From b47836225185c8d2e2ccf3e191230304709d0a57 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Fonseca?= <jrfonseca@tungstengraphics.com>
Date: Fri, 23 Nov 2007 17:22:54 +0000
Subject: gallium: Reusable pipe buffer library.

This is an optional library that winsys drivers can use to simplify memory
management, and help meet the winsys interface requirements.
---
 src/mesa/pipe/pipebuffer/pb_buffer_malloc.c | 132 ++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 src/mesa/pipe/pipebuffer/pb_buffer_malloc.c

(limited to 'src/mesa/pipe/pipebuffer/pb_buffer_malloc.c')

diff --git a/src/mesa/pipe/pipebuffer/pb_buffer_malloc.c b/src/mesa/pipe/pipebuffer/pb_buffer_malloc.c
new file mode 100644
index 0000000000..65ad51e1e7
--- /dev/null
+++ b/src/mesa/pipe/pipebuffer/pb_buffer_malloc.c
@@ -0,0 +1,132 @@
+/**************************************************************************
+ *
+ * Copyright 2007 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
+ * Implementation of malloc-based buffers to store data that can't be processed
+ * by the hardware. 
+ * 
+ * \author José Fonseca <jrfonseca@tungstengraphics.com>
+ */
+
+
+#include <assert.h>
+#include <stdlib.h>
+
+#include "pb_buffer.h"
+
+
+struct malloc_buffer 
+{
+   struct pipe_buffer base;
+   void *data;
+};
+
+
+extern const struct pipe_buffer_vtbl malloc_buffer_vtbl;
+
+static inline struct malloc_buffer *
+malloc_buffer(struct pipe_buffer *buf)
+{
+   assert(buf);
+   assert(buf->vtbl == &malloc_buffer_vtbl);
+   return (struct malloc_buffer *)buf;
+}
+
+
+static void
+malloc_buffer_reference(struct pipe_buffer *buf)
+{
+   /* no-op */
+}
+
+
+static void
+malloc_buffer_release(struct pipe_buffer *buf)
+{
+   free(malloc_buffer(buf)->data);
+   free(buf);
+}
+
+
+static void *
+malloc_buffer_map(struct pipe_buffer *buf, 
+                  unsigned flags)
+{
+   return malloc_buffer(buf)->data;
+}
+
+
+static void
+malloc_buffer_unmap(struct pipe_buffer *buf)
+{
+   /* No-op */
+}
+
+
+static void
+malloc_buffer_get_base_buffer(struct pipe_buffer *buf,
+                              struct pipe_buffer **base_buf,
+                              unsigned *offset)
+{
+   *base_buf = buf;
+   *offset = 0;
+}
+
+
+const struct pipe_buffer_vtbl 
+malloc_buffer_vtbl = {
+      malloc_buffer_reference,
+      malloc_buffer_release,
+      malloc_buffer_map,
+      malloc_buffer_unmap,
+      malloc_buffer_get_base_buffer
+};
+
+
+struct pipe_buffer *
+malloc_buffer_create(unsigned size) 
+{
+   struct malloc_buffer *buf;
+   
+   /* TODO: accept an alignment parameter */
+   /* TODO: do a single allocation */
+   
+   buf = (struct malloc_buffer *)malloc(sizeof(struct malloc_buffer));
+   if(!buf)
+      return NULL;
+   
+   buf->base.vtbl = &malloc_buffer_vtbl;
+   
+   buf->data = malloc(size);
+   if(!buf->data) {
+      free(buf);
+      return NULL;
+   }
+
+   return &buf->base;
+}
-- 
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