Added query functions for haptic devices.

include/SDL_haptic.h

@@ -99,6 +99,19 @@ extern DECLSPEC SDL_Haptic * SDL_HapticOpen(int device_index);
  */
 extern DECLSPEC void SDL_HapticClose(SDL_Haptic * haptic);
 
+/*
+ * Returns the number of effects a haptic device can store.
+ */
+extern DECLSPEC int SDL_HapticNumEffects(SDL_Haptic * haptic);
+
+/*
+ * Returns the supported effects.  Individual effects can be queried by
+ * bitwise operators.
+ *
+ * Example:  (SDL_HapticQueryEffects(haptic) & SDL_HAPTIC_CONSTANT)
+ */
+extern DECLSPEC unsigned int SDL_HapticQueryEffects(SDL_Haptic * haptic);
+
 /*
  * Creates a new haptic effect on the device.
  */

src/haptic/SDL_haptic.c

@@ -197,6 +197,43 @@ SDL_HapticQuit(void)
    }
 }
 
+/*
+ * Returns the number of effects a haptic device has.
+ */
+int
+SDL_HapticNumEffects(SDL_Haptic * haptic)
+{
+   if (!ValidHaptic(&haptic)) {
+      return -1;
+   }
+
+   return haptic->neffects;
+}
+
+/*
+ * Returns supported effects by the device.
+ */
+unsigned int
+SDL_HapticQueryEffects(SDL_Haptic * haptic)
+{
+   if (!ValidHaptic(&haptic)) {
+      return -1;
+   }
+
+   return haptic->supported;
+}
+
+int
+SDL_HapticEffectSupported(SDL_Haptic * haptic, SDL_HapticEffect * effect)
+{
+   if (!ValidHaptic(&haptic)) {
+      return -1;
+   }
+
+   if ((haptic->supported & effect->type) != 0)
+      return SDL_TRUE;
+   return SDL_FALSE;
+}
 
 /*
  * Creates a new haptic effect.

src/haptic/linux/SDL_syshaptic.c

@@ -207,8 +207,9 @@ SDL_SYS_HapticOpen(SDL_Haptic * haptic)
       goto open_err;
    }
    SDL_memset(haptic->hwdata, 0, sizeof(*haptic->hwdata));
-   /* Set the hwdata */
+   /* Set the data */
    haptic->hwdata->fd = fd;
+   haptic->supported = EV_IsHaptic(fd);
 
    /* Set the effects */
    if (ioctl(fd, EVIOCGEFFECTS, &haptic->neffects) < 0) {