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/*
** Copyright (c) 1995, 3Dfx Interactive, Inc.
** All Rights Reserved.
**
** This is UNPUBLISHED PROPRIETARY SOURCE CODE of 3Dfx Interactive, Inc.;
** the contents of this file may not be disclosed to third parties, copied or
** duplicated in any form, in whole or in part, without the prior written
** permission of 3Dfx Interactive, Inc.
**
** RESTRICTED RIGHTS LEGEND:
** 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 Unpublished -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.
**
** $Revision: 1.1.1.1 $
** $Date: 2000/08/03 00:27:19 $
**
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "texusint.h"
FxBool
_txReadPPMHeader( FILE *stream, FxU32 cookie, TxMip *info)
{
char buffer[256];
FxU32 state = 1;
FxBool done = FXFALSE;
if ( stream == NULL ) {
txPanic("PPM file: Bad file handle.");
return FXFALSE;
}
while( !done && fgets( buffer, 256, stream ) ) {
char *token;
if ( buffer[0] == '#' ) continue;
for (token = strtok( buffer, " \t\n\r" ); token != NULL;
token = strtok( NULL, " \t\n\r" )) {
switch( state ) {
case 1: // Width
info->width = atoi( token );
state++;
break;
case 2: // height
info->height = atoi( token );
state++;
break;
case 3: // Color Depth
info->format = atoi( token );
if ( info->format != 255 ) {
txPanic("Unsupported PPM format: max != 255\n");
return FXFALSE;
}
state++;
done = FXTRUE;
break;
default:
txPanic("PPM file: parse error\n");
return FXFALSE;
break;
}
}
}
if ( state < 4 ) {
txPanic("PPM file: Read error before end of header.");
return FXFALSE;
}
info->depth = 1;
info->format = GR_TEXFMT_ARGB_8888;
info->size = info->width * info->height * 4;
return FXTRUE;
}
FxBool
_txReadPPMData( FILE *stream, TxMip *info)
{
FxU32 numPixels;
FxU32 *data32 = info->data[0];
numPixels = info->width * info->height;
if ( stream == NULL ) {
txPanic("PPM file: Bad file handle.");
return FXFALSE;
}
// Read in image data
while (numPixels--) {
int r, g, b;
r = getc( stream );
g = getc( stream );
b = getc( stream );
if ( b == EOF ) {
txPanic("PPM file: Unexpected End of File.");
return FXFALSE;
}
*data32++ = (0xFF << 24) | (r << 16) | (g << 8) | b;
}
return FXTRUE;
}
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