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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 UNPUBLISHED RIGHTS RESERVED UNDER THE COPYRIGHT LAWS OF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: 1.3 $
** $Date: 2000/10/03 18:31:53 $
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "texusint.h"
#define TX_3DF 0x100
#define TX_PPM 0x101
#define TX_BMP 0x102
#define TX_IFF 0x103
#define TX_PCX 0x104
#define TX_SBI 0x105
#define TX_RGT 0x106
#define TX_UNK 0x200 // TGA is unknown from cookie signature.
int
_txReadHeader( FILE *stream, TxMip *info )
{
FxU32 cookie;
int c;
int fformat; // format of the image file.
int status = 0;
if ( stream == NULL ) {
txError("Bad file handle.");
return 0;
}
if ((c=getc( stream )) == EOF ) {
txError("Unexpected end of file");
return 0;
}
cookie = (c << 8);
if ((c=getc( stream )) == EOF ) {
txError("Unexpected end of file");
return 0;
}
cookie |= c;
switch( cookie )
{
case ('P' << 8) | '9': fformat = TX_SBI; break;
case ('P' << 8) | '6': fformat = TX_PPM; break;
case ('3' << 8) | 'd': fformat = TX_3DF; break;
case ('3' << 8) | 'D': fformat = TX_3DF; break;
case 0x01DA: // byte swapped RGT file.
case 0xDA01: fformat = TX_RGT; break;
default: fformat = TX_UNK; break;
}
switch (fformat) {
case TX_SBI: status = _txReadSBIHeader( stream, cookie, info ); break;
case TX_RGT: status = _txReadRGTHeader( stream, cookie, info ); break;
case TX_PPM: status = _txReadPPMHeader( stream, cookie, info ); break;
case TX_3DF: status = _txRead3DFHeader( stream, cookie, info ); break;
case TX_UNK: status = _txReadTGAHeader( stream, cookie, info ); break;
}
/* Not reached. */
return (status) ? fformat : 0;
}
static FxBool
_txReadData( FILE *stream, int fformat, TxMip *info )
{
switch (fformat) {
case TX_SBI: return _txReadSBIData( stream, info );
case TX_RGT: return _txReadRGTData( stream, info );
case TX_PPM: return _txReadPPMData( stream, info );
case TX_3DF: return _txRead3DFData( stream, info );
case TX_UNK: return _txReadTGAData( stream, info );
}
/* Not reached. */
return FXFALSE;
}
FxBool
txMipRead(TxMip *txMip, const char *filename, int prefFormat)
{
FILE *file;
FxBool retval;
file = fopen(filename, "rb");
if( file == NULL )
{
fprintf( stderr,"Error: can't open input file %s\n", filename );
exit(2);
}
retval = txMipReadFromFP( txMip, filename, file, prefFormat );
fclose(file);
return retval;
}
FxBool
txMipReadFromFP(TxMip *txMip, const char *debug_filename, FILE *file, int prefFormat)
{
int i, format;
TxMip txTrue;
int w, h;
if ((prefFormat != GR_TEXFMT_ARGB_8888) &&
(prefFormat != GR_TEXFMT_ANY))
{
txPanic("txMipRead: bad preferred format.");
return FXFALSE;
}
if ( (format = _txReadHeader( file, txMip )) == 0 ) {
fprintf(stderr,"Error: reading info for %s, %s\n",
debug_filename, "");
exit(2);
}
if( txVerbose )
{
fprintf(stderr,"Loading image file ");
fprintf (stderr,"%s (%dw x %dh x %d Bpp x %d mips) .. ", debug_filename,
txMip->width,txMip->height, GR_TEXFMT_SIZE(txMip->format), txMip->depth);
}
/*
* Allocate memory requested in data[0];
*/
w = txMip->width;
h = txMip->height;
txMip->data[0] = txMalloc(txMip->size);
for (i=1; i< TX_MAX_LEVEL; i++) {
if (i >= txMip->depth) {
txMip->data[i] = NULL;
continue;
}
txMip->data[i] = (FxU8*)txMip->data[i-1] +
w * h * GR_TEXFMT_SIZE(txMip->format);
if (w > 1) w >>= 1;
if (h > 1) h >>= 1;
}
if( txVerbose ) {
fprintf( stderr, "mip-> format: %d width: %d height: %d depth: %d size: %d\n",
txMip->format, txMip->width, txMip->height, txMip->depth,
txMip->size );
fflush( stderr );
}
if ( _txReadData( file, format, txMip ) == FXFALSE ) {
fprintf(stderr, "\nError: reading data for %s\n",debug_filename);
exit(4);
}
if( txVerbose )
fprintf(stderr," done.\n");
if (prefFormat == GR_TEXFMT_ANY) return FXTRUE;
/*
* Now convert to ARGB8888 if requested.
*/
txTrue.format = GR_TEXFMT_ARGB_8888;
txTrue.width = txMip->width;
txTrue.height = txMip->height;
txTrue.depth = txMip->depth;
if (txMipAlloc(&txTrue) == FXFALSE) return FXFALSE;
/*
* Dequantize from src to dest.
*/
if( txVerbose )
{
fprintf(stderr, "Dequantizing Input from %s to argb8888.\n",
Format_Name[txMip->format]);
}
txMipDequantize(&txTrue, txMip);
/*
* Free the original mipmap, and copy new mipmap into it.
*/
txFree(txMip->data[0]);
*txMip = txTrue;
return FXTRUE;
}
FxBool _txReadSBIHeader( FILE *stream, FxU32 cookie, TxMip *info){ return FXFALSE;}
FxBool _txReadSBIData( FILE *stream, TxMip *info){ return FXFALSE;}
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