vega: implement handler/pointer conversion using a hash table

Before, we were just casting between 32-bit VGHandles and 64-bit pointers.

1 files changed, 99 insertions, 0 deletions

diff --git a/src/gallium/state_trackers/vega/handle.c b/src/gallium/state_trackers/vega/handle.c
new file mode 100644
index 00000000000..5ec4d7121d3
--- /dev/null
+++ b/src/gallium/state_trackers/vega/handle.c
@@ -0,0 +1,99 @@
+/**************************************************************************
+ *
+ * Copyright 2010 VMware, Inc.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
+#include "handle.h"
+#include "util/u_hash.h"
+#include "util/u_hash_table.h"
+
+
+/**
+ * Hash keys are 32-bit VGHandles
+ */
+
+struct util_hash_table *handle_hash = NULL;
+
+
+static unsigned next_handle = 1;
+
+
+static unsigned
+hash_func(void *key)
+{
+   /* XXX this kind of ugly */
+   intptr_t ip = pointer_to_intptr(key);
+   return (unsigned) (ip & 0xffffffff);
+}
+
+
+static int
+compare(void *key1, void *key2)
+{
+   if (key1 < key2)
+      return -1;
+   else if (key1 > key2)
+      return +1;
+   else
+      return 0;
+}
+
+
+void
+init_handles(void)
+{
+   if (!handle_hash)
+      handle_hash = util_hash_table_create(hash_func, compare);
+}
+
+
+void
+free_handles(void)
+{
+   /* XXX destroy */
+}
+
+
+VGHandle
+create_handle(void *object)
+{
+   VGHandle h = next_handle++;
+   util_hash_table_set(handle_hash, intptr_to_pointer(h), object);
+#if DEBUG
+   {
+      void *v = handle_to_object(h);
+      assert(v == object);
+   }
+#endif
+   return h;
+}
+
+
+void
+destroy_handle(VGHandle h)
+{
+   util_hash_table_remove(handle_hash, intptr_to_pointer(h));
+}
+