src/gallium/auxiliary/pipebuffer/pb_buffer.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * \file
  30  * Generic code for buffers.
  31  *
  32  * Behind a pipe buffle handle there can be DMA buffers, client (or user)
  33  * buffers, regular malloced buffers, etc. This file provides an abstract base
  34  * buffer handle that allows the driver to cope with all those kinds of buffers
  35  * in a more flexible way.
  36  *
  37  * There is no obligation of a winsys driver to use this library. And a pipe
  38  * driver should be completly agnostic about it.
  39  *
  40  * \author Jose Fonseca <jrfonseca@tungstengraphics.com>
  41  */
  42
  43 #ifndef PB_BUFFER_H_
  44 #define PB_BUFFER_H_
  45
  46
  47 #include "pipe/p_compiler.h"
  48 #include "pipe/p_debug.h"
  49 #include "pipe/p_error.h"
  50 #include "pipe/p_state.h"
  51 #include "pipe/p_inlines.h"
  52
  53
  54 #ifdef __cplusplus
  55 extern "C" {
  56 #endif
  57
  58
  59 struct pb_vtbl;
  60 struct pb_validate;
  61
  62
  63 /**
  64  * Buffer description.
  65  *
  66  * Used when allocating the buffer.
  67  */
  68 struct pb_desc
  69 {
  70    unsigned alignment;
  71    unsigned usage;
  72 };
  73
  74
  75 /**
  76  * Base class for all pb_* buffers.
  77  */
  78 struct pb_buffer
  79 {
  80    struct pipe_buffer base;
  81
  82    /**
  83     * Pointer to the virtual function table.
  84     *
  85     * Avoid accessing this table directly. Use the inline functions below
  86     * instead to avoid mistakes.
  87     */
  88    const struct pb_vtbl *vtbl;
  89 };
  90
  91
  92 /**
  93  * Virtual function table for the buffer storage operations.
  94  *
  95  * Note that creation is not done through this table.
  96  */
  97 struct pb_vtbl
  98 {
  99    void (*destroy)( struct pb_buffer *buf );
 100
 101    /**
 102     * Map the entire data store of a buffer object into the client's address.
 103     * flags is bitmask of PIPE_BUFFER_FLAG_READ/WRITE.
 104     */
 105    void *(*map)( struct pb_buffer *buf,
 106                  unsigned flags );
 107
 108    void (*unmap)( struct pb_buffer *buf );
 109
 110    enum pipe_error (*validate)( struct pb_buffer *buf,
 111                                 struct pb_validate *vl,
 112                                 unsigned flags );
 113
 114    void (*fence)( struct pb_buffer *buf,
 115                   struct pipe_fence_handle *fence );
 116
 117    /**
 118     * Get the base buffer and the offset.
 119     *
 120     * A buffer can be subdivided in smaller buffers. This method should return
 121     * the underlaying buffer, and the relative offset.
 122     *
 123     * Buffers without an underlaying base buffer should return themselves, with
 124     * a zero offset.
 125     *
 126     * Note that this will increase the reference count of the base buffer.
 127     */
 128    void (*get_base_buffer)( struct pb_buffer *buf,
 129                             struct pb_buffer **base_buf,
 130                             unsigned *offset );
 131
 132 };
 133
 134
 135 static INLINE struct pipe_buffer *
 136 pb_pipe_buffer( struct pb_buffer *pbuf )
 137 {
 138    assert(pbuf);
 139    return &pbuf->base;
 140 }
 141
 142
 143 static INLINE struct pb_buffer *
 144 pb_buffer( struct pipe_buffer *buf )
 145 {
 146    assert(buf);
 147    /* Could add a magic cookie check on debug builds.
 148     */
 149    return (struct pb_buffer *)buf;
 150 }
 151
 152
 153 /* Accessor functions for pb->vtbl:
 154  */
 155 static INLINE void *
 156 pb_map(struct pb_buffer *buf,
 157        unsigned flags)
 158 {
 159    assert(buf);
 160    if(!buf)
 161       return NULL;
 162    assert(buf->base.refcount > 0);
 163    return buf->vtbl->map(buf, flags);
 164 }
 165
 166
 167 static INLINE void
 168 pb_unmap(struct pb_buffer *buf)
 169 {
 170    assert(buf);
 171    if(!buf)
 172       return;
 173    assert(buf->base.refcount > 0);
 174    buf->vtbl->unmap(buf);
 175 }
 176
 177
 178 static INLINE void
 179 pb_get_base_buffer( struct pb_buffer *buf,
 180                     struct pb_buffer **base_buf,
 181                     unsigned *offset )
 182 {
 183    assert(buf);
 184    if(!buf) {
 185       base_buf = NULL;
 186       offset = 0;
 187       return;
 188    }
 189    assert(buf->base.refcount > 0);
 190    assert(buf->vtbl->get_base_buffer);
 191    buf->vtbl->get_base_buffer(buf, base_buf, offset);
 192    assert(*base_buf);
 193    assert(*offset < (*base_buf)->base.size);
 194 }
 195
 196
 197 static INLINE enum pipe_error
 198 pb_validate(struct pb_buffer *buf, struct pb_validate *vl, unsigned flags)
 199 {
 200    assert(buf);
 201    if(!buf)
 202       return PIPE_ERROR;
 203    assert(buf->vtbl->validate);
 204    return buf->vtbl->validate(buf, vl, flags);
 205 }
 206
 207
 208 static INLINE void
 209 pb_fence(struct pb_buffer *buf, struct pipe_fence_handle *fence)
 210 {
 211    assert(buf);
 212    if(!buf)
 213       return;
 214    assert(buf->vtbl->fence);
 215    buf->vtbl->fence(buf, fence);
 216 }
 217
 218
 219 static INLINE void
 220 pb_destroy(struct pb_buffer *buf)
 221 {
 222    assert(buf);
 223    if(!buf)
 224       return;
 225    assert(buf->base.refcount == 0);
 226    buf->vtbl->destroy(buf);
 227 }
 228
 229
 230 /* XXX: thread safety issues!
 231  */
 232 static INLINE void
 233 pb_reference(struct pb_buffer **dst,
 234              struct pb_buffer *src)
 235 {
 236    if (src) {
 237       assert(src->base.refcount);
 238       src->base.refcount++;
 239    }
 240
 241    if (*dst) {
 242       assert((*dst)->base.refcount);
 243       if(--(*dst)->base.refcount == 0)
 244          pb_destroy( *dst );
 245    }
 246
 247    *dst = src;
 248 }
 249
 250
 251 /**
 252  * Utility function to check whether the provided alignment is consistent with
 253  * the requested or not.
 254  */
 255 static INLINE boolean
 256 pb_check_alignment(size_t requested, size_t provided)
 257 {
 258    return requested <= provided && (provided % requested) == 0 ? TRUE : FALSE;
 259 }
 260
 261
 262 /**
 263  * Utility function to check whether the provided alignment is consistent with
 264  * the requested or not.
 265  */
 266 static INLINE boolean
 267 pb_check_usage(unsigned requested, unsigned provided)
 268 {
 269    return (requested & provided) == requested ? TRUE : FALSE;
 270 }
 271
 272
 273 /**
 274  * Malloc-based buffer to store data that can't be used by the graphics
 275  * hardware.
 276  */
 277 struct pb_buffer *
 278 pb_malloc_buffer_create(size_t size,
 279                         const struct pb_desc *desc);
 280
 281
 282 #ifdef __cplusplus
 283 }
 284 #endif
 285
 286 #endif /*PB_BUFFER_H_*/