* float.h (fwrap, fclip): new file.

[vor.git] / dust.c

diff --git a/dust.c b/dust.c
index 96a5805..4eeeb8b 100644 (file)
--- 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 {
@@ -13,9 +14,6 @@ struct dust_mote {
 
 struct dust_mote motes[N_DUST_MOTES];
 
-// lower bound to ensure that we don't lose precision when wrapping.
-static float zero;
-
 void
 init_dust(void)
 {
@@ -27,8 +25,6 @@ init_dust(void)
                b = (MAX_DUST_DEPTH - motes[i].z) * 255.0 / MAX_DUST_DEPTH;
                motes[i].color = SDL_MapRGB(surf_screen->format, b, b, b);
        }
-
-       zero = pow(-10, ceil(log10(XSIZE)) - FLT_DIG);
 }
 
 void
@@ -40,12 +36,10 @@ move_dust(float ticks)
        
        for(i=0; i<N_DUST_MOTES; i++) {
                motes[i].x -= xscroll / (1.3 + motes[i].z);
-               if(motes[i].x >= XSIZE) motes[i].x -= XSIZE;
-               else if(motes[i].x < zero) motes[i].x += XSIZE;
+               motes[i].x = fwrap(motes[i].x, XSIZE);
 
                motes[i].y -= yscroll / (1.3 + motes[i].z);
-               if(motes[i].y >= YSIZE) motes[i].y -= YSIZE;
-               else if(motes[i].y < zero) motes[i].y += YSIZE;
+               motes[i].y = fwrap(motes[i].y, YSIZE);
        }
 }