From e94d544043de04e4009f9a476e9e09dbe0d99f33 Mon Sep 17 00:00:00 2001
From: daniel <danwip@hotmail.com>
Date: Sat, 3 Jan 2026 19:35:33 +0100
Subject: [PATCH] small improvements and test code for manipulating vertices

---
 .../EngineSharp.Core/OpenGLEngine.cs                 |  3 +++
 src/EngineSharp.Core/EngineSharp.Core/Time.cs        | 12 ++++++++++++
 src/EngineSharp/PlanetGenerator.cs                   | 12 ++++++++----
 3 files changed, 23 insertions(+), 4 deletions(-)
 create mode 100644 src/EngineSharp.Core/EngineSharp.Core/Time.cs

diff --git a/src/EngineSharp.Core/EngineSharp.Core/OpenGLEngine.cs b/src/EngineSharp.Core/EngineSharp.Core/OpenGLEngine.cs
index 2ec8a94..b630469 100644
--- a/src/EngineSharp.Core/EngineSharp.Core/OpenGLEngine.cs
+++ b/src/EngineSharp.Core/EngineSharp.Core/OpenGLEngine.cs
@@ -110,6 +110,9 @@ internal class OpenGLEngine : Engine
         {
             _window.Close();
         }
+
+        Time._secondsSinceStart = _window.Time;
+        Time._deltaTime = deltaTime;
         
         TemporaryMovementProcessing((float)deltaTime);
         TemporaryMouseProcessing();
diff --git a/src/EngineSharp.Core/EngineSharp.Core/Time.cs b/src/EngineSharp.Core/EngineSharp.Core/Time.cs
new file mode 100644
index 0000000..e4369a2
--- /dev/null
+++ b/src/EngineSharp.Core/EngineSharp.Core/Time.cs
@@ -0,0 +1,12 @@
+namespace EngineSharp.Core;
+
+public static class Time
+{
+    internal static double _deltaTime;
+    internal static double _secondsSinceStart;
+
+    public static double DeltaTime => _deltaTime;
+    public static float DeltaTimeF => (float)_deltaTime;
+    public static double SecondsSinceStart => _secondsSinceStart;
+    public static float SecondsSinceStartF => (float)_secondsSinceStart;
+}
\ No newline at end of file
diff --git a/src/EngineSharp/PlanetGenerator.cs b/src/EngineSharp/PlanetGenerator.cs
index cefb998..00400d6 100644
--- a/src/EngineSharp/PlanetGenerator.cs
+++ b/src/EngineSharp/PlanetGenerator.cs
@@ -1,9 +1,12 @@
+using EngineSharp.Core;
 using EngineSharp.Core.Rendering;
+using Silk.NET.Maths;
 
 namespace EngineSharp;
 
 public class PlanetGenerator : Core.ECS.LogicComponent
 {
+    private MeshRenderer _planetMesh = null!;
     public override void Initialise()
     {
         var shader = Shader.GetShader("./assets/shaders/sphere.vert");
@@ -17,17 +20,18 @@ public class PlanetGenerator : Core.ECS.LogicComponent
             Material = material, 
         };
         
-        // TODO: MeshRenderer should probably not have the mesh as a required property.
-        var planetMesh = new MeshRenderer
+        _planetMesh = new MeshRenderer
         {
             Mesh = sphereGenerator.CreateSphere(),
         };
         
-        Entity.AddComponent(planetMesh);    
+        Entity.AddComponent(_planetMesh);    
     }
 
     public override void OnUpdate(double deltaTime)
     {
-        // Nothing to do at the moment
+        // TODO: Now that vertices can be manipulated, I now need to implement the infrastructure to support compute shaders for planet generation 
+        var time = (float)Time.SecondsSinceStart;
+        _planetMesh.Mesh.Vertices[0] = new Vector3D<float>(MathF.Sin(time), MathF.Cos(time), MathF.Sin(time));
     }
 }
\ No newline at end of file