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