Windows GDK Support (#5830)

* Added GDK

* Simplfied checks in SDL_config_wingdk.h

* Added testgdk sample

* Added GDK readme

* Fixed error in merge of SDL_windows.h

* Additional GDK fixes

* OpenWatcom should not export _SDL_GDKGetTaskQueue

* Formatting fixes

* Moved initialization code into SDL_GDKRunApp

src/render/direct3d/SDL_render_d3d.c

@@ -1775,7 +1775,7 @@ SDL_RenderDriver D3D_RenderDriver = {
 };
 #endif /* SDL_VIDEO_RENDER_D3D && !SDL_RENDER_DISABLED */
 
-#ifdef __WIN32__
+#if defined(__WIN32__) || defined(__WINGDK__)
 /* This function needs to always exist on Windows, for the Dynamic API. */
 IDirect3DDevice9 *
 SDL_RenderGetD3D9Device(SDL_Renderer * renderer)
@@ -1799,6 +1799,6 @@ SDL_RenderGetD3D9Device(SDL_Renderer * renderer)
 
     return device;
 }
-#endif /* __WIN32__ */
+#endif /* defined(__WIN32__) || defined(__WINGDK__) */
 
 /* vi: set ts=4 sw=4 expandtab: */

src/render/direct3d11/SDL_render_d3d11.c

@@ -672,7 +672,7 @@ done:
     return result;
 }
 
-#ifdef __WIN32__
+#if defined(__WIN32__) || defined(__WINGDK__)
 
 static DXGI_MODE_ROTATION
 D3D11_GetCurrentRotation()
@@ -681,7 +681,7 @@ D3D11_GetCurrentRotation()
     return DXGI_MODE_ROTATION_IDENTITY;
 }
 
-#endif /* __WIN32__ */
+#endif /* defined(__WIN32__) || defined(__WINGDK__) */
 
 static BOOL
 D3D11_IsDisplayRotated90Degrees(DXGI_MODE_ROTATION rotation)
@@ -827,7 +827,7 @@ D3D11_CreateSwapChain(SDL_Renderer * renderer, int w, int h)
         goto done;
 #endif
     } else {
-#ifdef __WIN32__
+#if defined(__WIN32__) || defined(__WINGDK__)
         SDL_SysWMinfo windowinfo;
         SDL_VERSION(&windowinfo.version);
         SDL_GetWindowWMInfo(renderer->window, &windowinfo);
@@ -849,7 +849,7 @@ D3D11_CreateSwapChain(SDL_Renderer * renderer, int w, int h)
 #else
         SDL_SetError(__FUNCTION__", Unable to find something to attach a swap chain to");
         goto done;
-#endif  /* ifdef __WIN32__ / else */
+#endif  /* defined(__WIN32__) || defined(__WINGDK__) / else */
     }
     data->swapEffect = swapChainDesc.SwapEffect;
 
@@ -2473,7 +2473,7 @@ SDL_RenderDriver D3D11_RenderDriver = {
 
 #endif /* SDL_VIDEO_RENDER_D3D11 && !SDL_RENDER_DISABLED */
 
-#ifdef __WIN32__
+#if defined(__WIN32__) || defined(__WINGDK__)
 /* This function needs to always exist on Windows, for the Dynamic API. */
 ID3D11Device *
 SDL_RenderGetD3D11Device(SDL_Renderer * renderer)
@@ -2497,6 +2497,6 @@ SDL_RenderGetD3D11Device(SDL_Renderer * renderer)
 
     return device;
 }
-#endif /* __WIN32__ */
+#endif /* defined(__WIN32__) || defined(__WINGDK__) */
 
 /* vi: set ts=4 sw=4 expandtab: */

src/render/direct3d12/SDL_render_d3d12.c

@@ -3042,7 +3042,7 @@ SDL_RenderDriver D3D12_RenderDriver = {
 
 #endif /* SDL_VIDEO_RENDER_D3D12 && !SDL_RENDER_DISABLED */
 
-#ifdef __WIN32__
+#if defined(__WIN32__) || defined(__GDK__)
 #ifdef __cplusplus
 extern "C"
 #endif
@@ -3069,6 +3069,6 @@ SDL_RenderGetD3D12Device(SDL_Renderer * renderer)
 
     return device;
 }
-#endif /* __WIN32__ */
+#endif /* defined(__WIN32__) || defined(__GDK__) */
 
 /* vi: set ts=4 sw=4 expandtab: */

src/render/opengl/SDL_render_gl.c

@@ -1715,7 +1715,7 @@ GL_IsProbablyAccelerated(const GL_RenderData *data)
     /*const char *vendor = (const char *) data->glGetString(GL_VENDOR);*/
     const char *renderer = (const char *) data->glGetString(GL_RENDERER);
 
-#ifdef __WINDOWS__
+#if defined(__WINDOWS__) || defined(__WINGDK__)
     if (SDL_strcmp(renderer, "GDI Generic") == 0) {
         return SDL_FALSE;  /* Microsoft's fallback software renderer. Fix your system! */
     }

src/render/software/SDL_rotate.c

@@ -32,7 +32,7 @@ Andreas Schiffler -- aschiffler at ferzkopp dot net
 
 #if SDL_VIDEO_RENDER_SW && !SDL_RENDER_DISABLED
 
-#if defined(__WIN32__)
+#if defined(__WIN32__) || defined(__GDK__)
 #include "../../core/windows/SDL_windows.h"
 #endif