116 lines
2.6 KiB
C
116 lines
2.6 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** This is UNPUBLISHED PROPRIETARY SOURCE CODE of 3Dfx Interactive, Inc.;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 Unpublished -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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*/
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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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FxBool
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_txReadPPMHeader( FILE *stream, FxU32 cookie, TxMip *info)
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{
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char buffer[256];
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FxU32 state = 1;
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FxBool done = FXFALSE;
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if ( stream == NULL ) {
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txPanic("PPM file: Bad file handle.");
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return FXFALSE;
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}
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while( !done && fgets( buffer, 256, stream ) ) {
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char *token;
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if ( buffer[0] == '#' ) continue;
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for (token = strtok( buffer, " \t\n\r" ); token != NULL;
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token = strtok( NULL, " \t\n\r" )) {
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switch( state ) {
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case 1: // Width
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info->width = atoi( token );
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state++;
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break;
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case 2: // height
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info->height = atoi( token );
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state++;
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break;
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case 3: // Color Depth
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info->format = atoi( token );
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if ( info->format != 255 ) {
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txPanic("Unsupported PPM format: max != 255\n");
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return FXFALSE;
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}
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state++;
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done = FXTRUE;
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break;
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default:
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txPanic("PPM file: parse error\n");
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return FXFALSE;
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break;
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}
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}
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}
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if ( state < 4 ) {
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txPanic("PPM file: Read error before end of header.");
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return FXFALSE;
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}
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info->depth = 1;
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info->format = GR_TEXFMT_ARGB_8888;
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info->size = info->width * info->height * 4;
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return FXTRUE;
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}
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FxBool
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_txReadPPMData( FILE *stream, TxMip *info)
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{
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FxU32 numPixels;
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FxU32 *data32 = info->data[0];
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numPixels = info->width * info->height;
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if ( stream == NULL ) {
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txPanic("PPM file: Bad file handle.");
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return FXFALSE;
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}
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// Read in image data
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while (numPixels--) {
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int r, g, b;
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r = getc( stream );
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g = getc( stream );
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b = getc( stream );
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if ( b == EOF ) {
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txPanic("PPM file: Unexpected End of File.");
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return FXFALSE;
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}
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*data32++ = (0xFF << 24) | (r << 16) | (g << 8) | b;
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}
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return FXTRUE;
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}
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