683                         else
 684                                 osd_info("", "not applicable");
 685                         break;
 686                 case KEYCODE_c:
 687                         if (config_ctrl_c)
 688                                 quit = 1;
 689                         break;
 690                 case KEYCODE_KP_PLUS:
 691                         if (config_fov / 1.2 >= FOV_MIN)
 692                                 config_fov /= 1.2;
 693                         disp_fov:
 694                         {
 695                                 char text[16];
 696                                 sprintf(text, "%.2f", config_fov);
 697                                 osd_info("FOV", text);
 698                         }
 699                         break;
 700                 case KEYCODE_KP_MINUS:
 701                         if (config_fov * 1.2 <= FOV_MAX)
 702                                 config_fov *= 1.2;
 703                         goto disp_fov;
 704                 default: break;
 705                 }
 706                 /* do not pass keys to game while holding CTRL */
 707                 return;
 708         }
 709
 710         if (keycode == KEYCODE_PAUSE && down)
 711                 help_view ^= 1;
 712
 713         /* in help view we don't need to forward keypresses */
 714         if (help_view)
 715                 return;
 716
 717         switch (keycode) {
 718         case KEYCODE_LSHIFT:
 719                 set_key("LSH", down);
 720                 shift = down;
 721                 break;
 722         case KEYCODE_RSHIFT:
 723                 set_key("RSH", down);
 724                 shift = down;
 725                 break;
 726         case KEYCODE_LEFT:
 727                 if (shift && down) {
 728                         set_key("LF", down);
 729                         set_joystick(-1, -1, -1, -1, -1);
 730                         break;
 731                 }
 732                 set_key("LF", 0);
 733                 set_joystick(down, -1, -1, -1, -1);
 734                 break;
 735         case KEYCODE_RIGHT:
 736                 if (shift && down) {
 737                         set_key("RT", down);
 738                         set_joystick(-1, -1, -1, -1, -1);
 739                         break;
 740                 }
 741                 set_key("RT", 0);
 742                 set_joystick(-1, down, -1, -1, -1);
 743                 break;
 744         case KEYCODE_UP:
 745                 if (shift && down) {
 746                         set_key("UP", down);
 747                         set_joystick(-1, -1, -1, -1, -1);
 748                         break;
 749                 }
 750                 set_key("UP", 0);
 751                 set_joystick(-1, -1, down, -1, -1);
 752                 break;
 753         case KEYCODE_DOWN:
 754                 if (shift && down) {
 755                         set_key("DN", down);
 756                         set_joystick(-1, -1, -1, -1, -1);
 757                         break;
 758                 }
 759                 set_key("DN", 0);
 760                 set_joystick(-1, -1, -1, down, -1);
 761                 break;
 762         case KEYCODE_END:
 763                 set_joystick(-1, -1, -1, -1, down);
 764                 break;
 765
 766         case KEYCODE_a: set_key("A", down); break;
 767         case KEYCODE_b: set_key("B", down); break;
 768         case KEYCODE_c: set_key("C", down); break;
 769         case KEYCODE_d: set_key("D", down); break;
 770         case KEYCODE_e: set_key("E", down); break;
 771         case KEYCODE_f: set_key("F", down); break;
 772         case KEYCODE_g: set_key("G", down); break;
 773         case KEYCODE_h: set_key("H", down); break;
 774         case KEYCODE_i: set_key("I", down); break;
 775         case KEYCODE_j: set_key("J", down); break;
 776         case KEYCODE_k: set_key("K", down); break;
 777         case KEYCODE_l: set_key("L", down); break;
 778         case KEYCODE_m: set_key("M", down); break;
 779         case KEYCODE_n: set_key("N", down); break;
 780         case KEYCODE_o: set_key("O", down); break;
 781         case KEYCODE_p: set_key("P", down); break;
 782         case KEYCODE_q: set_key("Q", down); break;
 783         case KEYCODE_r: set_key("R", down); break;
 784         case KEYCODE_s: set_key("S", down); break;
 785         case KEYCODE_t: set_key("T", down); break;
 786         case KEYCODE_u: set_key("U", down); break;
 787         case KEYCODE_v: set_key("V", down); break;
 788         case KEYCODE_w: set_key("W", down); break;
 789         case KEYCODE_x: set_key("X", down); break;
 790         case KEYCODE_y: set_key("Y", down); break;
 791         case KEYCODE_z: set_key("Z", down); break;
 792
 793         case KEYCODE_0: set_key("0", down); break;
 794         case KEYCODE_1: set_key("1", down); break;
 795         case KEYCODE_2: set_key("2", down); break;
 796         case KEYCODE_3: set_key("3", down); break;
 797         case KEYCODE_4: set_key("4", down); break;
 798         case KEYCODE_5: set_key("5", down); break;
 799         case KEYCODE_6: set_key("6", down); break;
 800         case KEYCODE_7: set_key("7", down); break;
 801         case KEYCODE_8: set_key("8", down); break;
 802         case KEYCODE_9: set_key("9", down); break;
 803
 804         case KEYCODE_KP_0: set_key("NP0", down); break;
 805         case KEYCODE_KP_1: set_key("NP1", down); break;
 806         case KEYCODE_KP_2: set_key("NP2", down); break;
 807         case KEYCODE_KP_3: set_key("NP3", down); break;
 808         case KEYCODE_KP_4: set_key("NP4", down); break;
 809         case KEYCODE_KP_5: set_key("NP5", down); break;
 810         case KEYCODE_KP_6: set_key("NP6", down); break;
 811         case KEYCODE_KP_7: set_key("NP7", down); break;
 812         case KEYCODE_KP_8: set_key("NP8", down); break;
 813         case KEYCODE_KP_9: set_key("NP9", down); break;
 814         case KEYCODE_KP_DIVIDE: set_key("NPDIV", down); break;
 815         case KEYCODE_KP_MULTIPLY: set_key("NPMUL", down); break;
 816         case KEYCODE_KP_MINUS: set_key("NPSUB", down); break;
 817         case KEYCODE_KP_PLUS: set_key("NPADD", down); break;
 818         case KEYCODE_KP_PERIOD: set_key("NPDEL", down); break;
 819         // NPLPAREN and NPRPAREN are not emulated
 820
 821         case KEYCODE_F1: set_key("F1", down); break;
 822         case KEYCODE_F2: set_key("F2", down); break;
 823         case KEYCODE_F3: set_key("F3", down); break;
 824         case KEYCODE_F4: set_key("F4", down); break;
 825         case KEYCODE_F5: set_key("F5", down); break;
 826         case KEYCODE_F6: set_key("F6", down); break;
 827         case KEYCODE_F7: set_key("F7", down); break;
 828         case KEYCODE_F8: set_key("F8", down); break;
 829         case KEYCODE_F9: set_key("F9", down); break;
 830         case KEYCODE_F10: set_key("F10", down); break;
 831
 832         case KEYCODE_SPACE: set_key("SPC", down); break;
 833         case KEYCODE_BACKSPACE: set_key("BS", down); break;
 834         case KEYCODE_TAB: set_key("TAB", down); break;
 835         case KEYCODE_KP_ENTER: set_key("ENT", down); break;
 836         case KEYCODE_RETURN: set_key("RET", down); break;
 837         case KEYCODE_ESCAPE: set_key("ESC", down); break;
 838         case KEYCODE_DELETE: set_key("DEL", down); break;
 839         case KEYCODE_INSERT: set_key("HELP", down); break;
 840
 841         default: break;
 842         }
 843 }
 844
 845 void audio_sdl(float *data, int length)
 846 {
 847         int fill, s;
 848
 849         /* read sound from sound buffer
 850          * buffer pointer read and write is atomic, so no locking required!
 851          */
 852         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
 853         if (fill < length) {
 854 #ifdef DEBUG_SOUND_BUFFERING
 855                 fprintf(stderr, "sound buffer underrun\n");
 856 #endif
 857                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
 858                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
 859         }
 860         for (s = 0; s < length; s++) {
 861                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
 862                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
 863         }
 864 #ifdef DEBUG_SOUND_BUFFERING
 865         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
 866 #endif
 867         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
 868 }
 869
 870 void sound_irq(void)
 871 {
 872         /* trigger and execute IRQ 4 = sound */
 873         execute_cpu(4, NULL);
 874 }
 875
 876 int main(int argc, char *argv[])
 877 {
 878         int rc;
 879         int sdl_sound_chunk;
 880
 881         home_dir = getenv("HOME");
 882         if (!home_dir)
 883                 home_dir = "";
 884
 885         rc = parse_args(argc, argv);
 886         if (rc)
 887                 return 0;
 888
 889         /* allocate image */
 890         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
 891         if (!image) {
 892                 print_error("Failed to allocate image buffer\n");
 893                 goto done;
 894         }
 895
 896         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
 897                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
 898                 goto done;
 899         }
 900         if ((1000 % IRQ_RATE)) {
 901                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
 902                 goto done;
 903         }
 904
 905         /* calculate SDL chunk size for audio
 906          * it must be a power of two, but not more than the chunk size for each IRQ!
 907          */
 908         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
 909                 ;
 910         sdl_sound_chunk >>= 1;
 911 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
 912
 913         /* allocate sound buffers */
 914         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
 915         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
 916         if (!sound_buffer) {
 917                 print_error("Failed to allocate image buffer\n");
 918                 goto done;
 919         }
 920
 921         /* allocate memory */
 922         memory = calloc(MEMORY_SIZE, 1);
 923         if (!memory) {
 924                 print_error("Failed to allocate cpu's memory\n");
 925                 goto done;
 926         }
 927         stop_event = calloc(MEMORY_SIZE, 1);
 928         if (!stop_event) {
 929                 print_error("Failed to allocate cpu's stop_event memory\n");
 930                 goto done;
 931         }
 932         chipreg = calloc(IOSIZE, 1);
 933         if (!chipreg) {
 934                 print_error("Failed to allocate chip register\n");
 935                 goto done;
 936         }
 937
 938         /* init cpu code */
 939         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
 940
 941         /* init disk emulation */
 942         disk_init(disk_read, disk_write);
 943
 944         /* load binary */
 945         mercenary_load();
 946
 947         /* patch some stuff */
 948         mercenary_patch();
 949
 950         /* init SDL and OpenGL */
 951         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);
 952         if (rc < 0)
 953                 goto done;
 954         rc = init_opengl((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
 955         if (rc < 0)
 956                 goto done;
 957         resize_opengl((config_debug_opengl) ? SCREEN_WIDTH * 2 : SCREEN_WIDTH * 3, (config_debug_opengl) ? SCREEN_HEIGHT * 4 : SCREEN_HEIGHT * 3);
 958
 959         /* init osd */
 960         rc = init_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
 961         if (rc < 0)
 962                 goto done;
 963         rc = init_osd(1, OSD_WIDTH, OSD_HEIGHT);
 964         if (rc < 0)
 965                 goto done;
 966         help_osd = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
 967         if (!help_osd)
 968                 goto done;
 969         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
 970         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
 971                 "Emulation:\n"
 972                 "        Press `PAUSE' to toggle this help screen on or off.\n"
 973                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
 974                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
 975                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
 976                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
 977                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
 978                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
 979                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
 980                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
 981                 "\n"
 982                 "Answer to a Question:\n"
 983                 "        Press `O' (not Zero) for OK and other key for NO.\n"
 984                 "\n"
 985                 "Walking / Driving / Flying:\n"
 986                 "        Use cursor keys as joystick, to move player / craft.\n"
 987                 "        Press `R' for running, 'W' for walking speed.\n"
 988                 "        Press `B' to board, `L' to leave.\n"
 989                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
 990                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
 991                 "        Press `SPACE' to stop craft.\n"
 992                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
 993                 "        Press `T' for turbo on certain craft.\n"
 994                 "        Press `END' as joystick's fire button.\n"
 995                 "\n"
 996                 "Elevator:\n"
 997                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
 998                 "\n"
 999                 "Inside a transporter:\n"
1000                 "        Press `1'...`0' to select destination.\n"
1001                 "\n"
1002                 "Items:\n"
1003                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1004                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1005                 "        Press `NUMPAD Enter' to select certain items.\n"
1006                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1007                 "        Press `NUMPAD *' to read entry\n"
1008                 "Saving / Loading / Pause:\n"
1009                 "        Press `INSERT' to loading and saving options.\n"
1010                 "        Press `ENTER' to pause game, other key to continue.\n"
1011                 ,HELP_ALPHA, 1, 2, 5, 0);
1012         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1013         if (!info_osd)
1014                 goto done;
1015
1016         /* init audio */
1017         sound_init(SOUND_SAMPLERATE, sound_irq);
1018
1019         /* start cpu */
1020         reset_cpu();
1021
1022         if (config_skip_intro)
1023                 skip_intro();
1024
1025         /* run game */
1026         main_loop();
1027
1028 done:
1029         exit_opengl();
1030         exit_sdl();
1031
1032         if (chipreg)
1033                 free(chipreg);
1034         if (stop_event)
1035                 free(stop_event);
1036         if (memory)
1037                 free(memory);
1038         if (sound_buffer)
1039                 free(sound_buffer);
1040         if (image)
1041                 free(image);
1042         if (help_osd)
1043                 free(help_osd);
1044         if (info_osd)
1045                 free(info_osd);
1046
1047         return 0;
1048 }
1049