Migrate rendering from oop to dod

Ghost.Graphics/Data/GraphicsResourceManager.cs

@@ -0,0 +1,54 @@
+namespace Ghost.Graphics.Data;
+
+public struct BatchMaterialID : IEquatable<BatchMaterialID>
+{
+    public uint value;
+
+    public static BatchMaterialID Null => new() { value = 0 };
+
+    public override int GetHashCode()
+    {
+        return value.GetHashCode();
+    }
+
+    public readonly override bool Equals(object? obj)
+    {
+        return obj is BatchMaterialID id && Equals(id);
+    }
+
+    public readonly bool Equals(BatchMaterialID other)
+    {
+        return value == other.value;
+    }
+
+    public readonly int CompareTo(BatchMaterialID other)
+    {
+        return value.CompareTo(other.value);
+    }
+
+    public static bool operator ==(BatchMaterialID a, BatchMaterialID b)
+    {
+        return a.Equals(b);
+    }
+
+    public static bool operator !=(BatchMaterialID a, BatchMaterialID b)
+    {
+        return !a.Equals(b);
+    }
+}
+
+internal class GraphicsResourceManager
+{
+    private readonly Dictionary<BatchMaterialID, Material> _materials = new();
+    private readonly Dictionary<BatchMeshID, MeshHandle> _meshes = new();
+
+    public Material GetMaterial(BatchMaterialID id)
+    {
+        return _materials.TryGetValue(id, out var material) ? material : Material.Null;
+    }
+
+    public MeshHandle GetMesh(BatchMeshID id)
+    {
+        return _meshes.TryGetValue(id, out var mesh) ? mesh : MeshHandle.Invalid;
+    }
+}