Add entity system, add new enemy (snake)

1 files changed, 41 insertions, 4 deletions

diff --git a/src/map.c b/src/map.c
index 4c5390f..c62c5c1 100644
--- a/src/map.c
+++ b/src/map.c
@@ -1,18 +1,33 @@
 #include <stdint.h>
+#include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include "vga.h"
 #include "data.h"
 
+#include "entities.h"
 #include "player.h"
+#include "snake.h"
 
 #include "map.h"
 
+typedef enum
+{
+    Player = 0,
+    Snake,
+} EntityType;
+
 /* current map; set via map_init */
 static const uint8_t *cmap;
 static uint8_t gold[MAP_W * MAP_H];
 static uint8_t total_gold;
 
+static void (* const init[])(Entity *) =
+{
+    snake_init,
+};
+
 void map_init(const uint8_t map[])
 {
     cmap = map;
@@ -27,18 +42,40 @@ void map_init(const uint8_t map[])
         if (gold[i] != 0xff)
             total_gold++;
 
+    entities_init();
+
+    Entity *e;
+
     /* spawn entities, 0xff is the list terminator */
     for (
         const uint8_t *ent = map + MAP_W * MAP_H * 2;
         *ent != 0xff;
         ent += 4
     )
-        switch (*ent)
+    {
+        /* the player is not part of the entity system */
+        if (*ent == Player)
         {
-            case Player:
-                player_init(ent[1] * MAP_TILE_W, ent[2] * MAP_TILE_H, ent[3] & 1);
-                break;
+            player_init(ent[1] * MAP_TILE_W, ent[2] * MAP_TILE_H, ent[3] & 1);
+            continue;
         }
+
+        e = entities_new();
+#ifdef DEBUG
+        if (!e)
+        {
+            set_mode(3);
+            fprintf(stderr, "ERROR: run out of entities\n");
+            exit(1);
+        }
+#endif
+
+        e->x = ent[1] * MAP_TILE_W;
+        e->y = ent[2] * MAP_TILE_H;
+        e->dir = ent[3] & 1;
+
+        init[*ent - 1](e);
+    }
 }
 
 void map_render()