/**

 * $Id$

 *

 * 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;

}