src/gallium/drivers/llvmpipe/lp_buffer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   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 VMWARE 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 #include "util/u_inlines.h"
  30 #include "util/u_memory.h"
  31 #include "util/u_math.h"
  32
  33 #include "lp_winsys.h"
  34 #include "lp_screen.h"
  35 #include "lp_buffer.h"
  36
  37
  38 static void *
  39 llvmpipe_buffer_map(struct pipe_screen *screen,
  40                     struct pipe_buffer *buf,
  41                     unsigned flags)
  42 {
  43    struct llvmpipe_buffer *llvmpipe_buf = llvmpipe_buffer(buf);
  44    return llvmpipe_buf->data;
  45 }
  46
  47
  48 static void
  49 llvmpipe_buffer_unmap(struct pipe_screen *screen,
  50                       struct pipe_buffer *buf)
  51 {
  52 }
  53
  54
  55 static void
  56 llvmpipe_buffer_destroy(struct pipe_buffer *buf)
  57 {
  58    struct llvmpipe_buffer *sbuf = llvmpipe_buffer(buf);
  59
  60    if (!sbuf->userBuffer)
  61       align_free(sbuf->data);
  62
  63    FREE(sbuf);
  64 }
  65
  66
  67 static struct pipe_buffer *
  68 llvmpipe_buffer_create(struct pipe_screen *screen,
  69                        unsigned alignment,
  70                        unsigned usage,
  71                        unsigned size)
  72 {
  73    struct llvmpipe_buffer *buffer = CALLOC_STRUCT(llvmpipe_buffer);
  74
  75    pipe_reference_init(&buffer->base.reference, 1);
  76    buffer->base.screen = screen;
  77    buffer->base.alignment = MAX2(alignment, 16);
  78    buffer->base.usage = usage;
  79    buffer->base.size = size;
  80
  81    buffer->data = align_malloc(size, alignment);
  82
  83    return &buffer->base;
  84 }
  85
  86
  87 /**
  88  * Create buffer which wraps user-space data.
  89  */
  90 static struct pipe_buffer *
  91 llvmpipe_user_buffer_create(struct pipe_screen *screen,
  92                             void *ptr,
  93                             unsigned bytes)
  94 {
  95    struct llvmpipe_buffer *buffer;
  96
  97    buffer = CALLOC_STRUCT(llvmpipe_buffer);
  98    if(!buffer)
  99       return NULL;
 100
 101    pipe_reference_init(&buffer->base.reference, 1);
 102    buffer->base.screen = screen;
 103    buffer->base.size = bytes;
 104    buffer->userBuffer = TRUE;
 105    buffer->data = ptr;
 106
 107    return &buffer->base;
 108 }
 109
 110
 111 void
 112 llvmpipe_init_screen_buffer_funcs(struct pipe_screen *screen)
 113 {
 114    screen->buffer_create = llvmpipe_buffer_create;
 115    screen->user_buffer_create = llvmpipe_user_buffer_create;
 116    screen->buffer_map = llvmpipe_buffer_map;
 117    screen->buffer_unmap = llvmpipe_buffer_unmap;
 118    screen->buffer_destroy = llvmpipe_buffer_destroy;
 119 }