diff -uNr SDL2-2.0.4.orig/include/SDL_haptic.h SDL2-2.0.4.mod/include/SDL_haptic.h
--- SDL2-2.0.4.orig/include/SDL_haptic.h	2016-01-02 20:56:31.000000000 +0100
+++ SDL2-2.0.4.mod/include/SDL_haptic.h	2016-10-02 19:51:46.501834000 +0200
@@ -323,6 +323,13 @@
  */
 #define SDL_HAPTIC_SPHERICAL  2
 
+/**
+ *  \brief Uses X axis only.
+ *
+ *  \sa SDL_HapticDirection
+ */
+#define SDL_HAPTIC_X_FORCE  3
+
 /* @} *//* Direction encodings */
 
 /* @} *//* Haptic features */
diff -uNr SDL2-2.0.4.orig/src/haptic/windows/SDL_dinputhaptic.c SDL2-2.0.4.mod/src/haptic/windows/SDL_dinputhaptic.c
--- SDL2-2.0.4.orig/src/haptic/windows/SDL_dinputhaptic.c	2016-10-02 19:52:56.492256800 +0200
+++ SDL2-2.0.4.mod/src/haptic/windows/SDL_dinputhaptic.c	2016-10-02 19:51:24.195391900 +0200
@@ -597,6 +597,10 @@
         if (naxes > 2)
             rglDir[2] = dir->dir[2];
         return 0;
+    case SDL_HAPTIC_X_FORCE:
+        effect->dwFlags |= DIEFF_CARTESIAN;
+        rglDir[0] = 0;
+        return 0;
 
     default:
         return SDL_SetError("Haptic: Unknown direction type.");
@@ -645,7 +649,15 @@
     envelope->dwSize = sizeof(DIENVELOPE);      /* Always should be this. */
 
     /* Axes. */
-    dest->cAxes = haptic->naxes;
+    if (src->constant.direction.type == SDL_HAPTIC_X_FORCE) {
+        dest->cAxes = 1;
+        if (haptic->hwdata->axes[0] != DIJOFS_X) {
+            return SDL_SetError("Haptic: Axis X does not support FF effects.");
+        }
+    }
+    else {
+        dest->cAxes = haptic->naxes;
+    }
     if (dest->cAxes > 0) {
         axes = SDL_malloc(sizeof(DWORD) * dest->cAxes);
         if (axes == NULL) {