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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 "sys/platform.h"
#include "idlib/math/Math.h"
#include "framework/DeclTable.h"
/*
=================
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;
}
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