Implement SPSET(3)

SMILEBASIC/builtinfunctions.d

@@ -1474,6 +1474,17 @@ class BuiltinFunction
             return;
         p.sprite.spset(ix, u, v, w, h, cast(SpriteAttr)attr);
     }
+    static void SPSET(PetitComputer p, int defno, out int ix)
+    {
+        if (!p.sprite.isValidDef(defno))
+        {
+            throw new OutOfRange(smilebasicFunctionName, 1);
+        }
+        ix = p.sprite.allocSprite();
+        if (ix == -1)
+            return;
+        p.sprite.spset(ix, defno);
+    }
     static void SPCHR(PetitComputer p, int id, int defno, DefaultValue!(int, false) V, DefaultValue!(int, false) W, DefaultValue!(int, false) H, DefaultValue!(int, false) ATTR)
     {
         if (!p.sprite.isValidSpriteId(id))

SMILEBASIC/sprite.d

@@ -823,6 +823,10 @@ class Sprite
         synchronized (this)
             sprites[id] = SpriteData(id, spdef, 0/*要調査*/);
     }
+    int allocSprite()
+    {
+        return allocSprite(0, petitcom.displaynum ? cast(int)sprites.length - spmax - 1 : spmax - 1);
+    }
     int allocSprite(int lower, int upper)
     {
         for (int i = lower; i <= upper; i++)