number of rocks on screen now starts at 25, gradually increasing

[vor.git] / rocks.c

diff --git a/rocks.c b/rocks.c
index ca921cf..19918ed 100644 (file)
--- a/rocks.c
+++ b/rocks.c
@@ -24,7 +24,10 @@ struct shape rock_shapes[NROCKS];
 
 // timers for rock generation.
 float rtimers[4];
-int nrocks;
+
+uint32_t nrocks;
+uint32_t nrocks_timer;
+uint32_t nrocks_inc_ticks = 2*60*1000/(F_ROCKS-I_ROCKS);
 
 // constants for rock generation.
 #define KH 32.0  // 32 s for a speed=1 rock to cross the screen horizontally.
@@ -50,7 +53,6 @@ init_rocks(void)
                NULLERROR(surf_rock[i] = SDL_DisplayFormat(temp));
                get_shape(surf_rock[i], &rock_shapes[i]);
        }
-       nrocks = 41;
        return 0;
 }
 
@@ -60,6 +62,8 @@ reset_rocks(void)
        int i;
 
        for(i = 0; i<MAXROCKS; i++) rock[i].active = 0;
+       nrocks = I_ROCKS;
+       nrocks_timer = 0;
 }
 
 enum { LEFT, RIGHT, TOP, BOTTOM };
@@ -108,6 +112,14 @@ new_rocks(void)
        int i,j;
        float ti[4];
 
+       if(nrocks < F_ROCKS) {
+               nrocks_timer += ticks_since_last;
+               if(nrocks_timer >= nrocks_inc_ticks) {
+                       nrocks_timer -= nrocks_inc_ticks;
+                       nrocks++;
+               }
+       }
+
        rock_timer_increments(ti);
 
        for(i=0; i<4; i++) {