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 Jose 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
  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 enum pipe_error
  95 pb_user_buffer_validate(struct pb_buffer *buf,
  96                         struct pb_validate *vl,
  97                         unsigned flags)
  98 {
  99    assert(0);
 100    return PIPE_ERROR;
 101 }
 102
 103
 104 static void
 105 pb_user_buffer_fence(struct pb_buffer *buf,
 106                      struct pipe_fence_handle *fence)
 107 {
 108    assert(0);
 109 }
 110
 111
 112 static void
 113 pb_user_buffer_get_base_buffer(struct pb_buffer *buf,
 114                                struct pb_buffer **base_buf,
 115                                unsigned *offset)
 116 {
 117    *base_buf = buf;
 118    *offset = 0;
 119 }
 120
 121
 122 const struct pb_vtbl
 123 pb_user_buffer_vtbl = {
 124       pb_user_buffer_destroy,
 125       pb_user_buffer_map,
 126       pb_user_buffer_unmap,
 127       pb_user_buffer_validate,
 128       pb_user_buffer_fence,
 129       pb_user_buffer_get_base_buffer
 130 };
 131
 132
 133 static struct pipe_buffer *
 134 pb_winsys_user_buffer_create(struct pipe_winsys *winsys,
 135                              void *data,
 136                              unsigned bytes)
 137 {
 138    struct pb_user_buffer *buf = CALLOC_STRUCT(pb_user_buffer);
 139
 140    if(!buf)
 141       return NULL;
 142
 143    buf->base.base.refcount = 1;
 144    buf->base.base.size = bytes;
 145    buf->base.base.alignment = 0;
 146    buf->base.base.usage = 0;
 147
 148    buf->base.vtbl = &pb_user_buffer_vtbl;
 149    buf->data = data;
 150
 151    return &buf->base.base;
 152 }
 153
 154
 155 static void *
 156 pb_winsys_buffer_map(struct pipe_winsys *winsys,
 157                      struct pipe_buffer *buf,
 158                      unsigned flags)
 159 {
 160    (void)winsys;
 161    return pb_map(pb_buffer(buf), flags);
 162 }
 163
 164
 165 static void
 166 pb_winsys_buffer_unmap(struct pipe_winsys *winsys,
 167                        struct pipe_buffer *buf)
 168 {
 169    (void)winsys;
 170    pb_unmap(pb_buffer(buf));
 171 }
 172
 173
 174 static void
 175 pb_winsys_buffer_destroy(struct pipe_winsys *winsys,
 176                          struct pipe_buffer *buf)
 177 {
 178    (void)winsys;
 179    pb_destroy(pb_buffer(buf));
 180 }
 181
 182
 183 void
 184 pb_init_winsys(struct pipe_winsys *winsys)
 185 {
 186    winsys->user_buffer_create = pb_winsys_user_buffer_create;
 187    winsys->buffer_map = pb_winsys_buffer_map;
 188    winsys->buffer_unmap = pb_winsys_buffer_unmap;
 189    winsys->buffer_destroy = pb_winsys_buffer_destroy;
 190 }