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/*
** THIS SOFTWARE IS SUBJECT TO COPYRIGHT PROTECTION AND IS OFFERED ONLY
** PURSUANT TO THE 3DFX GLIDE GENERAL PUBLIC LICENSE. THERE IS NO RIGHT
** TO USE THE GLIDE TRADEMARK WITHOUT PRIOR WRITTEN PERMISSION OF 3DFX
** INTERACTIVE, INC. A COPY OF THIS LICENSE MAY BE OBTAINED FROM THE
** DISTRIBUTOR OR BY CONTACTING 3DFX INTERACTIVE INC(info@3dfx.com).
** THIS PROGRAM IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
** EXPRESSED OR IMPLIED. SEE THE 3DFX GLIDE GENERAL PUBLIC LICENSE FOR A
** FULL TEXT OF THE NON-WARRANTY PROVISIONS.
**
** USE, DUPLICATION OR DISCLOSURE BY THE GOVERNMENT IS SUBJECT TO
** RESTRICTIONS AS SET FORTH IN SUBDIVISION (C)(1)(II) OF THE RIGHTS IN
** TECHNICAL DATA AND COMPUTER SOFTWARE CLAUSE AT DFARS 252.227-7013,
** AND/OR IN SIMILAR OR SUCCESSOR CLAUSES IN THE FAR, DOD OR NASA FAR
** SUPPLEMENT. UNPUBLISHED RIGHTS RESERVED UNDER THE COPYRIGHT LAWS OF
** THE UNITED STATES.
**
** COPYRIGHT 3DFX INTERACTIVE, INC. 1999, ALL RIGHTS RESERVED
**
** $Revision: 1.2 $
** $Date: 2000/06/15 00:11:40 $
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "texusint.h"
#define B0(x) ((x>>24)&0xFF)
#define B1(x) ((x>>16)&0xFF)
#define B2(x) ((x>>8)&0xFF)
#define B3(x) ((x>>0)&0xFF)
static void
_txImgHalve(int *outdata, int width, int height, int *indata)
{
unsigned int i,j,k;
unsigned int w,h, *p,sum,*q;
if ((outdata == NULL) ||
(width <= 0 ) ||
(height <= 0 ) ||
(width & (width-1)) ||
(height & (height-1)) ||
((width == 1) && (height==1))) return;
w = width>>1;
h = height>>1;
p = (unsigned int *) outdata;
q = (unsigned int *) indata;
if ((w == 0) || (h == 0)) {
// Input and output are a single span each (row or column)
for (j=0; j<w; j++) {
sum = B0(q[0]) + B0(q[1]); sum = (sum + 1) >> 1; k = sum;
sum = B1(q[0]) + B1(q[1]); sum = (sum + 1) >> 1; k = (k << 8) + sum;
sum = B2(q[0]) + B2(q[1]); sum = (sum + 1) >> 1; k = (k << 8) + sum;
sum = B3(q[0]) + B3(q[1]); sum = (sum + 1) >> 1; k = (k << 8) + sum;
*p++ = k;
q += 2;
}
return;
}
for (i=0; i<h; i++) {
for (j=0; j<w; j++) {
sum = B0(q[0]) + B0(q[1]) + B0(q[width]) + B0(q[width+1]);
sum = (sum + 2) >> 2; // add 2 to round, then divide by 4
k = sum;
sum = B1(q[0]) + B1(q[1]) + B1(q[width]) + B1(q[width+1]);
sum = (sum + 2) >> 2; // add 2 to round, then divide by 4
k = (k<<8) + sum;
sum = B2(q[0]) + B2(q[1]) + B2(q[width]) + B2(q[width+1]);
sum = (sum + 2) >> 2; // add 2 to round, then divide by 4
k = (k<<8) + sum;
sum = B3(q[0]) + B3(q[1]) + B3(q[width]) + B3(q[width+1]);
sum = (sum + 2) >> 2; // add 2 to round, then divide by 4
k = (k<<8) + sum;
*p++ = k;
q += 2;
}
q += width;
}
}
void
txMipMipmap(TxMip *txMip)
{
int i, w, h;
w = txMip->width;
h = txMip->height;
if( txVerbose )
{
printf("Mipmapping: .."); fflush(stdout);
printf(" %dx%d", w, h);
}
for (i=1; i< txMip->depth; i++) {
_txImgHalve (txMip->data[i], w, h, txMip->data[i-1]);
if (w > 1) w >>= 1;
if (h > 1) h >>= 1;
if( txVerbose )
{
printf(" %dx%d", w, h); fflush(stdout);
}
}
if( txVerbose )
{
printf(".\n");
}
}
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