src/mesa/pipe/i915simple/i915_regions.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 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 /* Provide additional functionality on top of bufmgr buffers:
  29  *   - 2d semantics and blit operations (XXX: remove/simplify blits??)
  30  *   - refcounting of buffers for multiple images in a buffer.
  31  *   - refcounting of buffer mappings.
  32  */
  33
  34 #include "pipe/p_defines.h"
  35 #include "pipe/p_winsys.h"
  36 #include "i915_context.h"
  37
  38
  39
  40
  41 static ubyte *
  42 i915_region_map(struct pipe_context *pipe, struct pipe_region *region)
  43 {
  44    struct i915_context *i915 = i915_context( pipe );
  45
  46    if (!region->map_refcount++) {
  47       region->map = i915->pipe.winsys->buffer_map( i915->pipe.winsys,
  48                                                    region->buffer,
  49                                                    PIPE_BUFFER_FLAG_WRITE |
  50                                                    PIPE_BUFFER_FLAG_READ);
  51    }
  52
  53    return region->map;
  54 }
  55
  56 static void
  57 i915_region_unmap(struct pipe_context *pipe, struct pipe_region *region)
  58 {
  59    struct i915_context *i915 = i915_context( pipe );
  60
  61    if (region->map_refcount > 0) {
  62       assert(region->map);
  63       if (!--region->map_refcount) {
  64          i915->pipe.winsys->buffer_unmap( i915->pipe.winsys,
  65                                           region->buffer );
  66          region->map = NULL;
  67       }
  68    }
  69 }
  70
  71
  72 void
  73 i915_init_region_functions(struct i915_context *i915)
  74 {
  75    i915->pipe.region_map = i915_region_map;
  76    i915->pipe.region_unmap = i915_region_unmap;
  77 }
  78