X-Git-Url: https://jasonwoof.com/gitweb/?p=vor.git;a=blobdiff_plain;f=rocks.c;h=428c697ada20a87cb86a5a6aaad16ac7b100fa86;hp=fe66c4c3ba5bdc4effced5b5859c9cb06b53defb;hb=ecb22d95c5c67e92873ba1f518711dcf3e86f181;hpb=46dacbe75dac20a1c6e1b61a2eb99ca25fc971ec

diff --git a/rocks.c b/rocks.c
index fe66c4c..428c697 100644
--- a/rocks.c
+++ b/rocks.c
@@ -3,189 +3,383 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "common.h"
 #include "config.h"
 #include "file.h"
 #include "globals.h"
+#include "mt.h"
 #include "rocks.h"
 #include "shape.h"
 
+SDL_Surface *load_image(char *filename);
+
 struct rock_struct {
+	struct rock_struct *next;
 	float x,y,dx,dy;
-	int active;
-	int dead;  // has been blown out of the way
-	           // to make room for a new ship appearing.
 	SDL_Surface *image;
 	struct shape *shape;
 	int type_number;
 }; 
 
-struct rock_struct rock[MAXROCKS], *rockptr = rock;
+struct rock_struct rocks[MAXROCKS], *free_rocks;
 
-float rockrate,rockspeed;
+struct rock_struct **rock_buckets[2];
+int n_buckets;
+// we have two sets of buckets -- this variable tells which we are using.
+int p;
+int bw, bh;
+int grid_size;
 
 SDL_Surface *surf_rock[NROCKS];
 struct shape rock_shapes[NROCKS];
 
-int countdown = 0;
+// timers for rock generation.
+float rtimers[4];
+
+uint32_t nrocks;
+float nrocks_timer;
+float nrocks_inc_ticks = 2*60*20/(F_ROCKS-I_ROCKS);
+
+// constants for rock generation.
+#define KH (32*20)  // 32 s for a speed=1 rock to cross the screen horizontally.
+#define KV (24*20)  // 24 s for a speed=1 rock to cross the screen vertically.
+#define RDX 2.5  // range for rock dx values (+/-)
+#define RDY 2.5  // range for rock dy values (+/-)
+
+static inline struct rock_struct **
+bucket(int x, int y, int p)
+{
+	int b = (x+grid_size)/grid_size + bw*((y+grid_size)/grid_size);
+	return &rock_buckets[p][b];
+}
+
+void
+init_buckets(void)
+{
+	int scr_grid_w = (XSIZE+2*grid_size-1) / grid_size;
+	int scr_grid_h = (YSIZE+2*grid_size-1) / grid_size;
+	bw = 1 + scr_grid_w + 1;
+	bh = 1 + scr_grid_h + 1;
+	n_buckets = bw * bh;
+	
+	rock_buckets[0] = malloc(n_buckets * sizeof(struct rock_struct *));
+	rock_buckets[1] = malloc(n_buckets * sizeof(struct rock_struct *));
+	if(!rock_buckets[0] || !rock_buckets[1]) {
+		fprintf(stderr, "Can't allocate rock buckets.\n");
+		exit(1);
+	}
+	p = 0;
+}
+
+void
+transfer_rock(struct rock_struct *r, struct rock_struct **from, struct rock_struct **to)
+{
+	*from = r->next;
+	r->next = *to;
+	*to = r;
+}
 
-float rnd(void);
+void
+reset_rocks(void)
+{
+	int i;
 
-uint32_t area;
+	for(i=0; i<MAXROCKS; i++) rocks[i].image = NULL;
+	rocks[0].next = NULL; free_rocks = &rocks[MAXROCKS-1];
+	for(i = 1; i<MAXROCKS; i++) rocks[i].next = &rocks[i-1];
+	for(i = 0; i<n_buckets; i++) {
+		rock_buckets[0][i] = NULL;
+		rock_buckets[1][i] = NULL;
+	}
+
+	nrocks = I_ROCKS;
+	nrocks_timer = 0;
+}
+
+#define ROCK_LEN sizeof("sprites/rockXX.png")
 
 int
 init_rocks(void)
 {
 	int i;
-	char a[MAX_PATH_LEN];
-	SDL_Surface *temp;
-
-	area = 0;
+	char a[ROCK_LEN];
+	int maxw=0, maxh=0;
 
 	for(i = 0; i<NROCKS; i++) {
-		snprintf(a,MAX_PATH_LEN,add_path("sprites/rock%02d.png"),i);
-		NULLERROR(temp = IMG_Load(a));
-		NULLERROR(surf_rock[i] = SDL_DisplayFormat(temp));
+		snprintf(a, ROCK_LEN, "sprites/rock%02d.png", i);
+		NULLERROR(surf_rock[i] = load_image(a));
 		get_shape(surf_rock[i], &rock_shapes[i]);
+		maxw = max(maxw, rock_shapes[i].w);
+		maxh = max(maxh, rock_shapes[i].h);
 	}
+	grid_size = max(maxw, maxh) * 3 / 2;
+	init_buckets();
+	reset_rocks();
 	return 0;
 }
 
+enum { LEFT, RIGHT, TOP, BOTTOM };
+
+
+// compute the number of rocks/tick that should be coming from each side,
+// and the speed ranges of rocks coming from each side
 void
-new_rocks(void)
+rock_sides(float *ti, float *speed_min, float *speed_max)
 {
-	if(--countdown <= 0 && (rnd()*100.0<(rockrate += 0.025))) {
-		// Possibly create a rock
-		rockptr++;
-		if(rockptr-rock >= MAXROCKS) {
-			rockptr = rock;
-		}
-		if(!rockptr->active) {
-			rockptr->dx = -(rockspeed)*(1 + rnd());
-			rockptr->dy = rnd()-0.5;
-			rockptr->type_number = random() % NROCKS;
-			rockptr->image = surf_rock[rockptr->type_number];
-			rockptr->shape = &rock_shapes[rockptr->type_number];
-			rockptr->x = (float)XSIZE;
-			rockptr->y = rnd()*(YSIZE + rockptr->image->h);
-			rockptr->active = 1;
-			area += rockptr->shape->area;
+	float dx0,dx1, dy0,dy1;
+	float hfactor, vfactor;
+	int i;
+
+	for(i=0; i<4; i++) ti[i] = 0;
+	for(i=0; i<4; i++) speed_min[i] = 0;
+	for(i=0; i<4; i++) speed_max[i] = 0;
+	hfactor = (float)nrocks/KH; vfactor = (float)nrocks/KV;
+
+	dx0 = -RDX - screendx; dx1 = RDX - screendx;
+	dy0 = -RDY - screendy; dy1 = RDY - screendy;
+
+	if(dx0 < 0) {
+		speed_max[RIGHT] = -dx0;
+		if(dx1 < 0) {
+			// Rocks moving left only. So the RIGHT side of the screen
+			speed_min[RIGHT] = -dx1;
+			ti[RIGHT] = -(dx0+dx1)/2;
+		} else {
+			// Rocks moving left and right
+			speed_max[LEFT] = dx1;
+			ti[RIGHT] = -dx0/2;
+			ti[LEFT] = dx1/2;
 		}
-		if(gamerate>0.1) {
-			countdown = (int)(ROCKRATE/gamerate);
+	} else {
+		// Rocks moving right only. So the LEFT side of the screen
+		speed_min[LEFT] = dx0;
+		speed_max[LEFT] = dx1;
+		ti[LEFT] = (dx0+dx1)/2;
+	}
+	ti[LEFT] *= hfactor;
+	ti[RIGHT] *= hfactor;
+
+	if(dy0 < 0) {
+		speed_max[BOTTOM] = -dy0;
+		if(dy1 < 0) {
+			// Rocks moving up only. So the BOTTOM of the screen
+			speed_min[BOTTOM] = -dy1;
+			ti[BOTTOM] = -(dy0+dy1)/2;
 		} else {
-			countdown = 0;
+			// Rocks moving up and down
+			speed_max[TOP] = dy1;
+			ti[BOTTOM] = -dy0/2;
+			ti[TOP] = dy1/2;
 		}
+	} else {
+		// Rocks moving down only. so the TOP of the screen
+		speed_min[TOP] = dy0;
+		speed_max[TOP] = dy1;
+		ti[TOP] = (dy0+dy1)/2;
 	}
+	ti[TOP] *= vfactor;
+	ti[BOTTOM] *= vfactor;
+}
+
+float
+weighted_rnd_range(float min, float max) {
+	return sqrt(min * min + frnd() * (max * max - min * min));
 }
 
 void
-move_rocks(void)
+new_rocks(void)
 {
 	int i;
+	struct rock_struct *r;
+	float ti[4];
+	float rmin[4];
+	float rmax[4];
 
-	// Move all the rocks
-	for(i = 0; i < MAXROCKS; i++) {
-		if(rock[i].active) {
-			rock[i].x += rock[i].dx*gamerate;
-			rock[i].y += rock[i].dy*gamerate + yscroll;
-			if(rock[i].y > YSIZE || rock[i].y < -rock[i].image->h) {
-				if(rock[i].dead) {
-					area -= rock[i].shape->area;
-					rock[i].dead = 0;
-					rock[i].active = 0;
-				} else {
-					// wrap
-					rock[i].y = (YSIZE - rock[i].image->h) - rock[i].y;
-					rock[i].y += (rock[i].dy*gamerate + yscroll) * 1.01;
-				}
-			}
-			if(rock[i].x < -rock[i].image->w || rock[i].x > XSIZE) {
-				area -= rock[i].shape->area;
-				rock[i].active = 0;
-				rock[i].dead = 0;
+	if(nrocks < F_ROCKS) {
+		nrocks_timer += t_frame;
+		if(nrocks_timer >= nrocks_inc_ticks) {
+			nrocks_timer -= nrocks_inc_ticks;
+			nrocks++;
+		}
+	}
+
+	rock_sides(ti, rmin, rmax);
+
+	// increment timers
+	for(i=0; i<4; i++) rtimers[i] += ti[i]*t_frame;
+
+	// generate rocks
+	for(i=0; i<4; i++) {
+		while(rtimers[i] >= 1) {
+			rtimers[i] -= 1;
+			if(!free_rocks) return;  // sorry, we ran out of rocks!
+			r = free_rocks;
+			r->type_number = urnd() % NROCKS;
+			r->image = surf_rock[r->type_number];
+			r->shape = &rock_shapes[r->type_number];
+			switch(i) {
+				case RIGHT:
+					r->x = XSIZE;
+					r->y = frnd()*(YSIZE + r->image->h);
+
+					r->dx = -weighted_rnd_range(rmin[i], rmax[i]) + screendx;
+					r->dy = RDY*crnd();
+					break;
+				case LEFT:
+					r->x = -r->image->w;
+					r->y = frnd()*(YSIZE + r->image->h);
+
+					r->dx = weighted_rnd_range(rmin[i], rmax[i]) + screendx;
+					r->dy = RDY*crnd();
+					break;
+				case BOTTOM:
+					r->x = frnd()*(XSIZE + r->image->w);
+					r->y = YSIZE;
+
+					r->dx = RDX*crnd();
+					r->dy = -weighted_rnd_range(rmin[i], rmax[i]) + screendy;
+					break;
+				case TOP:
+					r->x = frnd()*(XSIZE + r->image->w);
+					r->y = -r->image->h;
+
+					r->dx = RDX*crnd();
+					r->dy = weighted_rnd_range(rmin[i], rmax[i]) + screendy;
+					break;
 			}
+			transfer_rock(r, &free_rocks, bucket(r->x, r->y, p));
 		}
 	}
 }
 
 void
-reset_rocks(void)
+move_rocks(void)
 {
-	int i;
+	int b;
+	struct rock_struct **head;
+	struct rock_struct *r;
 
-	area = 0;
-	for(i = 0; i<MAXROCKS; i++ ) {
-		rock[i].active = 0;
-		rock[i].dead = 0;
-	}
+	// Move all the rocks
+	for(b=0; b<n_buckets; b++) {
+		head=&rock_buckets[p][b]; r=*head;
+		while(*head) {
+			r=*head;
+
+			// move
+			r->x += (r->dx - screendx)*t_frame;
+			r->y += (r->dy - screendy)*t_frame;
 
-	rockrate = 54.0;
-	rockspeed = 5.0;
+			// clip it, or sort it into the other bucket set
+			// (either way we move it out of this list).
+			if(r->x + r->image->w < 0 || r->x >= XSIZE
+					|| r->y + r->image->h < 0 || r->y >= YSIZE) {
+				transfer_rock(r, head, &free_rocks);
+				r->image = NULL;
+			} else transfer_rock(r, head, bucket(r->x, r->y, 1-p));
+		}
+	}
+	p = 1-p;  // switch current set of buckets.
 }
 
 void
 draw_rocks(void)
 {
 	int i;
-	SDL_Rect src, dest;
+	SDL_Rect dest;
 
-	src.x = 0; src.y = 0;
+	for(i=0; i<MAXROCKS; i++) {
+		if(!rocks[i].image) continue;
+		dest.x = rocks[i].x; dest.y = rocks[i].y;
+		SDL_BlitSurface(rocks[i].image,NULL,surf_screen,&dest);
+	}
+}
 
-	for(i = 0; i<MAXROCKS; i++) {
-		if(rock[i].active) {
-			src.w = rock[i].image->w;
-			src.h = rock[i].image->h;
+int
+hit_in_bucket(struct rock_struct *r, float x, float y, struct shape *shape)
+{
+	for(; r; r=r->next) {
+		if(collide(x - r->x, y - r->y, r->shape, shape)) return 1;
+	}
+	return 0;
+}
+
+int
+hit_rocks(float x, float y, struct shape *shape)
+{
+	int ix, iy;
+	int l, r, t, b;
+	struct rock_struct **bucket;
 
-			dest.w = src.w;
-			dest.h = src.h;
-			dest.x = (int) rock[i].x;
-			dest.y = (int) rock[i].y;
+	ix = x + grid_size; iy = y + grid_size;
+	l = ix / grid_size; r = (ix+shape->w)/grid_size;
+	t = iy / grid_size; b = (iy+shape->h)/grid_size;
+	bucket = &rock_buckets[p][l + t*bw];
 
-			SDL_BlitSurface(rock[i].image,&src,surf_screen,&dest);
+	if(hit_in_bucket(*bucket, x, y, shape)) return true;
+	if(l && hit_in_bucket(*(bucket-1), x, y, shape)) return true;
+	if(r && hit_in_bucket(*(bucket-bw), x, y, shape)) return true;
+	if(l && r && hit_in_bucket(*(bucket-(1+bw)), x, y, shape)) return true;
 
-		}
+	if(r > l) {
+		if(hit_in_bucket(*(bucket+1), x, y, shape)) return true;
+		if(hit_in_bucket(*(bucket+1-bw), x, y, shape)) return true;
 	}
+	if(t > b) {
+		if(hit_in_bucket(*(bucket+bw), x, y, shape)) return true;
+		if(hit_in_bucket(*(bucket+bw-1), x, y, shape)) return true;
+	}
+	if(r > l && t > b && hit_in_bucket(*(bucket+bw+1), x, y, shape)) return true;
+	return false;
 }
 
 int
-hit_rocks(float x, float y, struct shape *shape)
+pixel_hit_in_bucket(struct rock_struct *r, float x, float y)
 {
-	int i;
-
-	for(i=0; i<MAXROCKS; i++) {
-		if(rock[i].active) {
-			if(collide(x-rock[i].x, y-rock[i].y, rock[i].shape, shape)) 
-				return 1;
-		}
+	for(; r; r=r->next) {
+		if(x < r->x || y < r->y) continue;
+		if(pixel_collide(x - r->x, y - r->y, r->shape)) return 1;
 	}
 	return 0;
 }
 
+int
+pixel_hit_rocks(float x, float y)
+{
+	struct rock_struct **b = bucket(x, y, p);
+	if(pixel_hit_in_bucket(*b, x, y)) return 1;
+	if(pixel_hit_in_bucket(*(b-1), x, y)) return 1;
+	if(pixel_hit_in_bucket(*(b-bw), x, y)) return 1;
+	if(pixel_hit_in_bucket(*(b-bw-1), x, y)) return 1;
+	return 0;
+}
+
 void
 blast_rocks(float x, float y, float radius, int onlyslow)
 {
-	int i;
+	int b;
+	struct rock_struct *r;
 	float dx, dy, n;
 
-	for(i = 0; i<MAXROCKS; i++ ) {
-		if(rock[i].x <= 0) continue;
+	if(onlyslow) return;
 
-		// This makes it so your explosion from dying magically doesn't leave
-		// any rocks that aren't moving much on the x axis. If onlyslow is set,
-		// only rocks that are barely moving will be pushed.
-		if(onlyslow && (!rock[i].dead || rock[i].dx < -4 || rock[i].dx > 3)) {
-			continue;
-		}
+	for(b=0; b<n_buckets; b++) {
+		for(r=rock_buckets[p][b]; r; r=r->next) {
+			if(r->x <= 0) continue;
 
-		dx = rock[i].x - x;
-		dy = rock[i].y - y;
+			// This makes it so your explosion from dying magically doesn't leave
+			// any rocks that aren't moving much on the x axis. If onlyslow is set,
+			// only rocks that are barely moving will be pushed.
+			if(onlyslow && (r->dx - screendx < -4 || r->dx - screendx > 3)) continue;
 
-		n = sqrt(dx*dx + dy*dy);
-		if(n < radius) {
-			n *= 20;
-			rock[i].dx += rockrate*(dx+30)/n;
-			rock[i].dy += rockrate*dy/n;
-			rock[i].dead = 1;
+			dx = r->x - x;
+			dy = r->y - y;
+
+			n = sqrt(dx*dx + dy*dy);
+			if(n < radius) {
+				n *= 15;
+				r->dx += 54.0*dx/n;
+				r->dy += 54.0*dy/n;
+			}
 		}
 	}
 }