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Diffstat (limited to 'src/gallium/auxiliary/pipebuffer/pb_buffer.h')
| -rw-r--r-- | src/gallium/auxiliary/pipebuffer/pb_buffer.h | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/pipebuffer/pb_buffer.h b/src/gallium/auxiliary/pipebuffer/pb_buffer.h new file mode 100644 index 00000000000..8505d333bda --- /dev/null +++ b/src/gallium/auxiliary/pipebuffer/pb_buffer.h @@ -0,0 +1,245 @@ +/************************************************************************** + * + * 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_*/ |