diff --git a/backends/source/gfx_directx9.cpp b/backends/source/gfx_directx9.cpp
index 7183e28..3ca0c46 100644
--- a/backends/source/gfx_directx9.cpp
+++ b/backends/source/gfx_directx9.cpp
@@ -261,27 +261,27 @@ void GfxDirectX9::UploadPools() {
   if (!impl->VBO || impl->VertexBufferSize != GetVertexPoolSize()) {
     if (impl->VBO) impl->VBO->Release();
     impl->Device->CreateVertexBuffer(GetVertexPoolSize() * sizeof(Li::Vertex),
-                                     D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, 0,
-                                     D3DPOOL_DEFAULT, &impl->VBO, nullptr);
+                                     D3DUSAGE_WRITEONLY, 0, D3DPOOL_MANAGED,
+                                     &impl->VBO, nullptr);
     impl->VertexBufferSize = GetVertexPoolSize();
   }
 
   if (!impl->IBO || impl->IndexBufferSize != GetIndexPoolSize()) {
     if (impl->IBO) impl->IBO->Release();
-    impl->Device->CreateIndexBuffer(
-        GetIndexPoolSize() * sizeof(u16), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY,
-        D3DFMT_INDEX16, D3DPOOL_DEFAULT, &impl->IBO, nullptr);
+    impl->Device->CreateIndexBuffer(GetIndexPoolSize() * sizeof(u16),
+                                    D3DUSAGE_WRITEONLY, D3DFMT_INDEX16,
+                                    D3DPOOL_MANAGED, &impl->IBO, nullptr);
     impl->IndexBufferSize = GetIndexPoolSize();
   }
 
   void* vptr;
-  impl->VBO->Lock(0, 0, &vptr, D3DLOCK_DISCARD);
+  impl->VBO->Lock(0, 0, &vptr, 0);
   memcpy(vptr, GetVertexBufPtr(0),
          GetVertexPoolSize() * sizeof(PD::Li::Vertex));
   impl->VBO->Unlock();
 
   void* iptr;
-  impl->IBO->Lock(0, 0, &iptr, D3DLOCK_DISCARD);
+  impl->IBO->Lock(0, 0, &iptr, 0);
   memcpy(iptr, GetIndexBufPtr(0), GetIndexPoolSize() * sizeof(u16));
   impl->IBO->Unlock();
 }
diff --git a/tests/gfx/source/os/desktopos.cpp b/tests/gfx/source/os/desktopos.cpp
index 1cc5762..52ad89e 100644
--- a/tests/gfx/source/os/desktopos.cpp
+++ b/tests/gfx/source/os/desktopos.cpp
@@ -18,6 +18,7 @@ struct DesktopOS::Impl {
 #if WIN32
   IDirect3D9* d3d = nullptr;
   IDirect3DDevice9* dx9_device = nullptr;
+  D3DPRESENT_PARAMETERS d3dpp = {};
 #endif
 };
 
@@ -56,17 +57,18 @@ void DesktopOS::Init() {
   if (pDriver == Driver::DirectX9) {
     impl->d3d = Direct3DCreate9(D3D_SDK_VERSION);
     auto hwnd = glfwGetWin32Window(impl->win);
-    D3DPRESENT_PARAMETERS d3dpp = {};
-    d3dpp.Windowed = TRUE;
-    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
-    d3dpp.hDeviceWindow = hwnd;
-    d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
-    d3dpp.EnableAutoDepthStencil = TRUE;
-    d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
+
+    impl->d3dpp = D3DPRESENT_PARAMETERS{};
+    impl->d3dpp.Windowed = TRUE;
+    impl->d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
+    impl->d3dpp.hDeviceWindow = hwnd;
+    impl->d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
+    impl->d3dpp.EnableAutoDepthStencil = TRUE;
+    impl->d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
 
     HRESULT hr = impl->d3d->CreateDevice(
         D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hwnd,
-        D3DCREATE_HARDWARE_VERTEXPROCESSING, &d3dpp, &impl->dx9_device);
+        D3DCREATE_HARDWARE_VERTEXPROCESSING, &impl->d3dpp, &impl->dx9_device);
     if (FAILED(hr)) {
       MessageBoxW(nullptr, L"Failed to create D3D9 device", L"Error", MB_OK);
       std::abort();
@@ -100,7 +102,15 @@ void DesktopOS::ClearViewPort() {
     glViewport(0, 0, pViewPort.x, pViewPort.y);
   } else if (pDriver == Driver::DirectX9) {
 #ifdef _WIN32
-    if (impl->dx9_device) {
+    // Resize the swapchain to match the window size
+    if (impl->dx9_device && pViewPort.x > 0 && pViewPort.y > 0) {
+      if (impl->d3dpp.BackBufferWidth != (UINT)pViewPort.x ||
+          impl->d3dpp.BackBufferHeight != (UINT)pViewPort.y) {
+        impl->d3dpp.BackBufferWidth = pViewPort.x;
+        impl->d3dpp.BackBufferHeight = pViewPort.y;
+        impl->dx9_device->Reset(&impl->d3dpp);
+      }
+
       impl->dx9_device->Clear(0, nullptr, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,
                               D3DCOLOR_XRGB(25, 25, 25), 1.0f, 0);
       impl->dx9_device->BeginScene();
@@ -112,7 +122,8 @@ void DesktopOS::ClearViewPort() {
 void DesktopOS::SwapBuffers() {
   if (pDriver == Driver::DirectX9) {
 #ifdef _WIN32
-    if (impl->dx9_device) {
+    // yes we schould use some safetey checks
+    if (impl->dx9_device && pViewPort.x > 0 && pViewPort.y > 0) {
       impl->dx9_device->EndScene();
       impl->dx9_device->Present(nullptr, nullptr, nullptr, nullptr);
     }