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 "../libframerate/framerate.h"
31 #include "../libvideo/video.h"
32 #include "../libsound/sound.h"
33 #include "../libjoystick/joystick.h"
34 #include "../libkeyboard/keyboard.h"
35 #include "../libdisk/disk.h"
36 #include "mercenary.h"
40 #define FOV_NOVAGEN 64.0
41 #define FOV_JOLLY 80.0
44 static int config_ctrl_c = 0;
45 static int config_amiga_speed = 1;
46 #warning fixme: make use of 10 for intro, then be as fast as given
47 static double config_fps = 16.0;
48 static const char *config_gamesave_dir = ".mercenary";
49 static int config_video_filter = 1;
50 static int config_audio_filter = 1;
51 static int config_render = 0;
52 static int config_skip_intro = 0;
53 static int config_multisampling = 16;
54 static double config_fov = FOV_NOVAGEN;
55 static double config_benson_size = 1.0;
56 static int config_debug_transparent = 0;
57 static int config_debug_opengl = 0;
58 /* render improvements */
59 static int config_improve_extend_roads = 1; /* set to 1 to extend roads */
61 #define CPU_SPEED 7093790.0;
63 #define SOUND_SAMPLERATE 48000
65 * - must be used for sound rendering chunk
68 /* numbe of buffer chunks to dejitter:
69 * - SDL render interval
70 * - sound rendering interval
71 * - sound card interval
72 * 4 should be minimum, if video rate is >=50 Hz
74 #define SOUND_CHUNKS 4
76 /* test sound to check if buffer does not overflow / underrun */
77 //#define DEBUG_SOUND_BUFFERING
79 #define IOSIZE 0x1000 /* bytes in io space */
80 #define MEMORY_SIZE 0x80000
81 static uint8_t *memory = NULL;
82 static uint8_t *stop_event = NULL;
83 static uint8_t *image = NULL;
84 #define SCREEN_WIDTH 320
85 #define SCREEN_HEIGHT 200
86 #define IMAGE_WIDTH 320
87 #define IMAGE_HEIGHT 200
88 #define BENSON_AT_LINE 136
89 #define IMAGE_DIWSTART 0x2c
90 static uint16_t *chipreg = NULL;
91 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
92 static int sound_buffer_size; /* buffer sample size */
93 static int sound_buffer_writep; /* write pointer at buffer */
94 static int sound_buffer_readp; /* read pointer at buffer */
95 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
96 static double benson_size; /* render size of benson */
97 static int render_legacy = 0; /* render original amiga screen, if set */
98 static int render_improved = 0; /* render improved image, if set */
99 static int debug_opengl = 0; /* render both, amiga screen and improved image, if set */
101 static const char *home_dir;
105 int parse_args(int argc, char *argv[])
110 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
111 print_info("Usage: %s\n", argv[0]);
112 print_info(" -s --render-speed original | fast\n");
113 print_info(" Set speed of rendering to original Amiga or fast speed.\n");
114 print_info(" --fps <fps>\n");
115 print_info(" Set frames per second for fast rate (default = %.1f).\n", config_fps);
116 print_info(" -v --video-filter on | off\n");
117 print_info(" Set video filter.\n");
118 print_info(" -a --audio-filter on | off\n");
119 print_info(" Set audio filter.\n");
120 print_info(" -r --render original | opengl\n");
121 print_info(" Set speed of rendering to original Amiga or OpenGL.\n");
122 print_info(" -b --benson normal | half\n");
123 print_info(" Size of 'Benson' (control panel).\n");
124 print_info(" -m --multisampling <samples>\n");
125 print_info(" Use multisampling (default = %d) to render the scene.\n", config_multisampling);
126 print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
127 print_info(" Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
128 print_info(" -i --skip-intro\n");
129 print_info(" Skip intro sequence approaching to Eris space port.\n");
130 print_info("Debug options:\n");
131 print_info(" -o --debug-opengl\n");
132 print_info(" Use split screen to display both Amiga and OpenGL rendering.\n");
133 print_info(" --debug-transparent\n");
134 print_info(" Draw all things half transparent.\n");
135 print_info(" --ctrl-c\n");
136 print_info(" Use CTRL+C to exit game (used for development)\n");
139 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
143 print_info("Missing parameter, use '--help'!\n");
146 if (!strcmp(argv[i], "original"))
147 config_amiga_speed = 1;
149 if (!strcmp(argv[i], "fast"))
150 config_amiga_speed = 0;
153 print_info("Illegal parameter, use '--help'!\n");
157 if (!strcmp(argv[i], "--fps")) {
160 goto missing_parameter;
161 config_fps = atof(argv[i]);
162 if (config_fov <= 0.0)
163 goto illegal_parameter;
165 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
168 goto missing_parameter;
169 if (!strcmp(argv[i], "on"))
170 config_video_filter = 1;
172 if (!strcmp(argv[i], "off"))
173 config_video_filter = 0;
175 goto illegal_parameter;
177 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
180 goto missing_parameter;
181 if (!strcmp(argv[i], "on"))
182 config_audio_filter = 1;
184 if (!strcmp(argv[i], "off"))
185 config_audio_filter = 0;
187 goto illegal_parameter;
189 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
192 goto missing_parameter;
193 if (!strcmp(argv[i], "original"))
196 if (!strcmp(argv[i], "opengl"))
199 goto illegal_parameter;
201 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
204 goto missing_parameter;
205 if (!strcmp(argv[i], "normal"))
206 config_benson_size = 1.0;
208 if (!strcmp(argv[i], "half")) {
209 config_benson_size = 0.5;
210 if (config_fov == FOV_NOVAGEN)
211 config_fov = FOV_JOLLY;
213 goto illegal_parameter;
215 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
218 goto missing_parameter;
219 config_multisampling = atoi(argv[i]);
221 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
224 goto missing_parameter;
225 config_fov = atof(argv[i]);
226 if (config_fov < 1.0 || config_fov > 179.0)
227 goto illegal_parameter;
229 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
230 config_skip_intro = 1;
232 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
233 config_debug_opengl = 1;
235 if (!strcmp(argv[i], "--debug-transparent")) {
236 config_debug_transparent = 1;
238 if (!strcmp(argv[i], "--ctrl-c")) {
241 print_info("Illegal option '%s', use '--help'!\n", argv[i]);
250 static void special_event(int event)
253 render_capture_event(event);
256 static void main_loop(void)
258 double frame_step, frame_time = 0.0, frame_render = 1;
259 int had_first_irq = 0;
260 static uint32_t current_time, last_time = 0, diff;
263 int cycle_count, event = STOP_AT_END;
264 double render_delay = 0.0;
265 uint32_t palette_address;
266 uint16_t palette[16];
268 last_time = SDL_GetTicks();
270 /* render result on window */
272 #warning oder ganz anders: bevor landung machen wir amiga-rate als interpolation
273 /* if we are in interstellar fligt, we use 50 Hz */
274 /* if we are approaching to Eris Space Port, we use 10 Hz */
275 /* else we use whatever frame rate the user wants */
276 if (render_capture_is_interstellar())
277 frame_step = vbl_duration * 50.0;
279 frame_step = vbl_duration * config_fps;
280 if (frame_step > 1.0)
282 /* handle SDL events */
290 /* initialize rendering */
291 debug_opengl = config_debug_opengl;
292 benson_size = config_benson_size;
293 render_legacy = (!config_render) || debug_opengl;
294 render_improved = config_render || debug_opengl;
295 if (!render_improved) {
296 /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
297 render_capture_reset();
299 if (render_improved) {
300 opengl_viewport_improved(debug_opengl, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
303 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
304 /* amgia speed: don't render if we still delay */
305 /* non amiga speed: render if we need a new frame */
306 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
307 if ((frame_render && !config_amiga_speed)
308 || (config_amiga_speed && render_delay <= 0.0)
309 || event == STOP_AT_WAIT_INPUT) {
311 /* start capturing for improved graphics */
313 render_capture_start(config_fov, config_improve_extend_roads, config_debug_transparent);
315 /* execute until the rendered image is ready (wait for VBL) */
318 cycle_count += execute_cpu(0, &event);
319 /* handle special events */
320 special_event(event);
321 } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
322 /* stop capturing for improved graphics */
324 render_capture_stop();
326 palette_address = mercenary_palette_view();
327 for (i = 0; i < 16; i++)
328 palette[i] = m68k_read_memory_16(palette_address + i*2);
329 /* for amiga speed: set delay by the number of cycles */
330 if (config_amiga_speed)
331 render_delay += (double)cycle_count / CPU_SPEED;
333 /* render improved graphics, interpolate, if required */
335 render_all_items((config_amiga_speed) ? 1.0 : frame_time);
336 /* advance frame time */
337 printf("frame rate: %.6f, frame-step=%.5f frame-time=%.5f\n", 1.0 / vbl_duration, frame_step,frame_time);
338 frame_time += frame_step;
339 if (frame_time >= 1.0) {
344 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
346 /* render game view without benson
347 * because benson is not updated before VBL IRQ, we don't want old image from double buffer
350 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
352 /* render benson on improved rendering, if enabled */
354 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);
355 /* setup viewport for legacy image and render image, if enabled */
357 opengl_viewport_legacy(debug_opengl);
358 opengl_blit_legacy(image, config_video_filter);
360 /* wait for VBL and show */
362 /* measure frame rate */
365 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
366 current_time = SDL_GetTicks();
367 diff = current_time - last_time;
368 /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
369 if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
370 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
371 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
373 while (diff > 1000 / IRQ_RATE) {
374 execute_cpu(3, NULL);
375 execute_cpu(4, NULL);
377 /* transfer benson without game view
378 * because we only got benson refreshed during VBL IRQ
380 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
381 /* render sound to sound buffer
382 * buffer pointer read and write is atomic, so no locking required!
384 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
385 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
386 #ifdef DEBUG_SOUND_BUFFERING
387 fprintf(stderr, "sound buffer overflow\n");
391 length = SOUND_SAMPLERATE / IRQ_RATE;
392 #ifdef DEBUG_SOUND_BUFFERING
393 printf("can write %d, write %d\n", space, length);
396 for (s = 0; s < length; s++) {
397 sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
398 sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
399 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
400 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
401 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
405 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
407 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
408 diff -= 1000 / IRQ_RATE;
409 last_time += 1000 / IRQ_RATE;
411 /* count down render delay */
413 render_delay -= 1.0 / (double)IRQ_RATE;
414 if (render_delay < 0.0)
421 static uint16_t io_read(uint32_t address)
423 uint16_t value = 0xffff;
425 /* joystick and fire button */
426 if (address == 0xbfe000 || address == 0xdff00c)
427 value &= emulate_joystick_read(address);
429 if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
430 value &= emulate_keyboard_read(address);
432 if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
433 value &= emulate_disk_read(address);
438 static void io_write(uint32_t address, uint16_t value)
440 /* dmacon and sound registers */
441 if (address == 0xdff096 || (address >= 0xdff0a0 && address <= 0xdff0df))
442 emulate_sound_write(address, value, SOUND_SAMPLERATE);
443 if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
444 emulate_disk_write(address, value);
447 /* two tracks with 0x1820 words of length */
448 static uint8_t game_save[2][0x1820 << 1];
449 static int last_track = 0;
451 /* game reads track with saved game */
452 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
454 if (length > sizeof(game_save[0])) {
455 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
459 /* if even track is selected, load game */
462 int gamesave_num = (track - 2) >> 1;
466 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
470 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
471 mkdir(filename, 0777);
473 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
474 fp = fopen(filename, "r");
477 print_error("failed to load game from '%s'\n", filename);
480 got = fread(game_save, sizeof(game_save[0]), 2, fp);
488 memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
491 /* game writes track with saved game */
492 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
494 /* skip sync info that is provided by game and only relevant for a real disk track */
498 if (length != sizeof(game_save[0])) {
499 print_error("saving game state failed, because length of data does not match, please fix!\n");
503 /* don't save if last track is the same, because disk is written on both sides with the same data */
504 if (track == last_track) {
505 if (memcmp(memory + data, game_save[track & 1], length)) {
506 print_error("saving game data on other side of the disk is different, please fix!\n");
513 memcpy(game_save[track & 1], memory + data, length);
515 /* if done with saving */
518 int gamesave_num = (track - 2) >> 1;
525 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
526 mkdir(filename, 0777);
528 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
529 fp = fopen(filename, "w");
532 print_error("failed to save game to '%s'\n", filename);
535 print_info("Game state saved to '%s'\n", filename);
536 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
543 static int shift = 0, ctrl = 0;
545 static void keyboard_sdl(int down, SDL_Keycode sym)
557 config_video_filter ^= 1;
558 print_info("video filter: %s\n", (config_video_filter) ? "on" : "off");
561 config_audio_filter ^= 1;
562 print_info("audio filter: %s\n", (config_audio_filter) ? "on" : "off");
565 config_amiga_speed ^= 1;
566 print_info("amiga speed: %s\n", (config_amiga_speed) ? "original" : "full");
570 print_info("render: %s\n", (config_render) ? "opengl" : "original");
573 if (config_benson_size == 0.5) {
574 config_benson_size = 1.0;
575 config_fov = FOV_NOVAGEN;
577 config_benson_size = 0.5;
578 config_fov = FOV_JOLLY;
580 print_info("benson: %s\n", (config_benson_size == 0.5) ? "half" : "normal");
587 if (config_fov / 1.2 >= FOV_MIN)
589 print_info("FOV: %.2f\n", config_fov);
592 if (config_fov * 1.2 <= FOV_MAX)
594 print_info("FOV: %.2f\n", config_fov);
597 /* do not pass keys to game while holding CTRL */
603 set_key("LSH", down);
607 set_key("RSH", down);
613 set_joystick(-1, -1, -1, -1, -1);
617 set_joystick(down, -1, -1, -1, -1);
622 set_joystick(-1, -1, -1, -1, -1);
626 set_joystick(-1, down, -1, -1, -1);
631 set_joystick(-1, -1, -1, -1, -1);
635 set_joystick(-1, -1, down, -1, -1);
640 set_joystick(-1, -1, -1, -1, -1);
644 set_joystick(-1, -1, -1, down, -1);
647 set_joystick(-1, -1, -1, -1, down);
650 case SDLK_a: set_key("A", down); break;
651 case SDLK_b: set_key("B", down); break;
652 case SDLK_c: set_key("C", down); break;
653 case SDLK_d: set_key("D", down); break;
654 case SDLK_e: set_key("E", down); break;
655 case SDLK_f: set_key("F", down); break;
656 case SDLK_g: set_key("G", down); break;
657 case SDLK_h: set_key("H", down); break;
658 case SDLK_i: set_key("I", down); break;
659 case SDLK_j: set_key("J", down); break;
660 case SDLK_k: set_key("K", down); break;
661 case SDLK_l: set_key("L", down); break;
662 case SDLK_m: set_key("M", down); break;
663 case SDLK_n: set_key("N", down); break;
664 case SDLK_o: set_key("O", down); break;
665 case SDLK_p: set_key("P", down); break;
666 case SDLK_q: set_key("Q", down); break;
667 case SDLK_r: set_key("R", down); break;
668 case SDLK_s: set_key("S", down); break;
669 case SDLK_t: set_key("T", down); break;
670 case SDLK_u: set_key("U", down); break;
671 case SDLK_v: set_key("V", down); break;
672 case SDLK_w: set_key("W", down); break;
673 case SDLK_x: set_key("X", down); break;
674 case SDLK_y: set_key("Y", down); break;
675 case SDLK_z: set_key("Z", down); break;
677 case SDLK_0: set_key("0", down); break;
678 case SDLK_1: set_key("1", down); break;
679 case SDLK_2: set_key("2", down); break;
680 case SDLK_3: set_key("3", down); break;
681 case SDLK_4: set_key("4", down); break;
682 case SDLK_5: set_key("5", down); break;
683 case SDLK_6: set_key("6", down); break;
684 case SDLK_7: set_key("7", down); break;
685 case SDLK_8: set_key("8", down); break;
686 case SDLK_9: set_key("9", down); break;
688 case SDLK_KP_0: set_key("NP0", down); break;
689 case SDLK_KP_1: set_key("NP1", down); break;
690 case SDLK_KP_2: set_key("NP2", down); break;
691 case SDLK_KP_3: set_key("NP3", down); break;
692 case SDLK_KP_4: set_key("NP4", down); break;
693 case SDLK_KP_5: set_key("NP5", down); break;
694 case SDLK_KP_6: set_key("NP6", down); break;
695 case SDLK_KP_7: set_key("NP7", down); break;
696 case SDLK_KP_8: set_key("NP8", down); break;
697 case SDLK_KP_9: set_key("NP9", down); break;
698 case SDLK_KP_DIVIDE: set_key("NPDIV", down); break;
699 case SDLK_KP_MULTIPLY: set_key("NPMUL", down); break;
700 case SDLK_KP_MINUS: set_key("NPSUB", down); break;
701 case SDLK_KP_PLUS: set_key("NPADD", down); break;
702 case SDLK_KP_PERIOD: set_key("NPDEL", down); break;
703 // NPLPAREN and NPRPAREN are not emulated
705 case SDLK_F1: set_key("F1", down); break;
706 case SDLK_F2: set_key("F2", down); break;
707 case SDLK_F3: set_key("F3", down); break;
708 case SDLK_F4: set_key("F4", down); break;
709 case SDLK_F5: set_key("F5", down); break;
710 case SDLK_F6: set_key("F6", down); break;
711 case SDLK_F7: set_key("F7", down); break;
712 case SDLK_F8: set_key("F8", down); break;
713 case SDLK_F9: set_key("F9", down); break;
714 case SDLK_F10: set_key("F10", down); break;
716 case SDLK_SPACE: set_key("SPC", down); break;
717 case SDLK_BACKSPACE: set_key("BS", down); break;
718 case SDLK_TAB: set_key("TAB", down); break;
719 case SDLK_KP_ENTER: set_key("ENT", down); break;
720 case SDLK_RETURN: set_key("RET", down); break;
721 case SDLK_ESCAPE: set_key("ESC", down); break;
722 case SDLK_DELETE: set_key("DEL", down); break;
723 case SDLK_INSERT: set_key("HELP", down); break;
728 void audio_sdl(float *data, int length)
732 /* read sound from sound buffer
733 * buffer pointer read and write is atomic, so no locking required!
735 fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
737 #ifdef DEBUG_SOUND_BUFFERING
738 fprintf(stderr, "sound buffer underrun\n");
740 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
741 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
743 for (s = 0; s < length; s++) {
744 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
745 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
747 #ifdef DEBUG_SOUND_BUFFERING
748 printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
750 sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
753 int main(int argc, char *argv[])
758 home_dir = getenv("HOME");
762 rc = parse_args(argc, argv);
767 image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
769 print_error("Failed to allocate image buffer\n");
773 if ((SOUND_SAMPLERATE % IRQ_RATE)) {
774 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
777 if ((1000 % IRQ_RATE)) {
778 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
782 /* calculate SDL chunk size for audio
783 * it must be a power of two, but not more than the chunk size for each IRQ!
785 for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
787 sdl_sound_chunk >>= 1;
788 // printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
790 /* allocate sound buffers */
791 sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
792 sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
794 print_error("Failed to allocate image buffer\n");
798 /* allocate memory */
799 memory = calloc(MEMORY_SIZE, 1);
801 print_error("Failed to allocate cpu's memory\n");
804 stop_event = calloc(MEMORY_SIZE, 1);
806 print_error("Failed to allocate cpu's stop_event memory\n");
809 chipreg = calloc(IOSIZE, 1);
811 print_error("Failed to allocate chip register\n");
816 execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
818 /* init disk emulation */
819 disk_init(disk_read, disk_write);
824 /* patch some stuff */
827 /* init SDL and OpenGL */
828 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);
831 rc = init_opengl((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
834 resize_opengl((config_debug_opengl) ? SCREEN_WIDTH * 2 : SCREEN_WIDTH * 3, (config_debug_opengl) ? SCREEN_HEIGHT * 4 : SCREEN_HEIGHT * 3);
836 /* init audio filter */
837 sound_init_filter(SOUND_SAMPLERATE);
842 if (config_skip_intro) {
845 print_info("*** Skipping intro, fast forwarding... ***\n\n");
847 execute_cpu(0, &event);
848 } while (event != STOP_AT_CLEAR_SCREEN1);
850 execute_cpu(0, &event);
851 } while (event != STOP_AT_WAIT_VBL);
854 print_info("**********************************\n");
855 print_info("* Welcome to Mercenary Reloaded! *\n");
856 print_info("**********************************\n\n");
857 print_info("Press CTRL + cursor keys to select inventory or pickup/drop item.\n");
858 print_info("Press CTRL + f to toggle full screen.\n");
859 print_info("Press CTRL + s to toggle rendering speed.\n");
860 print_info("Press CTRL + v to toggle video filter.\n");
861 print_info("Press CTRL + a to toggle audio filter.\n");
862 print_info("Press CTRL + r to toggle rendering with opengl or orignal code.\n");
863 print_info("Press CTRL + Keypad Plus to decrement FOV.\n");
864 print_info("Press CTRL + Keypad Minus to increment FOV.\n");
865 print_info("Press CTRL + c to exit game.\n\n");
866 print_info("Use '--help' as command line option for configuration settings.\n\n");