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 #ifdef HAVE_OVR
  28 #include "../libovr/ovr.h"
  29 #endif
  30 #include "../libsdl/opengl.h"
  31 #include "../libsdl/print.h"
  32 #include "../libcpu/m68k.h"
  33 #include "../libcpu/execute.h"
  34 #include "../libframerate/framerate.h"
  35 #include "../libvideo/video.h"
  36 #include "../libsound/sound.h"
  37 #include "../libjoystick/joystick.h"
  38 #include "../libkeyboard/keyboard.h"
  39 #include "../libdisk/disk.h"
  40 #include "../libtext/text.h"
  41 #include "mercenary.h"
  42 #include "render.h"
  43
  44 #define FOV_MIN         10.0
  45 #define FOV_NOVAGEN     64.0
  46 #define FOV_JOLLY       80.0
  47 #define FOV_MAX         170.0
  48
  49 static int config_ctrl_c = 0;
  50 static int config_amiga_speed = 0; /* fast speed */
  51 static double config_fps = 16.0;
  52 #if !defined(_WIN32)
  53 static const char *config_gamesave_dir = ".mercenary";
  54 #endif
  55 static int config_video_filter = 1;
  56 static int config_audio_filter = 1;
  57 static int config_render = 1; /* opengl render */
  58 static int config_skip_intro = 0;
  59 static int config_multisampling = 16;
  60 static double config_fov = FOV_NOVAGEN;
  61 static double config_monitor_distance = 31.5; /* inch */
  62 static double config_benson_size = 1.0;
  63 static int config_debug_transparent = 0;
  64 static int config_debug_opengl = 0;
  65 /* render improvements */
  66 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  67 static int config_improve_smooth_planets = 1;   /* set to 1 to rotate planets smoothly */
  68
  69 #define CPU_SPEED       7093790.0;
  70
  71 #define SOUND_SAMPLERATE 48000
  72 /* - game IRQ rate
  73  * - must be used for sound rendering chunk
  74  */
  75 #define IRQ_RATE        50
  76 /* numbe of buffer chunks to dejitter:
  77  * - SDL render interval
  78  * - sound rendering interval
  79  * - sound card interval
  80  * 4 should be minimum, if video rate is >=50 Hz
  81  */
  82 #define SOUND_CHUNKS    4
  83
  84 /* test sound to check if buffer does not overflow / underrun */
  85 //#define DEBUG_SOUND_BUFFERING
  86
  87 #define IOSIZE          0x1000 /* bytes in io space */
  88 #define MEMORY_SIZE     0x80000
  89 static uint8_t *memory = NULL;
  90 static uint8_t *stop_event = NULL;
  91 static uint8_t *image = NULL;
  92 static uint8_t *help_osd = NULL;
  93 static uint8_t *info_osd = NULL;
  94 static int help_view = 1;
  95 static int32_t osd_timer = 0;
  96 #ifdef HAVE_OVR
  97 #define SCREEN_WIDTH    672
  98 #define SCREEN_HEIGHT   800
  99 #else
 100 #define SCREEN_WIDTH    (320*3)
 101 #define SCREEN_HEIGHT   (200*3)
 102 #endif
 103 #define IMAGE_WIDTH     320
 104 #define IMAGE_HEIGHT    200
 105 #define BENSON_AT_LINE  136
 106 #define IMAGE_DIWSTART  0x2c
 107 #define HELP_ALPHA      0xd0
 108 #define OSD_WIDTH       320
 109 #define OSD_HEIGHT      16
 110 static uint16_t *chipreg = NULL;
 111 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 112 static int sound_buffer_size; /* buffer sample size */
 113 static int sound_buffer_writep; /* write pointer at buffer */
 114 static int sound_buffer_readp; /* read pointer at buffer */
 115 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 116 static double benson_size; /* render size of benson */
 117 static int render_legacy = 0; /* render original amiga screen, if set */
 118 static int render_improved = 0; /* render improved image, if set */
 119 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 120 static int intro_skipped = 0; /* indicated if we already have landed */
 121 static int window_width, window_height;
 122
 123 static const char *home_dir;
 124
 125 static int quit = 0;
 126
 127 int parse_args(int argc, char *argv[])
 128 {
 129         int i = 1;
 130
 131         while (argc > i) {
 132                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 133                         print_info("Usage: %s\n", argv[0]);
 134                         print_info(" -s --render-speed original | fast\n");
 135                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 136                         print_info("    --fps <fps>\n");
 137                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 138                         print_info(" -v --video-filter on | off\n");
 139                         print_info("        Set video filter.\n");
 140                         print_info(" -a --audio-filter on | off\n");
 141                         print_info("        Set audio filter.\n");
 142                         print_info(" -r --render original | opengl\n");
 143                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 144                         print_info(" -b --benson normal | half\n");
 145                         print_info("        Size of 'Benson' (control panel).\n");
 146                         print_info(" -m --multisampling <samples>\n");
 147                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 148                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 149                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 150                         print_info(" -i --skip-intro\n");
 151                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 152                         print_info("Debug options:\n");
 153                         print_info(" -o --debug-opengl\n");
 154                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 155                         print_info("    --debug-transparent\n");
 156                         print_info("        Draw all things half transparent.\n");
 157                         print_info("    --ctrl-c\n");
 158                         print_info("        Use CTRL+C to exit game (used for development)\n");
 159                         return -1;
 160                 } else
 161                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 162                         i++;
 163                         if (argc == i) {
 164 missing_parameter:
 165                                 print_info("Missing parameter, use '--help'!\n");
 166                                 return -1;
 167                         }
 168                         if (!strcmp(argv[i], "original"))
 169                                 config_amiga_speed = 1;
 170                         else
 171                         if (!strcmp(argv[i], "fast"))
 172                                 config_amiga_speed = 0;
 173                         else {
 174 illegal_parameter:
 175                                 print_info("Illegal parameter, use '--help'!\n");
 176                                 return -1;
 177                         }
 178                 } else
 179                 if (!strcmp(argv[i], "--fps")) {
 180                         i++;
 181                         if (argc == i)
 182                                 goto missing_parameter;
 183                         config_fps = atof(argv[i]);
 184                         if (config_fov <= 0.0)
 185                                 goto illegal_parameter;
 186                 } else
 187                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 188                         i++;
 189                         if (argc == i)
 190                                 goto missing_parameter;
 191                         if (!strcmp(argv[i], "on"))
 192                                 config_video_filter = 1;
 193                         else
 194                         if (!strcmp(argv[i], "off"))
 195                                 config_video_filter = 0;
 196                         else
 197                                 goto illegal_parameter;
 198                 } else
 199                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 200                         i++;
 201                         if (argc == i)
 202                                 goto missing_parameter;
 203                         if (!strcmp(argv[i], "on"))
 204                                 config_audio_filter = 1;
 205                         else
 206                         if (!strcmp(argv[i], "off"))
 207                                 config_audio_filter = 0;
 208                         else
 209                                 goto illegal_parameter;
 210                 } else
 211                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 212                         i++;
 213                         if (argc == i)
 214                                 goto missing_parameter;
 215                         if (!strcmp(argv[i], "original"))
 216                                 config_render = 0;
 217                         else
 218                         if (!strcmp(argv[i], "opengl"))
 219                                 config_render = 1;
 220                         else
 221                                 goto illegal_parameter;
 222                 } else
 223                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 224                         i++;
 225                         if (argc == i)
 226                                 goto missing_parameter;
 227                         if (!strcmp(argv[i], "normal"))
 228                                 config_benson_size = 1.0;
 229                         else
 230                         if (!strcmp(argv[i], "half")) {
 231                                 config_benson_size = 0.5;
 232                                 if (config_fov == FOV_NOVAGEN)
 233                                         config_fov = FOV_JOLLY;
 234                         } else
 235                                 goto illegal_parameter;
 236                 } else
 237                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 238                         i++;
 239                         if (argc == i)
 240                                 goto missing_parameter;
 241                         config_multisampling = atoi(argv[i]);
 242                 } else
 243                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 244                         i++;
 245                         if (argc == i)
 246                                 goto missing_parameter;
 247                         config_fov = atof(argv[i]);
 248                         if (config_fov < 1.0 || config_fov > 179.0)
 249                                 goto illegal_parameter;
 250                 } else
 251                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 252                         config_skip_intro = 1;
 253                 } else
 254                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 255                         config_debug_opengl = 1;
 256                 } else
 257                 if (!strcmp(argv[i], "--debug-transparent")) {
 258                         config_debug_transparent = 1;
 259                 } else
 260                 if (!strcmp(argv[i], "--ctrl-c")) {
 261                         config_ctrl_c = 1;
 262                 } else {
 263                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 264                         return -1;
 265                 }
 266                 i++;
 267         }
 268
 269         return 0;
 270 }
 271
 272 static void resize_window(int width, int height)
 273 {
 274         window_width = width;
 275         window_height = height;
 276 }
 277
 278 static void skip_intro(void)
 279 {
 280         int event;
 281         double render_delay = 0.0;
 282         double cycle_count;
 283
 284         if (intro_skipped)
 285                 return;
 286
 287         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 288         do {
 289                 /* render, if not delayed */
 290                 if (render_delay <= 0.0) {
 291                         cycle_count = 0;
 292                         do {
 293                                 cycle_count += execute_cpu(0, &event);
 294                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 295                         render_delay += (double)cycle_count / CPU_SPEED;
 296                 }
 297                 /* VBL */
 298                 execute_cpu(3, NULL);
 299                 /* count down render delay */
 300                 if (render_delay) {
 301                         render_delay -= 1.0 / (double)IRQ_RATE;
 302                         if (render_delay < 0.0)
 303                                 render_delay = 0.0;
 304                 }
 305         } while (event != STOP_AT_CLEAR_SCREEN1);
 306
 307         intro_skipped = 1;
 308 }
 309
 310 static void special_event(int event)
 311 {
 312         if (render_improved)
 313                 render_capture_event(event);
 314 }
 315
 316 static void main_loop(void)
 317 {
 318         double frame_step, frame_time = 0.0, frame_render = 1;
 319         int had_first_irq = 0;
 320         static uint32_t current_time, last_time = 0, diff;
 321         int i, rc;
 322         int space, length;
 323         int cycle_count, event = STOP_AT_END;
 324         double render_delay = 0.0;
 325         uint32_t palette_address;
 326         uint16_t palette[16];
 327         int eye;
 328
 329         last_time = ticks_sdl();
 330
 331         /* render result on window */
 332         while (!quit) {
 333                 /* if we are in interstellar fligt, we use 50 Hz */
 334                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 335                 /* else we use whatever frame rate the user wants */
 336                 if (render_capture_is_interstellar())
 337                         frame_step = vbl_duration * 50.0;
 338                 else if (!intro_skipped)
 339                         frame_step = vbl_duration * 10.0;
 340                 else
 341                         frame_step = vbl_duration * config_fps;
 342                 if (frame_step > 1.0)
 343                         frame_step = 1.0;
 344                 /* handle SDL events */
 345                 rc = event_sdl();
 346                 if (rc)
 347                         break;
 348
 349                 /* initialize rendering */
 350                 debug_opengl = config_debug_opengl;
 351                 benson_size = config_benson_size;
 352                 render_legacy = (!config_render) || debug_opengl;
 353                 render_improved = config_render || debug_opengl;
 354                 if (!render_improved) {
 355                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 356                         render_capture_reset();
 357                 }
 358                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 359                 /* amgia speed: don't render if we still delay */
 360                 /* non amiga speed: render if we need a new frame */
 361                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 362                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 363                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 364                 if (((frame_render && !config_amiga_speed)
 365                   || (config_amiga_speed && render_delay <= 0.0)
 366                   || event == STOP_AT_WAIT_INPUT)
 367                 && !(had_first_irq && help_view)) {
 368                         frame_render = 0;
 369                         /* start capturing for improved graphics */
 370                         if (render_improved)
 371                                 render_capture_start(config_fov, config_improve_extend_roads, config_improve_smooth_planets, config_debug_transparent);
 372
 373                         /* execute until the rendered image is ready (wait for VBL) */
 374                         cycle_count = 0;
 375                         do {
 376                                 cycle_count += execute_cpu(0, &event);
 377                                 /* handle special events */
 378                                 special_event(event);
 379                                 if (event == STOP_AT_CLEAR_SCREEN1)
 380                                         intro_skipped = 1;
 381                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 382                         /* stop capturing for improved graphics */
 383                         if (render_improved)
 384                                 render_capture_stop();
 385                         /* copy palette */
 386                         palette_address = mercenary_palette_view();
 387                         for (i = 0; i < 16; i++)
 388                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 389                         /* for amiga speed: set delay by the number of cycles */
 390                         if (config_amiga_speed)
 391                                 render_delay += (double)cycle_count / CPU_SPEED;
 392                 }
 393
 394                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 395 #ifdef HAVE_OVR
 396                 begin_render_ovr();
 397                 for (eye = 0; eye < 2; eye++) {
 398                         /* viewport and frustum is set here */
 399                         begin_render_ovr_eye(eye);
 400 #else
 401                 eye = 0;
 402                 {
 403 #endif
 404                         /* clear screen */
 405 #ifdef HAVE_OVR
 406                         opengl_clear(1);
 407 #else
 408                         opengl_clear(0);
 409 #endif
 410                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 411                         if (render_improved) {
 412 #ifndef HAVE_OVR
 413                                 /* viewport and frustum is set here */
 414                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 415 #endif
 416                                 /* render improved graphics, interpolate, if required,
 417                                  * if no item list is available, for legacy rendering
 418                                  */
 419 #ifdef HAVE_OVR
 420                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 1);
 421 #else
 422                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 0);
 423 #endif
 424                                 if (rc)
 425                                         goto goto_legacy;
 426                                 opengl_blit_image(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, 1, config_fov, config_monitor_distance, benson_size);
 427                                 if (help_view)
 428                                         opengl_blit_osd(0, help_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, benson_size, 1.0, 1.0, 0.0, 0.0);
 429                                 if (osd_timer) {
 430                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, benson_size, 0.5, 0.04, 0.5, -0.95);
 431                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 432                                                 osd_timer = 0;
 433                                 }
 434                         }
 435                         /* setup viewport for legacy image and render image, if enabled */
 436                         /* also render legacy, if render_improved failed due to not (yet) available items */
 437                         if (render_legacy) {
 438                                 goto_legacy:
 439                                 /* render game view without benson
 440                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 441                                  */
 442                                 if (had_first_irq)
 443                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 444 #ifndef HAVE_OVR
 445                                 /* viewport and frustum is set here */
 446                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, 1.0);
 447 #endif
 448                                 opengl_blit_image(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, 0, config_fov, config_monitor_distance, 1.0);
 449                                 if (help_view)
 450                                         opengl_blit_osd(0, help_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, 1.0, 1.0, 1.0, 0.0, 0.0);
 451                                 if (osd_timer) {
 452                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, 1.0, 0.5, 0.04, 0.5, -0.95);
 453                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 454                                                 osd_timer = 0;
 455                                 }
 456                         }
 457 #ifdef HAVE_OVR
 458                         end_render_ovr_eye(eye);
 459                 }
 460                 /* at this point we are ready with our image, so we display */
 461                 end_render_ovr();
 462                 render_mirror_ovr(window_width, window_height);
 463 #else
 464                 }
 465 #endif
 466                 swap_sdl();
 467
 468                 /* advance frame time, if we are not in help view  */
 469                 if (!(had_first_irq && help_view)) {
 470                         frame_time += frame_step;
 471                         if (frame_time >= 1.0) {
 472                                 frame_time -= 1.0;
 473                                 frame_render = 1;
 474                         }
 475                 }
 476
 477                 /* measure frame rate */
 478                 framerate_measure();
 479
 480                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 481                 /* only do this, if we are not in help view */
 482                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 483                 if (!(had_first_irq && help_view)) {
 484                         current_time = ticks_sdl();
 485                         diff = current_time - last_time;
 486                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 487                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 488                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 489                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 490                         }
 491                         while (diff > 1000 / IRQ_RATE) {
 492                                 /* trigger and execute IRQ 3 = VBL */
 493                                 execute_cpu(3, NULL);
 494                                 had_first_irq = 1;
 495                                 /* transfer benson without game view
 496                                  * because we only got benson refreshed during VBL IRQ
 497                                  */
 498                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 499                                 /* render sound to sound buffer
 500                                  * buffer pointer read and write is atomic, so no locking required!
 501                                  */
 502                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 503                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 504 #ifdef DEBUG_SOUND_BUFFERING
 505                                         fprintf(stderr, "sound buffer overflow\n");
 506 #endif
 507                                         length = space;
 508                                 } else
 509                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 510 #ifdef DEBUG_SOUND_BUFFERING
 511                                 printf("can write %d, write %d\n", space, length);
 512                                 static int cnt = 0;
 513                                 int s;
 514                                 for (s = 0; s < length; s++) {
 515                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 516                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 517                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 518                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 519                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 520                                          cnt++;
 521                                 }
 522 #else
 523                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 524 #endif
 525                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 526                                 diff -= 1000 / IRQ_RATE;
 527                                 last_time += 1000 / IRQ_RATE;
 528
 529                                 /* count down render delay */
 530                                 if (render_delay) {
 531                                         render_delay -= 1.0 / (double)IRQ_RATE;
 532                                         if (render_delay < 0.0)
 533                                                 render_delay = 0.0;
 534                                 }
 535                         }
 536                 }
 537         }
 538 }
 539
 540 static uint16_t io_read(uint32_t address)
 541 {
 542         uint16_t value = 0xffff;
 543
 544         /* joystick and fire button */
 545         if (address == 0xbfe000 || address == 0xdff00c)
 546                 value &= emulate_joystick_read(address);
 547         /* keyboard */
 548         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 549                 value &= emulate_keyboard_read(address);
 550         /* diskette */
 551         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 552                 value &= emulate_disk_read(address);
 553
 554         return value;
 555 }
 556
 557 static void io_write(uint32_t address, uint16_t value)
 558 {
 559         /* dmacon and sound registers */
 560         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 561                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 562         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 563                 emulate_disk_write(address, value);
 564 }
 565
 566 /* two tracks with 0x1820 words of length */
 567 static uint8_t game_save[2][0x1820 << 1];
 568 static int last_track = 0;
 569
 570 /* game reads track with saved game */
 571 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 572 {
 573         if (length > sizeof(game_save[0])) {
 574                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 575                 return;
 576         }
 577
 578         /* if even track is selected, load game */
 579         if (!(track & 1)) {
 580                 char filename[256];
 581                 int gamesave_num = (track - 2) >> 1;
 582                 int got;
 583                 FILE *fp;
 584
 585                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 586 #if defined(_WIN32)
 587                 filename[0] = '\0';
 588 #else
 589                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 590                 mkdir(filename, 0777);
 591 #endif
 592                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 593                 fp = fopen(filename, "r");
 594                 if (!fp) {
 595 fail:
 596                         print_info("failed to load game from '%s'\n", filename);
 597                         goto copy;
 598                 }
 599                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 600                 fclose(fp);
 601                 if (got != 2)
 602                         goto fail;
 603         }
 604
 605 copy:
 606         /* copy track */
 607         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 608 }
 609
 610 /* game writes track with saved game */
 611 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 612 {
 613         /* skip sync info that is provided by game and only relevant for a real disk track */
 614         data += 0x200;
 615         length -= 0x200;
 616
 617         if (length != sizeof(game_save[0])) {
 618                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 619                 return;
 620         }
 621
 622         /* don't save if last track is the same, because disk is written on both sides with the same data */
 623         if (track == last_track) {
 624                 if (memcmp(memory + data, game_save[track & 1], length)) {
 625                         print_error("saving game data on other side of the disk is different, please fix!\n");
 626                 }
 627                 return;
 628         }
 629         last_track = track;
 630
 631         /* save game data */
 632         memcpy(game_save[track & 1], memory + data, length);
 633
 634         /* if done with saving */
 635         if ((track & 1)) {
 636                 char filename[256];
 637                 int gamesave_num = (track - 2) >> 1;
 638                 int wrote;
 639                 FILE *fp;
 640
 641 #if defined(_WIN32)
 642                 filename[0] = '\0';
 643 #else
 644                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 645                 mkdir(filename, 0777);
 646 #endif
 647                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 648                 fp = fopen(filename, "w");
 649                 if (!fp) {
 650 fail:
 651                         print_error("failed to save game to '%s'\n", filename);
 652                         return;
 653                 }
 654                 print_info("Game state saved to '%s'\n", filename);
 655                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 656                 fclose(fp);
 657                 if (wrote != 2)
 658                         goto fail;
 659         }
 660 }
 661
 662 static void osd_info(const char *param, const char *value)
 663 {
 664         char line[41] = "                                        ";
 665
 666         if (param[0]) {
 667                 strncpy(line + 21 - strlen(param), param, strlen(param));
 668                 line[22] = ':';
 669         }
 670         if (strlen(value) > 15) {
 671                 print_error("string too long\n");
 672                 return;
 673         }
 674         strncpy(line + 25, value, strlen(value));
 675         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 676         osd_timer = ticks_sdl() + 2500;
 677 }
 678
 679 static int shift = 0, ctrl = 0;
 680
 681 static void keyboard_sdl(int down, enum keycode keycode)
 682 {
 683         switch (keycode) {
 684         case KEYCODE_LCTRL:
 685         case KEYCODE_RCTRL:
 686                 ctrl = down;
 687                 break;
 688         default: break;
 689         }
 690
 691         if (ctrl && down) {
 692                 switch (keycode) {
 693                 case KEYCODE_h:
 694                         help_view ^= 1;
 695                         break;
 696                 case KEYCODE_v:
 697                         config_video_filter ^= 1;
 698                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 699                         break;
 700                 case KEYCODE_a:
 701                         config_audio_filter ^= 1;
 702                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 703                         break;
 704                 case KEYCODE_s:
 705                         config_amiga_speed ^= 1;
 706                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 707                         break;
 708                 case KEYCODE_r:
 709                         config_render ^= 1;
 710                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 711                         break;
 712                 case KEYCODE_b:
 713                         if (!config_render && !config_debug_opengl) {
 714                                 osd_info("", "not applicable");
 715                                 break;
 716                         }
 717                         if (config_benson_size == 0.5) {
 718                                 config_benson_size = 1.0;
 719                                 config_fov = FOV_NOVAGEN;
 720                         } else {
 721                                 config_benson_size = 0.5;
 722                                 config_fov = FOV_JOLLY;
 723                         }
 724                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 725                         break;
 726                 case KEYCODE_i:
 727                         if (!intro_skipped)
 728                                 skip_intro();
 729                         else
 730                                 osd_info("", "not applicable");
 731                         break;
 732                 case KEYCODE_c:
 733                         if (config_ctrl_c)
 734                                 quit = 1;
 735                         break;
 736                 case KEYCODE_n:
 737 #ifdef HAVE_OVR
 738                         normalize_observer_ovr();
 739                         osd_info("", "change height");
 740 #else
 741                         osd_info("", "not applicable");
 742 #endif
 743                         break;
 744                 case KEYCODE_KP_PLUS:
 745                         if (config_fov / 1.2 >= FOV_MIN)
 746                                 config_fov /= 1.2;
 747                         disp_fov:
 748                         {
 749                                 char text[16];
 750                                 sprintf(text, "%.2f", config_fov);
 751                                 osd_info("FOV", text);
 752                         }
 753                         break;
 754                 case KEYCODE_KP_MINUS:
 755                         if (config_fov * 1.2 <= FOV_MAX)
 756                                 config_fov *= 1.2;
 757                         goto disp_fov;
 758                 default: break;
 759                 }
 760                 /* do not pass keys to game while holding CTRL */
 761                 return;
 762         }
 763
 764         if (keycode == KEYCODE_PAUSE && down)
 765                 help_view ^= 1;
 766
 767         /* in help view we don't need to forward keypresses */
 768         if (help_view)
 769                 return;
 770
 771         switch (keycode) {
 772         case KEYCODE_LSHIFT:
 773                 set_key("LSH", down);
 774                 shift = down;
 775                 break;
 776         case KEYCODE_RSHIFT:
 777                 set_key("RSH", down);
 778                 shift = down;
 779                 break;
 780         case KEYCODE_LEFT:
 781                 if (shift && down) {
 782                         set_key("LF", down);
 783                         set_joystick(-1, -1, -1, -1, -1);
 784                         break;
 785                 }
 786                 set_key("LF", 0);
 787                 set_joystick(down, -1, -1, -1, -1);
 788                 break;
 789         case KEYCODE_RIGHT:
 790                 if (shift && down) {
 791                         set_key("RT", down);
 792                         set_joystick(-1, -1, -1, -1, -1);
 793                         break;
 794                 }
 795                 set_key("RT", 0);
 796                 set_joystick(-1, down, -1, -1, -1);
 797                 break;
 798         case KEYCODE_UP:
 799                 if (shift && down) {
 800                         set_key("UP", down);
 801                         set_joystick(-1, -1, -1, -1, -1);
 802                         break;
 803                 }
 804                 set_key("UP", 0);
 805                 set_joystick(-1, -1, down, -1, -1);
 806                 break;
 807         case KEYCODE_DOWN:
 808                 if (shift && down) {
 809                         set_key("DN", down);
 810                         set_joystick(-1, -1, -1, -1, -1);
 811                         break;
 812                 }
 813                 set_key("DN", 0);
 814                 set_joystick(-1, -1, -1, down, -1);
 815                 break;
 816         case KEYCODE_END:
 817                 set_joystick(-1, -1, -1, -1, down);
 818                 break;
 819
 820         case KEYCODE_a: set_key("A", down); break;
 821         case KEYCODE_b: set_key("B", down); break;
 822         case KEYCODE_c: set_key("C", down); break;
 823         case KEYCODE_d: set_key("D", down); break;
 824         case KEYCODE_e: set_key("E", down); break;
 825         case KEYCODE_f: set_key("F", down); break;
 826         case KEYCODE_g: set_key("G", down); break;
 827         case KEYCODE_h: set_key("H", down); break;
 828         case KEYCODE_i: set_key("I", down); break;
 829         case KEYCODE_j: set_key("J", down); break;
 830         case KEYCODE_k: set_key("K", down); break;
 831         case KEYCODE_l: set_key("L", down); break;
 832         case KEYCODE_m: set_key("M", down); break;
 833         case KEYCODE_n: set_key("N", down); break;
 834         case KEYCODE_o: set_key("O", down); break;
 835         case KEYCODE_p: set_key("P", down); break;
 836         case KEYCODE_q: set_key("Q", down); break;
 837         case KEYCODE_r: set_key("R", down); break;
 838         case KEYCODE_s: set_key("S", down); break;
 839         case KEYCODE_t: set_key("T", down); break;
 840         case KEYCODE_u: set_key("U", down); break;
 841         case KEYCODE_v: set_key("V", down); break;
 842         case KEYCODE_w: set_key("W", down); break;
 843         case KEYCODE_x: set_key("X", down); break;
 844         case KEYCODE_y: set_key("Y", down); break;
 845         case KEYCODE_z: set_key("Z", down); break;
 846
 847         case KEYCODE_0: set_key("0", down); break;
 848         case KEYCODE_1: set_key("1", down); break;
 849         case KEYCODE_2: set_key("2", down); break;
 850         case KEYCODE_3: set_key("3", down); break;
 851         case KEYCODE_4: set_key("4", down); break;
 852         case KEYCODE_5: set_key("5", down); break;
 853         case KEYCODE_6: set_key("6", down); break;
 854         case KEYCODE_7: set_key("7", down); break;
 855         case KEYCODE_8: set_key("8", down); break;
 856         case KEYCODE_9: set_key("9", down); break;
 857
 858         case KEYCODE_KP_0: set_key("NP0", down); break;
 859         case KEYCODE_KP_1: set_key("NP1", down); break;
 860         case KEYCODE_KP_2: set_key("NP2", down); break;
 861         case KEYCODE_KP_3: set_key("NP3", down); break;
 862         case KEYCODE_KP_4: set_key("NP4", down); break;
 863         case KEYCODE_KP_5: set_key("NP5", down); break;
 864         case KEYCODE_KP_6: set_key("NP6", down); break;
 865         case KEYCODE_KP_7: set_key("NP7", down); break;
 866         case KEYCODE_KP_8: set_key("NP8", down); break;
 867         case KEYCODE_KP_9: set_key("NP9", down); break;
 868         case KEYCODE_KP_DIVIDE: set_key("NPDIV", down); break;
 869         case KEYCODE_KP_MULTIPLY: set_key("NPMUL", down); break;
 870         case KEYCODE_KP_MINUS: set_key("NPSUB", down); break;
 871         case KEYCODE_KP_PLUS: set_key("NPADD", down); break;
 872         case KEYCODE_KP_PERIOD: set_key("NPDEL", down); break;
 873         // NPLPAREN and NPRPAREN are not emulated
 874
 875         case KEYCODE_F1: set_key("F1", down); break;
 876         case KEYCODE_F2: set_key("F2", down); break;
 877         case KEYCODE_F3: set_key("F3", down); break;
 878         case KEYCODE_F4: set_key("F4", down); break;
 879         case KEYCODE_F5: set_key("F5", down); break;
 880         case KEYCODE_F6: set_key("F6", down); break;
 881         case KEYCODE_F7: set_key("F7", down); break;
 882         case KEYCODE_F8: set_key("F8", down); break;
 883         case KEYCODE_F9: set_key("F9", down); break;
 884         case KEYCODE_F10: set_key("F10", down); break;
 885
 886         case KEYCODE_SPACE: set_key("SPC", down); break;
 887         case KEYCODE_BACKSPACE: set_key("BS", down); break;
 888         case KEYCODE_TAB: set_key("TAB", down); break;
 889         case KEYCODE_KP_ENTER: set_key("ENT", down); break;
 890         case KEYCODE_RETURN: set_key("RET", down); break;
 891         case KEYCODE_ESCAPE: set_key("ESC", down); break;
 892         case KEYCODE_DELETE: set_key("DEL", down); break;
 893         case KEYCODE_INSERT: set_key("HELP", down); break;
 894
 895         default: break;
 896         }
 897 }
 898
 899 void audio_sdl(float *data, int length)
 900 {
 901         int fill, s;
 902
 903         /* read sound from sound buffer
 904          * buffer pointer read and write is atomic, so no locking required!
 905          */
 906         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
 907         if (fill < length) {
 908 #ifdef DEBUG_SOUND_BUFFERING
 909                 fprintf(stderr, "sound buffer underrun\n");
 910 #endif
 911                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
 912                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
 913         }
 914         for (s = 0; s < length; s++) {
 915                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
 916                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
 917         }
 918 #ifdef DEBUG_SOUND_BUFFERING
 919         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
 920 #endif
 921         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
 922 }
 923
 924 void sound_irq(void)
 925 {
 926         /* trigger and execute IRQ 4 = sound */
 927         execute_cpu(4, NULL);
 928 }
 929
 930 int main(int argc, char *argv[])
 931 {
 932         int rc;
 933         int sdl_sound_chunk;
 934
 935         home_dir = getenv("HOME");
 936         if (!home_dir)
 937                 home_dir = "";
 938
 939         rc = parse_args(argc, argv);
 940         if (rc)
 941                 return 0;
 942
 943         /* allocate image */
 944         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
 945         if (!image) {
 946                 print_error("Failed to allocate image buffer\n");
 947                 goto done;
 948         }
 949
 950         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
 951                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
 952                 goto done;
 953         }
 954         if ((1000 % IRQ_RATE)) {
 955                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
 956                 goto done;
 957         }
 958
 959         /* calculate SDL chunk size for audio
 960          * it must be a power of two, but not more than the chunk size for each IRQ!
 961          */
 962         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
 963                 ;
 964         sdl_sound_chunk >>= 1;
 965 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
 966
 967         /* allocate sound buffers */
 968         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
 969         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
 970         if (!sound_buffer) {
 971                 print_error("Failed to allocate image buffer\n");
 972                 goto done;
 973         }
 974
 975         /* allocate memory */
 976         memory = calloc(MEMORY_SIZE, 1);
 977         if (!memory) {
 978                 print_error("Failed to allocate cpu's memory\n");
 979                 goto done;
 980         }
 981         stop_event = calloc(MEMORY_SIZE, 1);
 982         if (!stop_event) {
 983                 print_error("Failed to allocate cpu's stop_event memory\n");
 984                 goto done;
 985         }
 986         chipreg = calloc(IOSIZE, 1);
 987         if (!chipreg) {
 988                 print_error("Failed to allocate chip register\n");
 989                 goto done;
 990         }
 991
 992         /* init cpu code */
 993         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
 994
 995         /* init disk emulation */
 996         disk_init(disk_read, disk_write);
 997
 998         /* load binary */
 999         mercenary_load();
1000
1001         /* patch some stuff */
1002         mercenary_patch();
1003
1004         /* init SDL and OpenGL */
1005 #ifdef HAVE_OVR
1006         int vbl_sync = 0;
1007         int rift = 1;
1008         window_width = SCREEN_WIDTH;
1009         window_height = SCREEN_HEIGHT;
1010 #else
1011         int vbl_sync = 1;
1012         int rift = 0;
1013         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1014         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1015 #endif
1016         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, config_multisampling, vbl_sync, rift);
1017         if (rc < 0)
1018                 goto done;
1019 #ifdef HAVE_OVR
1020         rc = init_ovr();
1021         if (rc < 0)
1022                 goto done;
1023 #endif
1024         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1025         if (rc < 0)
1026                 goto done;
1027
1028         /* init osd */
1029         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1030         if (rc < 0)
1031                 goto done;
1032         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1033         if (rc < 0)
1034                 goto done;
1035         help_osd = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1036         if (!help_osd)
1037                 goto done;
1038         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
1039         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1040                 "Emulation:\n"
1041                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1042                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1043                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1044                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1045                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1046                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1047                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1048                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1049                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1050 #ifdef HAVE_OVR
1051                 "        Press `CTRL' + `N' to normalize player position.\n"
1052 #endif
1053                 "\n"
1054                 "Answer to a Question:\n"
1055                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1056                 "\n"
1057                 "Walking / Driving / Flying:\n"
1058                 "        Use cursor keys as joystick, to move player / craft.\n"
1059                 "        Press `R' for running, 'W' for walking speed.\n"
1060                 "        Press `B' to board, `L' to leave.\n"
1061                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1062                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1063                 "        Press `SPACE' to stop craft.\n"
1064                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1065                 "        Press `T' for turbo on certain craft.\n"
1066                 "        Press `END' as joystick's fire button.\n"
1067                 "\n"
1068                 "Elevator:\n"
1069                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1070                 "\n"
1071                 "Inside a transporter:\n"
1072                 "        Press `1'...`0' to select destination.\n"
1073                 "\n"
1074                 "Items:\n"
1075                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1076                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1077                 "        Press `NUMPAD Enter' to select certain items.\n"
1078                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1079                 "        Press `NUMPAD *' to read entry\n"
1080                 "Saving / Loading / Pause:\n"
1081                 "        Press `INSERT' to loading and saving options.\n"
1082                 "        Press `ENTER' to pause game, other key to continue.\n"
1083                 ,HELP_ALPHA, 1, 2, 5, 0);
1084         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1085         if (!info_osd)
1086                 goto done;
1087
1088         /* init audio */
1089         sound_init(SOUND_SAMPLERATE, sound_irq);
1090
1091         /* start cpu */
1092         reset_cpu();
1093
1094         if (config_skip_intro)
1095                 skip_intro();
1096
1097         /* run game */
1098         main_loop();
1099
1100 done:
1101         exit_opengl();
1102 #ifdef HAVE_OVR
1103         exit_ovr();
1104 #endif
1105         exit_sdl();
1106
1107         if (chipreg)
1108                 free(chipreg);
1109         if (stop_event)
1110                 free(stop_event);
1111         if (memory)
1112                 free(memory);
1113         if (sound_buffer)
1114                 free(sound_buffer);
1115         if (image)
1116                 free(image);
1117         if (help_osd)
1118                 free(help_osd);
1119         if (info_osd)
1120                 free(info_osd);
1121
1122         return 0;
1123 }
1124