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The following patch tries to guess the display DPI from the ios version string. Not a nice solution but maybe better than nothing.

The "ddpi" value is filled with the scale factor. This is in some way necessary to be returned separately to the user, because a high DPI display might or might not have been requested. The DPI value needs to be adjusted appropriately then.


--- SDL_snapshot/src/video/uikit/SDL_uikitmodes.h	2016-10-02 09:27:31.000000000 +0200
+++ SDL_patches/src/video/uikit/SDL_uikitmodes.h	2016-10-02 12:22:23.998787293 +0200
@@ -44,6 +44,7 @@
 extern int UIKit_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
 extern void UIKit_QuitModes(_THIS);
 extern int UIKit_GetDisplayUsableBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect);
+extern int UIKit_GetDisplayDPI(_THIS, SDL_VideoDisplay * display, float * ddpi, float * hdpi, float * vdpi);
 
 #endif /* _SDL_uikitmodes_h */
 
diff -aur SDL_snapshot/src/video/uikit/SDL_uikitmodes.m SDL_patches/src/video/uikit/SDL_uikitmodes.m
--- SDL_snapshot/src/video/uikit/SDL_uikitmodes.m	2016-10-02 09:27:31.000000000 +0200
+++ SDL_patches/src/video/uikit/SDL_uikitmodes.m	2016-10-02 12:24:58.951840088 +0200
@@ -25,6 +25,8 @@
 #include "SDL_assert.h"
 #include "SDL_uikitmodes.h"
 
+#include <sys/utsname.h>
+
 @implementation SDL_DisplayData
 
 @synthesize uiscreen;
@@ -308,6 +310,92 @@
     }
 }
 
+NSString *machineName()
+{
+    struct utsname systemInfo;
+    if (uname(&systemInfo) < 0) {
+        return nil;
+    } else {
+        return [NSString stringWithCString:systemInfo.machine
+                              encoding:NSUTF8StringEncoding];
+    }
+}
+
+// detects iPad mini by machine id
+BOOL isIpadMini()
+{
+
+    NSString *machName = machineName();
+    if (machName == nil) return NO;
+
+    BOOL isMini = NO;
+    if (    [machName isEqualToString:@"iPad2,5"]
+         || [machName isEqualToString:@"iPad2,6"]
+         || [machName isEqualToString:@"iPad2,7"]
+         || [machName isEqualToString:@"iPad4,4"]
+         || [machName isEqualToString:@"iPad4,5"]
+         || [machName isEqualToString:@"iPad4,6"]
+         || [machName isEqualToString:@"iPad4,7"]
+         || [machName isEqualToString:@"iPad4,8"]
+         || [machName isEqualToString:@"iPad4,9"]
+         || [machName isEqualToString:@"iPad5,1"]
+         || [machName isEqualToString:@"iPad5,2"])
+    {
+        isMini = YES;
+    }
+    return isMini;
+}
+
+// detects iPhone 6 plus and iPhone 6s plus
+BOOL isIPhone6Plus()
+{
+
+    NSString *machName = machineName();
+    if (machName == nil) return NO;
+
+    BOOL isIPhone6Plus = NO;
+    if (    [machName isEqualToString:@"iPhone7,1"]
+         || [machName isEqualToString:@"iPhone8,2"])
+    {
+        isIPhone6Plus = YES;
+    }
+    return isIPhone6Plus;
+}
+
+int 
+UIKit_GetDisplayDPI(_THIS, SDL_VideoDisplay * display, float * ddpi, float * hdpi, float * vdpi)
+{
+	float scale = 1;
+	if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
+		scale = [[UIScreen mainScreen] scale];
+	}
+	
+	float dpi;
+	if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
+		dpi = 132;
+	} else if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
+		dpi = 163;
+	} else {
+		dpi = 160;
+	}
+	
+	if (isIpadMini() == YES)
+	{
+		dpi = 163;
+	}
+	
+	if (isIPhone6Plus() == YES)
+	{
+		dpi = 133;
+	}
+	
+	*ddpi = scale;
+	*hdpi = dpi;
+	*vdpi = dpi;
+	
+	return 0;
+}
+
 #endif /* SDL_VIDEO_DRIVER_UIKIT */
 
 /* vi: set ts=4 sw=4 expandtab: */
diff -aur SDL_snapshot/src/video/uikit/SDL_uikitvideo.m SDL_patches/src/video/uikit/SDL_uikitvideo.m
--- SDL_snapshot/src/video/uikit/SDL_uikitvideo.m	2016-10-02 09:27:31.000000000 +0200
+++ SDL_patches/src/video/uikit/SDL_uikitvideo.m	2016-10-02 12:29:07.357533425 +0200
@@ -87,6 +87,7 @@
         device->VideoInit = UIKit_VideoInit;
         device->VideoQuit = UIKit_VideoQuit;
         device->GetDisplayModes = UIKit_GetDisplayModes;
+        device->GetDisplayDPI = UIKit_GetDisplayDPI;
         device->SetDisplayMode = UIKit_SetDisplayMode;
         device->PumpEvents = UIKit_PumpEvents;
         device->SuspendScreenSaver = UIKit_SuspendScreenSaver;