Added timer

src/CMakeLists.txt

@@ -9,6 +9,7 @@ set(HEADERS
         ${CMAKE_CURRENT_SOURCE_DIR}/shader.h
         ${CMAKE_CURRENT_SOURCE_DIR}/texture.h
         ${CMAKE_CURRENT_SOURCE_DIR}/texture_generator.h
+        ${CMAKE_CURRENT_SOURCE_DIR}/timer.h
         PARENT_SCOPE
         )
 
@@ -21,5 +22,6 @@ set(SOURCE
         ${CMAKE_CURRENT_SOURCE_DIR}/shader.cpp
         ${CMAKE_CURRENT_SOURCE_DIR}/texture.cpp
         ${CMAKE_CURRENT_SOURCE_DIR}/texture_generator.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/timer.cpp
         PARENT_SCOPE
         )

src/timer.cpp

@@ -0,0 +1,23 @@
+#include "timer.h"
+
+BEGIN_NAMESPACE
+
+timer::timer() {
+    start_time = std::chrono::system_clock::now();
+    last_lap_time = start_time;
+}
+
+double timer::seconds_since_start() {
+    std::chrono::time_point<std::chrono::system_clock> now = std::chrono::system_clock::now();
+    std::chrono::duration<double> elapsed_seconds = now - start_time;
+    return elapsed_seconds.count();
+}
+
+double timer::lap() {
+    std::chrono::time_point<std::chrono::system_clock> now = std::chrono::system_clock::now();
+    std::chrono::duration<double> elapsed_seconds = now - last_lap_time;
+    last_lap_time = now;
+    return elapsed_seconds.count();
+}
+
+END_NAMESPACE

src/timer.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include "defines.h"
+#include <chrono>
+
+BEGIN_NAMESPACE
+
+class timer {
+public:
+    timer();
+
+    double seconds_since_start();
+    double lap();
+
+private:
+    std::chrono::time_point<std::chrono::system_clock> start_time;
+    std::chrono::time_point<std::chrono::system_clock> last_lap_time;
+};
+
+END_NAMESPACE