sokol_app.h: modernize D3D11 swapchain code (#401)

win32+d3d11: use DXGI_SWAP_EFFECT_FLIP_DISCARD if available, uwp+d3d11: add MSAA support

1 files changed, 13 insertions, 1 deletions

diff --git a/README.md b/README.md
index 70d62c5e..204abe3f 100644
--- 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) (**07-Oct-2020** sokol_audio.h: ALSA backend initialization fixes)
+[See what's new](#updates) (**10-Oct-2020** sokol_app.h win32/uwp: D3D11/DXGI swapchain code modernization)
 
 [Live Samples](https://floooh.github.io/sokol-html5/index.html) via WASM.
 
@@ -432,6 +432,18 @@ Emulators](https://floooh.github.io/tiny8bit/) for more interesting usage exampl
 
 # Updates
 
+- **10-Oct-2020**: Improvements to the sokol_app.h Win32+D3D11 and UWP+D3D11 swapchain code:
+  - In the Win32+D3D11 backend and when running on Win10,
+    ```DXGI_SWAP_EFFECT_FLIP_DISCARD``` is now used.  This gets rid of a
+    deprecation warning in the debugger console and also should allow slightly
+    more efficient swaps in some situations. When running on Win7 or Win8, the
+    traditional ```DXGI_SWAP_EFFECT_DISCARD``` is used.
+  - The UWP backend now supports MSAA multisampling (the required fixes for
+    this are the same as in the Win32 backend with the new swap effect: a
+    separate MSAA texture and render-target-view is created where
+    rendering goes into, and this MSAA texture is resolved into the actual
+    swapchain surface before presentation).
+
 - **07-Oct-2020**:
     A fix in the ALSA/Linux backend initialization in sokol_audio.h: Previously,
     initialization would fail if ALSA can't allocate the exact requested