From 668e2f5d2e2de68712c5939e28f24de75c6b2d0b Mon Sep 17 00:00:00 2001
From: Andrew Opalach <andrew@akon.city>
Date: Mon, 4 Mar 2019 21:25:33 -0500
Subject: add proper drop timing based on level

---
 cetris.c | 12 +++++++++++-
 cetris.h |  1 +
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/cetris.c b/cetris.c
index 4356e86..969ff5e 100644
--- a/cetris.c
+++ b/cetris.c
@@ -77,6 +77,11 @@ static const piece_matrix default_matrices[7] = {
   }
 };
 
+/* LEVEL DROP SPEED VALUES */
+static const int level_drop_delay[20] = {
+  48, 43, 38, 33, 28, 23, 18, 13, 8, 6, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3 
+};
+
 /* SRS WALL KICK VALUES */
 
 // https://tetris.wiki/SRS
@@ -303,6 +308,8 @@ void init_game(struct cetris_game* g) {
 #endif
 
   g->tick = 0;
+  g->next_drop_tick = level_drop_delay[0];
+
   g->current_index = 0;
 
   clear_move_queue(g);
@@ -376,7 +383,10 @@ void shuffle_queue(struct cetris_game* g) {
 }
 
 void update_game_tick(struct cetris_game* g) {
-  if ((g->tick % CETRIS_HZ) == 0) move_down(g);
+  if (g->tick == g->next_drop_tick) {
+    move_down(g);
+    g->next_drop_tick = g->tick + level_drop_delay[g->level - 1];
+  }
 
   if (g->current.lock_tick && g->current.lock_tick <= g->tick) {
     g->current.pos.y++;
diff --git a/cetris.h b/cetris.h
index cc353de..f18452e 100644
--- a/cetris.h
+++ b/cetris.h
@@ -79,6 +79,7 @@ struct cetris_game {
 
   /* internal game tick */
   int tick;
+  int next_drop_tick;
 
   /* progress trackers */
   int lines;
-- 
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