intel_tex_layout.c revision 7d8f0fc28239c8023d2d44cbd4c979aa86c31873 
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  * Authors:
29  *   Keith Whitwell <keith@tungstengraphics.com>
30  *   Michel Dänzer <michel@tungstengraphics.com>
31  */
32
33#include "intel_mipmap_tree.h"
34#include "intel_tex_layout.h"
35#include "intel_context.h"
36#include "main/macros.h"
37
38void intel_get_texture_alignment_unit(GLenum internalFormat, GLuint *w, GLuint *h)
39{
40    switch (internalFormat) {
41    case GL_COMPRESSED_RGB_FXT1_3DFX:
42    case GL_COMPRESSED_RGBA_FXT1_3DFX:
43        *w = 8;
44        *h = 4;
45        break;
46
47    case GL_RGB_S3TC:
48    case GL_RGB4_S3TC:
49    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
50    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
51    case GL_RGBA_S3TC:
52    case GL_RGBA4_S3TC:
53    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
54    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
55        *w = 4;
56        *h = 4;
57        break;
58
59    default:
60        *w = 4;
61        *h = 2;
62        break;
63    }
64}
65
66void i945_miptree_layout_2d(struct intel_context *intel,
67			    struct intel_mipmap_tree *mt,
68			    uint32_t tiling, int nr_images)
69{
70   GLuint align_h = 2, align_w = 4;
71   GLuint level;
72   GLuint x = 0;
73   GLuint y = 0;
74   GLuint width = mt->width0;
75   GLuint height = mt->height0;
76
77   mt->total_width = mt->width0;
78   intel_get_texture_alignment_unit(mt->internal_format, &align_w, &align_h);
79
80   if (mt->compressed) {
81       mt->total_width = ALIGN(mt->width0, align_w);
82   }
83
84   /* May need to adjust width to accomodate the placement of
85    * the 2nd mipmap.  This occurs when the alignment
86    * constraints of mipmap placement push the right edge of the
87    * 2nd mipmap out past the width of its parent.
88    */
89   if (mt->first_level != mt->last_level) {
90       GLuint mip1_width;
91
92       if (mt->compressed) {
93           mip1_width = ALIGN(minify(mt->width0), align_w)
94               + ALIGN(minify(minify(mt->width0)), align_w);
95       } else {
96           mip1_width = ALIGN(minify(mt->width0), align_w)
97               + minify(minify(mt->width0));
98       }
99
100       if (mip1_width > mt->total_width) {
101           mt->total_width = mip1_width;
102       }
103   }
104
105   mt->total_height = 0;
106
107   for ( level = mt->first_level ; level <= mt->last_level ; level++ ) {
108      GLuint img_height;
109
110      intel_miptree_set_level_info(mt, level, nr_images, x, y, width,
111				   height, 1);
112
113      if (mt->compressed)
114	 img_height = MAX2(1, height/4);
115      else
116	 img_height = ALIGN(height, align_h);
117
118
119      /* Because the images are packed better, the final offset
120       * might not be the maximal one:
121       */
122      mt->total_height = MAX2(mt->total_height, y + img_height);
123
124      /* Layout_below: step right after second mipmap.
125       */
126      if (level == mt->first_level + 1) {
127	 x += ALIGN(width, align_w);
128      }
129      else {
130	 y += img_height;
131      }
132
133      width  = minify(width);
134      height = minify(height);
135   }
136}
137