core: added `GetMouseDelta()` (#1832)

* core: added `GetMouseDelta()`

Thanks to previousPosition added by raysan it is now possible to create the GetMouseDelta() function.

Returns a Vector2 with the difference between the current and previous position of the mouse in a frame.

Useful for creating camera scrolling, among others.

* Added changes noted by raysan

1 files changed, 11 insertions, 0 deletions

diff --git a/src/core.c b/src/core.c
index 887b57b1..149dad04 100644
--- a/src/core.c
+++ b/src/core.c
@@ -3537,6 +3537,17 @@ Vector2 GetMousePosition(void)
     return position;
 }
 
+// Get mouse delta between frames
+Vector2 GetMouseDelta(void)
+{
+    Vector2 delta = {0};
+
+    delta.x = CORE.Input.Mouse.currentPosition.x - CORE.Input.Mouse.previousPosition.x;
+    delta.y = CORE.Input.Mouse.currentPosition.y - CORE.Input.Mouse.previousPosition.y;
+
+    return delta;
+}
+
 // Set mouse position XY
 void SetMousePosition(int x, int y)
 {