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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 UNPUBLISHED RIGHTS RESERVED UNDER THE COPYRIGHT LAWS OF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"
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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