DeclTable.cpp

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/*
===========================================================================

Doom 3 GPL Source Code
Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company. 

This file is part of the Doom 3 GPL Source Code (?Doom 3 Source Code?).  

Doom 3 Source Code 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 3 of the License, or
(at your option) any later version.

Doom 3 Source Code 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.

You should have received a copy of the GNU General Public License
along with Doom 3 Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/

#include "../idlib/precompiled.h"
#pragma hdrstop


/*
=================
idDeclTable::TableLookup
=================
*/
float idDeclTable::TableLookup( float index ) const {
        int iIndex;
        float iFrac;
        
        int domain = values.Num() - 1;

        if ( domain <= 1 ) {
                return 1.0f;
        }

        if ( clamp ) {
                index *= (domain-1);
                if ( index >= domain - 1 ) {
                        return values[domain - 1];
                } else if ( index <= 0 ) {
                        return values[0];
                }
                iIndex = idMath::Ftoi( index );
                iFrac = index - iIndex;
        } else {
                index *= domain;

                if ( index < 0 ) {
                        index += domain * idMath::Ceil( -index / domain );
                }

                iIndex = idMath::FtoiFast( idMath::Floor( index ) );
                iFrac = index - iIndex;
                iIndex = iIndex % domain;
        }

        if ( !snap ) {
                // we duplicated the 0 index at the end at creation time, so we
                // don't need to worry about wrapping the filter
                return values[iIndex] * ( 1.0f - iFrac ) + values[iIndex + 1] * iFrac;
        }
        
        return values[iIndex];
}

/*
=================
idDeclTable::Size
=================
*/
size_t idDeclTable::Size( void ) const {
        return sizeof( idDeclTable ) + values.Allocated();
}

/*
=================
idDeclTable::FreeData
=================
*/
void idDeclTable::FreeData( void ) {
        snap = false;
        clamp = false;
        values.Clear();
}

/*
=================
idDeclTable::DefaultDefinition
=================
*/
const char *idDeclTable::DefaultDefinition( void ) const {
        return "{ { 0 } }";
}

/*
=================
idDeclTable::Parse
=================
*/
bool idDeclTable::Parse( const char *text, const int textLength ) {
        idLexer src;
        idToken token;
        float v;

        src.LoadMemory( text, textLength, GetFileName(), GetLineNum() );
        src.SetFlags( DECL_LEXER_FLAGS );
        src.SkipUntilString( "{" );

        snap = false;
        clamp = false;
        values.Clear();

        while ( 1 ) {
                if ( !src.ReadToken( &token ) ) {
                        break;
                }

                if ( token == "}" ) {
                        break;
                }

                if ( token.Icmp( "snap" ) == 0 ) {
                        snap = true;
                } else if ( token.Icmp( "clamp" ) == 0 ) {
                        clamp = true;
                } else if ( token.Icmp( "{" ) == 0 ) {

                        while ( 1 ) {
                                bool errorFlag;

                                v = src.ParseFloat( &errorFlag );
                                if ( errorFlag ) {
                                        // we got something non-numeric
                                        MakeDefault();
                                        return false;
                                }

                                values.Append( v );

                                src.ReadToken( &token );
                                if ( token == "}" ) {
                                        break;
                                }
                                if ( token == "," ) {
                                        continue;
                                }
                                src.Warning( "expected comma or brace" );
                                MakeDefault();
                                return false;
                        }

                } else {
                        src.Warning( "unknown token '%s'", token.c_str() );
                        MakeDefault();
                        return false;
                }
        }

        // copy the 0 element to the end, so lerping doesn't
        // need to worry about the wrap case
        float val = values[0];          // template bug requires this to not be in the Append()?
        values.Append( val );

        return true;
}