Calculate skill cost based on experience instead of skill points.

So it's not influenced by cross/anti training and manuals anymore. Early game
cost will raise at the same rate for all backgrounds too. The ones with low
skill levels used to have a low cost for a longer time, allowing them to
catch up more quickly to the others.
Globally, early game cost will raise a bit faster, so this might need to
be balanced a bit (although I'm not sure how).
On the other hand, the new system is cleaner and simpler.
Also, in wizmode, changing skill levels don't have any effect on skill cost
anymore, however, changing XL does.

1 files changed, 1 insertions, 1 deletions

diff --git a/crawl-ref/source/skills2.h b/crawl-ref/source/skills2.h
index 7fcc1b70c6..677bbafb12 100644
--- a/crawl-ref/source/skills2.h
+++ b/crawl-ref/source/skills2.h
@@ -23,7 +23,7 @@ struct skill_state
     FixedVector<unsigned int, NUM_SKILLS> ct_skill_points;
     FixedVector<uint8_t, NUM_SKILLS>      skill_order;
     int skill_cost_level;
-    int total_skill_points;
+    unsigned int total_experience;
     bool auto_training;
     int exp_available;
     int manual_charges;