minimum frame time: 100ms, sprites grid includes just off the right/bottom,

[vor.git] / sprite.c

diff --git a/sprite.c b/sprite.c
index 3898123..4e249c3 100644 (file)
--- a/sprite.c
+++ b/sprite.c
@@ -88,8 +88,8 @@ init_sprites(void)
        load_sprites();
 
        grid_size = grid_size * 3 / 2;
-       gw = (XSIZE-1 + 2*grid_size) / grid_size;
-       gh = (YSIZE-1 + 2*grid_size) / grid_size;
+       gw = (XSIZE + 2*grid_size) / grid_size; // -grid-size to XSIZE inclusive (so sprites can be just off either edge)
+       gh = (YSIZE + 2*grid_size) / grid_size;
 
        sprites[0] = malloc(2 * gw * gh * sizeof(Sprite *));
        sprites[1] = (void *)sprites[0] + gw * gh * sizeof(Sprite *);
@@ -105,6 +105,10 @@ static inline Sprite **
 square(int x, int y, int set)
 {
        int b = (x+grid_size)/grid_size + gw*((y+grid_size)/grid_size);
+       if(b >= gw*gh || b < 0) {
+               fprintf(stderr, "square(%i, %i, %i) = %i\n", x, y, set, b);
+               ((int*)0)[0] = 0;
+       }
        return &sprites[set][b];
 }
 
@@ -165,6 +169,8 @@ move_sprites(void)
 }
 
 
+// xov: number of bits of overlap
+// bit: number of bits in from the left edge of amask where bmask is
 static int
 line_collide(int xov, unsigned bit, uint32_t *amask, uint32_t *bmask)
 {
@@ -182,6 +188,8 @@ line_collide(int xov, unsigned bit, uint32_t *amask, uint32_t *bmask)
        return false;
 }
 
+// xov: number of bits/pixels of horizontal overlap
+// yov: number of bits/pixels of vertical overlap
 static int
 mask_collide(int xov, int yov, Sprite *a, Sprite *b)
 {
@@ -250,44 +258,6 @@ collisions(void)
        }
 }
 
-Sprite *
-hit_in_square(Sprite *r, Sprite *s)
-{
-       for(; r; r=r->next)
-               if(collide(r, s)) break;
-       return r;
-}
-
-Sprite *
-collides(Sprite *s)
-{
-       int l, r, t, b;
-       Sprite **sq;
-       Sprite *c;
-
-       l = (s->x + grid_size) / grid_size;
-       r = (s->x + s->w + grid_size) / grid_size;
-       t = (s->y + grid_size) / grid_size;
-       b = (s->y + s->h + grid_size) / grid_size;
-       sq = &sprites[set][l + t*gw];
-
-       if((c = hit_in_square(*sq, s))) return c;
-       if(l > 0 && (c = hit_in_square(*(sq-1), s))) return c;
-       if(t > 0 && (c = hit_in_square(*(sq-gw), s))) return c;
-       if(l > 0 && t > 0 && (c = hit_in_square(*(sq-1-gw), s))) return c;
-
-       if(r > l) {
-               if((c = hit_in_square(*(sq+1), s))) return c;
-               if(t > 0 && hit_in_square(*(sq+1-gw), s)) return c;
-       }
-       if(b > t) {
-               if((c = hit_in_square(*(sq+gw), s))) return c;
-               if(l > 0 && (c = hit_in_square(*(sq-1+gw), s))) return c;
-       }
-       if(r > l && b > t && (c = hit_in_square(*(sq+1+gw), s))) return c;
-       return NULL;
-}
-
 int
 pixel_collide(Sprite *s, int x, int y)
 {