X-Git-Url: https://jasonwoof.com/gitweb/?p=vor.git;a=blobdiff_plain;f=dust.c;h=ab583953ae0bd928ded3f40b5e153f6c9c626ea7;hp=7b6286732228e755ee2fae7880cb33def25ec3c8;hb=0b5ebc550b1fe83206580ee5fc6d1f0023e38d96;hpb=88a9e026caed5568363cefb7d49308b875dc5e4a

diff --git a/dust.c b/dust.c
index 7b62867..ab58395 100644
--- a/dust.c
+++ b/dust.c
@@ -4,6 +4,7 @@
 #include "config.h"
 #include "globals.h"
 #include "dust.h"
+#include "float.h"
 #include "mt.h"
 
 struct dust_mote {
@@ -27,48 +28,27 @@ init_dust(void)
 }
 
 void
-move_dust(float ticks)
+move_dust(void)
 {
 	int i;
-	float xscroll = screendx * ticks;
-	float yscroll = screendy * ticks;
-
-	// Originally this code was much simpler, but it would crash sometimes
-	// because the floating point numbers wouldn't always round the same
-	// direction, and we'd ocanially try to draw off the screen.
+	float xscroll = screendx * t_frame;
+	float yscroll = screendy * t_frame;
 	
 	for(i=0; i<N_DUST_MOTES; i++) {
 		motes[i].x -= xscroll / (1.3 + motes[i].z);
-		motes[i].y -= yscroll / (1.3 + motes[i].z);
+		motes[i].x = fwrap(motes[i].x, XSIZE);
 
-		if(motes[i].x < 0) {
-			motes[i].x += XSIZE;
-		}
-		if(motes[i].x > (XSIZE - 0.000001)) {
-			motes[i].x -= XSIZE;
-			if(motes[i].x < 0) {
-				motes[i].x = 0;
-			}
-		}
-
-		if(motes[i].y < 0) {
-			motes[i].y += YSIZE;
-		}
-		if(motes[i].y > (YSIZE - 0.000001)) {
-			motes[i].y -= YSIZE;
-			if(motes[i].y < 0) {
-				motes[i].y = 0;
-			}
-		}
+		motes[i].y -= yscroll / (1.3 + motes[i].z);
+		motes[i].y = fwrap(motes[i].y, YSIZE);
 	}
 }
 
 void
-draw_dust(SDL_Surface *s)
+draw_dust(void)
 {
 	int i;
-	uint16_t *pixels = s->pixels;
+	uint16_t *pixels = surf_screen->pixels;
 	for(i=0; i<N_DUST_MOTES; i++) {
-		pixels[s->pitch/2*(int)motes[i].y + (int)motes[i].x] = motes[i].color;
+		pixels[surf_screen->pitch/2*(int)motes[i].y + (int)motes[i].x] = motes[i].color;
 	}
 }