brw_tex_layout.c revision dd1a868b74ac47ac26f600f2f1eb0dc3f535f31b 
1/*
2 Copyright (C) Intel Corp.  2006.  All Rights Reserved.
3 Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
4 develop this 3D driver.
5
6 Permission is hereby granted, free of charge, to any person obtaining
7 a 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, sublicense, 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
16 portions of the Software.
17
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25
26 **********************************************************************/
27 /*
28  * Authors:
29  *   Keith Whitwell <keith@tungstengraphics.com>
30  */
31
32
33/* Code to layout images in a mipmap tree for i965.
34 */
35
36#include "intel_mipmap_tree.h"
37#include "intel_tex_layout.h"
38#include "intel_context.h"
39#include "macros.h"
40
41#define FILE_DEBUG_FLAG DEBUG_MIPTREE
42
43GLboolean brw_miptree_layout( struct intel_context *intel, struct intel_mipmap_tree *mt )
44{
45   /* XXX: these vary depending on image format:
46    */
47/*    GLint align_w = 4; */
48
49   switch (mt->target) {
50   case GL_TEXTURE_CUBE_MAP:
51   case GL_TEXTURE_3D: {
52      GLuint width  = mt->width0;
53      GLuint height = mt->height0;
54      GLuint depth = mt->depth0;
55      GLuint pack_x_pitch, pack_x_nr;
56      GLuint pack_y_pitch;
57      GLuint level;
58      GLuint align_h = 2;
59      GLuint align_w = 4;
60
61      mt->total_height = 0;
62
63      if (mt->compressed) {
64          align_w = intel_compressed_alignment(mt->internal_format);
65          mt->pitch = ALIGN(width, align_w);
66          pack_y_pitch = (height + 3) / 4;
67      } else {
68          mt->pitch = intel_miptree_pitch_align (intel, mt, mt->width0);
69          pack_y_pitch = ALIGN(mt->height0, align_h);
70      }
71
72      pack_x_pitch = mt->pitch;
73      pack_x_nr = 1;
74
75      for ( level = mt->first_level ; level <= mt->last_level ; level++ ) {
76	 GLuint nr_images = mt->target == GL_TEXTURE_3D ? depth : 6;
77	 GLint x = 0;
78	 GLint y = 0;
79	 GLint q, j;
80
81	 intel_miptree_set_level_info(mt, level, nr_images,
82				      0, mt->total_height,
83				      width, height, depth);
84
85	 for (q = 0; q < nr_images;) {
86	    for (j = 0; j < pack_x_nr && q < nr_images; j++, q++) {
87	       intel_miptree_set_image_offset(mt, level, q, x, y);
88	       x += pack_x_pitch;
89	    }
90
91	    x = 0;
92	    y += pack_y_pitch;
93	 }
94
95
96	 mt->total_height += y;
97	 width  = minify(width);
98	 height = minify(height);
99	 depth  = minify(depth);
100
101    if (mt->compressed) {
102        pack_y_pitch = (height + 3) / 4;
103
104        if (pack_x_pitch > ALIGN(width, align_w)) {
105            pack_x_pitch = ALIGN(width, align_w);
106            pack_x_nr <<= 1;
107        }
108    } else {
109        if (pack_x_pitch > 4) {
110            pack_x_pitch >>= 1;
111            pack_x_nr <<= 1;
112            assert(pack_x_pitch * pack_x_nr <= mt->pitch);
113        }
114
115        if (pack_y_pitch > 2) {
116            pack_y_pitch >>= 1;
117            pack_y_pitch = ALIGN(pack_y_pitch, align_h);
118        }
119    }
120
121      }
122      break;
123   }
124
125   default:
126      i945_miptree_layout_2d(intel, mt);
127      break;
128   }
129   DBG("%s: %dx%dx%d - sz 0x%x\n", __FUNCTION__,
130		mt->pitch,
131		mt->total_height,
132		mt->cpp,
133		mt->pitch * mt->total_height * mt->cpp );
134
135   return GL_TRUE;
136}
137
138