X-Git-Url: https://jasonwoof.com/gitweb/?p=vor.git;a=blobdiff_plain;f=main.c;h=91af5247198b555b317f1f223ce1d0b8e34911fe;hp=5b3ce62d88b7898dd4ba2e8b9414879a9828bdd2;hb=fd76673983c406545f8fe1c89a9202760f30e4e9;hpb=2cd765cf4e0de31198729cafee801c205e77bdc3

diff --git a/main.c b/main.c
index 5b3ce62..91af524 100644
--- a/main.c
+++ b/main.c
@@ -27,23 +27,21 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "SFont.h"
+#include "font.h"
 
 #include "args.h"
 #include "common.h"
 #include "config.h"
 #include "dust.h"
 #include "file.h"
+#include "float.h"
 #include "globals.h"
 #include "mt.h"
 #include "rocks.h"
 #include "score.h"
 #include "sprite.h"
 #include "sound.h"
-
-#ifdef WIN32
-#define SDL_SetAlpha(surf, flag, alpha)
-#endif
+#include "autopilot.h"
 
 // ************************************* VARS
 // SDL_Surface global variables
@@ -59,20 +57,28 @@ SDL_Surface
 	*surf_font_big;	// The big font
 	
 
-SFont_Font *g_font;
+font *g_font;
+
+struct dot {
+	int active;
+	float x, y;
+	float dx, dy;
+	float mass;   // in DOT_MASS_UNITs
+	float decay;  // rate at which to reduce mass.
+	int heat;     // heat multiplier (color).
+};
 
-// Structure global variables
-struct enginedots edot[MAXENGINEDOTS], *dotptr = edot;
-struct bangdots bdot[MAXBANGDOTS], *bdotptr = bdot;
+struct dot edot[MAXENGINEDOTS], *dotptr = edot;
+struct dot bdot[MAXBANGDOTS];
 
 // Other global variables
 char topline[1024];
 char *initerror = "";
 
-struct ship ship = { SHIP, 0, NULL, XSIZE/2, YSIZE/2, SCREENDXMIN, 0.0 };
+struct ship ship = { SHIP, 0, NULL, XSIZE/2, YSIZE/2, BARRIER_SPEED, 0.0 };
 	  
-float screendx = SCREENDXMIN, screendy = 0.0;
-float back_dist;
+float screendx = BARRIER_SPEED, screendy = 0.0;
+float dist_ahead;
 
 // all movement is based on t_frame.
 unsigned long frames, start, end;
@@ -80,12 +86,11 @@ float t_frame;  // length of this frame (in ticks = 1/20th second)  adjusted for
 int ms_frame;   // length of this frame (milliseconds)
 int ms_end;     // end of this frame (milliseconds)
 
-int bang = false;
-float bangx, bangy, bangdx, bangdy;
+float gamespeed = 1.00;
 
 int score;
 
-float fadetimer = 0, faderate;
+float fadetimer = 0;
 
 int pausedown = 0, paused = 0;
 
@@ -124,7 +129,7 @@ char *data_dir;
 extern char *optarg;
 extern int optind, opterr, optopt;
 
-#define TO_TICKS(seconds) ((seconds)*20*opt_gamespeed)
+#define TO_TICKS(seconds) ((seconds)*20*gamespeed)
 
 // ************************************* FUNCS
 
@@ -136,107 +141,11 @@ init_engine_dots() {
 	}
 }
 
-void
-new_bang_dots(int xbang, int ybang, int dx, int dy, SDL_Surface *s)
-{
-	int i, n, x, y;
-	uint16_t *pixel, c;
-	uint32_t colorkey;
-	int row_inc;
-	double theta, r;
-
-	n = 24.0 * t_frame;
-	pixel = s->pixels;
-	row_inc = s->pitch/sizeof(uint16_t) - s->w;
-	colorkey = s->format->colorkey;
-
-	SDL_LockSurface(s);
-
-	for(i=0; i<n; i++) {
-		pixel = s->pixels;
-		for(y=0; y<s->h; y++) {
-			for(x = 0; x<s->w; x++) {
-				c = *pixel++;
-				if(c && c != colorkey) {
-					theta = frnd()*M_PI*2;
-					r = frnd(); r = 1 - r*r;
-
-					bdot[bd2].dx = 45*r*cos(theta) + dx;
-					bdot[bd2].dy = 45*r*sin(theta) + dy;
-					bdot[bd2].x = x + xbang;
-					bdot[bd2].y = y + ybang;
-					bdot[bd2].c = (i < n-3) ? 0 : c;
-					bdot[bd2].life = 100;
-					bdot[bd2].decay = frnd()*3 + 1;
-					bdot[bd2].active = 1;
-
-					bd2 = (bd2+1) % MAXBANGDOTS;
-				}
-				pixel += row_inc;
-			}
-		}
-	}
-
-	SDL_UnlockSurface(s);
-}
-
-void
-move_bang_dots(float ticks)
-{
-	int i;
-	Sprite *hit;
-
-	for(i=0; i<MAXBANGDOTS; i++) {
-		if(!bdot[i].active) continue;
-
-		// decrement life and maybe kill
-		bdot[i].life -= bdot[i].decay;
-		if(bdot[i].life < 0) { bdot[i].active = 0; continue; }
-		
-		// move and clip
-		bdot[i].x += (bdot[i].dx - screendx)*ticks;
-		bdot[i].y += (bdot[i].dy - screendy)*ticks;
-		if(bdot[i].x < 0 || bdot[i].x >= XSIZE || bdot[i].y < 0 || bdot[i].y >= YSIZE) {
-			bdot[i].active = 0;
-			continue;
-		}
-
-		// check collisions
-		if((hit = pixel_collides(bdot[i].x, bdot[i].y))) {
-			if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
-				bdot[i].active = 0;
-				hit->dx += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dx / sprite_mass(hit);
-				hit->dy += ENGINE_DOT_WEIGHT * bdot[i].life * bdot[i].dy / sprite_mass(hit);
-				continue;
-			}
-		}
-	}
-}
-
-
-void
-draw_bang_dots(SDL_Surface *s)
-{
-	int i;
-	uint16_t *pixels, *pixel, c;
-	int row_inc = s->pitch/sizeof(uint16_t);
-
-	pixels = (uint16_t *) s->pixels;
-
-	for(i=0; i<MAXBANGDOTS; i++) {
-		if(!bdot[i].active) continue;
-
-		pixel = pixels + row_inc*(int)(bdot[i].y) + (int)(bdot[i].x);
-		if(bdot[i].c) c = bdot[i].c; else c = heatcolor[(int)(bdot[i].life)*3];
-		*pixel = c;
-	}
-}
-
 
 void
-new_engine_dots(float time_span) {
+new_engine_dots(void) {
 	int dir, i;
-	int n = time_span * ENGINE_DOTS_PER_TIC;
+	int n = t_frame * ENGINE_DOTS_PER_TIC;
 	float a, r;  // angle, random length
 	float dx, dy;
 	float hx, hy; // half ship width/height.
@@ -257,10 +166,11 @@ new_engine_dots(float time_span) {
 				dx = r * cos(a);
 				dy = r * -sin(a);  // screen y is "backwards".
 
-				dotptr->active = 1;
+				dotptr->decay = 3;
+				dotptr->heat = 6;
 
 				// dot was created at a random time during the time span
-				time = frnd() * time_span; // this is how long ago
+				time = frnd() * t_frame; // this is how long ago
 
 				// calculate how fast the ship was going when this engine dot was
 				// created (as if it had a smooth acceleration). This is used in
@@ -275,81 +185,140 @@ new_engine_dots(float time_span) {
 
 				// the starting position (not speed) of the dot is calculated as
 				// though the ship were traveling at a constant speed for this
-				// time_span.
+				// t_frame.
 				dotptr->x = (ship.x - (ship.dx - screendx) * time) + s[dir]*hx;
 				dotptr->y = (ship.y - (ship.dy - screendy) * time) + s[(dir+1)&3]*hy;
 				if(dir&1) {
 					dotptr->dx = past_ship_dx + 2*dx;
 					dotptr->dy = past_ship_dy + 20*dy;
-					dotptr->life = 60 * fabs(dy);
+					dotptr->mass = 60 * fabs(dy);
 				} else {
 					dotptr->dx = past_ship_dx + 20*dx;
 					dotptr->dy = past_ship_dy + 2*dy;
-					dotptr->life = 60 * fabs(dx);
+					dotptr->mass = 60 * fabs(dx);
 				}
 
 				// move the dot as though it were created in the past
 				dotptr->x += (dotptr->dx - screendx) * time;
 				dotptr->y += (dotptr->dy - screendy) * time;
 
-				if(dotptr - edot < MAXENGINEDOTS-1) dotptr++;
-				else dotptr = edot;
+				if(!fclip(dotptr->x, XSIZE) && !fclip(dotptr->y, YSIZE)) {
+					dotptr->active = 1;
+					if(dotptr - edot < MAXENGINEDOTS-1) {
+						dotptr++;
+					} else {
+						dotptr = edot;
+					}
+				}
 			}
 		}
 	}
 }
 
+
 void
-move_engine_dots(float ticks) {
-	int i;
-	Sprite *hit;
+new_bang_dots(struct sprite *s)
+{
+	int i, n, x, y;
+	uint16_t *pixel, c;
+	uint32_t colorkey;
+	int row_inc;
+	double theta, r;
+	SDL_Surface *img = s->image;
 
-	for(i = 0; i<MAXENGINEDOTS; i++) {
-		if(!edot[i].active) continue;
+	n = 20;
+	pixel = img->pixels;
+	row_inc = img->pitch/sizeof(uint16_t) - img->w;
+	colorkey = img->format->colorkey;
+
+	if(SDL_MUSTLOCK(img)) { SDL_LockSurface(img); }
+
+	for(i=0; i<n; i++) {
+		pixel = img->pixels;
+		for(y=0; y<img->h; y++) {
+			for(x = 0; x<img->w; x++) {
+				c = *pixel++;
+				if(c && c != colorkey) {
+					theta = frnd()*M_PI*2;
+					r = frnd(); r = 1 - r*r;
+
+					bdot[bd2].dx = 45*r*cos(theta) + s->dx;
+					bdot[bd2].dy = 45*r*sin(theta) + s->dy;
+					bdot[bd2].x = x + s->x;
+					bdot[bd2].y = y + s->y;
+					bdot[bd2].mass = frnd() * 99;
+					bdot[bd2].decay = frnd()*1.5 + 0.5;
+					bdot[bd2].heat = 3;
+					bdot[bd2].active = 1;
 
-		edot[i].x += (edot[i].dx - screendx)*ticks;
-		edot[i].y += (edot[i].dy - screendy)*ticks;
-		edot[i].life -= t_frame*3;
-		if(edot[i].life < 0 || edot[i].x<0 || edot[i].x >= XSIZE || edot[i].y < 0 || edot[i].y >= YSIZE) {
-			edot[i].active = 0;
+					bd2 = (bd2+1) % MAXBANGDOTS;
+				}
+				pixel += row_inc;
+			}
 		}
+	}
 
-		// check collisions
-		if((hit = pixel_collides(edot[i].x, edot[i].y))) {
-			if(hit->type != SHIP) { // they shouldn't hit the ship, but they do
-				edot[i].active = 0;
-				hit->dx += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dx / sprite_mass(hit);
-				hit->dy += ENGINE_DOT_WEIGHT * edot[i].life * edot[i].dy / sprite_mass(hit);
-				continue;
+	if(SDL_MUSTLOCK(img)) { SDL_UnlockSurface(img); }
+}
+
+
+void
+move_dot(struct dot *d)
+{
+	Sprite *hit;
+	float mass;
+
+	if(d->active) {
+		d->x += (d->dx - screendx) * t_frame;
+		d->y += (d->dy - screendy) * t_frame;
+		d->mass -= t_frame * d->decay;
+		if(d->mass < 0 || fclip(d->x, XSIZE) || fclip(d->y, YSIZE))
+			d->active = 0; 
+		else {
+			hit = pixel_collides(d->x, d->y);
+			if(hit) if(hit->type != SHIP) {
+				d->active = 0;
+				mass = sprite_mass(hit);
+				hit->dx += DOT_MASS_UNIT * d->mass * (d->dx - hit->dx) / mass;
+				hit->dy += DOT_MASS_UNIT * d->mass * (d->dy - hit->dy) / mass;
 			}
 		}
 	}
 }
 
 void
-draw_engine_dots(SDL_Surface *s) {
+move_dots(void)
+{
 	int i;
-	uint16_t c;
-	uint16_t *pixels = (uint16_t *) s->pixels;
-	int row_inc = s->pitch/sizeof(uint16_t);
-	int heatindex;
 
-	for(i = 0; i<MAXENGINEDOTS; i++) {
-		if(!edot[i].active) continue;
+	for(i=0; i<MAXBANGDOTS; i++) move_dot(&bdot[i]);
+	for(i=0; i<MAXENGINEDOTS; i++) move_dot(&edot[i]);
+}
+
+
+void
+draw_dot(struct dot *d)
+{
+	uint16_t *pixels, *pixel;
+	int row_inc;
 
-		heatindex = edot[i].life * 6;
-		c = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
-		pixels[row_inc*(int)(edot[i].y) + (int)(edot[i].x)] = c;
+	if(d->active) {
+		pixels = (uint16_t *) surf_screen->pixels;
+		row_inc = surf_screen->pitch / sizeof(uint16_t);
+		pixel = pixels + (int)d->y * row_inc + (int)d->x;
+		*pixel = heatcolor[min(3*W-1, (int)(d->mass * d->heat))];
 	}
 }
 
 void
-draw_dots(SDL_Surface *s) {
-	SDL_LockSurface(s);
-	draw_dust(s);
-	draw_engine_dots(s);
-	draw_bang_dots(s);
-	SDL_UnlockSurface(s);
+draw_dots(void) {
+	int i;
+
+	if(SDL_MUSTLOCK(surf_screen)) { SDL_LockSurface(surf_screen); }
+	draw_dust();
+	for(i=0; i<MAXBANGDOTS; i++) draw_dot(&bdot[i]);
+	for(i=0; i<MAXENGINEDOTS; i++) draw_dot(&edot[i]);
+	if(SDL_MUSTLOCK(surf_screen)) { SDL_UnlockSurface(surf_screen); }
 }
 
 SDL_Surface *
@@ -374,6 +343,10 @@ load_ship(void)
 	load_sprite(SPRITE(&ship), "ship.png");
 }
 
+void font_cleanup() {
+	font_free(g_font);
+}
+
 int
 init(void) {
 
@@ -436,9 +409,11 @@ init(void) {
 	// Load the font image
 	s = add_data_path("font.png");
 	if(s) {
-		NULLERROR(surf_font_big = IMG_Load(s));
-		free(s);
-		g_font = SFont_InitFont(surf_font_big);
+		g_font = font_load(s);
+		atexit(&font_cleanup);
+	} else {
+		fprintf(stderr, "could create path to font\n");
+		exit(1);
 	}
 
 	init_engine_dots();
@@ -474,22 +449,15 @@ draw_game_over(void)
 	int x;
 	char *text0, *text1;
 	SDL_Rect dest;
-	float a_game = 0, a_over = 0;
-
-	// fade in "GAME", then "OVER".
-	a_game = min(1.0, faderate*fadetimer/3.0);
-	if(a_game == 1.0) a_over = min(1.0, faderate*fadetimer/3.0 - 1);
 
 	fadetimer += t_frame;
 
 	dest.x = (XSIZE-surf_b_game->w)/2;
 	dest.y = (YSIZE-surf_b_game->h)/2-40;
-	SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(a_game*(200 + 55*cos(fadetimer))));
 	SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 
 	dest.x = (XSIZE-surf_b_over->w)/2;
 	dest.y = (YSIZE-surf_b_over->h)/2 + 40;
-	SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(a_over*(200 + 55*sin(fadetimer))));
 	SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 
 	if(new_high_score(score)) {
@@ -500,11 +468,11 @@ draw_game_over(void)
 		text1 = msgs[g_easy][1];
 	}
 
-	x = (XSIZE-SFont_TextWidth(g_font,text0))/2 + cos(fadetimer/9)*10;
-	SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/6)*5,text0);
+	x = (XSIZE-font_width(text0))/2 + cos(fadetimer/9)*10;
+	font_write(x,YSIZE-100 + cos(fadetimer/6)*5,text0);
 
-	x = (XSIZE-SFont_TextWidth(g_font,text1))/2 + sin(fadetimer/9)*10;
-	SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/4)*5,text1);
+	x = (XSIZE-font_width(text1))/2 + sin(fadetimer/9)*10;
+	font_write(x,YSIZE-50 + sin(fadetimer/4)*5,text1);
 }
 
 void
@@ -518,75 +486,85 @@ draw_title_page(void)
 
 	dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 	dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
-	SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer)));
 	SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 
 	dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 	dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
-	SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 	SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 
 	dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 	dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
-	SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 	SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 
 	text = msgs[g_easy][(int)(fadetimer/35)%NSEQUENCE];
-	x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
-	SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
+	x = (XSIZE-font_width(text))/2 + cos(fadetimer/4.5)*10;
+	font_write(x,YSIZE-100 + cos(fadetimer/3)*5,text);
 
 	text = "Version " VERSION;
-	x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
-	SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
+	x = (XSIZE-font_width(text))/2 + sin(fadetimer/4.5)*10;
+	font_write(x,YSIZE-50 + sin(fadetimer/2)*5,text);
 }
 
 void
-draw(void) {
-
+draw(void)
+{
 	SDL_FillRect(surf_screen,NULL,0);  // black background
-	draw_dots(surf_screen);             // background dots
+	draw_dots();            // background dots
 	draw_sprite(SPRITE(&ship));
 	draw_rocks();
 
 	show_lives();
 	show_score();
 
-	// If it's game over, show the game over graphic in the dead centre
 	switch (state) {
 		case GAME_OVER: draw_game_over(); break;
 
 		case TITLE_PAGE: draw_title_page(); break;
 
-		case HIGH_SCORE_ENTRY:
-			play_tune(TUNE_HIGH_SCORE_ENTRY);
-		// FALL THROUGH TO
+		case HIGH_SCORE_ENTRY: play_tune(TUNE_HIGH_SCORE_ENTRY);
+			// and fall through to
 		case HIGH_SCORE_DISPLAY:
 			// Display de list o high scores mon.
-			display_scores(surf_screen, 150,50);
+			display_scores(150,50);
 			break;
 		case GAMEPLAY:
 		case DEAD_PAUSE:
 			; // no action necessary
 	}
 
-	collisions();
-
 	// Update the surface
 	SDL_Flip(surf_screen);
 }
 
 static inline void
-kill_ship(Sprite *ship)
+kill_ship(struct ship *ship)
 {
-	ship->flags = MOVE;
-	bang = true;
+	play_sound(SOUND_BANG);
+	new_bang_dots(SPRITE(ship));
+	if(--ship->lives) {
+		state = DEAD_PAUSE;
+		state_timeout = DEAD_PAUSE_LENGTH;
+		// want ship to be invisible, but keep drifting at sqrt(speed)
+		// to leave it in the middle of the space from the explosion.
+		ship->flags = MOVE;
+		ship->dx = (ship->dx < 0) ? -sqrt(-ship->dx) : sqrt(ship->dx);
+		ship->dy = (ship->dy < 0) ? -sqrt(-ship->dy) : sqrt(ship->dy);
+		if(ship->dx < BARRIER_SPEED) ship->dx = BARRIER_SPEED;
+	} else {
+		state = GAME_OVER;
+		state_timeout = 200.0;
+		fadetimer = 0.0;
+		ship->flags = 0;
+		// scrolling is based on the ship speed, so we need to reset it.
+		ship->dx = BARRIER_SPEED; ship->dy = 0;
+	}
 }
 
 void
 do_collision(Sprite *a, Sprite *b)
 {
-	if(a->type == SHIP) kill_ship(a);
-	else if (b->type == SHIP) kill_ship(b);
+	if(a->type == SHIP) kill_ship((struct ship *)a);
+	else if(b->type == SHIP) kill_ship((struct ship *)b);
 	else bounce(a, b);
 }
 
@@ -604,12 +582,13 @@ init_score_entry(void)
 
 // Count down the state timer, and change state when it gets to zero or less;
 void
-update_state(float ticks)
+update_state(void)
 {
-	state_timeout -= ticks*3;
+	state_timeout -= t_frame*3;
 	if(state_timeout > 0) return;
 
 	switch(state) {
+		case GAMEPLAY: break;  // no action necessary
 		case DEAD_PAUSE:
 			// Restore the ship and continue playing
 			ship.flags = DRAW|MOVE|COLLIDE;
@@ -634,8 +613,6 @@ update_state(float ticks)
 			state = HIGH_SCORE_DISPLAY;
 			state_timeout = 200.0;
 			break;
-		case GAMEPLAY:
-			; // no action necessary
 	}
 }
 
@@ -648,19 +625,21 @@ gameloop() {
 	for(;;) {
 		ms_frame = SDL_GetTicks() - ms_end;
 		ms_end += ms_frame;
-		t_frame = opt_gamespeed * ms_frame / 50;
+		if(ms_frame > 50) {
+			ms_frame = 50;
+		}
+		t_frame = gamespeed * ms_frame / 50;
 		frames++;
 
+		if(opt_autopilot) {
+			autopilot(t_frame);
+		}
+
 		while(SDL_PollEvent(&e)) {
 			switch(e.type) {
 				case SDL_QUIT: return;
-				case SDL_KEYUP:
-					if(e.key.keysym.sym == SDLK_ESCAPE
-					   || e.key.keysym.sym == SDLK_q)
-						return;
-					break;
 				case SDL_KEYDOWN:
-					if(state == HIGH_SCORE_ENTRY)
+					if(state == HIGH_SCORE_ENTRY) {
 						if(!process_score_input(&e.key.keysym)) {
 							// Write the high score table to the file
 							write_high_score_table();
@@ -669,10 +648,20 @@ gameloop() {
 							state_timeout = 200;
 							play_tune(TUNE_TITLE_PAGE);
 						}
+					} else if(e.key.keysym.sym == SDLK_q) {
+						return;
+					}
+
+					if(e.key.keysym.sym == SDLK_ESCAPE) {
+						return;
+					}
 					break;
 			}
 		}
 		keystate = SDL_GetKeyState(NULL);
+		if(opt_autopilot) {
+			autopilot_fix_keystates(keystate);
+		}
 
 		if(state == GAMEPLAY) {
 			if(!paused) {
@@ -682,6 +671,10 @@ gameloop() {
 				if(keystate[SDLK_DOWN]  || keystate[SDLK_t]) { ship.dy += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<1;}
 				if(keystate[SDLK_RIGHT] || keystate[SDLK_n]) { ship.dx += THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<2;}
 				if(keystate[SDLK_UP]    || keystate[SDLK_c]) { ship.dy -= THRUSTER_STRENGTH*t_frame; ship.jets |= 1<<3;}
+				if(ship.jets) {
+					ship.dx = fconstrain2(ship.dx, -50, 50);
+					ship.dy = fconstrain2(ship.dy, -50, 50);
+				}
 				if(keystate[SDLK_3])		{ SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 			}
 
@@ -697,69 +690,46 @@ gameloop() {
 		}
 
 		if(!paused) {
-			update_state(t_frame);
-
-			if(state == DEAD_PAUSE && bangx < 60) bangx = 60;
+			update_state();
 
 			// SCROLLING
-			tmp = (ship.y+ship.h/2+ship.dy*t_frame-YSCROLLTO)/25 + (ship.dy-screendy);
+			tmp = (ship.y+ship.h/2 + ship.dy*t_frame - YSCROLLTO)/25 + (ship.dy-screendy);
 			screendy += tmp * t_frame/12;
-			tmp = (ship.x+ship.w/2+ship.dx*t_frame-XSCROLLTO)/25 + (ship.dx-screendx);
+			tmp = (ship.x+ship.w/2 + ship.dx*t_frame - XSCROLLTO)/25 + (ship.dx-screendx);
 			screendx += tmp * t_frame/12;
 			// taper off so we don't hit the barrier abruptly.
 			// (if we would hit in < 2 seconds, adjust to 2 seconds).
-			if(back_dist + (screendx - SCREENDXMIN)*TO_TICKS(2) < 0)
-				screendx = SCREENDXMIN - (back_dist/TO_TICKS(2));
-			back_dist += (screendx - SCREENDXMIN)*t_frame;
-			if(opt_max_lead >= 0) back_dist = min(back_dist, opt_max_lead);
+			if(dist_ahead + (screendx - BARRIER_SPEED)*TO_TICKS(2) < 0)
+				screendx = BARRIER_SPEED - (dist_ahead/TO_TICKS(2));
+			dist_ahead += (screendx - BARRIER_SPEED)*t_frame;
+			if(MAX_DIST_AHEAD >= 0) dist_ahead = min(dist_ahead, MAX_DIST_AHEAD);
 
-			// move bang center
-			bangx += (bangdx - screendx)*t_frame;
-			bangy += (bangdy - screendy)*t_frame;
+			move_sprites();
+			move_dots();
+			move_dust();
 
-			move_sprites(t_frame);
-			move_engine_dots(t_frame);
-			move_bang_dots(t_frame);
-			move_dust(t_frame);
+			new_rocks();
 
 			// BOUNCE off left or right edge of screen
 			if(ship.x < 0 || ship.x+ship.w > XSIZE) {
 				ship.x -= (ship.dx-screendx)*t_frame;
-				ship.dx = screendx - (ship.dx-screendx)*opt_bounciness;
+				ship.dx = screendx - (ship.dx-screendx)*BOUNCINESS;
+				ship.x = fconstrain(ship.x, XSIZE - ship.w);
 			}
 
 			// BOUNCE off top or bottom of screen
 			if(ship.y < 0 || ship.y+ship.h > YSIZE) {
 				ship.y -= (ship.dy-screendy)*t_frame;
-				ship.dy = screendy - (ship.dy-screendy)*opt_bounciness;
+				ship.dy = screendy - (ship.dy-screendy)*BOUNCINESS;
+				ship.y = fconstrain(ship.y, YSIZE - ship.h);
 			}
 
-			new_rocks(t_frame);
-			new_engine_dots(t_frame);
+			new_engine_dots();
 
-			draw();
+			collisions(); // must happen after ship bouncing because it puts pixels where the ship is (thus the ship must be on the screen)
 
-			if(state == GAMEPLAY && bang) {
-				// Died
-				bang = false;
-				play_sound(SOUND_BANG); // Play the explosion sound
-				bangx = ship.x; bangy = ship.y; bangdx = ship.dx; bangdy = ship.dy;
-				new_bang_dots(ship.x,ship.y,ship.dx,ship.dy,ship.image);
-
-				if(--ship.lives) {
-					state = DEAD_PAUSE;
-					state_timeout = DEAD_PAUSE_LENGTH;
-					ship.dx = (ship.dx < 0) ? -sqrt(-ship.dx) : sqrt(ship.dx);
-					ship.dy = (ship.dy < 0) ? -sqrt(-ship.dy) : sqrt(ship.dy);
-					if(ship.dx < SCREENDXMIN) ship.dx = SCREENDXMIN;
-				} else {
-					state = GAME_OVER;
-					ship.dx = SCREENDXMIN; ship.dy = 0;
-					state_timeout = 200.0;
-					fadetimer = 0.0;
-					faderate = t_frame;
-				}
-			}
+
+			draw();
 
 			// new game
 			if((keystate[SDLK_SPACE] || keystate[SDLK_1] || keystate[SDLK_2])
@@ -773,17 +743,17 @@ gameloop() {
 						g_easy = 0;
 						initial_rocks = NORMAL_I_ROCKS;
 						final_rocks = NORMAL_F_ROCKS;
-						if(opt_gamespeed == EASY_GAMESPEED)
-							opt_gamespeed = NORMAL_GAMESPEED;
+						if(gamespeed == EASY_GAMESPEED)
+							gamespeed = NORMAL_GAMESPEED;
 					} else if(keystate[SDLK_1]) {
 						g_easy = 1;
 						initial_rocks = EASY_I_ROCKS;
 						final_rocks = EASY_F_ROCKS;
-						opt_gamespeed = EASY_GAMESPEED;
+						gamespeed = EASY_GAMESPEED;
 					}
 					reset_sprites();
 					reset_rocks();
-					screendx = SCREENDXMIN; screendy = 0;
+					screendx = BARRIER_SPEED; screendy = 0;
 
 					ship.x = XSIZE/2.2; ship.y = YSIZE/2 - ship.w/2;
 					ship.dx = screendx; ship.dy = screendy;
@@ -813,7 +783,7 @@ main(int argc, char **argv) {
 	if(!parse_opts(argc, argv)) return 1;
 
 	if(init()) {
-		printf ("ta: '%s'\n",initerror);
+		printf ("vor: SDL error: '%s'\n",initerror);
 		return 1;
 	}