WinRT: lots of display and windowing related fixes

This change-set fixes a lot of windowing related bugs, especially with
regards to Windows 8.x apps running on Windows 10 (which was the driver for
this work).  The primary fixes include:
* listed display modes were wrong, especially when launching apps into a
  non-fullscreen space
* reported window flags were often wrong, especially on Windows 10
* fullscreen/windowed mode switches weren't failing (they are not
  programmatically possible in Win 8.x apps).

include/SDL_config_winrt.h

@@ -19,11 +19,23 @@
   3. This notice may not be removed or altered from any source distribution.
 */
 
-#ifndef _SDL_config_windows_h
-#define _SDL_config_windows_h
+#ifndef _SDL_config_winrt_h
+#define _SDL_config_winrt_h
 
 #include "SDL_platform.h"
 
+/* Make sure the Windows SDK's NTDDI_VERSION macro gets defined.  This is used
+   by SDL to determine which version of the Windows SDK is being used.
+*/
+#include <sdkddkver.h>
+
+/* Define possibly-undefined NTDDI values (used when compiling SDL against
+   older versions of the Windows SDK.
+*/
+#ifndef NTDDI_WINBLUE
+#define NTDDI_WINBLUE 0x06030000
+#endif
+
 /* This is a set of defines to configure the SDL features */
 
 #if !defined(_STDINT_H_) && (!defined(HAVE_STDINT_H) || !_HAVE_STDINT_H)
@@ -191,4 +203,4 @@ typedef unsigned int uintptr_t;
 #define SDL_ASSEMBLY_ROUTINES	1
 #endif
 
-#endif /* _SDL_config_windows_h */
+#endif /* _SDL_config_winrt_h */

src/core/winrt/SDL_winrtapp_direct3d.h

@@ -56,16 +56,19 @@ ref class SDL_WinRTApp sealed : public Windows::ApplicationModel::Core::IFramewo
 #endif
     void OnWindowSizeChanged(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::WindowSizeChangedEventArgs^ args);
     void OnLogicalDpiChanged(Platform::Object^ sender);
-    void OnActivated(Windows::ApplicationModel::Core::CoreApplicationView^ applicationView, Windows::ApplicationModel::Activation::IActivatedEventArgs^ args);
+    void OnAppActivated(Windows::ApplicationModel::Core::CoreApplicationView^ applicationView, Windows::ApplicationModel::Activation::IActivatedEventArgs^ args);
     void OnSuspending(Platform::Object^ sender, Windows::ApplicationModel::SuspendingEventArgs^ args);
     void OnResuming(Platform::Object^ sender, Platform::Object^ args);
     void OnExiting(Platform::Object^ sender, Platform::Object^ args);
+    void OnWindowActivated(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::WindowActivatedEventArgs^ args);
     void OnWindowClosed(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::CoreWindowEventArgs^ args);
     void OnVisibilityChanged(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::VisibilityChangedEventArgs^ args);
     void OnPointerPressed(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args);
     void OnPointerReleased(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args);
     void OnPointerWheelChanged(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args);
     void OnPointerMoved(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args);
+    void OnPointerEntered(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args);
+    void OnPointerExited(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args);
     void OnMouseMoved(Windows::Devices::Input::MouseDevice^ mouseDevice, Windows::Devices::Input::MouseEventArgs^ args);
     void OnKeyDown(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::KeyEventArgs^ args);
     void OnKeyUp(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::KeyEventArgs^ args);

src/render/direct3d11/SDL_render_d3d11.c

@@ -760,8 +760,8 @@ SDL_RenderDriver D3D11_RenderDriver = {
 };
 
 
-static Uint32
-DXGIFormatToSDLPixelFormat(DXGI_FORMAT dxgiFormat) {
+Uint32
+D3D11_DXGIFormatToSDLPixelFormat(DXGI_FORMAT dxgiFormat) {
     switch (dxgiFormat) {
         case DXGI_FORMAT_B8G8R8A8_UNORM:
             return SDL_PIXELFORMAT_ARGB8888;
@@ -2911,7 +2911,7 @@ D3D11_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
      */
     if (SDL_ConvertPixels(
         rect->w, rect->h,
-        DXGIFormatToSDLPixelFormat(stagingTextureDesc.Format),
+        D3D11_DXGIFormatToSDLPixelFormat(stagingTextureDesc.Format),
         textureMemory.pData,
         textureMemory.RowPitch,
         format,

src/video/SDL_video.c

@@ -1125,6 +1125,10 @@ SDL_RestoreMousePosition(SDL_Window *window)
     }
 }
 
+#if __WINRT__
+extern Uint32 WINRT_DetectWindowFlags(SDL_Window * window);
+#endif
+
 static int
 SDL_UpdateFullscreenMode(SDL_Window * window, SDL_bool fullscreen)
 {
@@ -1164,6 +1168,30 @@ SDL_UpdateFullscreenMode(SDL_Window * window, SDL_bool fullscreen)
         window->last_fullscreen_flags = window->flags;
         return 0;
     }
+#elif __WINRT__
+    /* HACK: WinRT 8.x apps can't choose whether or not they are fullscreen
+       or not.  The user can choose this, via OS-provided UI, but this can't
+       be set programmatically.
+
+       Just look at what SDL's WinRT video backend code detected with regards
+       to fullscreen (being active, or not), and figure out a return/error code
+       from that.
+    */
+    if (fullscreen == !(WINRT_DetectWindowFlags(window) & FULLSCREEN_MASK)) {
+        /* Uh oh, either:
+            1. fullscreen was requested, and we're already windowed
+            2. windowed-mode was requested, and we're already fullscreen
+
+            WinRT 8.x can't resolve either programmatically, so we're
+            giving up.
+        */
+        return -1;
+    } else {
+        /* Whatever was requested, fullscreen or windowed mode, is already
+            in-place.
+        */
+        return 0;
+    }
 #endif
 
     display = SDL_GetDisplayForWindow(window);
@@ -1377,6 +1405,18 @@ SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
         return NULL;
     }
 
+#if __WINRT__
+    /* HACK: WinRT 8.x apps can't choose whether or not they are fullscreen
+       or not.  The user can choose this, via OS-provided UI, but this can't
+       be set programmatically.
+
+       Just look at what SDL's WinRT video backend code detected with regards
+       to fullscreen (being active, or not), and figure out a return/error code
+       from that.
+    */
+    flags = window->flags;
+#endif
+
     if (title) {
         SDL_SetWindowTitle(window, title);
     }

src/video/winrt/SDL_winrtevents_c.h

@@ -57,6 +57,8 @@ extern Uint8 WINRT_GetSDLButtonForPointerPoint(Windows::UI::Input::PointerPoint
 extern void WINRT_ProcessPointerPressedEvent(SDL_Window *window, Windows::UI::Input::PointerPoint ^pointerPoint);
 extern void WINRT_ProcessPointerMovedEvent(SDL_Window *window, Windows::UI::Input::PointerPoint ^pointerPoint);
 extern void WINRT_ProcessPointerReleasedEvent(SDL_Window *window, Windows::UI::Input::PointerPoint ^pointerPoint);
+extern void WINRT_ProcessPointerEnteredEvent(SDL_Window *window, Windows::UI::Input::PointerPoint ^pointerPoint);
+extern void WINRT_ProcessPointerExitedEvent(SDL_Window *window, Windows::UI::Input::PointerPoint ^pointerPoint);
 extern void WINRT_ProcessPointerWheelChangedEvent(SDL_Window *window, Windows::UI::Input::PointerPoint ^pointerPoint);
 extern void WINRT_ProcessMouseMovedEvent(SDL_Window * window, Windows::Devices::Input::MouseEventArgs ^args);
 

src/video/winrt/SDL_winrtpointerinput.cpp

@@ -306,6 +306,28 @@ void WINRT_ProcessPointerReleasedEvent(SDL_Window *window, Windows::UI::Input::P
     }
 }
 
+void WINRT_ProcessPointerEnteredEvent(SDL_Window *window, Windows::UI::Input::PointerPoint ^pointerPoint)
+{
+    if (!window) {
+        return;
+    }
+
+    if (!WINRT_IsTouchEvent(pointerPoint)) {
+        SDL_SetMouseFocus(window);
+    }
+}
+
+void WINRT_ProcessPointerExitedEvent(SDL_Window *window, Windows::UI::Input::PointerPoint ^pointerPoint)
+{
+    if (!window) {
+        return;
+    }
+
+    if (!WINRT_IsTouchEvent(pointerPoint)) {
+        SDL_SetMouseFocus(NULL);
+    }
+}
+
 void
 WINRT_ProcessPointerWheelChangedEvent(SDL_Window *window, Windows::UI::Input::PointerPoint ^pointerPoint)
 {