Examples: DX9, DX10, DX11: Queue framebuffer resize instead of processing in WM_SIZE. (#6374)

docs/CHANGELOG.txt

@@ -64,6 +64,8 @@ Other changes:
 - Examples: Added native Win32+OpenGL3 example. We don't recommend using this setup but we
   provide it for completeness. (#3218, #5170, #6086, #2772, #2600, #2359, #2022, #1553) [@learn-more]
 - Examples: Vulkan: Use integrated GPU if nothing else is available. (#6359) [@kimidaisuki22]
+- Examples: DX9, DX10, DX11: Queue framebuffer resize instead of processing in WM_SIZE,
+  as some drivers tends to only cleanup after existing the native resize modal loop. (#6374)
 
 
 -----------------------------------------------------------------------

examples/example_win32_directx10/main.cpp

@@ -12,6 +12,7 @@
 // Data
 static ID3D10Device*            g_pd3dDevice = nullptr;
 static IDXGISwapChain*          g_pSwapChain = nullptr;
+static UINT                     g_ResizeWidth = 0, g_ResizeHeight = 0;
 static ID3D10RenderTargetView*  g_mainRenderTargetView = nullptr;
 
 // Forward declarations of helper functions
@@ -95,6 +96,15 @@ int main(int, char**)
         if (done)
             break;
 
+        // Handle window resize (we don't resize directly in the WM_SIZE handler)
+        if (g_ResizeWidth != 0 && g_ResizeHeight != 0)
+        {
+            CleanupRenderTarget();
+            g_pSwapChain->ResizeBuffers(0, g_ResizeWidth, g_ResizeHeight, DXGI_FORMAT_UNKNOWN, 0);
+            g_ResizeWidth = g_ResizeHeight = 0;
+            CreateRenderTarget();
+        }
+
         // Start the Dear ImGui frame
         ImGui_ImplDX10_NewFrame();
         ImGui_ImplWin32_NewFrame();
@@ -228,12 +238,10 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
     switch (msg)
     {
     case WM_SIZE:
-        if (g_pd3dDevice != nullptr && wParam != SIZE_MINIMIZED)
+        if (wParam == SIZE_MINIMIZED)
-        {
+            return 0;
-            CleanupRenderTarget();
+        g_ResizeWidth = (UINT)LOWORD(lParam); // Queue resize
-            g_pSwapChain->ResizeBuffers(0, (UINT)LOWORD(lParam), (UINT)HIWORD(lParam), DXGI_FORMAT_UNKNOWN, 0);
+        g_ResizeHeight = (UINT)HIWORD(lParam);
-            CreateRenderTarget();
-        }
         return 0;
     case WM_SYSCOMMAND:
         if ((wParam & 0xfff0) == SC_KEYMENU) // Disable ALT application menu

examples/example_win32_directx11/main.cpp

@@ -12,6 +12,7 @@
 static ID3D11Device*            g_pd3dDevice = nullptr;
 static ID3D11DeviceContext*     g_pd3dDeviceContext = nullptr;
 static IDXGISwapChain*          g_pSwapChain = nullptr;
+static UINT                     g_ResizeWidth = 0, g_ResizeHeight = 0;
 static ID3D11RenderTargetView*  g_mainRenderTargetView = nullptr;
 
 // Forward declarations of helper functions
@@ -95,6 +96,15 @@ int main(int, char**)
         if (done)
             break;
 
+        // Handle window resize (we don't resize directly in the WM_SIZE handler)
+        if (g_ResizeWidth != 0 && g_ResizeHeight != 0)
+        {
+            CleanupRenderTarget();
+            g_pSwapChain->ResizeBuffers(0, g_ResizeWidth, g_ResizeHeight, DXGI_FORMAT_UNKNOWN, 0);
+            g_ResizeWidth = g_ResizeHeight = 0;
+            CreateRenderTarget();
+        }
+
         // Start the Dear ImGui frame
         ImGui_ImplDX11_NewFrame();
         ImGui_ImplWin32_NewFrame();
@@ -232,12 +242,10 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
     switch (msg)
     {
     case WM_SIZE:
-        if (g_pd3dDevice != nullptr && wParam != SIZE_MINIMIZED)
+        if (wParam == SIZE_MINIMIZED)
-        {
+            return 0;
-            CleanupRenderTarget();
+        g_ResizeWidth = (UINT)LOWORD(lParam); // Queue resize
-            g_pSwapChain->ResizeBuffers(0, (UINT)LOWORD(lParam), (UINT)HIWORD(lParam), DXGI_FORMAT_UNKNOWN, 0);
+        g_ResizeHeight = (UINT)HIWORD(lParam);
-            CreateRenderTarget();
-        }
         return 0;
     case WM_SYSCOMMAND:
         if ((wParam & 0xfff0) == SC_KEYMENU) // Disable ALT application menu

examples/example_win32_directx9/main.cpp

@@ -11,6 +11,7 @@
 // Data
 static LPDIRECT3D9              g_pD3D = nullptr;
 static LPDIRECT3DDEVICE9        g_pd3dDevice = nullptr;
+static UINT                     g_ResizeWidth = 0, g_ResizeHeight = 0;
 static D3DPRESENT_PARAMETERS    g_d3dpp = {};
 
 // Forward declarations of helper functions
@@ -93,6 +94,14 @@ int main(int, char**)
         if (done)
             break;
 
+        // Handle window resize (we don't resize directly in the WM_SIZE handler)
+        if (g_ResizeWidth != 0 && g_ResizeHeight != 0)
+        {
+            g_d3dpp.BackBufferWidth = g_ResizeWidth;
+            g_d3dpp.BackBufferHeight = g_ResizeHeight;
+            ResetDevice();
+        }
+
         // Start the Dear ImGui frame
         ImGui_ImplDX9_NewFrame();
         ImGui_ImplWin32_NewFrame();
@@ -219,12 +228,10 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
     switch (msg)
     {
     case WM_SIZE:
-        if (g_pd3dDevice != nullptr && wParam != SIZE_MINIMIZED)
+        if (wParam == SIZE_MINIMIZED)
-        {
+            return 0;
-            g_d3dpp.BackBufferWidth = LOWORD(lParam);
+        g_ResizeWidth = (UINT)LOWORD(lParam); // Queue resize
-            g_d3dpp.BackBufferHeight = HIWORD(lParam);
+        g_ResizeHeight = (UINT)HIWORD(lParam);
-            ResetDevice();
-        }
         return 0;
     case WM_SYSCOMMAND:
         if ((wParam & 0xfff0) == SC_KEYMENU) // Disable ALT application menu