Add FPS limit

Author: adazem009

src/engine/internal/engine.cpp

@@ -422,8 +422,10 @@ double Engine::fps() const
 
 void Engine::setFps(double fps)
 {
-    m_fps = fps;
-    updateFrameDuration();
+    if (fps > 0) {
+        m_fps = std::min(fps, 250.0);
+        updateFrameDuration();
+    }
 }
 
 bool Engine::turboModeEnabled() const

test/engine/engine_test.cpp

@@ -87,6 +87,21 @@ TEST(EngineTest, Fps)
 
     engine.setFps(60.25);
     ASSERT_EQ(engine.fps(), 60.25);
+
+    engine.setFps(0);
+    ASSERT_EQ(engine.fps(), 60.25);
+
+    engine.setFps(-5);
+    ASSERT_EQ(engine.fps(), 60.25);
+
+    engine.setFps(250);
+    ASSERT_EQ(engine.fps(), 250);
+
+    engine.setFps(30);
+    ASSERT_EQ(engine.fps(), 30);
+
+    engine.setFps(300);
+    ASSERT_EQ(engine.fps(), 250);
 }
 
 TEST(EngineTest, FpsProject)