/************************************************************************** * * 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 Jose Fonseca */ #ifndef PB_BUFFER_H_ #define PB_BUFFER_H_ #include "pipe/p_compiler.h" #include "pipe/p_debug.h" #include "pipe/p_error.h" #include "pipe/p_state.h" #include "pipe/p_inlines.h" #ifdef __cplusplus extern "C" { #endif struct pb_vtbl; struct pb_validate; /** * 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 ); enum pipe_error (*validate)( struct pb_buffer *buf, struct pb_validate *vl, unsigned flags ); void (*fence)( struct pb_buffer *buf, struct pipe_fence_handle *fence ); /** * 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; } assert(buf->vtbl->get_base_buffer); buf->vtbl->get_base_buffer(buf, base_buf, offset); } static INLINE enum pipe_error pb_validate(struct pb_buffer *buf, struct pb_validate *vl, unsigned flags) { assert(buf); if(!buf) return PIPE_ERROR; assert(buf->vtbl->validate); return buf->vtbl->validate(buf, vl, flags); } static INLINE void pb_fence(struct pb_buffer *buf, struct pipe_fence_handle *fence) { assert(buf); if(!buf) return; assert(buf->vtbl->fence); buf->vtbl->fence(buf, fence); } 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_*/