sokol_app.h win32: draw during window sizing and moving

floooh · Oct 2, 2020 · d5e6190 · d5e6190
1 parent af9ba80
commit d5e6190
Show file tree

Hide file tree

Showing 2 changed files with 34 additions and 2 deletions.
diff --git a/README.md b/README.md
@@ -6,7 +6,7 @@ Simple
 [STB-style](https://github.com/nothings/stb/blob/master/docs/stb_howto.txt)
 cross-platform libraries for C and C++, written in C.
 
-[See what's new](#updates) (**30-Sep-2020** UWP support for sokol_audio.h)
+[See what's new](#updates) (**02-Oct-2020** sokol_app.h win32: draw during resizing and moving the window)
 
 [Live Samples](https://floooh.github.io/sokol-html5/index.html) via WASM.
 
@@ -432,6 +432,14 @@ Emulators](https://floooh.github.io/tiny8bit/) for more interesting usage exampl
 
 # Updates
 
+- **02-Oct-2020**:
+    The sokol_app.h Win32 backend can now render while moving and resizing
+    the window. NOTE that resizing the swapchain buffers (and receiving
+    SAPP_EVENTTYPE_RESIZED events) is deferred until the resizing finished.
+    Resizing the swapchain buffers each frame created a substantial temporary
+    memory spike of up to several hundred MBytes. I need to figure out a better
+    swapchain resizing strategy.
+
 - **30-Sep-2020**:
     sokol_audio.h now works on UWP, thanks again to Alberto Fustinoni
     (@albertofustinoni) for the PR!

diff --git a/sokol_app.h b/sokol_app.h
@@ -5273,7 +5273,6 @@ _SOKOL_PRIVATE void _sapp_win32_char_event(uint32_t c, bool repeat) {
 }
 
 _SOKOL_PRIVATE LRESULT CALLBACK _sapp_win32_wndproc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
-    /* FIXME: refresh rendering during resize with a WM_TIMER event */
     if (!_sapp.win32.in_create_window) {
         switch (uMsg) {
             case WM_CLOSE:
@@ -5438,6 +5437,31 @@ _SOKOL_PRIVATE LRESULT CALLBACK _sapp_win32_wndproc(HWND hWnd, UINT uMsg, WPARAM
             case WM_SYSKEYUP:
                 _sapp_win32_key_event(SAPP_EVENTTYPE_KEY_UP, (int)(HIWORD(lParam)&0x1FF), false);
                 break;
+            case WM_ENTERSIZEMOVE:
+                SetTimer(_sapp.win32.hwnd, 1, USER_TIMER_MINIMUM, NULL);
+                break;
+            case WM_EXITSIZEMOVE:
+                KillTimer(_sapp.win32.hwnd, 1);
+                break;
+            case WM_TIMER:
+                _sapp_frame();
+                #if defined(SOKOL_D3D11)
+                    _sapp_dxgi_Present(_sapp.d3d11.swap_chain, _sapp.swap_interval, 0);
+                #endif
+                #if defined(SOKOL_GLCORE33)
+                    _sapp_wgl_swap_buffers();
+                #endif
+                /* NOTE: resizing the swap-chain during resize leads to a substantial
+                   memory spike (hundreds of megabytes for a few seconds). 
+
+                if (_sapp_win32_update_dimensions()) {
+                    #if defined(SOKOL_D3D11)
+                    _sapp_d3d11_resize_default_render_target();
+                    #endif
+                    _sapp_win32_uwp_app_event(SAPP_EVENTTYPE_RESIZED);
+                }
+                */
+                break;
             default:
                 break;
         }