From 5b8b5c95589e615afda3f0d67db612b64297c2a0 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Sun, 23 Dec 2018 01:06:46 +0800
Subject: *shader and time

---
 src/libjin/time/je_timer.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'src/libjin/time/je_timer.h')

diff --git a/src/libjin/time/je_timer.h b/src/libjin/time/je_timer.h
index 1209827..95c1925 100644
--- a/src/libjin/time/je_timer.h
+++ b/src/libjin/time/je_timer.h
@@ -131,6 +131,25 @@ namespace JinEngine
         #endif
         }
 
+        ///
+        /// Delta time between frames.
+        ///
+        extern float deltaTime;
+
+        inline void step()
+        {
+            static float previous = 0;
+            static float current = getSecond();
+            previous = current;
+            current = getSecond();
+            deltaTime = current - previous;
+        }
+
+        inline float getDeltaTime()
+        {
+            return deltaTime;
+        }
+
     } // namespace Time
 } // namespace JinEngine
 
-- 
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