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+/**************************************************************************
+ *
+ * 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
+ * Generic code for buffers.
+ *
+ * Behind a pipe buffle handle there can be DMA buffers, client (or user)
+ * buffers, regular malloced buffers, etc. This file provides an abstract base
+ * buffer handle that allows the driver to cope with all those kinds of buffers
+ * in a more flexible way.
+ *
+ * There is no obligation of a winsys driver to use this library. And a pipe
+ * driver should be completly agnostic about it.
+ *
+ * \author Jos� Fonseca <jrfonseca@tungstengraphics.com>
+ */
+
+#ifndef PB_BUFFER_H_
+#define PB_BUFFER_H_
+
+
+#include "pipe/p_compiler.h"
+#include "pipe/p_debug.h"
+#include "pipe/p_state.h"
+#include "pipe/p_inlines.h"
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+struct pb_vtbl;
+
+/**
+ * Buffer description.
+ *
+ * Used when allocating the buffer.
+ */
+struct pb_desc
+{
+ unsigned alignment;
+ unsigned usage;
+};
+
+
+/**
+ * Base class for all pb_* buffers.
+ */
+struct pb_buffer
+{
+ struct pipe_buffer base;
+
+ /**
+ * Pointer to the virtual function table.
+ *
+ * Avoid accessing this table directly. Use the inline functions below
+ * instead to avoid mistakes.
+ */
+ const struct pb_vtbl *vtbl;
+};
+
+
+/**
+ * Virtual function table for the buffer storage operations.
+ *
+ * Note that creation is not done through this table.
+ */
+struct pb_vtbl
+{
+ void (*destroy)( struct pb_buffer *buf );
+
+ /**
+ * Map the entire data store of a buffer object into the client's address.
+ * flags is bitmask of PIPE_BUFFER_FLAG_READ/WRITE.
+ */
+ void *(*map)( struct pb_buffer *buf,
+ unsigned flags );
+
+ void (*unmap)( struct pb_buffer *buf );
+
+ /**
+ * Get the base buffer and the offset.
+ *
+ * A buffer can be subdivided in smaller buffers. This method should return
+ * the underlaying buffer, and the relative offset.
+ *
+ * Buffers without an underlaying base buffer should return themselves, with
+ * a zero offset.
+ *
+ * Note that this will increase the reference count of the base buffer.
+ */
+ void (*get_base_buffer)( struct pb_buffer *buf,
+ struct pb_buffer **base_buf,
+ unsigned *offset );
+};
+
+
+static INLINE struct pipe_buffer *
+pb_pipe_buffer( struct pb_buffer *pbuf )
+{
+ assert(pbuf);
+ return &pbuf->base;
+}
+
+
+static INLINE struct pb_buffer *
+pb_buffer( struct pipe_buffer *buf )
+{
+ assert(buf);
+ /* Could add a magic cookie check on debug builds.
+ */
+ return (struct pb_buffer *)buf;
+}
+
+
+/* Accessor functions for pb->vtbl:
+ */
+static INLINE void *
+pb_map(struct pb_buffer *buf,
+ unsigned flags)
+{
+ assert(buf);
+ if(!buf)
+ return NULL;
+ return buf->vtbl->map(buf, flags);
+}
+
+
+static INLINE void
+pb_unmap(struct pb_buffer *buf)
+{
+ assert(buf);
+ if(!buf)
+ return;
+ buf->vtbl->unmap(buf);
+}
+
+
+static INLINE void
+pb_get_base_buffer( struct pb_buffer *buf,
+ struct pb_buffer **base_buf,
+ unsigned *offset )
+{
+ assert(buf);
+ if(!buf) {
+ base_buf = NULL;
+ offset = 0;
+ return;
+ }
+ buf->vtbl->get_base_buffer(buf, base_buf, offset);
+}
+
+
+static INLINE void
+pb_destroy(struct pb_buffer *buf)
+{
+ assert(buf);
+ if(!buf)
+ return;
+ buf->vtbl->destroy(buf);
+}
+
+
+/* XXX: thread safety issues!
+ */
+static INLINE void
+pb_reference(struct pb_buffer **dst,
+ struct pb_buffer *src)
+{
+ if (src)
+ src->base.refcount++;
+
+ if (*dst && --(*dst)->base.refcount == 0)
+ pb_destroy( *dst );
+
+ *dst = src;
+}
+
+
+/**
+ * Utility function to check whether the provided alignment is consistent with
+ * the requested or not.
+ */
+static INLINE boolean
+pb_check_alignment(size_t requested, size_t provided)
+{
+ return requested <= provided && (provided % requested) == 0 ? TRUE : FALSE;
+}
+
+
+/**
+ * Utility function to check whether the provided alignment is consistent with
+ * the requested or not.
+ */
+static INLINE boolean
+pb_check_usage(unsigned requested, unsigned provided)
+{
+ return (requested & provided) == requested ? TRUE : FALSE;
+}
+
+
+/**
+ * Malloc-based buffer to store data that can't be used by the graphics
+ * hardware.
+ */
+struct pb_buffer *
+pb_malloc_buffer_create(size_t size,
+ const struct pb_desc *desc);
+
+
+void
+pb_init_winsys(struct pipe_winsys *winsys);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*PB_BUFFER_H_*/