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/**************************************************************************
*
* Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
* Michel Dänzer <michel@tungstengraphics.com>
*/
#include "intel_mipmap_tree.h"
#include "intel_tex_layout.h"
#include "macros.h"
static int align(int value, int alignment)
{
return (value + alignment - 1) & ~(alignment - 1);
}
GLuint intel_compressed_alignment(GLenum internalFormat)
{
GLuint alignment = 4;
switch (internalFormat) {
case GL_COMPRESSED_RGB_FXT1_3DFX:
case GL_COMPRESSED_RGBA_FXT1_3DFX:
alignment = 8;
break;
default:
break;
}
return alignment;
}
void i945_miptree_layout_2d( struct intel_mipmap_tree *mt )
{
GLint align_h = 2, align_w = 4;
GLuint level;
GLuint x = 0;
GLuint y = 0;
GLuint width = mt->width0;
GLuint height = mt->height0;
mt->pitch = mt->width0;
if (mt->compressed) {
align_w = intel_compressed_alignment(mt->internal_format);
mt->pitch = align(mt->width0, align_w);
}
/* May need to adjust pitch to accomodate the placement of
* the 2nd mipmap. This occurs when the alignment
* constraints of mipmap placement push the right edge of the
* 2nd mipmap out past the width of its parent.
*/
if (mt->first_level != mt->last_level) {
GLuint mip1_width;
if (mt->compressed) {
mip1_width = align(minify(mt->width0), align_w)
+ align(minify(minify(mt->width0)), align_w);
} else {
mip1_width = align(minify(mt->width0), align_w)
+ minify(minify(mt->width0));
}
if (mip1_width > mt->pitch) {
mt->pitch = mip1_width;
}
}
/* Pitch must be a whole number of dwords, even though we
* express it in texels.
*/
mt->pitch = align(mt->pitch * mt->cpp, 4) / mt->cpp;
mt->total_height = 0;
for ( level = mt->first_level ; level <= mt->last_level ; level++ ) {
GLuint img_height;
intel_miptree_set_level_info(mt, level, 1, x, y, width,
height, 1);
if (mt->compressed)
img_height = MAX2(1, height/4);
else
img_height = align(height, align_h);
/* Because the images are packed better, the final offset
* might not be the maximal one:
*/
mt->total_height = MAX2(mt->total_height, y + img_height);
/* Layout_below: step right after second mipmap.
*/
if (level == mt->first_level + 1) {
x += align(width, align_w);
}
else {
y += img_height;
}
width = minify(width);
height = minify(height);
}
}
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