pipebuffer: Alternative buffer manager.

For situations where one has a reserve memory pool, or
a faster/slower pool.

src/gallium/auxiliary/pipebuffer/pb_bufmgr_alt.c

@@ -0,0 +1,101 @@
+/**************************************************************************
+ *
+ * Copyright 2007-2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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 TUNGSTEN GRAPHICS 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.
+ *
+ **************************************************************************/
+
+/**
+ * \file
+ * Allocate buffers from two alternative buffer providers.
+ * 
+ * \author Jose Fonseca <jrfonseca@tungstengraphics.com>
+ */
+
+
+#include "pipe/p_compiler.h"
+#include "pipe/p_debug.h"
+#include "pipe/p_util.h"
+
+#include "pb_buffer.h"
+#include "pb_bufmgr.h"
+
+
+struct pb_alt_manager
+{
+   struct pb_manager base;
+
+   struct pb_manager *provider1;
+   struct pb_manager *provider2;
+};
+
+
+static INLINE struct pb_alt_manager *
+pb_alt_manager(struct pb_manager *mgr)
+{
+   assert(mgr);
+   return (struct pb_alt_manager *)mgr;
+}
+
+
+static struct pb_buffer *
+pb_alt_manager_create_buffer(struct pb_manager *_mgr, 
+                             size_t size,
+                             const struct pb_desc *desc)
+{
+   struct pb_alt_manager *mgr = pb_alt_manager(_mgr);
+   struct pb_buffer *buf;
+   
+   buf = mgr->provider1->create_buffer(mgr->provider1, size, desc);
+   if(buf)
+      return buf;
+   
+   buf = mgr->provider2->create_buffer(mgr->provider2, size, desc);
+   return buf;
+}
+
+
+static void
+pb_alt_manager_destroy(struct pb_manager *mgr)
+{
+   FREE(mgr);
+}
+
+
+struct pb_manager *
+pb_alt_manager_create(struct pb_manager *provider1, 
+                      struct pb_manager *provider2)
+{
+   struct pb_alt_manager *mgr;
+
+   mgr = CALLOC_STRUCT(pb_alt_manager);
+   if (!mgr)
+      return NULL;
+
+   mgr->base.destroy = pb_alt_manager_destroy;
+   mgr->base.create_buffer = pb_alt_manager_create_buffer;
+   mgr->provider1 = provider1;
+   mgr->provider2 = provider2;
+      
+   return &mgr->base;
+}