1 /**************************************************************************
3 * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
29 * Keith Whitwell <keith@tungstengraphics.com>
30 * Michel Dänzer <michel@tungstengraphics.com>
33 #include "intel_mipmap_tree.h"
34 #include "intel_tex_layout.h"
38 static int align(int value
, int alignment
)
40 return (value
+ alignment
- 1) & ~(alignment
- 1);
43 void i945_miptree_layout_2d( struct intel_mipmap_tree
*mt
)
45 GLint align_h
= 2, align_w
= 4;
49 GLuint width
= mt
->width0
;
50 GLuint height
= mt
->height0
;
52 mt
->pitch
= mt
->width0
;
54 /* May need to adjust pitch to accomodate the placement of
55 * the 2nd mipmap. This occurs when the alignment
56 * constraints of mipmap placement push the right edge of the
57 * 2nd mipmap out past the width of its parent.
59 if (mt
->first_level
!= mt
->last_level
) {
60 GLuint mip1_width
= align(minify(mt
->width0
), align_w
)
61 + minify(minify(mt
->width0
));
63 if (mip1_width
> mt
->width0
)
64 mt
->pitch
= mip1_width
;
67 /* Pitch must be a whole number of dwords, even though we
68 * express it in texels.
70 mt
->pitch
= align(mt
->pitch
* mt
->cpp
, 4) / mt
->cpp
;
73 for ( level
= mt
->first_level
; level
<= mt
->last_level
; level
++ ) {
76 intel_miptree_set_level_info(mt
, level
, 1, x
, y
, width
,
77 mt
->compressed
? height
/4 : height
, 1);
80 img_height
= MAX2(1, height
/4);
82 img_height
= align(height
, align_h
);
85 /* Because the images are packed better, the final offset
86 * might not be the maximal one:
88 mt
->total_height
= MAX2(mt
->total_height
, y
+ img_height
);
90 /* Layout_below: step right after second mipmap.
92 if (level
== mt
->first_level
+ 1) {
93 x
+= align(width
, align_w
);
99 width
= minify(width
);
100 height
= minify(height
);