3 * (C) 2018 by Andreas Eversberg <jolly@eversberg.eu>
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.
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.
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/>.
24 #include <sys/types.h>
25 #include "../libsdl/sdl.h"
26 #include "../libsdl/opengl.h"
27 #include "../libsdl/print.h"
28 #include "../libcpu/m68k.h"
29 #include "../libcpu/execute.h"
30 #include "../libvideo/video.h"
31 #include "../libsound/sound.h"
32 #include "../libjoystick/joystick.h"
33 #include "../libkeyboard/keyboard.h"
34 #include "../libdisk/disk.h"
35 #include "mercenary.h"
37 static int config_amiga_speed = 1;
38 static const char *config_gamesave_dir = ".mercenary";
39 static int config_video_filter = 1;
40 static int config_audio_filter = 1;
42 #define CPU_SPEED 7093790.0;
44 #define SOUND_SAMPLERATE 48000
46 * - must be used for sound rendering chunk
49 /* numbe of buffer chunks to dejitter:
50 * - SDL render interval
51 * - sound rendering interval
52 * - sound card interval
53 * 4 should be minimum, if video rate is >=50 Hz
55 #define SOUND_CHUNKS 4
57 /* test sound to check if buffer does not overflow / underrun */
58 //#define DEBUG_SOUND_BUFFERING
60 #define IOSIZE 0x1000 /* bytes in io space */
61 #define MEMORY_SIZE 0x80000
62 static uint8_t *memory = NULL;
63 static uint8_t *image = NULL;
64 #define SCREEN_WIDTH (320*3)
65 #define SCREEN_HEIGHT (200*3)
66 #define IMAGE_WIDTH 320
67 #define IMAGE_HEIGHT 200
68 #define BENSON_AT_LINE 136
69 #define IMAGE_DIWSTART 0x2c
70 static uint16_t *chipreg = NULL;
71 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
72 static int sound_buffer_size; /* buffer sample size */
73 static int sound_buffer_writep; /* write pointer at buffer */
74 static int sound_buffer_readp; /* read pointer at buffer */
75 static int double_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
77 static const char *home_dir;
81 int parse_args(int argc, char *argv[])
86 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
87 print_info("Usage: %s\n", argv[0]);
88 print_info(" -s --amiga-speed original | full\n");
89 print_info(" Set speed of rendering to original Amiga or full speed.\n");
90 print_info(" -v --video-filter on | off\n");
91 print_info(" Set video filter.\n");
92 print_info(" -a --audio-filter on | off\n");
93 print_info(" Set audio filter.\n");
96 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--amiga-speed")) {
100 print_info("Missing parameter, use '--help'!\n");
103 if (!strcmp(argv[i], "original"))
104 config_amiga_speed = 1;
106 if (!strcmp(argv[i], "full"))
107 config_amiga_speed = 0;
110 print_info("Illegal parameter, use '--help'!\n");
114 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
117 goto missing_parameter;
118 if (!strcmp(argv[i], "on"))
119 config_video_filter = 1;
121 if (!strcmp(argv[i], "off"))
122 config_video_filter = 0;
124 goto illegal_parameter;
126 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
129 goto missing_parameter;
130 if (!strcmp(argv[i], "on"))
131 config_audio_filter = 1;
133 if (!strcmp(argv[i], "off"))
134 config_audio_filter = 0;
136 goto illegal_parameter;
138 print_info("Illegal option '%s', use '--help'!\n", argv[i]);
147 static void special_event(int event)
151 static void main_loop(void)
153 int had_first_irq = 0;
154 static uint32_t current_time, last_time = 0, diff;
157 int cycle_count, event;
158 double render_delay = 0.0;
159 uint32_t palette_address;
160 uint16_t palette[16];
162 last_time = SDL_GetTicks();
164 /* render result on window */
166 /* STEP 1: let the CPU render/process the game */
167 /* don't render if we still delay */
169 /* execute until the rendered image is ready (wait for VBL) */
172 cycle_count += execute_cpu(0, mercenary_stop_at, &event);
173 /* handle special events */
174 if (event != STOP_AT_WAIT_VBL)
175 special_event(event);
176 } while (event != STOP_AT_WAIT_VBL);
178 palette_address = mercenary_palette();
179 for (i = 0; i < 16; i++)
180 palette[i] = m68k_read_memory_16(palette_address + i*2);
181 /* for amiga speed: set delay by the number of cycles */
182 if (config_amiga_speed)
183 render_delay = (double)cycle_count / CPU_SPEED;
186 /* STEP 2: render image in memory via OpenGL */
188 /* render game view without benson
189 * because benson is not updated before VBL IRQ, we don't want old image from double buffer
191 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_size);
196 render_opengl(image, config_video_filter);
199 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
200 current_time = SDL_GetTicks();
201 diff = current_time - last_time;
202 /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
203 if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
204 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
205 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
207 while (diff > 1000 / IRQ_RATE) {
208 execute_cpu(3, NULL, NULL);
209 execute_cpu(4, NULL, NULL);
211 /* render benson without game view
212 * because we only got benson refreshed during VBL IRQ
214 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_size);
215 /* render sound to sound buffer
216 * buffer pointer read and write is atomic, so no locking required!
218 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
219 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
220 #ifdef DEBUG_SOUND_BUFFERING
221 fprintf(stderr, "sound buffer overflow\n");
225 length = SOUND_SAMPLERATE / IRQ_RATE;
226 #ifdef DEBUG_SOUND_BUFFERING
227 printf("can write %d, write %d\n", space, length);
230 for (s = 0; s < length; s++) {
231 sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
232 sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
233 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
234 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
235 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
239 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
241 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
242 diff -= 1000 / IRQ_RATE;
243 last_time += 1000 / IRQ_RATE;
245 /* count down render delay */
247 render_delay -= 1.0 / (double)IRQ_RATE;
248 if (render_delay < 0.0)
255 static uint16_t io_read(uint32_t address)
257 uint16_t value = 0xffff;
259 /* joystick and fire button */
260 if (address == 0xbfe000 || address == 0xdff00c)
261 value &= emulate_joystick_read(address);
263 if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
264 value &= emulate_keyboard_read(address);
266 if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
267 value &= emulate_disk_read(address);
272 static void io_write(uint32_t address, uint16_t value)
274 /* dmacon and sound registers */
275 if (address == 0xdff096 || (address >= 0xdff0a0 && address <= 0xdff0df))
276 emulate_sound_write(address, value, SOUND_SAMPLERATE);
277 if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
278 emulate_disk_write(address, value);
281 /* two tracks with 0x1820 words of length */
282 static uint8_t game_save[2][0x1820 << 1];
283 static int last_track = 0;
285 /* game reads track with saved game */
286 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
288 if (length > sizeof(game_save[0])) {
289 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
293 /* if even track is selected, load game */
296 int gamesave_num = (track - 2) >> 1;
300 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
304 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
305 mkdir(filename, 0777);
307 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
308 fp = fopen(filename, "r");
311 print_error("failed to load game from '%s'\n", filename);
314 got = fread(game_save, sizeof(game_save[0]), 2, fp);
322 memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
325 /* game writes track with saved game */
326 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
328 /* skip sync info that is provided by game and only relevant for a real disk track */
332 if (length != sizeof(game_save[0])) {
333 print_error("saving game state failed, because length of data does not match, please fix!\n");
337 /* don't save if last track is the same, because disk is written on both sides with the same data */
338 if (track == last_track) {
339 if (memcmp(memory + data, game_save[track & 1], length)) {
340 print_error("saving game data on other side of the disk is different, please fix!\n");
347 memcpy(game_save[track & 1], memory + data, length);
349 /* if done with saving */
352 int gamesave_num = (track - 2) >> 1;
359 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
360 mkdir(filename, 0777);
362 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
363 fp = fopen(filename, "w");
366 print_error("failed to save game to '%s'\n", filename);
369 print_info("Game state saved to '%s'\n", filename);
370 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
377 static int shift = 0, ctrl = 0;
379 static void keyboard_sdl(int down, SDL_Keycode sym)
388 config_video_filter ^= 1;
389 print_info("video filter: %s\n", (config_video_filter) ? "on" : "off");
394 config_audio_filter ^= 1;
395 print_info("audio filter: %s\n", (config_audio_filter) ? "on" : "off");
400 config_amiga_speed ^= 1;
401 print_info("amiga speed: %s\n", (config_amiga_speed) ? "original" : "full");
412 set_key("LSH", down);
416 set_key("RSH", down);
422 set_joystick(-1, -1, -1, -1, -1);
426 set_joystick(down, -1, -1, -1, -1);
431 set_joystick(-1, -1, -1, -1, -1);
435 set_joystick(-1, down, -1, -1, -1);
440 set_joystick(-1, -1, -1, -1, -1);
444 set_joystick(-1, -1, down, -1, -1);
449 set_joystick(-1, -1, -1, -1, -1);
453 set_joystick(-1, -1, -1, down, -1);
456 set_joystick(-1, -1, -1, -1, down);
459 case SDLK_a: set_key("A", down); break;
460 case SDLK_b: set_key("B", down); break;
461 case SDLK_c: set_key("C", down); break;
462 case SDLK_d: set_key("D", down); break;
463 case SDLK_e: set_key("E", down); break;
464 case SDLK_f: set_key("F", down); break;
465 case SDLK_g: set_key("G", down); break;
466 case SDLK_h: set_key("H", down); break;
467 case SDLK_i: set_key("I", down); break;
468 case SDLK_j: set_key("J", down); break;
469 case SDLK_k: set_key("K", down); break;
470 case SDLK_l: set_key("L", down); break;
471 case SDLK_m: set_key("M", down); break;
472 case SDLK_n: set_key("N", down); break;
473 case SDLK_o: set_key("O", down); break;
474 case SDLK_p: set_key("P", down); break;
475 case SDLK_q: set_key("Q", down); break;
476 case SDLK_r: set_key("R", down); break;
477 case SDLK_s: set_key("S", down); break;
478 case SDLK_t: set_key("T", down); break;
479 case SDLK_u: set_key("U", down); break;
480 case SDLK_v: set_key("V", down); break;
481 case SDLK_w: set_key("W", down); break;
482 case SDLK_x: set_key("X", down); break;
483 case SDLK_y: set_key("Y", down); break;
484 case SDLK_z: set_key("Z", down); break;
486 case SDLK_0: set_key("0", down); break;
487 case SDLK_1: set_key("1", down); break;
488 case SDLK_2: set_key("2", down); break;
489 case SDLK_3: set_key("3", down); break;
490 case SDLK_4: set_key("4", down); break;
491 case SDLK_5: set_key("5", down); break;
492 case SDLK_6: set_key("6", down); break;
493 case SDLK_7: set_key("7", down); break;
494 case SDLK_8: set_key("8", down); break;
495 case SDLK_9: set_key("9", down); break;
497 case SDLK_KP_0: set_key("NP0", down); break;
498 case SDLK_KP_1: set_key("NP1", down); break;
499 case SDLK_KP_2: set_key("NP2", down); break;
500 case SDLK_KP_3: set_key("NP3", down); break;
501 case SDLK_KP_4: set_key("NP4", down); break;
502 case SDLK_KP_5: set_key("NP5", down); break;
503 case SDLK_KP_6: set_key("NP6", down); break;
504 case SDLK_KP_7: set_key("NP7", down); break;
505 case SDLK_KP_8: set_key("NP8", down); break;
506 case SDLK_KP_9: set_key("NP9", down); break;
507 case SDLK_KP_DIVIDE: set_key("NPDIV", down); break;
508 case SDLK_KP_MULTIPLY: set_key("NPMUL", down); break;
509 case SDLK_KP_MINUS: set_key("NPSUB", down); break;
510 case SDLK_KP_PLUS: set_key("NPADD", down); break;
511 case SDLK_KP_PERIOD: set_key("NPDEL", down); break;
512 // NPLPAREN and NPRPAREN are not emulated
514 case SDLK_F1: set_key("F1", down); break;
515 case SDLK_F2: set_key("F2", down); break;
516 case SDLK_F3: set_key("F3", down); break;
517 case SDLK_F4: set_key("F4", down); break;
518 case SDLK_F5: set_key("F5", down); break;
519 case SDLK_F6: set_key("F6", down); break;
520 case SDLK_F7: set_key("F7", down); break;
521 case SDLK_F8: set_key("F8", down); break;
522 case SDLK_F9: set_key("F9", down); break;
523 case SDLK_F10: set_key("F10", down); break;
525 case SDLK_SPACE: set_key("SPC", down); break;
526 case SDLK_BACKSPACE: set_key("BS", down); break;
527 case SDLK_TAB: set_key("TAB", down); break;
528 case SDLK_KP_ENTER: set_key("ENT", down); break;
529 case SDLK_RETURN: set_key("RET", down); break;
530 case SDLK_ESCAPE: set_key("ESC", down); break;
531 case SDLK_DELETE: set_key("DEL", down); break;
532 case SDLK_INSERT: set_key("HELP", down); break;
537 void audio_sdl(float *data, int length)
541 /* read sound from sound buffer
542 * buffer pointer read and write is atomic, so no locking required!
544 fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
546 #ifdef DEBUG_SOUND_BUFFERING
547 fprintf(stderr, "sound buffer underrun\n");
549 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
550 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
552 for (s = 0; s < length; s++) {
553 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
554 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
556 #ifdef DEBUG_SOUND_BUFFERING
557 printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
559 sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
562 int main(int argc, char *argv[])
567 home_dir = getenv("HOME");
571 rc = parse_args(argc, argv);
576 image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_size) ? 4 : 1), 3);
578 print_error("Failed to allocate image buffer\n");
582 if ((SOUND_SAMPLERATE % IRQ_RATE)) {
583 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
586 if ((1000 % IRQ_RATE)) {
587 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
591 /* calculate SDL chunk size for audio
592 * it must be a power of two, but not more than the chunk size for each IRQ!
594 for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
596 sdl_sound_chunk >>= 1;
597 // printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
599 /* allocate sound buffers */
600 sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
601 sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
603 print_error("Failed to allocate image buffer\n");
607 /* allocate memory */
608 memory = calloc(MEMORY_SIZE, 1);
610 print_error("Failed to allocate cpu's memory\n");
613 chipreg = calloc(IOSIZE, 1);
615 print_error("Failed to allocate chip register\n");
620 execute_init(MEMORY_SIZE, memory, chipreg, io_read, io_write);
622 /* init disk emulation */
623 disk_init(disk_read, disk_write);
628 /* patch some stuff */
631 /* init SDL and OpenGL */
632 rc = init_sdl(argv[0], SCREEN_WIDTH, SCREEN_HEIGHT, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl);
635 rc = init_opengl((double_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
638 resize_opengl(SCREEN_WIDTH, SCREEN_HEIGHT);
640 /* init audio filter */
641 sound_init_filter(SOUND_SAMPLERATE);
646 print_info("**********************************\n");
647 print_info("* Welcome to Mercenary Reloaded! *\n");
648 print_info("**********************************\n\n");
649 print_info("Press CTRL + cursor keys to select inventory or pickup/drop item.\n");
650 print_info("Press CTRL + f to toggle full screen.\n");
651 print_info("Press CTRL + s to toggle rendering speed.\n");
652 print_info("Press CTRL + v to toggle video filter.\n");
653 print_info("Press CTRL + a to toggle audio filter.\n");
654 print_info("Press CTRL + c to exit game.\n\n");
655 print_info("Use '--help' as command line option for configuration settings.\n\n");