/**

  * $Id: genglsl.c,v 1.1 2007-09-28 07:24:14 nkeynes Exp $

  *

  * Trivial tool to take two shader source files and dump them out in

  * a C file with appropriate escaping.

  *

  * Copyright (c) 2007 Nathan Keynes.

  *

  * This program is free software; you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation; either version 2 of the License, or

  * (at your option) any later version.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  */

 #include <stdio.h>

 #include <stdlib.h>

 /**

  * Copy input to output, quoting " characters as we go.

  */

 void writeShader( FILE *out, FILE *in )

 {

     int ch;

     while( (ch = fgetc(in)) != EOF ) {

 	if( ch == '\"' ) {

 	    fputc( '\\', out );

 	} else if( ch == '\n') {

 	    fputs( "\\n\\", out );

 	}

 	fputc( ch, out );

     }

 }

 int main( int argc, char *argv[] )

 {

     if( argc != 4 ) {

 	fprintf( stderr, "Usage: genglsl <vertex-shader-file> <fragment-shader-file> <output-file>\n");

 	exit(1);

     }

     FILE *vsin = fopen( argv[1], "ro" );

     if( vsin == NULL ) {

 	perror( "Unable to open vertex shader source" );

 	exit(2);

     }

     FILE *fsin = fopen( argv[2], "ro" );

     if( fsin == NULL ) {

 	perror( "Unable to open fragment shader source" );

 	exit(2);

     }

     FILE *out = fopen( argv[3], "wo" );

     if( out == NULL ) {

 	perror( "Unable to open output file" );

 	exit(2);

     }

     fprintf( out, "/**\n * This file is automatically generated - do not edit\n */\n\n" );

     fprintf( out, "const char *glsl_vertex_shader_src = \"" );

     writeShader( out, vsin );

     fprintf( out, "\";\n\n" );

     fprintf( out, "const char *glsl_fragment_shader_src = \"" );

     writeShader( out, fsin );

     fprintf( out, "\";\n\n" );

     fclose( fsin );

     fclose( vsin );

     fclose( out );

     return 0;

 }