Replace TSO's Smiting with Divine Shield.

Actually, I wasn't entirely sure which of the many attack
invocations to replace and I chose Smiting mostly because
of the new overlap with Zin and because such a change is
easiest to revert (copy code from Zin). :p

Divine Shield strengthens existing shields (also magical,
which might have to be excluded) or else creates a new
magical one. Either way, the shields value is increased by
  3 + skills(SHIELDS)/5
and this bonus lasts for 
  5 + (skills(SHIELS) + 2*skills(INVOCATIONS))/6
turns, after which it is decreased by 1 every two out of
three turns until it reaches 0.


git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3225 c06c8d41-db1a-0410-9941-cceddc491573

1 files changed, 30 insertions, 0 deletions

diff --git a/crawl-ref/source/spells4.cc b/crawl-ref/source/spells4.cc
index 665ebd1901..603c16932b 100644
--- a/crawl-ref/source/spells4.cc
+++ b/crawl-ref/source/spells4.cc
@@ -44,6 +44,7 @@
 #include "ouch.h"
 #include "player.h"
 #include "randart.h"
+#include "religion.h"
 #include "skills.h"
 #include "spells1.h"
 #include "spells4.h"
@@ -2816,6 +2817,35 @@ void cast_condensation_shield(int pow)
     return;
 }                               // end cast_condensation_shield()
 
+// shield bonus = attribute for duration turns, then decreasing by 1
+//                every two out of three turns
+// overall shield duration = duration + attribute
+// recasting simply resets those two values (to better values, presumably)
+void cast_divine_shield()
+{
+    if (!you.duration[DUR_DIVINE_SHIELD])
+    {
+        you.redraw_armour_class = true;
+        if (you.shield() || you.duration[DUR_FIRE_SHIELD]
+            || you.duration[DUR_CONDENSATION_SHIELD])
+        {
+            mprf("Your shield is strengthened by %s's divine power.",
+                 god_name(you.religion).c_str());
+        }
+        else
+            mpr("A divine shield forms around you!");
+    }
+    
+    // duration of complete shield bonus up to 18 turns
+    you.duration[DUR_DIVINE_SHIELD]
+       = 5 + (you.skills[SK_SHIELDS] + you.skills[SK_INVOCATIONS]*2)/6;
+
+    // shield bonus up to 8
+    you.attribute[ATTR_DIVINE_SHIELD] = 3 + you.skills[SK_SHIELDS]/5;
+        
+    return;
+}
+
 static int quadrant_blink(int x, int y, int pow, int garbage)
 {
     UNUSED( garbage );