gallium/util: add a simple allocator for suballocating from a large buffer

Tested-by: Aaron Watry <[email protected]>
Reviewed-by: Alex Deucher <[email protected]>

1 files changed, 48 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/util/u_suballoc.h b/src/gallium/auxiliary/util/u_suballoc.h
new file mode 100644
index 00000000000..1f5550ffae3
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_suballoc.h
@@ -0,0 +1,48 @@
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, Inc.
+ * Copyright 2012 Marek Olšák <[email protected]>
+ * 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 THE AUTHORS 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.
+ *
+ **************************************************************************/
+
+/* A simple allocator that suballocates memory from a large buffer. */
+
+#ifndef U_SUBALLOC
+#define U_SUBALLOC
+
+struct u_suballocator;
+
+struct u_suballocator *
+u_suballocator_create(struct pipe_context *pipe, unsigned size,
+                      unsigned alignment, unsigned bind, unsigned usage,
+		      boolean zero_buffer_memory);
+
+void
+u_suballocator_destroy(struct u_suballocator *allocator);
+
+void
+u_suballocator_alloc(struct u_suballocator *allocator, unsigned size,
+                     unsigned *out_offset, struct pipe_resource **outbuf);
+
+#endif