Fixed building for simulators or older iOS SDKs

src/render/metal/SDL_render_metal.m

@@ -113,12 +113,12 @@ SDL_RenderDriver METAL_RenderDriver = {
 static int
 IsMetalAvailable(const SDL_SysWMinfo *syswm)
 {
-    if (syswm->subsystem != SDL_SYSWM_COCOA) {  // !!! FIXME: SDL_SYSWM_UIKIT for iOS, too!
-        return SDL_SetError("Metal render target only supports Cocoa video target at the moment.");
+    if (syswm->subsystem != SDL_SYSWM_COCOA && syswm->subsystem != SDL_SYSWM_UIKIT) {
+        return SDL_SetError("Metal render target only supports Cocoa and UIKit video targets at the moment.");
     }
 
     // this checks a weak symbol.
-#if MAC_OS_X_VERSION_MIN_REQUIRED < 101100
+#if defined(__MACOSX__)
     if (MTLCreateSystemDefaultDevice == NULL) {  // probably on 10.10 or lower.
         return SDL_SetError("Metal framework not available on this system");
     }

src/video/uikit/SDL_uikitmetalview.h

@@ -32,6 +32,8 @@
 #import "../SDL_sysvideo.h"
 #import "SDL_uikitwindow.h"
 
+#if SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_RENDER_METAL || SDL_VIDEO_VULKAN)
+
 #import <UIKit/UIKit.h>
 #import <Metal/Metal.h>
 #import <QuartzCore/CAMetalLayer.h>
@@ -50,6 +52,8 @@ SDL_uikitmetalview* UIKit_Mtl_AddMetalView(SDL_Window* window);
 
 void UIKit_Mtl_GetDrawableSize(SDL_Window * window, int * w, int * h);
 
+#endif /* SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_RENDER_METAL || SDL_VIDEO_VULKAN) */
+
 #endif /* SDL_uikitmetalview_h_ */
 
 /* vi: set ts=4 sw=4 expandtab: */

src/video/uikit/SDL_uikitmetalview.m

@@ -28,7 +28,7 @@
 
 #include "../../SDL_internal.h"
 
-#if SDL_VIDEO_VULKAN && SDL_VIDEO_DRIVER_UIKIT
+#if SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_RENDER_METAL || SDL_VIDEO_VULKAN)
 
 #import "../SDL_sysvideo.h"
 #import "SDL_uikitwindow.h"
@@ -133,4 +133,4 @@ UIKit_Mtl_GetDrawableSize(SDL_Window * window, int * w, int * h)
     }
 }
 
-#endif
+#endif /* SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_RENDER_METAL || SDL_VIDEO_VULKAN) */