src/haptic/SDL_haptic.c
branchgsoc2008_force_feedback
changeset 2472 3f73c88c9abb
child 2474 3f80bf1528b4
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/haptic/SDL_haptic.c	Sun Jun 01 11:44:25 2008 +0000
@@ -0,0 +1,127 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 2008 Edgar Simo
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#include "SDL_haptic_c.h"
+#include "SDL_syshaptic.h"
+
+
+static Uint8 SDL_numhaptics = 0;
+SDL_Haptic **SDL_haptics = NULL;
+static SDL_Haptic *default_haptic = NULL;
+
+
+/*
+ * Initializes the Haptic devices.
+ */
+int
+SDL_HapticInit(void)
+{  
+   int arraylen;
+   int status;
+
+   SDL_numhaptics = 0;
+   status = SDL_SYS_HapticInit();
+   if (status >= 0) {
+      arraylen = (status + 1) * sizeof(*SDL_haptics);
+      SDL_haptics = (SDL_Haptic **) SDL_malloc(arraylen);
+      if (SDL_haptics == NULL) {
+         SDL_numhaptics = 0;
+      } else {
+         SDL_memset(SDL_haptics, 0, arraylen);
+         SDL_numhaptics = status;
+      }
+      status = 0;
+   }
+   default_haptic = NULL;
+
+   return status;
+}
+
+
+/*
+ * Returns the number of available devices.
+ */
+int
+SDL_NumHaptics(void)
+{
+   return SDL_numhaptics;
+}
+
+
+/*
+ * Gets the name of a Haptic device by index.
+ */
+const char *
+SDL_HapticName(int device_index)
+{
+   if ((device_index < 0) || (device_index >= SDL_numhaptics)) {
+      SDL_SetError("There are %d haptic devices available", SDL_numhaptics);
+      return NULL;
+   }
+   return SDL_SYS_HapticName(device_index);
+}
+
+
+/*
+ * Opens a Haptic device
+ */
+SDL_Haptic *
+SDL_HapticOpen(int device_index)
+{
+   int i;
+   SDL_Haptic *haptic;
+
+   if ((device_index < 0) || (device_index >= SDL_numhaptics)) {
+      SDL_SetError("There are %d haptic devices available", SDL_numhaptics);
+      return NULL;
+   }
+
+   /* If the haptic is already open, return it */
+   for (i = 0; SDL_haptics[i]; ++i) {             
+      if (device_index == SDL_haptics[i]->index) {
+         haptic = SDL_haptics[i];
+         ++haptic->ref_count;
+         return haptic;
+      }
+   }
+
+   /* Create and initialize the haptic */
+   haptic = (SDL_Haptic *) SDL_malloc((sizeof *haptic));
+   if (haptic != NULL) {
+      SDL_memset(haptic, 0, (sizeof *haptic));
+      haptic->index = device_index;
+      if (SDL_SYS_HapticOpen(haptic) < 0) {
+         SDL_free(haptic);
+         haptic = NULL;
+      } else {
+      }
+   }
+   if (haptic) {
+      /* Add haptic to list */
+      ++haptic->ref_count;
+      for (i = 0; SDL_haptics[i]; ++i)
+         /* Skip to next haptic */ ;
+      SDL_haptics[i] = haptic;
+   }
+   return haptic;
+}