src/gallium/auxiliary/pipebuffer/pb_winsys.c

   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  * Implementation of client buffer (also designated as "user buffers"), which
  31  * are just state-tracker owned data masqueraded as buffers.
  32  *
  33  * \author José Fonseca <jrfonseca@tungstengraphics.com>
  34  */
  35
  36
  37 #include "pipe/p_winsys.h"
  38 #include "util/u_memory.h"
  39
  40 #include "pb_buffer.h"
  41 #include "pb_winsys.h"
  42
  43
  44 /**
  45  * User buffers are special buffers that initially reference memory
  46  * held by the user but which may if necessary copy that memory into
  47  * device memory behind the scenes, for submission to hardware.
  48  *
  49  * These are particularly useful when the referenced data is never
  50  * submitted to hardware at all, in the particular case of software
  51  * vertex processing.
  52  */
  53 struct pb_user_buffer
  54 {
  55    struct pb_buffer base;
  56    void *data;
  57 };
  58
  59
  60 extern const struct pb_vtbl pb_user_buffer_vtbl;
  61
  62
  63 static INLINE struct pb_user_buffer *
  64 pb_user_buffer(struct pb_buffer *buf)
  65 {
  66    assert(buf);
  67    assert(buf->vtbl == &pb_user_buffer_vtbl);
  68    return (struct pb_user_buffer *)buf;
  69 }
  70
  71
  72 static void
  73 pb_user_buffer_destroy(struct pb_buffer *buf)
  74 {
  75    assert(buf);
  76    FREE(buf);
  77 }
  78
  79
  80 static void *
  81 pb_user_buffer_map(struct pb_buffer *buf,
  82                    unsigned flags)
  83 {
  84    return pb_user_buffer(buf)->data;
  85 }
  86
  87
  88 static void
  89 pb_user_buffer_unmap(struct pb_buffer *buf)
  90 {
  91    /* No-op */
  92 }
  93
  94
  95 static void
  96 pb_user_buffer_get_base_buffer(struct pb_buffer *buf,
  97                                struct pb_buffer **base_buf,
  98                                unsigned *offset)
  99 {
 100    *base_buf = buf;
 101    *offset = 0;
 102 }
 103
 104
 105 const struct pb_vtbl
 106 pb_user_buffer_vtbl = {
 107       pb_user_buffer_destroy,
 108       pb_user_buffer_map,
 109       pb_user_buffer_unmap,
 110       pb_user_buffer_get_base_buffer
 111 };
 112
 113
 114 struct pipe_buffer *
 115 pb_winsys_user_buffer_create(struct pipe_winsys *winsys,
 116                              void *data,
 117                              unsigned bytes)
 118 {
 119    struct pb_user_buffer *buf = CALLOC_STRUCT(pb_user_buffer);
 120
 121    if(!buf)
 122       return NULL;
 123
 124    buf->base.base.refcount = 1;
 125    buf->base.base.size = bytes;
 126    buf->base.base.alignment = 0;
 127    buf->base.base.usage = 0;
 128
 129    buf->base.vtbl = &pb_user_buffer_vtbl;
 130    buf->data = data;
 131
 132    return &buf->base.base;
 133 }
 134
 135
 136 void *
 137 pb_winsys_buffer_map(struct pipe_winsys *winsys,
 138                      struct pipe_buffer *buf,
 139                      unsigned flags)
 140 {
 141    (void)winsys;
 142    return pb_map(pb_buffer(buf), flags);
 143 }
 144
 145
 146 void
 147 pb_winsys_buffer_unmap(struct pipe_winsys *winsys,
 148                        struct pipe_buffer *buf)
 149 {
 150    (void)winsys;
 151    pb_unmap(pb_buffer(buf));
 152 }
 153
 154
 155 void
 156 pb_winsys_buffer_destroy(struct pipe_winsys *winsys,
 157                          struct pipe_buffer *buf)
 158 {
 159    (void)winsys;
 160    pb_destroy(pb_buffer(buf));
 161 }
 162
 163
 164 void
 165 pb_init_winsys(struct pipe_winsys *winsys)
 166 {
 167    winsys->user_buffer_create = pb_winsys_user_buffer_create;
 168    winsys->buffer_map = pb_winsys_buffer_map;
 169    winsys->buffer_unmap = pb_winsys_buffer_unmap;
 170    winsys->buffer_destroy = pb_winsys_buffer_destroy;
 171 }