Added query functions for haptic devices.

libsdl-org · Jun 30, 2008 · 62590a8 · 62590a8
1 parent 37aedc1
commit 62590a8
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Showing 3 changed files with 52 additions and 1 deletion.
diff --git a/include/SDL_haptic.h b/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.
  */

diff --git a/src/haptic/SDL_haptic.c b/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.

diff --git a/src/haptic/linux/SDL_syshaptic.c b/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) {