Smooth scrolling fixes for SDL and love2d

love_smoothmouse.patch

diff -r 37e1ced87caf src/modules/event/sdl/Event.cpp
--- a/src/modules/event/sdl/Event.cpp	Wed Aug 02 02:56:02 2017 +0300
+++ b/src/modules/event/sdl/Event.cpp	Sat Oct 14 17:25:09 2017 +1100
@@ -270,8 +270,8 @@
 		}
 		break;
 	case SDL_MOUSEWHEEL:
-		vargs.emplace_back((double) e.wheel.x);
-		vargs.emplace_back((double) e.wheel.y);
+		vargs.emplace_back((double) e.wheel.preciseX);
+		vargs.emplace_back((double) e.wheel.preciseY);
 		msg = new Message("wheelmoved", vargs);
 		break;
 	case SDL_FINGERDOWN:

sdl_smoothmouse.patch

diff -r 817e632daa35 include/SDL_events.h
--- a/include/SDL_events.h	Fri Oct 13 19:55:07 2017 -0700
+++ b/include/SDL_events.h	Sat Oct 14 17:24:40 2017 +1100
@@ -271,6 +271,7 @@
     Sint32 x;           /**< The amount scrolled horizontally, positive to the right and negative to the left */
     Sint32 y;           /**< The amount scrolled vertically, positive away from the user and negative toward the user */
     Uint32 direction;   /**< Set to one of the SDL_MOUSEWHEEL_* defines. When FLIPPED the values in X and Y will be opposite. Multiply by -1 to change them back */
+    float preciseX, preciseY;
 } SDL_MouseWheelEvent;
 
 /**
diff -r 817e632daa35 src/events/SDL_mouse.c
--- a/src/events/SDL_mouse.c	Fri Oct 13 19:55:07 2017 -0700
+++ b/src/events/SDL_mouse.c	Sat Oct 14 17:24:40 2017 +1100
@@ -550,7 +550,7 @@
         event.type = SDL_MOUSEWHEEL;
         event.wheel.windowID = mouse->focus ? mouse->focus->id : 0;
         event.wheel.which = mouseID;
-#if 0 /* Uncomment this when it goes in for SDL 2.1 */
+#if 1 /* Uncomment this when it goes in for SDL 2.1 */
         event.wheel.preciseX = x;
         event.wheel.preciseY = y;
 #endif
diff -r 817e632daa35 src/video/cocoa/SDL_cocoaevents.m
--- a/src/video/cocoa/SDL_cocoaevents.m	Fri Oct 13 19:55:07 2017 -0700
+++ b/src/video/cocoa/SDL_cocoaevents.m	Sat Oct 14 17:24:40 2017 +1100
@@ -380,7 +380,7 @@
         }
         [NSApp finishLaunching];
         NSDictionary *appDefaults = [[NSDictionary alloc] initWithObjectsAndKeys:
-            [NSNumber numberWithBool:NO], @"AppleMomentumScrollSupported",
+//            [NSNumber numberWithBool:NO], @"AppleMomentumScrollSupported",
             [NSNumber numberWithBool:NO], @"ApplePressAndHoldEnabled",
             [NSNumber numberWithBool:YES], @"ApplePersistenceIgnoreState",
             nil];
diff -r 817e632daa35 src/video/cocoa/SDL_cocoamouse.m
--- a/src/video/cocoa/SDL_cocoamouse.m	Fri Oct 13 19:55:07 2017 -0700
+++ b/src/video/cocoa/SDL_cocoamouse.m	Sat Oct 14 17:24:40 2017 +1100
@@ -422,17 +422,21 @@
 {
     SDL_Mouse *mouse = SDL_GetMouse();
 
-    CGFloat x = -[event deltaX];
-    CGFloat y = [event deltaY];
+    CGFloat x, y;
+    if ([event hasPreciseScrollingDeltas]) {
+        x = [event scrollingDeltaX] / 10;
+        y = [event scrollingDeltaY] / 10;
+    } else {
+        x = [event deltaX];
+        y = [event deltaY];
+    }
     SDL_MouseWheelDirection direction = SDL_MOUSEWHEEL_NORMAL;
 
-    if ([event respondsToSelector:@selector(isDirectionInvertedFromDevice)]) {
-        if ([event isDirectionInvertedFromDevice] == YES) {
-            direction = SDL_MOUSEWHEEL_FLIPPED;
-        }
+    if ([event isDirectionInvertedFromDevice] == YES) {
+        direction = SDL_MOUSEWHEEL_FLIPPED;
     }
 
-    SDL_SendMouseWheel(window, mouse->mouseID, x, y, direction);
+    SDL_SendMouseWheel(window, mouse->mouseID, -x, y, direction);
 }
 
 void