X-Git-Url: http://git.eversberg.eu/gitweb.cgi?p=mercenary-reloaded.git;a=blobdiff_plain;f=src%2Fmercenary%2Fmain.c;h=45d87e4bca4637f5df95041260555dcbe51d4981;hp=4057676b11edfbfeefa50aa12bd896dbfcd4fc78;hb=3c70467233fef462f9bc9a132019800386978cc8;hpb=1b9fcb60552f1ac701dbf815d46cc32066f979d7

diff --git a/src/mercenary/main.c b/src/mercenary/main.c
index 4057676..45d87e4 100644
--- a/src/mercenary/main.c
+++ b/src/mercenary/main.c
@@ -20,24 +20,71 @@
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
-#include <endian.h>
+#include <string.h>
+#include <math.h>
 #include <sys/stat.h>
 #include <sys/types.h>
+#include "../../include/keycodes.h"
 #include "../libsdl/sdl.h"
-#include "../libsdl/opengl.h"
+#ifdef HAVE_OVR
+#include "../libovr/ovr.h"
+#include "../libovr/keyboard.h"
+#endif
+#include "../libopengl/opengl.h"
+#include "../libsdl/print.h"
 #include "../libcpu/m68k.h"
 #include "../libcpu/execute.h"
+#include "../libframerate/framerate.h"
 #include "../libvideo/video.h"
 #include "../libsound/sound.h"
 #include "../libjoystick/joystick.h"
 #include "../libkeyboard/keyboard.h"
 #include "../libdisk/disk.h"
+#include "../libtext/text.h"
 #include "mercenary.h"
+#include "render.h"
+
+#define FOV_MIN		10.0
+#define FOV_NOVAGEN	64.0
+#define FOV_JOLLY	80.0
+#define FOV_MAX		170.0
 
-static int config_amiga_speed = 1;
+#define STICK_WALK_THRESHOLD 0.3 /* move the stick until the player moves */
+#define STICK_ROTATE_THRESHOLD 0.3 /* move the stick until the player rotates */
+#define STICK_THRUST_THRESHOLD 0.1 /* move the stick until the craft moves */
+
+static int config_ctrl_c = 0;
+static int config_amiga_speed = 0; /* fast speed */
+static double config_fps = 10.0;
+#if !defined(_WIN32)
 static const char *config_gamesave_dir = ".mercenary";
-static int config_video_filter = 0;
+#endif
+static int config_video_filter = 1;
 static int config_audio_filter = 1;
+static int config_render = 1; /* opengl render */
+static int config_skip_intro = 0;
+static int config_multisampling = 8;
+static int config_joystick = -1, config_joystick_x = -1, config_joystick_y = -1, config_joystick_fire = -1;
+#ifdef HAVE_OVR
+static double config_benson_size = 0.7;
+static double config_fov = FOV_JOLLY;
+#else
+static double config_benson_size = 1.0;
+static double config_fov = FOV_NOVAGEN;
+#endif
+static double config_monitor_distance = 41.5; /* inch */
+#ifdef HAVE_OVR
+static double config_keyboard_distance = 38.5; /* inch */
+static double config_keyboard_height = -26.0; /* inch */
+#endif
+static int config_debug_transparent = 0;
+static int config_debug_opengl = 0;
+/* render improvements */
+static int config_improve_extend_roads = 1;	/* set to 1 to extend roads */
+static int config_improve_smooth_planets = 1;	/* set to 1 to rotate planets smoothly */
+static int config_improve_stars_rotation = 1;	/* set to 1 to improve star rendering */
+static int config_improve_fix_sky_rotation = 0;	/* set to 1 to fix sky rotation */
+static int config_improve_round_planets = 0;	/* set to 1 to make planets exactly round */
 
 #define CPU_SPEED	7093790.0;
 
@@ -60,409 +107,893 @@ static int config_audio_filter = 1;
 #define IOSIZE		0x1000 /* bytes in io space */
 #define	MEMORY_SIZE	0x80000
 static uint8_t *memory = NULL;
+static uint8_t *stop_event = NULL;
 static uint8_t *image = NULL;
+static uint8_t *help_osd[3] = { NULL, NULL, NULL };
+static uint8_t *info_osd = NULL;
+static int help_view = 1;
+static int help_views = 0;
+static int32_t osd_timer = 0, border_timer = 0;
 #define SCREEN_WIDTH	(320*3)
 #define SCREEN_HEIGHT	(200*3)
 #define IMAGE_WIDTH	320
 #define IMAGE_HEIGHT	200
 #define BENSON_AT_LINE	136
 #define IMAGE_DIWSTART	0x2c
+#define HELP_ALPHA	0xd0
+#define OSD_WIDTH	320
+#define OSD_HEIGHT	16
 static uint16_t *chipreg = NULL;
-static float *sound_buffer = NULL; /* sound buffer memory */
+static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 static int sound_buffer_size; /* buffer sample size */
 static int sound_buffer_writep; /* write pointer at buffer */
 static int sound_buffer_readp; /* read pointer at buffer */
+static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
+static double benson_size; /* render size of benson */
+static int render_legacy = 0; /* render original amiga screen, if set */
+static int render_improved = 0; /* render improved image, if set */
+static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
+static int intro_skipped = 0; /* indicated if we already have landed */
+static int window_width, window_height;
+static int mission_disk = 0;
 
 static const char *home_dir;
 
 static int quit = 0;
 
-static void main_loop(void)
+int parse_args(int argc, char *argv[])
 {
-	int had_first_irq = 0;
-	static uint32_t current_time, last_time = 0, diff;
-	int i, rc;
-	int space, length;
-	int cycle_count;
-	double render_delay = 0.0;
-	uint32_t palette_address;
-	uint16_t palette[16];
-
-	last_time = SDL_GetTicks();
-
-	/* render result on window */
-	while (!quit) {
-		/* STEP 1: let the CPU render/process the game */
-		/* don't render if we still delay */
-		if (!render_delay) {
-			/* execute until the rendered image is ready */
-			cycle_count = execute_cpu(0, mercenary_stop_at);
-			/* copy palette */
-			palette_address = mercenary_palette();
-			for (i = 0; i < 16; i++)
-				palette[i] = m68k_read_memory_16(palette_address + i*2);
-			/* for amiga speed: set delay by the number of cycles */
-			if (config_amiga_speed)
-				render_delay = (double)cycle_count / CPU_SPEED;
-		}
-
-		/* STEP 2: render image in memory via OpenGL */
-		if (had_first_irq) {
-			/* render game view without benson
-			 * because benson is not updated before VBL IRQ, we don't want old image from double buffer
-			 */
-			emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE);
-		}
-		rc = event_sdl();
-		if (rc)
-			break;
-		render_opengl(image, config_video_filter);
-		swap_sdl();
+	int i = 1;
 
-		/* STEP 3: execute interrupt at rate of 50Hz, render sound */
-		current_time = SDL_GetTicks();
-		diff = current_time - last_time;
-		/* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
-		if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
-			diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
-			last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
-		}
-		while (diff > 1000 / IRQ_RATE) {
-			execute_cpu(3, NULL);
-			execute_cpu(4, NULL);
-			had_first_irq = 1;
-			/* render benson without game view
-			 * because we only got benson refreshed during VBL IRQ
-			 */
-			emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT);
-			/* render sound to sound buffer
-			 * buffer pointer read and write is atomic, so no locking required!
-			 */
-			space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
-			if (space < SOUND_SAMPLERATE / IRQ_RATE) {
-#ifdef DEBUG_SOUND_BUFFERING
-				fprintf(stderr, "sound buffer overflow\n");
-#endif
-				length = space;
-			} else
-				length = SOUND_SAMPLERATE / IRQ_RATE;
-#ifdef DEBUG_SOUND_BUFFERING
-			printf("can write %d, write %d\n", space, length);
-			static int cnt = 0;
-			int s;
-			for (s = 0; s < length; s++) {
-				sound_buffer[(sound_buffer_writep + s) % sound_buffer_size]
-					= sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
-					* sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
-				 	* sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
-				 cnt++;
+	while (argc > i) {
+		if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
+			/*          |                                                                             | */
+			print_info("Usage: %s\n", argv[0]);
+			print_info(" -s --render-speed original | fast\n");
+			print_info("        Set speed of rendering to original Amiga or fast speed.\n");
+			print_info("    --fps <fps>\n");
+			print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
+			print_info(" -v --video-filter on | off\n");
+			print_info("        Set video filter.\n");
+			print_info(" -a --audio-filter on | off\n");
+			print_info("        Set audio filter.\n");
+			print_info(" -r --render original | opengl\n");
+			print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
+			print_info(" -b --benson normal | half\n");
+			print_info("        Size of 'Benson' (control panel).\n");
+			print_info(" -m --multisampling <samples>\n");
+			print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
+			print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
+			print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
+			print_info(" -i --skip-intro\n");
+			print_info("        Skip intro sequence approaching to Eris space port.\n");
+			print_info(" -j --joystick <num> | list\n");
+			print_info("        Select given joystick number or show list. (default = 0, if available)\n");
+			print_info("    --joystick-x <axis num>\n");
+			print_info("    --joystick-y <axis num>\n");
+			print_info("    --joystick-fire <button num>\n");
+			print_info("        Specify explicit axis and button of joystick.\n");
+			print_info("Improvement options:\n");
+			print_info("    --extend-roads 1 | 0\n");
+			print_info("        Roads in the distance end in a single point. This was ok for low\n");
+			print_info("        resolution, but for OpenGL we want equal width all the way.\n");
+			print_info("        This requires OpenGL rendering. (default = %d)\n", config_improve_extend_roads);
+			print_info("    --smooth-planets 1 | 0\n");
+			print_info("        Planet's rotation uses integer value, so they judder in the original\n");
+			print_info("        game rendering. This option requires OpenGL rendering. (default = %d)\n", config_improve_smooth_planets);
+			print_info("    --stars-rotation 1 | 0\n");
+			print_info("        Stars are rendered originally by using a fast routine. Use this option\n");
+			print_info("        to make them render on a sphere. They also rotate with the sky then.\n");
+			print_info("        This requires OpenGL rendering and is default with VR. (default = %d)\n", config_improve_stars_rotation);
+			print_info("    --fix-sky-rotation 1 | 0\n");
+			print_info("        Sky rotates in the wrong direction, if flying over planet. This is\n");
+			print_info("        fixed by rotating all sky object by 180 degrees. The original (wrong)\n");
+			print_info("        rotation is default, because it preserves the game's spirit!\n");
+			print_info("        This option requires OpenGL rendering. (default = %d)\n", config_improve_fix_sky_rotation);
+			print_info("    --round-planets 1 | 0\n");
+			print_info("        The original game renders planets and explosion debris horizontally\n");
+			print_info("        stretched. This compensates the vertical stretch of NTSC vs PAL video.\n");
+			print_info("        The original (stretched) sphere makes the game authentic.\n");
+			print_info("        This option requires OpenGL rendering. (default = %d)\n", config_improve_round_planets);
+			print_info("Debug options:\n");
+			print_info(" -o --debug-opengl\n");
+			print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
+			print_info("    --debug-transparent\n");
+			print_info("        Draw all things half transparent.\n");
+			print_info("    --ctrl-c\n");
+			print_info("        Use CTRL+C to exit game (used for development)\n");
+			return -1;
+		} else
+		if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
+			i++;
+			if (argc == i) {
+missing_parameter:
+				print_info("Missing parameter, use '--help'!\n");
+				return -1;
 			}
-#else
-			render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
-#endif
-			sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
-			diff -= 1000 / IRQ_RATE;
-			last_time += 1000 / IRQ_RATE;
-
-			/* count down render delay */
-			if (render_delay) {
-				render_delay -= 1.0 / (double)IRQ_RATE;
-				if (render_delay < 0.0)
-					render_delay = 0.0;
+			if (!strcmp(argv[i], "original"))
+				config_amiga_speed = 1;
+			else
+			if (!strcmp(argv[i], "fast"))
+				config_amiga_speed = 0;
+			else {
+illegal_parameter:
+				print_info("Illegal parameter, use '--help'!\n");
+				return -1;
 			}
+		} else
+		if (!strcmp(argv[i], "--fps")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			config_fps = atof(argv[i]);
+			if (config_fov <= 0.0)
+				goto illegal_parameter;
+		} else
+		if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			if (!strcmp(argv[i], "on"))
+				config_video_filter = 1;
+			else
+			if (!strcmp(argv[i], "off"))
+				config_video_filter = 0;
+			else
+				goto illegal_parameter;
+		} else
+		if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			if (!strcmp(argv[i], "on"))
+				config_audio_filter = 1;
+			else
+			if (!strcmp(argv[i], "off"))
+				config_audio_filter = 0;
+			else
+				goto illegal_parameter;
+		} else
+		if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			if (!strcmp(argv[i], "original"))
+				config_render = 0;
+			else
+			if (!strcmp(argv[i], "opengl"))
+				config_render = 1;
+			else
+				goto illegal_parameter;
+		} else
+		if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			if (!strcmp(argv[i], "normal"))
+				config_benson_size = 1.0;
+			else
+			if (!strcmp(argv[i], "half")) {
+				config_benson_size = 0.5;
+				if (config_fov == FOV_NOVAGEN)
+					config_fov = FOV_JOLLY;
+			} else
+				goto illegal_parameter;
+		} else
+		if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			config_multisampling = atoi(argv[i]);
+		} else
+		if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			config_fov = atof(argv[i]);
+			if (config_fov < 1.0 || config_fov > 179.0)
+				goto illegal_parameter;
+		} else
+		if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
+			config_skip_intro = 1;
+		} else
+		if (!strcmp(argv[i], "-j") || !strcmp(argv[i], "--joystick")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			if (!strcmp(argv[i], "list")) {
+				sdl_list_joysticks();
+				return 1;
+			}
+			config_joystick = atoi(argv[i]);
+		} else
+		if (!strcmp(argv[i], "--joystick-x")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			config_joystick_x = atoi(argv[i]);
+		} else
+		if (!strcmp(argv[i], "--joystick-y")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			config_joystick_y = atoi(argv[i]);
+		} else
+		if (!strcmp(argv[i], "--joystick-fire")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			config_joystick_fire = atoi(argv[i]);
+		} else
+		if (!strcmp(argv[i], "--extend-roads")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			config_improve_extend_roads = atoi(argv[i]);
+		} else
+		if (!strcmp(argv[i], "--smooth-planets")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			config_improve_smooth_planets = atoi(argv[i]);
+		} else
+		if (!strcmp(argv[i], "--stars-rotation")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			config_improve_stars_rotation = atoi(argv[i]);
+		} else
+		if (!strcmp(argv[i], "--fix-sky-rotation")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			config_improve_fix_sky_rotation = atoi(argv[i]);
+		} else
+		if (!strcmp(argv[i], "--round-planets")) {
+			i++;
+			if (argc == i)
+				goto missing_parameter;
+			config_improve_round_planets = atoi(argv[i]);
+		} else
+		if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
+			config_debug_opengl = 1;
+		} else
+		if (!strcmp(argv[i], "--debug-transparent")) {
+			config_debug_transparent = 1;
+		} else
+		if (!strcmp(argv[i], "--ctrl-c")) {
+			config_ctrl_c = 1;
+		} else {
+			print_info("Illegal option '%s', use '--help'!\n", argv[i]);
+			return -1;
 		}
+		i++;
 	}
+
+	return 0;
 }
 
-int main(int __attribute__((unused)) argc, char *argv[])
+static void osd_info(const char *param, const char *value)
 {
-	int rc;
-	int sdl_sound_chunk;
+	char line[41] = "                                        ";
 
-	home_dir = getenv("HOME");
-	if (!home_dir)
-		home_dir = "";
-
-	/* allocate image */
-	image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT, 3);
-	if (!image) {
-		fprintf(stderr, "Failed to allocate image buffer\n");
-		goto done;
+	if (param[0]) {
+		strncpy(line + 21 - strlen(param), param, strlen(param));
+		line[22] = ':';
 	}
-
-	if ((SOUND_SAMPLERATE % IRQ_RATE)) {
-		fprintf(stderr, "Sample rate must be a multiple of IRQ rate, please fix!\n");
-		goto done;
-	}
-	if ((1000 % IRQ_RATE)) {
-		fprintf(stderr, "1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
-		goto done;
+	if (strlen(value) > 15) {
+		print_error("string too long\n");
+		return;
 	}
+	strncpy(line + 25, value, strlen(value));
+	text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
+	osd_timer = ticks_sdl() + 2500;
+}
 
-	/* calculate SDL chunk size for audio
-	 * it must be a power of two, but not more than the chunk size for each IRQ!
-	 */
-	for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
-		;
-	sdl_sound_chunk >>= 1;
-//	printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
+static void toggle_help(void)
+{
+	if (help_view == 0)
+		help_view = 2;
+	else
+	if (help_view == help_views)
+		help_view = 0;
+	else
+		help_view++;
+}
 
-	/* allocate sound buffers */
-	sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
-	sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
-	if (!sound_buffer) {
-		fprintf(stderr, "Failed to allocate image buffer\n");
-		goto done;
-	}
+static void resize_window(int width, int height)
+{
+	window_width = width;
+	window_height = height;
+	border_timer = ticks_sdl() + 1500;
+	osd_info("", "window resized");
+}
 
-	/* allocate memory */
-	memory = calloc(MEMORY_SIZE, 1);
-	if (!memory) {
-		fprintf(stderr, "Failed to allocate cpu's memory\n");
-		goto done;
+#ifdef HAVE_OVR
+static int __attribute__((unused)) button_a_last = 0, button_b_last = 0, button_x_last = 0, button_y_last = 0, button_menu_last = 0, button_left_trigger_last = 0, button_right_trigger_last = 0, button_left_thumb_last = 0, button_right_thumb_last = 0;
+static double __attribute__((unused)) stick_left_x_last = 0.0, stick_left_y_last = 0.0, stick_right_x_last = 0.0, stick_right_y_last = 0.0;
+static int thrust_last = 0;
+static int joystick_set_x_last = 0, joystick_set_y_last = 0;
+static int keyboard_on = 0;
+static enum keycode vr_key_pressed = 0, vr_key = 0;
+static int we_walk = 0, we_rotate = 0;
+static double degrees45 = 45.0 / 180.0 * M_PI;
+
+static void handle_vr_poses(void)
+{
+	int button_a = 0, button_b = 0, button_x = 0, button_y = 0, button_menu = 0, button_left_trigger = 0, button_right_trigger = 0, button_left_thumb = 0, button_right_thumb = 0;
+	double hand_right_x = 0.0, hand_right_y = 0.0, hand_right_z = 0.0;
+	double hand_right_yaw = 0.0, hand_right_pitch = 0.0, hand_right_roll = 0.0;
+	double head_yaw = 0.0, head_pitch = 0.0, head_roll = 0.0;
+	double stick_left_x = 0.0, stick_left_y = 0.0, stick_right_x = 0.0, stick_right_y = 0.0;
+	int thrust = thrust_last;
+	int joystick_set_x = 0, joystick_set_y = 0;
+	static uint32_t current_time, last_time = 0, diff;
+	static double increment, inc_count = 0.0;
+
+	/* handle input */
+	get_poses_ovr(&button_a, &button_b, &button_x, &button_y, &button_menu, &button_left_trigger, &button_right_trigger, &button_left_thumb, &button_right_thumb, &hand_right_x, &hand_right_y, &hand_right_z, &hand_right_yaw, &hand_right_pitch, &hand_right_roll, &stick_left_x, &stick_left_y, &stick_right_x, &stick_right_y, &head_yaw, &head_pitch, &head_roll);
+	if (button_a && !button_a_last) {
+		/* menu toggle */
+		toggle_help();
 	}
-	chipreg = calloc(IOSIZE, 1);
-	if (!chipreg) {
-		fprintf(stderr, "Failed to allocate chip register\n");
-		goto done;
+	if (button_b && !button_b_last) {
+		/* reset observer */
+		reset_observer_ovr();
+		osd_info("", "reset observer");
 	}
+	if (button_x && !button_x_last) {
+		/* menu toggle */
+		toggle_help();
+	}
+	if (button_y && !button_y_last) {
+		/* reset observer */
+		reset_observer_ovr();
+		osd_info("", "reset observer");
+	}
+	if (!help_view) {
+		if (button_right_trigger && !button_right_trigger_last) {
+			/* trigger pressed */
+			if (keyboard_on) {
+				if (vr_key) {
+					vr_key_pressed = vr_key;
+					set_amiga_key(vr_key_pressed, 1);
+					/* reset vr thrust */
+					thrust = 0;
+				}
+			} else {
+				/* fire button */
+				set_joystick(-1, -1, -1, -1, 1);
+			}
+		}
+		if (!button_right_trigger && button_right_trigger_last) {
+			/* trigger released */
+			set_joystick(-1, -1, -1, -1, 0);
+			if (vr_key_pressed) {
+				set_amiga_key(vr_key_pressed, 0);
+				vr_key_pressed = 0;
+			}
+		}
+		/* joystick */
+		/* reset moving state, so the game is not influenced before we want to */
+		mercenary_vr_move(0, NULL, NULL, 256, 256);
+		joystick_set_x = 0;
+		joystick_set_y = 0;
+		if (!mercenary_get_info_walking()) {
+			/* turn right and left when not walking */
+			if (stick_right_x > STICK_ROTATE_THRESHOLD) {
+				set_joystick(0, 1, -1, -1, -1);
+				joystick_set_x = 1;
+			} else
+			if (stick_right_x < -STICK_ROTATE_THRESHOLD) {
+				set_joystick(1, 0, -1, -1, -1);
+				joystick_set_x = 1;
+			}
+			/* pitch craft */
+			if (stick_right_y > STICK_WALK_THRESHOLD) {
+				set_joystick(-1, -1, 1, 0, -1);
+				joystick_set_y = 1;
+			} else
+			if (stick_right_y < -STICK_WALK_THRESHOLD) {
+				set_joystick(-1, -1, 0, 1, -1);
+				joystick_set_y = 1;
+			}
+			if (joystick_set_x || joystick_set_y) {
+				mercenary_vr_move(0, NULL, NULL,
+					256,
+					(int)(256.0 * fabs(stick_right_y) - STICK_WALK_THRESHOLD / (1.0 - STICK_WALK_THRESHOLD) + 0.5));
+			}
+		} else {
+			double roll, pitch, yaw;
+			double tilt, dir, east, north;
+			int32_t move_east[4], move_north[4];
 
-	/* init cpu code */
-	execute_init(MEMORY_SIZE, memory, chipreg);
-
-	/* load binary */
-	mercenary_load();
+			tilt = sqrt(stick_right_x * stick_right_x + stick_right_y * stick_right_y);
 
-	/* patch some stuff */
-	mercenary_patch();
+			/* check if we rotate, walk or rest */
+			if (we_rotate == 0 && we_walk == 0) {
+				/* we rest */
+				if (fabs(stick_right_y) > fabs(stick_right_x) && tilt > STICK_WALK_THRESHOLD)
+					we_walk = 1;
+				if (fabs(stick_right_x) > fabs(stick_right_y) && tilt > STICK_ROTATE_THRESHOLD)
+					we_rotate = 1;
+			} else if (we_walk) {
+				/* we walk */
+				if (tilt < STICK_WALK_THRESHOLD) {
+					we_walk = 0;
+					/* we need to stop right here and not continue until next rendering */
+					set_joystick(-1, -1, 0, 0, -1); /* stop y */
+					reset_joystick(); /* commit stop */
+				}
+			} else {
+				/* we rotate */
+				if (tilt < STICK_ROTATE_THRESHOLD)
+					we_rotate = 0;
+			}
 
-	/* init SDL and OpenGL */
-	rc = init_sdl(argv[0], SCREEN_WIDTH, SCREEN_HEIGHT, SOUND_SAMPLERATE, sdl_sound_chunk);
-	if (rc < 0)
-		goto done;
-	rc = init_opengl(IMAGE_WIDTH, IMAGE_HEIGHT);
-	if (rc < 0)
-		goto done;
-	resize_opengl(SCREEN_WIDTH, SCREEN_HEIGHT);
+			/* if we walk */
+			if (we_walk) {
+				/* get stick amplitude (dist) and direction (dir) */
+				if (tilt > 1.0)
+					tilt = 1.0;
+				tilt = (tilt - STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
+				dir = atan2(stick_right_x, stick_right_y);
+#if 0
+				/* use hand direction to get actual stick direction */
+				dir = fmod(dir - hand_right_yaw, M_PI * 2.0);
+				if (dir < -M_PI)
+					dir += M_PI * 2.0;
+				if (dir > M_PI)
+					dir -= M_PI * 2.0;
+#endif
+				/* flip direction, if we walk backwards */
+				if (dir > M_PI / 2.0 || dir < -M_PI / 2.0) {
+					/* go backwards */
+					set_joystick(-1, -1, 0, 1, -1);
+					joystick_set_y = 1;
+				} else {
+					/* go forward */
+					set_joystick(-1, -1, 1, 0, -1);
+					joystick_set_y = 1;
+				}
+				mercenary_get_orientation(&roll, &pitch, &yaw);
+				east = sin(yaw - dir + M_PI) * tilt;
+				north = -cos(yaw - dir + M_PI) * tilt;
+				/* calculatate the integer positions of 4 steps */
+				move_east[0] = (int32_t)((east * 0.25) + 0.5);
+				move_north[0] = (int32_t)((north * 0.25) + 0.5);
+				move_east[1] = (int32_t)((east * 0.5) + 0.5);
+				move_north[1] = (int32_t)((north * 0.5) + 0.5);
+				move_east[2] = (int32_t)((east * 0.75) + 0.5);
+				move_north[2] = (int32_t)((north * 0.75) + 0.5);
+				move_east[3] = (int32_t)(east + 0.5);
+				move_north[3] = (int32_t)(north + 0.5);
+				/* calculate the delta between each of the 4 step */
+				move_east[3] -= move_east[2];
+				move_north[3] -= move_north[2];
+				move_east[2] -= move_east[1];
+				move_north[2] -= move_north[1];
+				move_east[1] -= move_east[0];
+				move_north[1] -= move_north[0];
+				/* the game takes 4 steps to move the player */
+				mercenary_vr_move(1, move_east, move_north, 256, 256);
+			}
 
-	/* init audio filter */
-	sound_init_filter(SOUND_SAMPLERATE);
+			/* snap orientation to steps of 45 degrees */
+			if (we_rotate == 1) {
+				mercenary_get_orientation(&roll, &pitch, &yaw);
+				yaw = round(yaw / degrees45) * degrees45;
+				/* if we rotate: change orientation */
+				if (stick_right_x > 0)
+					yaw -= degrees45;
+				else
+					yaw += degrees45;
+				/* rotate only once per stick movement */
+				we_rotate = 2;
+				mercenary_set_orientation(yaw);
+			}
+		}
+		if (joystick_set_x_last && !joystick_set_x)
+			set_joystick(0, 0, -1, -1, -1);
+		if (joystick_set_y_last && !joystick_set_y)
+			set_joystick(-1, -1, 0, 0, -1);
+		/* thrust */
+		/* button to toggle between stop and escape */
+		if (button_left_thumb && !button_left_thumb_last) {
+			/* 'escape' pressed */
+			if (thrust_last != -99)
+				thrust = -99;
+			else
+				thrust = 0;
+		}
+		/* button to stop */
+		if (button_left_trigger && !button_left_trigger_last) {
+			/* 'stop' pressed */
+			thrust = 0;
+		}
+		/* get stick to increment or decrement thrust */
+		if (stick_left_y > STICK_THRUST_THRESHOLD)
+			increment = (stick_left_y - STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
+		else
+		if (stick_left_y < -STICK_THRUST_THRESHOLD)
+			increment = (stick_left_y + STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
+		else
+			increment = 0;
+		current_time = ticks_sdl();
+		if (increment) {
+			diff = current_time - last_time;
+			inc_count += increment * diff;
+			/* if we are in 'escape' mode, we stop thrust first */
+			if (thrust == -99)
+				thrust = 0;
+			if (inc_count > 150.0 && thrust >= -10 && thrust < 10) {
+				thrust++;
+				inc_count = 0.0;
+			}
+			if (inc_count < -150.0 && thrust <= 10 && thrust > -10) {
+				thrust--;
+				inc_count = 0.0;
+			}
+		} else {
+			inc_count = 0;
+		}
+		last_time = current_time;
+		/* send thrust change as keycodes */
+		if (thrust_last != thrust) {
+			/* if we were in escape mode, we stop us first and then apply the new code */
+			if (thrust_last == -99) {
+				set_amiga_key(KEYCODE_SPACE, 1);
+				set_amiga_key(KEYCODE_SPACE, 0);
+			}
 
-	/* start cpu */
-	reset_cpu();
+			if (thrust >= 10) {
+				set_amiga_key(KEYCODE_0, 1);
+				set_amiga_key(KEYCODE_0, 0);
+			} else
+			if (thrust <= -10 && thrust > -99) {
+				set_amiga_key(KEYCODE_F10, 1);
+				set_amiga_key(KEYCODE_F10, 0);
+			} else
+			if (thrust <= -99) {
+				set_amiga_key(KEYCODE_ESCAPE, 1);
+				set_amiga_key(KEYCODE_ESCAPE, 0);
+			} else
+			if (thrust > 0) {
+				set_amiga_key(KEYCODE_1 + thrust - 1, 1);
+				set_amiga_key(KEYCODE_1 + thrust - 1, 0);
+			} else
+			if (thrust < 0) {
+				set_amiga_key(KEYCODE_F1 - thrust - 1, 1);
+				set_amiga_key(KEYCODE_F1 - thrust - 1, 0);
+			} else {
+				set_amiga_key(KEYCODE_SPACE, 1);
+				set_amiga_key(KEYCODE_SPACE, 0);
+			}
+		}
+	}
+	button_a_last = button_a;
+	button_b_last = button_b;
+	button_x_last = button_x;
+	button_y_last = button_y;
+	button_menu_last = button_menu;
+	button_left_trigger_last = button_left_trigger;
+	button_right_trigger_last = button_right_trigger;
+	button_left_thumb_last = button_left_thumb;
+	button_right_thumb_last = button_right_thumb;
+	stick_left_x_last = stick_left_x;
+	stick_left_y_last = stick_left_y;
+	stick_right_x_last = stick_right_x;
+	stick_right_y_last = stick_right_y;
+	thrust_last = thrust;
+	joystick_set_x_last = joystick_set_x;
+	joystick_set_y_last = joystick_set_y;
 
-	printf("Welcome to Mercenary Reloaded!\n\n");
-	printf("Press CTRL + cursor keys to select inventory or pickup/drop item.\n");
-	printf("Press CTRL + f to toggle full screen.\n");
-	printf("Press CTRL + s to toggle rendering speed.\n");
-	printf("Press CTRL + v to toggle video filter.\n");
-	printf("Press CTRL + a to toggle audio filter.\n");
-	printf("Press CTRL + c to exit game.\n");
-	printf("\n");
+	/* we must handle keyboard after toggeling keyboard_on,
+	 * so that keyboard_on will not change until keyboard is rendered */
+	vr_key = 0;
+	keyboard_on = handle_vr_keyboard(hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
+}
+#endif
 
-	/* run game */
-	main_loop();
+static void skip_intro(void)
+{
+	int event;
+	double render_delay = 0.0;
+	double cycle_count;
 
-done:
-	exit_opengl();
-	exit_sdl();
+	if (intro_skipped)
+		return;
 
-	if (chipreg)
-		free(chipreg);
-	if (memory)
-		free(memory);
-	if (sound_buffer)
-		free(sound_buffer);
-	if (image)
-		free(image);
+	print_info("*** Skipping intro, fast forwarding... ***\n\n");
+	do {
+		/* render, if not delayed */
+		if (render_delay <= 0.0) {
+			cycle_count = 0;
+			do {
+				cycle_count += execute_cpu(0, &event);
+			} while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
+			render_delay += (double)cycle_count / CPU_SPEED;
+		}
+		/* VBL */
+		execute_cpu(3, NULL);
+		/* count down render delay */
+		if (render_delay) {
+			render_delay -= 1.0 / (double)IRQ_RATE;
+			if (render_delay < 0.0)
+				render_delay = 0.0;
+		}
+	} while (event != STOP_AT_CLEAR_SCREEN1);
 
-	return 0;
+	intro_skipped = 1;
 }
 
-void audio_sdl(float *data, int length)
+static void special_event(int event)
 {
-	int fill, s;
-
-	/* read sound from sound buffer
-	 * buffer pointer read and write is atomic, so no locking required!
-	 */
-	fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
-	if (fill < length) {
-#ifdef DEBUG_SOUND_BUFFERING
-		fprintf(stderr, "sound buffer underrun\n");
-#endif
-		/* correct read pointer as if the buffer would have 'length' of samples stored inside */
-		sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
+#ifdef HAVE_OVR
+	/* handle VR events */
+	if (event == STOP_AT_PATCH_VR) {
+		mercenary_patch_vr();
+		return;
 	}
-	for (s = 0; s < length; s++)
-		*data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size];
-#ifdef DEBUG_SOUND_BUFFERING
-	printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp]);
 #endif
-	sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
+	/* handle events to improve rendering */
+	if (render_improved)
+		render_capture_event(event);
 }
 
-static int shift = 0, ctrl = 0;
-
-void keyboard_sdl(int down, SDL_Keycode sym)
+static void main_loop(void)
 {
-	switch (sym) {
-	case SDLK_LCTRL:
-	case SDLK_RCTRL:
-		ctrl = down;
-		break;
-	case SDLK_v:
-		if (down && ctrl) {
-			config_video_filter ^= 1;
-			printf("video filter: %s\n", (config_video_filter) ? "on" : "off");
-		}
-		break;
-	case SDLK_a:
-		if (down && ctrl) {
-			config_audio_filter ^= 1;
-			printf("audio filter: %s\n", (config_audio_filter) ? "on" : "off");
-		}
-		break;
-	case SDLK_s:
-		if (down && ctrl) {
-			config_amiga_speed ^= 1;
-			printf("amiga speed: %s\n", (config_amiga_speed) ? "original" : "full");
-		}
-		break;
-	case SDLK_c:
-		if (down)
-			quit = 1;
-		break;
-	}
+	double frame_step, frame_time = 0.0, frame_render = 1;
+	int had_first_irq = 0;
+	static uint32_t current_time, last_time = 0, diff;
+	int i, rc;
+	int space, length;
+	int cycle_count, event = STOP_AT_END;
+	double render_delay = 0.0;
+	uint32_t palette_address;
+	uint16_t palette[16];
+	int all_white = 0;
+#ifdef HAVE_OVR
+	int eye;
+	int vr = 1;
+#else
+	int vr = 0;
+#endif
 
-	switch (sym) {
-	case SDLK_LSHIFT:
-		set_key("LSH", down);
-		shift = down;
-		break;
-	case SDLK_RSHIFT:
-		set_key("RSH", down);
-		shift = down;
-		break;
-	case SDLK_LEFT:
-		if (shift && down) {
-			set_key("LF", down);
-			set_joystick(-1, -1, -1, -1, -1);
+	last_time = ticks_sdl();
+
+	/* render result on window */
+	while (!quit) {
+#ifdef HAVE_OVR
+		/* quit by OVR server */
+		if (should_quit_ovr())
 			break;
-		}
-		set_key("LF", 0);
-		set_joystick(down, -1, -1, -1, -1);
-		break;
-	case SDLK_RIGHT:
-		if (shift && down) {
-			set_key("RT", down);
-			set_joystick(-1, -1, -1, -1, -1);
+		/* get vr poses */
+		handle_vr_poses();
+#endif
+		/* if we are in interstellar fligt, we use 50 Hz */
+		/* if we are approaching to Eris Space Port, we use 10 Hz */
+		/* else we use whatever frame rate the user wants */
+		if (render_capture_is_interstellar())
+			frame_step = vbl_duration * 50.0;
+		else if (!intro_skipped)
+			frame_step = vbl_duration * 10.0;
+		else
+			frame_step = vbl_duration * config_fps;
+		if (frame_step > 1.0)
+			frame_step = 1.0;
+		/* handle SDL events */
+		rc = event_sdl();
+		if (rc)
 			break;
+
+		/* initialize rendering */
+		debug_opengl = config_debug_opengl;
+		benson_size = config_benson_size;
+		render_legacy = (!config_render) || debug_opengl;
+		render_improved = config_render || debug_opengl;
+		if (!render_improved) {
+			/* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
+			render_capture_reset();
 		}
-		set_key("RT", 0);
-		set_joystick(-1, down, -1, -1, -1);
-		break;
-	case SDLK_UP:
-		if (shift && down) {
-			set_key("UP", down);
-			set_joystick(-1, -1, -1, -1, -1);
-			break;
+		/* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
+		/* amgia speed: don't render if we still delay */
+		/* non amiga speed: render if we need a new frame */
+		/* NOTE: at input event we must render after every VBL, so we do this in every loop */
+		/* in case of help view: stop cpu after first IRQ, regardless of other options */
+		/* NOTE: We need initial IRQ, so we have out copper list initialized */
+		if (((frame_render && !config_amiga_speed)
+		  || (config_amiga_speed && render_delay <= 0.0)
+		  || event == STOP_AT_WAIT_INPUT)
+		&& !(had_first_irq && help_view)) {
+			frame_render = 0;
+			/* start capturing for improved graphics */
+			if (render_improved)
+				render_capture_start(config_fov, config_improve_extend_roads, config_improve_smooth_planets, config_improve_stars_rotation, config_improve_fix_sky_rotation, config_improve_round_planets, config_debug_transparent);
+
+			/* execute until the rendered image is ready (wait for VBL) */
+			cycle_count = 0;
+			do {
+				cycle_count += execute_cpu(0, &event);
+				/* handle special events */
+				special_event(event);
+				if (event == STOP_AT_CLEAR_SCREEN1)
+					intro_skipped = 1;
+			} while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
+			/* stop capturing for improved graphics */
+			if (render_improved)
+				render_capture_stop();
+			/* copy palette */
+			palette_address = mercenary_palette_view();
+			for (i = 0; i < 16; i++)
+				palette[i] = m68k_read_memory_16(palette_address + i*2);
+			/* for amiga speed: set delay by the number of cycles */
+			if (config_amiga_speed)
+				render_delay += (double)cycle_count / CPU_SPEED;
+			/* reset joystick after rendering */
+			reset_joystick();
 		}
-		set_key("UP", 0);
-		set_joystick(-1, -1, down, -1, -1);
-		break;
-	case SDLK_DOWN:
-		if (shift && down) {
-			set_key("DN", down);
-			set_joystick(-1, -1, -1, -1, -1);
-			break;
+
+		/* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
+#ifdef HAVE_OVR
+		begin_render_ovr();
+
+		for (eye = 0; eye < 2; eye++) {
+			double camera_x, camera_y, camera_z;
+			/* begin of rendering eye, viewport and frustum is set here */
+			begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
+#else
+		{
+#endif
+			/* clear screen */
+			opengl_clear(vr);
+			/* render benson + osd ontop of improved opengl rendering, if enabled */
+			if (render_improved) {
+#ifndef HAVE_OVR
+				/* viewport and frustum is set here */
+				opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
+#endif
+				/* render improved graphics, interpolate, if required,
+				 * if no item list is available, for legacy rendering
+				 */
+				if (all_white)
+					rc = render_all_white(vr);
+				else
+					rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, vr);
+				if (rc)
+					goto goto_legacy;
+				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, vr);
+				if (help_view)
+					opengl_blit_osd(0, help_osd[help_view - 1], config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, (vr) ? FOV_NOVAGEN : config_fov, config_monitor_distance, (vr) ? 1.0 : benson_size, 1.0, 1.0, 0.0, 0.0);
+				if (osd_timer) {
+					opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, (vr) ? FOV_NOVAGEN : config_fov, config_monitor_distance, (vr) ? 1.0 : benson_size, 0.5, 0.04, 0.5, -0.95);
+					if (osd_timer - (int32_t)ticks_sdl() < 0)
+						osd_timer = 0;
+				}
+#ifndef HAVE_OVR
+				/* draw border around legacy render area */
+				if (border_timer) {
+					opengl_render_color(1.0, 0.0, 0.0, 1.0);
+					opengl_render_line(160, -68, 256, 160, 68, 256, 0.0);
+					opengl_render_line(-160, -68, 256, -160, 68, 256, 0.0);
+					opengl_render_line(-160, 68, 256, 160, 68, 256, 0.0);
+					opengl_render_line(-160, -68, 256, 160, -68, 256, 0.0);
+					if (border_timer - (int32_t)ticks_sdl() < 0)
+						border_timer = 0;
+				}
+#endif
+			}
+			/* setup viewport for legacy image and render image, if enabled */
+			/* also render legacy, if render_improved failed due to not (yet) available items */
+			if (render_legacy) {
+				goto_legacy:
+				/* render game view without benson
+				 * because benson is not updated before VBL IRQ, we don't want old image from double buffer
+				 */
+				if (had_first_irq)
+					emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
+#ifndef HAVE_OVR
+				/* viewport and frustum is set here */
+				opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, 1.0);
+#endif
+				opengl_blit_image(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, 0, FOV_NOVAGEN, config_monitor_distance, 1.0, 0);
+				if (help_view)
+					opengl_blit_osd(0, help_osd[help_view - 1], config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, config_monitor_distance, 1.0, 1.0, 1.0, 0.0, 0.0);
+				if (osd_timer) {
+					opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, config_monitor_distance, 1.0, 0.5, 0.04, 0.5, -0.95);
+					if (osd_timer - (int32_t)ticks_sdl() < 0)
+						osd_timer = 0;
+				}
+			}
+#ifdef HAVE_OVR
+			/* render keyboard */
+			if (keyboard_on)
+				render_vr_keyboard(camera_x, camera_y);
+
+			/* end of rendering eye */
+			end_render_ovr_eye(eye);
 		}
-		set_key("DN", 0);
-		set_joystick(-1, -1, -1, down, -1);
-		break;
-	case SDLK_END:
-		set_joystick(-1, -1, -1, -1, down);
-		break;
+		/* at this point we are ready with our image, so we display */
+		end_render_ovr();
+		render_mirror_ovr(window_width, window_height);
+#else
+		}
+#endif
+		swap_sdl();
 
-	case SDLK_a: set_key("A", down); break;
-	case SDLK_b: set_key("B", down); break;
-	case SDLK_c: set_key("C", down); break;
-	case SDLK_d: set_key("D", down); break;
-	case SDLK_e: set_key("E", down); break;
-	case SDLK_f: set_key("F", down); break;
-	case SDLK_g: set_key("G", down); break;
-	case SDLK_h: set_key("H", down); break;
-	case SDLK_i: set_key("I", down); break;
-	case SDLK_j: set_key("J", down); break;
-	case SDLK_k: set_key("K", down); break;
-	case SDLK_l: set_key("L", down); break;
-	case SDLK_m: set_key("M", down); break;
-	case SDLK_n: set_key("N", down); break;
-	case SDLK_o: set_key("O", down); break;
-	case SDLK_p: set_key("P", down); break;
-	case SDLK_q: set_key("Q", down); break;
-	case SDLK_r: set_key("R", down); break;
-	case SDLK_s: set_key("S", down); break;
-	case SDLK_t: set_key("T", down); break;
-	case SDLK_u: set_key("U", down); break;
-	case SDLK_v: set_key("V", down); break;
-	case SDLK_w: set_key("W", down); break;
-	case SDLK_x: set_key("X", down); break;
-	case SDLK_y: set_key("Y", down); break;
-	case SDLK_z: set_key("Z", down); break;
-
-	case SDLK_0: set_key("0", down); break;
-	case SDLK_1: set_key("1", down); break;
-	case SDLK_2: set_key("2", down); break;
-	case SDLK_3: set_key("3", down); break;
-	case SDLK_4: set_key("4", down); break;
-	case SDLK_5: set_key("5", down); break;
-	case SDLK_6: set_key("6", down); break;
-	case SDLK_7: set_key("7", down); break;
-	case SDLK_8: set_key("8", down); break;
-	case SDLK_9: set_key("9", down); break;
-
-	case SDLK_KP_0: set_key("NP0", down); break;
-	case SDLK_KP_1: set_key("NP1", down); break;
-	case SDLK_KP_2: set_key("NP2", down); break;
-	case SDLK_KP_3: set_key("NP3", down); break;
-	case SDLK_KP_4: set_key("NP4", down); break;
-	case SDLK_KP_5: set_key("NP5", down); break;
-	case SDLK_KP_6: set_key("NP6", down); break;
-	case SDLK_KP_7: set_key("NP7", down); break;
-	case SDLK_KP_8: set_key("NP8", down); break;
-	case SDLK_KP_9: set_key("NP9", down); break;
-	case SDLK_KP_DIVIDE: set_key("NPDIV", down); break;
-	case SDLK_KP_MULTIPLY: set_key("NPMUL", down); break;
-	case SDLK_KP_MINUS: set_key("NPSUB", down); break;
-	case SDLK_KP_PLUS: set_key("NPADD", down); break;
-	case SDLK_KP_PERIOD: set_key("NPDEL", down); break;
-	// NPLPAREN and NPRPAREN are not emulated
-
-	case SDLK_F1: set_key("F1", down); break;
-	case SDLK_F2: set_key("F2", down); break;
-	case SDLK_F3: set_key("F3", down); break;
-	case SDLK_F4: set_key("F4", down); break;
-	case SDLK_F5: set_key("F5", down); break;
-	case SDLK_F6: set_key("F6", down); break;
-	case SDLK_F7: set_key("F7", down); break;
-	case SDLK_F8: set_key("F8", down); break;
-	case SDLK_F9: set_key("F9", down); break;
-	case SDLK_F10: set_key("F10", down); break;
-
-	case SDLK_SPACE: set_key("SPC", down); break;
-	case SDLK_BACKSPACE: set_key("BS", down); break;
-	case SDLK_TAB: set_key("TAB", down); break;
-	case SDLK_KP_ENTER: set_key("ENT", down); break;
-	case SDLK_RETURN: set_key("RET", down); break;
-	case SDLK_ESCAPE: set_key("ESC", down); break;
-	case SDLK_DELETE: set_key("DEL", down); break;
-	case SDLK_INSERT: set_key("HELP", down); break;
+		/* advance frame time, if we are not in help view  */
+		if (!(had_first_irq && help_view)) {
+			frame_time += frame_step;
+			if (frame_time >= 1.0) {
+				frame_time -= 1.0;
+				frame_render = 1;
+			}
+		}
+
+		/* measure frame rate */
+		framerate_measure();
 
+		/* STEP 3: execute interrupt at rate of 50Hz, render sound */
+		/* only do this, if we are not in help view */
+		/* NOTE: We need initial IRQ, so we have out copper list initialized */
+		if (!(had_first_irq && help_view)) {
+			current_time = ticks_sdl();
+			diff = current_time - last_time;
+			/* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
+			if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
+				diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
+				last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
+			}
+			while (diff > 1000 / IRQ_RATE) {
+				/* trigger and execute IRQ 3 = VBL */
+				execute_cpu(3, NULL);
+				had_first_irq = 1;
+				/* transfer benson without game view
+				 * because we only got benson refreshed during VBL IRQ
+				 */
+				all_white = emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
+				/* render sound to sound buffer
+				 * buffer pointer read and write is atomic, so no locking required!
+				 */
+				space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
+				if (space < SOUND_SAMPLERATE / IRQ_RATE) {
+#ifdef DEBUG_SOUND_BUFFERING
+					fprintf(stderr, "sound buffer overflow\n");
+#endif
+					length = space;
+				} else
+					length = SOUND_SAMPLERATE / IRQ_RATE;
+#ifdef DEBUG_SOUND_BUFFERING
+				printf("can write %d, write %d\n", space, length);
+				static int cnt = 0;
+				int s;
+				for (s = 0; s < length; s++) {
+					sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
+					sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
+						= sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
+						* sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
+						* sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
+					 cnt++;
+				}
+#else
+				render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
+#endif
+				sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
+				diff -= 1000 / IRQ_RATE;
+				last_time += 1000 / IRQ_RATE;
+
+				/* count down render delay */
+				if (render_delay) {
+					render_delay -= 1.0 / (double)IRQ_RATE;
+					if (render_delay < 0.0)
+						render_delay = 0.0;
+				}
+			}
+		}
 	}
 }
 
-uint16_t emulate_io_read(uint32_t address)
+static uint16_t io_read(uint32_t address)
 {
 	uint16_t value = 0xffff;
 
@@ -479,10 +1010,10 @@ uint16_t emulate_io_read(uint32_t address)
 	return value;
 }
 
-void emulate_io_write(uint32_t address, uint16_t value)
+static void io_write(uint32_t address, uint16_t value)
 {
 	/* dmacon and sound registers */
-	if (address == 0xdff096 || (address >= 0xdff0a0 && address <= 0xdff0df))
+	if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 		emulate_sound_write(address, value, SOUND_SAMPLERATE);
 	if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 		emulate_disk_write(address, value);
@@ -493,10 +1024,10 @@ static uint8_t game_save[2][0x1820 << 1];
 static int last_track = 0;
 
 /* game reads track with saved game */
-void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
+static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 {
 	if (length > sizeof(game_save[0])) {
-		fprintf(stderr, "loading game state failed, because length exceeds game save data size, please fix!\n");
+		print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 		return;
 	}
 
@@ -504,21 +1035,44 @@ void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint1
 	if (!(track & 1)) {
 		char filename[256];
 		int gamesave_num = (track - 2) >> 1;
-		int got;
-		FILE *fp;
 
 		memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
-		sprintf(filename, "%s/%s/%d.gamesave", home_dir, config_gamesave_dir, gamesave_num);
-		fp = fopen(filename, "r");
-		if (!fp) {
+
+		if (mission_disk == 0) {
+			int got;
+			FILE *fp;
+
+#if defined(_WIN32)
+			filename[0] = '\0';
+#else
+			sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
+			mkdir(filename, 0777);
+#endif
+			sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
+			fp = fopen(filename, "r");
+			if (!fp) {
 fail:
-			fprintf(stderr, "failed to load game from '%s'\n", filename);
-			goto copy;
+				print_info("failed to load game from '%s'\n", filename);
+				osd_info("load game", "FAILED!");
+				goto copy;
+			}
+			got = fread(game_save, sizeof(game_save[0]), 2, fp);
+			fclose(fp);
+			if (got != 2)
+				goto fail;
+			sprintf(filename, "#%d", gamesave_num);
+			osd_info("loaded game", filename);
+		} else {
+			const uint8_t *mission_data = get_mission_disk(mission_disk, gamesave_num);
+			sprintf(filename, "disk %d #%d", mission_disk, gamesave_num);
+			if (!mission_data) {
+				print_info("failed to load mission %s\n", filename);
+				osd_info("load mission", "FAILED!");
+				goto copy;
+			}
+			memcpy(game_save, mission_data, 0x1820 << 2);
+			osd_info("loaded mission", filename);
 		}
-		got = fread(game_save, sizeof(game_save[0]), 2, fp);
-		fclose(fp);
-		if (got != 2)
-			goto fail;
 	}
 
 copy:
@@ -527,21 +1081,27 @@ copy:
 }
 
 /* game writes track with saved game */
-void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
+static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 {
+	/* cannot save on mission disk */
+	if (mission_disk) {
+		osd_info("", "not applicable");
+		return;
+	}
+
 	/* skip sync info that is provided by game and only relevant for a real disk track */
 	data += 0x200;
 	length -= 0x200;
 
 	if (length != sizeof(game_save[0])) {
-		fprintf(stderr, "saving game state failed, because length of data does not match, please fix!\n");
+		print_error("saving game state failed, because length of data does not match, please fix!\n");
 		return;
 	}
 
 	/* don't save if last track is the same, because disk is written on both sides with the same data */
 	if (track == last_track) {
 		if (memcmp(memory + data, game_save[track & 1], length)) {
-			fprintf(stderr, "saving game data on other side of the disk is different, please fix!\n");
+			print_error("saving game data on other side of the disk is different, please fix!\n");
 		}
 		return;
 	}
@@ -557,19 +1117,532 @@ void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint
 		int wrote;
 		FILE *fp;
 
-		sprintf(filename, "%s/%s", home_dir, config_gamesave_dir);
+#if defined(_WIN32)
+		filename[0] = '\0';
+#else
+		sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 		mkdir(filename, 0777);
-		sprintf(filename + strlen(filename), "/%d.gamesave", gamesave_num);
+#endif
+		sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 		fp = fopen(filename, "w");
 		if (!fp) {
 fail:
-			fprintf(stderr, "failed to save game to '%s'\n", filename);
+			print_error("failed to save game to '%s'\n", filename);
+			osd_info("save game", "FAILED!");
 			return;
 		}
-		printf("Game state saved to '%s'\n", filename);
+		print_info("Game state saved to '%s'\n", filename);
+		sprintf(filename, "#%d", gamesave_num);
+		osd_info("saved game", filename);
 		wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 		fclose(fp);
 		if (wrote != 2)
 			goto fail;
 	}
 }
+
+static int shift = 0, ctrl = 0, alt = 0;
+
+static void keyboard_sdl(int down, enum keycode keycode)
+{
+	switch (keycode) {
+	case KEYCODE_LCTRL:
+	case KEYCODE_RCTRL:
+		ctrl = down;
+		break;
+	default: break;
+	}
+
+	if (ctrl && down) {
+		switch (keycode) {
+		case KEYCODE_h:
+			toggle_help();
+			break;
+		case KEYCODE_v:
+			config_video_filter ^= 1;
+			osd_info("video filter", (config_video_filter) ? "on" : "off");
+			break;
+		case KEYCODE_a:
+			config_audio_filter ^= 1;
+			osd_info("audio filter", (config_audio_filter) ? "on" : "off");
+			break;
+		case KEYCODE_s:
+			config_amiga_speed ^= 1;
+			osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
+			break;
+		case KEYCODE_r:
+			config_render ^= 1;
+			osd_info("render mode", (config_render) ? "OpenGL" : "original");
+			break;
+		case KEYCODE_b:
+			if (!config_render && !config_debug_opengl) {
+				osd_info("", "not applicable");
+				break;
+			}
+			if (config_benson_size == 0.5) {
+				config_benson_size = 1.0;
+				config_fov = FOV_NOVAGEN;
+			} else {
+				config_benson_size = 0.5;
+				config_fov = FOV_JOLLY;
+			}
+			osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
+			border_timer = ticks_sdl() + 1500;
+			break;
+		case KEYCODE_i:
+			if (!intro_skipped)
+				skip_intro();
+			else
+				osd_info("", "not applicable");
+			break;
+		case KEYCODE_1:
+			if (get_mission_disk(1, 1)) { /* just to check support */
+				mission_disk = 1;
+				osd_info("mission disk", "insert 1");
+			} else
+				osd_info("", "not applicable");
+			break;
+		case KEYCODE_2:
+			if (get_mission_disk(2, 1)) { /* just to check support */
+				mission_disk = 2;
+				osd_info("mission disk", "insert 2");
+			} else
+				osd_info("", "not applicable");
+			break;
+		case KEYCODE_0:
+			if (get_mission_disk(1, 1)) { /* just to check support */
+				mission_disk = 0;
+				osd_info("mission disk", "removed");
+			} else
+				osd_info("", "not applicable");
+			break;
+		case KEYCODE_c:
+			if (config_ctrl_c)
+				quit = 1;
+			break;
+		case KEYCODE_o:
+#ifdef HAVE_OVR
+			reset_observer_ovr();
+			osd_info("", "reset observer");
+#else
+			osd_info("", "not applicable");
+#endif
+			break;
+		case KEYCODE_KP_PLUS:
+#ifdef HAVE_OVR
+			osd_info("", "not applicable");
+#else
+			if (config_fov / 1.2 >= FOV_MIN)
+				config_fov /= 1.2;
+			disp_fov:
+			{
+				char text[16];
+				if (config_fov < 63.5 || config_fov > 64.5)
+					sprintf(text, "%.2f", config_fov);
+				else
+					sprintf(text, "%.2f (default)", config_fov);
+				osd_info("FOV", text);
+				border_timer = ticks_sdl() + 1500;
+			}
+#endif
+			break;
+		case KEYCODE_KP_MINUS:
+#ifdef HAVE_OVR
+			osd_info("", "not applicable");
+#else
+			if (config_fov * 1.2 <= FOV_MAX)
+				config_fov *= 1.2;
+			goto disp_fov;
+#endif
+			break;
+		default: break;
+		}
+		/* do not pass keys to game while holding CTRL */
+		return;
+	}
+
+	if (help_view == 1 && down) {
+		help_view = 2;
+		return;
+	}
+
+	if (keycode == KEYCODE_PAUSE && down) {
+		toggle_help();
+		return;
+	}
+
+	/* in help view we must not forward keypresses */
+	if (help_view)
+		return;
+
+	switch (keycode) {
+	case KEYCODE_LSHIFT:
+		set_amiga_key(keycode, down);
+		shift = down;
+		break;
+	case KEYCODE_RSHIFT:
+		set_amiga_key(keycode, down);
+		shift = down;
+		break;
+	case KEYCODE_LALT:
+		set_amiga_key(keycode, down);
+		alt = down;
+		break;
+	case KEYCODE_RALT:
+		set_amiga_key(keycode, down);
+		alt = down;
+		break;
+	case KEYCODE_LEFT:
+		if (shift && down) {
+			set_amiga_key(keycode, down);
+			set_joystick(-1, -1, -1, -1, -1);
+			break;
+		}
+		set_amiga_key(keycode, 0);
+		set_joystick(down, -1, -1, -1, -1);
+		break;
+	case KEYCODE_RIGHT:
+		if (shift && down) {
+			set_amiga_key(keycode, down);
+			set_joystick(-1, -1, -1, -1, -1);
+			break;
+		}
+		set_amiga_key(keycode, 0);
+		set_joystick(-1, down, -1, -1, -1);
+		break;
+	case KEYCODE_UP:
+		if (shift && down) {
+			set_amiga_key(keycode, down);
+			set_joystick(-1, -1, -1, -1, -1);
+			break;
+		}
+		set_amiga_key(keycode, 0);
+		if (!alt || down)
+			set_joystick(-1, -1, down, 0, -1);
+		break;
+	case KEYCODE_DOWN:
+		if (shift && down) {
+			set_amiga_key(keycode, down);
+			set_joystick(-1, -1, -1, -1, -1);
+			break;
+		}
+		set_amiga_key(keycode, 0);
+		if (!alt || down)
+			set_joystick(-1, -1, 0, down, -1);
+		break;
+	case KEYCODE_END:
+		set_joystick(-1, -1, -1, -1, down);
+		break;
+	case KEYCODE_INSERT:
+		set_amiga_key(KEYCODE_HELP, down);
+		break;
+	default:
+		/* reset vr thrust */
+#ifdef HAVE_OVR
+		thrust_last = 0;
+#endif
+		set_amiga_key(keycode, down);
+	}
+}
+
+static double joystick_last_x = 0, joystick_last_y = 0;
+static int joystick_last_fire = 0;
+
+static void joystick_sdl(double x, double y, int fire)
+{
+	int left = -1, right = -1, up = -1, down = -1;
+
+	if (x <= -0.5 && joystick_last_x > -0.5)
+		left = 1;
+	if (x > -0.5 && joystick_last_x <= -0.5)
+		left = 0;
+	if (x >= 0.5 && joystick_last_x < 0.5)
+		right = 1;
+	if (x < 0.5 && joystick_last_x >= 0.5)
+		right = 0;
+	if (y <= -0.5 && joystick_last_y > -0.5)
+		up = 1;
+	if (y > -0.5 && joystick_last_y <= -0.5)
+		up = 0;
+	if (y >= 0.5 && joystick_last_y < 0.5)
+		down = 1;
+	if (y < 0.5 && joystick_last_y >= 0.5)
+		down = 0;
+	set_joystick(left, right, up, down, fire);
+	joystick_last_x = x;
+	joystick_last_y = y;
+	joystick_last_fire = fire;
+}
+
+void audio_sdl(float *data, int length)
+{
+	int fill, s;
+
+	/* read sound from sound buffer
+	 * buffer pointer read and write is atomic, so no locking required!
+	 */
+	fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
+	if (fill < length) {
+#ifdef DEBUG_SOUND_BUFFERING
+		fprintf(stderr, "sound buffer underrun\n");
+#endif
+		/* correct read pointer as if the buffer would have 'length' of samples stored inside */
+		sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
+	}
+	for (s = 0; s < length; s++) {
+		*data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
+		*data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
+	}
+#ifdef DEBUG_SOUND_BUFFERING
+	printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
+#endif
+	sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
+}
+
+/* used for geier counter */
+void sound_irq(void)
+{
+	/* trigger and execute IRQ 4 = sound */
+	execute_cpu(4, NULL);
+}
+
+extern uint8_t mercenary_splash_palette[][3];
+extern char mercenary_splash_pixels[];
+
+int main(int argc, char *argv[])
+{
+	int rc;
+	int sdl_sound_chunk;
+
+	home_dir = getenv("HOME");
+	if (!home_dir)
+		home_dir = "";
+
+	rc = parse_args(argc, argv);
+	if (rc)
+		return 0;
+
+	/* allocate image */
+	image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
+	if (!image) {
+		print_error("Failed to allocate image buffer\n");
+		goto done;
+	}
+
+	if ((SOUND_SAMPLERATE % IRQ_RATE)) {
+		print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
+		goto done;
+	}
+	if ((1000 % IRQ_RATE)) {
+		print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
+		goto done;
+	}
+
+	/* calculate SDL chunk size for audio
+	 * it must be a power of two, but not more than the chunk size for each IRQ!
+	 */
+	for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
+		;
+	sdl_sound_chunk >>= 1;
+//	printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
+
+	/* allocate sound buffers */
+	sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
+	sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
+	if (!sound_buffer) {
+		print_error("Failed to allocate image buffer\n");
+		goto done;
+	}
+
+	/* allocate memory */
+	memory = calloc(MEMORY_SIZE, 1);
+	if (!memory) {
+		print_error("Failed to allocate cpu's memory\n");
+		goto done;
+	}
+	stop_event = calloc(MEMORY_SIZE, 1);
+	if (!stop_event) {
+		print_error("Failed to allocate cpu's stop_event memory\n");
+		goto done;
+	}
+	chipreg = calloc(IOSIZE, 1);
+	if (!chipreg) {
+		print_error("Failed to allocate chip register\n");
+		goto done;
+	}
+
+	/* init cpu code */
+	execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
+
+	/* init disk emulation */
+	disk_init(disk_read, disk_write);
+
+	/* load binary */
+	mercenary_load();
+
+	/* patch some stuff */
+	mercenary_patch();
+
+	/* init SDL and OpenGL */
+#ifdef HAVE_OVR
+	int vbl_sync = 0;
+	int vr = 1;
+	int multisampling = 0;
+	window_width = SCREEN_WIDTH;
+	window_height = SCREEN_HEIGHT;
+#else
+	int vbl_sync = 1;
+	int vr = 0;
+	int multisampling = config_multisampling;
+	window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
+	window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
+#endif
+	rc = init_sdl(mercenary_name, window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, config_joystick, config_joystick_x, config_joystick_y, config_joystick_fire, joystick_sdl, audio_sdl, resize_window, multisampling, vbl_sync, vr);
+	if (rc < 0)
+		goto done;
+#ifdef HAVE_OVR
+	rc = init_ovr(config_multisampling);
+	if (rc < 0)
+		goto done;
+	rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
+	if (rc < 0)
+		goto done;
+#endif
+	rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
+	if (rc < 0)
+		goto done;
+
+	/* init osd */
+	rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
+	if (rc < 0)
+		goto done;
+	rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
+	if (rc < 0)
+		goto done;
+	help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, 0x00);
+	if (!help_osd[0])
+		goto done;
+	text_insert_image(help_osd[0], mercenary_splash_palette, mercenary_splash_pixels, 0xff);
+	help_views++;
+	help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
+	if (!help_osd[1])
+		goto done;
+	text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
+	text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
+		"Emulation:\n"
+		"        Press `PAUSE' to toggle this help screen on or off.\n"
+		"        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
+		"        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
+		"        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
+		"        Press `CTRL' + `B' to toggle between large / small Benson.\n"
+		"        Press `CTRL' + `V' to toggle video filter on / off.\n"
+		"        Press `CTRL' + `A' to toggle audio filter on / off.\n"
+		"        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
+		"        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
+		"        Press `CTRL' + `1' or `2' to insert or `0' to remove mission disk.\n"
+#ifdef HAVE_OVR
+		"        Press `CTRL' + `O' to reset observer position.\n"
+#endif
+		"\n"
+		"Answer to a Question:\n"
+		"        Press `O' (not Zero) for OK and other key for NO.\n"
+		"\n"
+		"Walking / Driving / Flying:\n"
+		"        Use cursor keys as joystick, to move player / craft.\n"
+		"        Press `R' for running, 'W' for walking speed.\n"
+		"        Press `B' to board, `L' to leave.\n"
+		"        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
+		"        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
+		"        Press `SPACE' to stop craft.\n"
+		"        Press `ESCAPE' to activate escape sequence on crafts.\n"
+		"        Press `T' for turbo on certain craft.\n"
+		"        Press `END' as joystick's fire button.\n"
+		"\n"
+		"Elevator:\n"
+		"        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
+		"\n"
+		"Inside a transporter:\n"
+		"        Press `1'...`0' to select destination.\n"
+		"\n"
+		"Items:\n"
+		"        Press `SHFIT' + cursor left / right keys to choose item.\n"
+		"        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
+		"        Press `NUMPAD Enter' to select certain items.\n"
+		"        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
+		"        Press `NUMPAD *' to read entry\n"
+		"Saving / Loading / Pause:\n"
+		"        Press `INSERT' to loading and saving options.\n"
+		"        Press `ENTER' to pause game, other key to continue.\n"
+		,HELP_ALPHA, 1, 2, 5, 0);
+		help_views++;
+#ifdef HAVE_OVR
+	help_osd[2] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
+	if (!help_osd[2])
+		goto done;
+	text_render(help_osd[2], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
+	text_render(help_osd[2], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
+		"Emulation using Controller:\n"
+		"        Press `A' or 'X' button to toggle this help screen on or off.\n"
+		"        Press 'B' or 'Y' button to reset observer position. (importaint!)\n"
+		"        To have a virtual keyboard, point right hand below control pannel.\n"
+		"        Point to a key on keyboard. The key will highlight.\n"
+		"        Pull `Trigger' on right controller to enter the highlighted key.\n"
+		"\n"
+		"Walking / Driving / Flying using Controller:\n"
+		"        Use thumb stick on right controller, to move player / craft.\n"
+		"        Move thumb stick forth and back to walk, left and right to rotate.\n"
+		"        Pull `Trigger' on right controller to change orientation.\n"
+		"        Press `X' button to board, `Y' button to leave.\n"
+		"        Move thumb stick on left controller to drive/fly forward or backward.\n"
+		"        Pull `Trigger' on left controller stop craft.\n"
+		"        Press thumb stick on left controller for escape sequence and stop it.\n"
+		"        Pull `Trigger' on right controller to fire.\n"
+		"\n"
+		"For all other game function, use the virtual or real keyboard!\n"
+		,HELP_ALPHA, 1, 2, 5, 0);
+		help_views++;
+#endif
+	info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
+	if (!info_osd)
+		goto done;
+
+	/* init audio */
+	sound_init(SOUND_SAMPLERATE, sound_irq);
+
+	/* start cpu */
+	reset_cpu();
+
+	if (config_skip_intro)
+		skip_intro();
+
+	/* run game */
+	main_loop();
+
+done:
+	exit_opengl();
+#ifdef HAVE_OVR
+	exit_ovr();
+#endif
+	exit_sdl();
+
+	if (chipreg)
+		free(chipreg);
+	if (stop_event)
+		free(stop_event);
+	if (memory)
+		free(memory);
+	if (sound_buffer)
+		free(sound_buffer);
+	if (image)
+		free(image);
+	while (help_views) {
+		help_views--;
+		if (help_osd[help_views])
+			free(help_osd[help_views]);
+	}
+	if (info_osd)
+		free(info_osd);
+
+	return 0;
+}
+