moved grid stuff from rocks.c to sprite.c

[vor.git] / sprite.c

diff --git a/sprite.c b/sprite.c
index 760af11..38dae30 100644 (file)
--- a/sprite.c
+++ b/sprite.c
@@ -1,15 +1,31 @@
 #include <stdlib.h>
+#include <string.h>
+#include "config.h"
 #include "common.h"
+#include "globals.h"
 #include "sprite.h"
+#include "rocks.h"
 
-void
-load_sprite(Sprite *s, char *filename)
-{
-       s->image = load_image(filename);
-       if(s->image) get_shape(s);
-}
+SDL_Surface *load_image(char *filename);
+void load_ship(void);
 
-void
+// 2 sets of sprites, sorted by position
+static Sprite **sprites[2] = { NULL, NULL };
+
+// which set are we using?
+static int set = 0;
+
+// size of squares into which sprites are sorted.
+static int grid_size = 0;
+
+// screen size in grid squares.
+static int gw = 0, gh = 0;
+
+// lists of free sprites, by type.
+Sprite *free_sprites[N_TYPES];
+
+
+static void
 get_shape(Sprite *s)
 {
        int x, y;
@@ -22,8 +38,9 @@ get_shape(Sprite *s)
        }
 
        s->w = s->image->w; s->h = s->image->h;
-       s->mask_w = ((s->image->w+31)>>5);
-       s->mask = malloc(4*s->mask_w*s->h);
+       grid_size = max(grid_size, max(s->w, s->h));
+       s->mask_w = ((s->w+31)>>5);
+       s->mask = malloc(s->mask_w*s->h*sizeof(uint32_t));
        if(!s->mask) {
                fprintf(stderr, "get_shape(): can't allocate bitmask.\n");
                exit(1);
@@ -46,6 +63,92 @@ get_shape(Sprite *s)
        SDL_UnlockSurface(s->image);
 }
 
+
+void
+load_sprite(Sprite *s, char *filename)
+{
+       s->image = load_image(filename);
+       if(s->image) get_shape(s);
+}
+
+
+static void
+load_sprites(void)
+{
+       load_ship();
+       load_rocks();
+}
+
+
+void
+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;
+
+       sprites[0] = malloc(2 * gw * gh * sizeof(Sprite *));
+       sprites[1] = (void *)sprites[0] + gw * gh * sizeof(Sprite *);
+       if(!sprites[0]) {
+               fprintf(stderr, "init_sprites(): can't allocate grid squares.\n");
+               exit(1);
+       }
+       memset(sprites[0], 0, 2 * gw * gh * sizeof(Sprite *));
+       set = 0;
+}
+
+static inline Sprite **
+square(int x, int y, int set)
+{
+       int b = (x+grid_size)/grid_size + gw*((y+grid_size)/grid_size);
+       return &sprites[set][b];
+}
+
+void
+add_sprite(Sprite *s)
+{
+       insert_sprite(square(s->x, s->y, set), s);
+}
+
+void
+move_sprite(Sprite *s)
+{
+       // move it.
+       s->x += (s->dx - screendx)*t_frame;
+       s->y += (s->dy - screendy)*t_frame;
+}
+
+void
+sort_sprite(Sprite *s)
+{
+       // clip it, or sort it into the other set of sprites.
+       if(s->x + s->w < 0 || s->x >= XSIZE
+          || s->y + s->h < 0 || s->y >= YSIZE) {
+               insert_sprite(&free_sprites[s->type], s);
+               s->type = NONE;
+       } else insert_sprite(square(s->x, s->y, 1-set), s);
+}
+
+void
+move_sprites(void)
+{
+       int sq;
+       Sprite **head;
+
+       // Move all the sprites (position and set)
+       for(sq=0; sq<gw*gh; sq++) {
+               head=&sprites[set][sq];
+               while(*head) {
+                       Sprite *s = remove_sprite(head);
+                       move_sprite(s); sort_sprite(s);
+               }
+       }
+       set = 1-set;  // switch to other set of sprites.
+}
+
+
 static int
 line_collide(int xov, unsigned bit, uint32_t *amask, uint32_t *bmask)
 {
@@ -108,6 +211,44 @@ collide(Sprite *a, Sprite *b)
 }
 
 int
+hit_in_square(Sprite *r, Sprite *s)
+{
+       for(; r; r=r->next) {
+               if(collide(r, s)) return true;
+       }
+       return false;
+}
+
+int
+collides(Sprite *s)
+{
+       int l, r, t, b;
+       Sprite **sq;
+
+       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(hit_in_square(*sq, s)) return true;
+       if(l > 0 && hit_in_square(*(sq-1), s)) return true;
+       if(t > 0 && hit_in_square(*(sq-gw), s)) return true;
+       if(l > 0 && t > 0 && hit_in_square(*(sq-1-gw), s)) return true;
+
+       if(r > l) {
+               if(hit_in_square(*(sq+1), s)) return true;
+               if(t > 0 && hit_in_square(*(sq+1-gw), s)) return true;
+       }
+       if(b > t) {
+               if(hit_in_square(*(sq+gw), s)) return true;
+               if(l > 0 && hit_in_square(*(sq-1+gw), s)) return true;
+       }
+       if(r > l && b > t && hit_in_square(*(sq+1+gw), s)) return true;
+       return false;
+}
+
+int
 pixel_collide(Sprite *s, int x, int y)
 {
        uint32_t pmask;
@@ -118,3 +259,27 @@ pixel_collide(Sprite *s, int x, int y)
        pmask = 0x80000000 >> (x&0x1f);
        return s->mask[(y*s->mask_w) + (x>>5)] & pmask;
 }
+
+int
+pixel_hit_in_square(Sprite *r, float x, float y)
+{
+       for(; r; r=r->next) {
+               if(pixel_collide(r, x, y)) return 1;
+       }
+       return 0;
+}
+
+int
+pixel_collides(float x, float y)
+{
+       int l, t;
+       Sprite **sq;
+
+       l = (x + grid_size) / grid_size; t = (y + grid_size) / grid_size;
+       sq = &sprites[set][l + t*gw];
+       if(pixel_hit_in_square(*sq, x, y)) return true;
+       if(l > 0 && pixel_hit_in_square(*(sq-1), x, y)) return true;
+       if(t > 0 && pixel_hit_in_square(*(sq-gw), x, y)) return true;
+       if(l > 0 && t > 0 && pixel_hit_in_square(*(sq-1-gw), x, y)) return true;
+       return false;
+}