113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
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/*
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** Copyright (c) 1995, 3Dfx Interactive, Inc.
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** All Rights Reserved.
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**
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** This is UNPUBLISHED PROPRIETARY SOURCE CODE of 3Dfx Interactive, Inc.;
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** the contents of this file may not be disclosed to third parties, copied or
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** duplicated in any form, in whole or in part, without the prior written
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** permission of 3Dfx Interactive, Inc.
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**
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** RESTRICTED RIGHTS LEGEND:
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** Use, duplication or disclosure by the Government is subject to restrictions
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** as set forth in subdivision (c)(1)(ii) of the Rights in Technical Data
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** and Computer Software clause at DFARS 252.227-7013, and/or in similar or
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** successor clauses in the FAR, DOD or NASA FAR Supplement. Unpublished -
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** rights reserved under the Copyright Laws of the United States.
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**
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** $Revision$
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** $Date$
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include "texusint.h"
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#define B0(x) ((x>>24)&0xFF)
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#define B1(x) ((x>>16)&0xFF)
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#define B2(x) ((x>>8)&0xFF)
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#define B3(x) ((x>>0)&0xFF)
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static void
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_txImgHalve(int *outdata, int width, int height, int *indata)
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{
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unsigned int i,j,k;
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unsigned int w,h, *p,sum,*q;
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if ((outdata == NULL) ||
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(width <= 0 ) ||
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(height <= 0 ) ||
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(width & (width-1)) ||
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(height & (height-1)) ||
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((width == 1) && (height==1))) return;
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w = width>>1;
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h = height>>1;
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p = (unsigned int *) outdata;
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q = (unsigned int *) indata;
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if ((w == 0) || (h == 0)) {
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// Input and output are a single span each (row or column)
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for (j=0; j<w; j++) {
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sum = B0(q[0]) + B0(q[1]); sum = (sum + 1) >> 1; k = sum;
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sum = B1(q[0]) + B1(q[1]); sum = (sum + 1) >> 1; k = (k << 8) + sum;
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sum = B2(q[0]) + B2(q[1]); sum = (sum + 1) >> 1; k = (k << 8) + sum;
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sum = B3(q[0]) + B3(q[1]); sum = (sum + 1) >> 1; k = (k << 8) + sum;
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*p++ = k;
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q += 2;
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}
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return;
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}
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for (i=0; i<h; i++) {
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for (j=0; j<w; j++) {
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sum = B0(q[0]) + B0(q[1]) + B0(q[width]) + B0(q[width+1]);
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sum = (sum + 2) >> 2; // add 2 to round, then divide by 4
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k = sum;
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sum = B1(q[0]) + B1(q[1]) + B1(q[width]) + B1(q[width+1]);
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sum = (sum + 2) >> 2; // add 2 to round, then divide by 4
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k = (k<<8) + sum;
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sum = B2(q[0]) + B2(q[1]) + B2(q[width]) + B2(q[width+1]);
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sum = (sum + 2) >> 2; // add 2 to round, then divide by 4
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k = (k<<8) + sum;
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sum = B3(q[0]) + B3(q[1]) + B3(q[width]) + B3(q[width+1]);
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sum = (sum + 2) >> 2; // add 2 to round, then divide by 4
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k = (k<<8) + sum;
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*p++ = k;
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q += 2;
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}
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q += width;
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}
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}
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void
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txMipMipmap(TxMip *txMip)
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{
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int i, w, h;
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w = txMip->width;
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h = txMip->height;
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if( txVerbose )
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{
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printf("Mipmapping: .."); fflush(stdout);
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printf(" %dx%d", w, h);
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}
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for (i=1; i< txMip->depth; i++) {
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_txImgHalve (txMip->data[i], w, h, txMip->data[i-1]);
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if (w > 1) w >>= 1;
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if (h > 1) h >>= 1;
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if( txVerbose )
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{
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printf(" %dx%d", w, h); fflush(stdout);
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}
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}
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if( txVerbose )
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{
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printf(".\n");
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}
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}
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