src/gallium/drivers/softpipe/sp_buffer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
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  12  * the following conditions:
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  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
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  27
  28
  29 #include "util/u_inlines.h"
  30 #include "util/u_memory.h"
  31 #include "util/u_math.h"
  32
  33 #include "sp_screen.h"
  34 #include "sp_buffer.h"
  35
  36
  37 static void *
  38 softpipe_buffer_map(struct pipe_screen *screen,
  39                     struct pipe_buffer *buf,
  40                     unsigned flags)
  41 {
  42    struct softpipe_buffer *softpipe_buf = softpipe_buffer(buf);
  43    return softpipe_buf->data;
  44 }
  45
  46
  47 static void
  48 softpipe_buffer_unmap(struct pipe_screen *screen,
  49                       struct pipe_buffer *buf)
  50 {
  51 }
  52
  53
  54 static void
  55 softpipe_buffer_destroy(struct pipe_buffer *buf)
  56 {
  57    struct softpipe_buffer *sbuf = softpipe_buffer(buf);
  58
  59    if (!sbuf->userBuffer)
  60       align_free(sbuf->data);
  61
  62    FREE(sbuf);
  63 }
  64
  65
  66 static struct pipe_buffer *
  67 softpipe_buffer_create(struct pipe_screen *screen,
  68                        unsigned alignment,
  69                        unsigned usage,
  70                        unsigned size)
  71 {
  72    struct softpipe_buffer *buffer = CALLOC_STRUCT(softpipe_buffer);
  73
  74    pipe_reference_init(&buffer->base.reference, 1);
  75    buffer->base.screen = screen;
  76    buffer->base.alignment = MAX2(alignment, 16);
  77    buffer->base.usage = usage;
  78    buffer->base.size = size;
  79
  80    buffer->data = align_malloc(size, alignment);
  81
  82    return &buffer->base;
  83 }
  84
  85
  86 /**
  87  * Create buffer which wraps user-space data.
  88  */
  89 static struct pipe_buffer *
  90 softpipe_user_buffer_create(struct pipe_screen *screen,
  91                             void *ptr,
  92                             unsigned bytes)
  93 {
  94    struct softpipe_buffer *buffer;
  95
  96    buffer = CALLOC_STRUCT(softpipe_buffer);
  97    if(!buffer)
  98       return NULL;
  99
 100    pipe_reference_init(&buffer->base.reference, 1);
 101    buffer->base.screen = screen;
 102    buffer->base.size = bytes;
 103    buffer->userBuffer = TRUE;
 104    buffer->data = ptr;
 105
 106    return &buffer->base;
 107 }
 108
 109
 110 void
 111 softpipe_init_screen_buffer_funcs(struct pipe_screen *screen)
 112 {
 113    screen->buffer_create = softpipe_buffer_create;
 114    screen->user_buffer_create = softpipe_user_buffer_create;
 115    screen->buffer_map = softpipe_buffer_map;
 116    screen->buffer_unmap = softpipe_buffer_unmap;
 117    screen->buffer_destroy = softpipe_buffer_destroy;
 118 }