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/*
Copyright (c) 2011, Adobe Systems Incorporated
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

* Neither the name of Adobe Systems Incorporated nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package com.adobe.utils
{
    // ===========================================================================
    //    Imports
    // ---------------------------------------------------------------------------
    //import flash.display3D.*;
    import flash.utils.*;

    // ===========================================================================
    //    Class
    // ---------------------------------------------------------------------------
    public class AGALMiniAssembler
    {
        // ======================================================================
        //    Properties
        // ----------------------------------------------------------------------
        // AGAL bytes and error buffer
        private var _agalcode:ByteArray                            = null;
        private var _error:String                                = "";

        private var debugEnabled:Boolean                        = false;

        private static var initialized:Boolean                    = false;

        // ======================================================================
        //    Getters
        // ----------------------------------------------------------------------
        public function get error():String                        { return _error; }
        public function get agalcode():ByteArray                { return _agalcode; }

        // ======================================================================
        //    Constructor
        // ----------------------------------------------------------------------
        public function AGALMiniAssembler( debugging:Boolean = false ):void
        {
            debugEnabled = debugging;
            if ( !initialized )
                init();
        }
        // ======================================================================
        //    Methods
        // ----------------------------------------------------------------------
        public function assemble( mode:String, source:String, verbose:Boolean = false ):ByteArray
        {
            var start:uint = getTimer();

            _agalcode = new ByteArray();
            _error = "";

            var isFrag:Boolean = false;

            if ( mode == FRAGMENT )
                isFrag = true
            else if ( mode != VERTEX )
                _error = 'ERROR: mode needs to be "' + FRAGMENT + '" or "' + VERTEX + '" but is "' + mode + '".';

            agalcode.endian = Endian.LITTLE_ENDIAN;
            agalcode.writeByte( 0xa0 );                // tag version
            agalcode.writeUnsignedInt( 0x1 );        // AGAL version, big endian, bit pattern will be 0x01000000
            agalcode.writeByte( 0xa1 );                // tag program id
            agalcode.writeByte( isFrag ? 1 : 0 );    // vertex or fragment

            var lines:Array = source.replace( /[\f\n\r\v]+/g, "\n" ).split( "\n" );
            var nest:int = 0;
            var nops:int = 0;
            var i:int;
            var lng:int = lines.length;

            for ( i = 0; i < lng && _error == ""; i++ )
            {
                var line:String = new String( lines[i] );

                // remove comments
                var startcomment:int = line.search( "//" );
                if ( startcomment != -1 )
                    line = line.slice( 0, startcomment );

                // grab options
                var optsi:int = line.search( /<.*>/g );
                var opts:Array;
                if ( optsi != -1 )
                {
                    opts = line.slice( optsi ).match( /([\w\.\-\+]+)/gi );
                    line = line.slice( 0, optsi );
                }

                // find opcode
                var opCode:Array = line.match( /^\w{3}/ig );
                var opFound:OpCode = OPMAP[ opCode[0] ];

                // if debug is enabled, output the opcodes
                if ( debugEnabled )
                    trace( opFound );

                if ( opFound == null )
                {
                    if ( line.length >= 3 )
                        trace( "warning: bad line "+i+": "+lines[i] );
                    continue;
                }

                line = line.slice( line.search( opFound.name ) + opFound.name.length );

                // nesting check
                if ( opFound.flags & OP_DEC_NEST )
                {
                    nest--;
                    if ( nest < 0 )
                    {
                        _error = "error: conditional closes without open.";
                        break;
                    }
                }
                if ( opFound.flags & OP_INC_NEST )
                {
                    nest++;
                    if ( nest > MAX_NESTING )
                    {
                        _error = "error: nesting to deep, maximum allowed is "+MAX_NESTING+".";
                        break;
                    }
                }
                if ( ( opFound.flags & OP_FRAG_ONLY ) && !isFrag )
                {
                    _error = "error: opcode is only allowed in fragment programs.";
                    break;
                }
                if ( verbose )
                    trace( "emit opcode=" + opFound );

                agalcode.writeUnsignedInt( opFound.emitCode );
                nops++;

                if ( nops > MAX_OPCODES )
                {
                    _error = "error: too many opcodes. maximum is "+MAX_OPCODES+".";
                    break;
                }

                // get operands, use regexp
                var regs:Array = line.match( /vc\[([vof][actps]?)(\d*)?(\.[xyzw](\+\d{1,3})?)?\](\.[xyzw]{1,4})?|([vof][actps]?)(\d*)?(\.[xyzw]{1,4})?/gi );
                if ( regs.length != opFound.numRegister )
                {
                    _error = "error: wrong number of operands. found "+regs.length+" but expected "+opFound.numRegister+".";
                    break;
                }

                var badreg:Boolean    = false;
                var pad:uint        = 64 + 64 + 32;
                var regLength:uint    = regs.length;

                for ( var j:int = 0; j < regLength; j++ )
                {
                    var isRelative:Boolean = false;
                    var relreg:Array = regs[ j ].match( /\[.*\]/ig );
                    if ( relreg.length > 0 )
                    {
                        regs[ j ] = regs[ j ].replace( relreg[ 0 ], "0" );

                        if ( verbose )
                            trace( "IS REL" );
                        isRelative = true;
                    }

                    var res:Array = regs[j].match( /^\b[A-Za-z]{1,2}/ig );
                    var regFound:Register = REGMAP[ res[ 0 ] ];

                    // if debug is enabled, output the registers
                    if ( debugEnabled )
                        trace( regFound );

                    if ( regFound == null )
                    {
                        _error = "error: could not parse operand "+j+" ("+regs[j]+").";
                        badreg = true;
                        break;
                    }

                    if ( isFrag )
                    {
                        if ( !( regFound.flags & REG_FRAG ) )
                        {
                            _error = "error: register operand "+j+" ("+regs[j]+") only allowed in vertex programs.";
                            badreg = true;
                            break;
                        }
                        if ( isRelative )
                        {
                            _error = "error: register operand "+j+" ("+regs[j]+") relative adressing not allowed in fragment programs.";
                            badreg = true;
                            break;
                        }
                    }
                    else
                    {
                        if ( !( regFound.flags & REG_VERT ) )
                        {
                            _error = "error: register operand "+j+" ("+regs[j]+") only allowed in fragment programs.";
                            badreg = true;
                            break;
                        }
                    }

                    regs[j] = regs[j].slice( regs[j].search( regFound.name ) + regFound.name.length );
                    //trace( "REGNUM: " +regs[j] );
                    var idxmatch:Array = isRelative ? relreg[0].match( /\d+/ ) : regs[j].match( /\d+/ );
                    var regidx:uint = 0;

                    if ( idxmatch )
                        regidx = uint( idxmatch[0] );

                    if ( regFound.range < regidx )
                    {
                        _error = "error: register operand "+j+" ("+regs[j]+") index exceeds limit of "+(regFound.range+1)+".";
                        badreg = true;
                        break;
                    }

                    var regmask:uint        = 0;
                    var maskmatch:Array        = regs[j].match( /(\.[xyzw]{1,4})/ );
                    var isDest:Boolean        = ( j == 0 && !( opFound.flags & OP_NO_DEST ) );
                    var isSampler:Boolean    = ( j == 2 && ( opFound.flags & OP_SPECIAL_TEX ) );
                    var reltype:uint        = 0;
                    var relsel:uint            = 0;
                    var reloffset:int        = 0;

                    if ( isDest && isRelative )
                    {
                        _error = "error: relative can not be destination";
                        badreg = true;
                        break;
                    }

                    if ( maskmatch )
                    {
                        regmask = 0;
                        var cv:uint;
                        var maskLength:uint = maskmatch[0].length;
                        for ( var k:int = 1; k < maskLength; k++ )
                        {
                            cv = maskmatch[0].charCodeAt(k) - "x".charCodeAt(0);
                            if ( cv > 2 )
                                cv = 3;
                            if ( isDest )
                                regmask |= 1 << cv;
                            else
                                regmask |= cv << ( ( k - 1 ) << 1 );
                        }
                        if ( !isDest )
                            for ( ; k <= 4; k++ )
                                regmask |= cv << ( ( k - 1 ) << 1 ) // repeat last
                    }
                    else
                    {
                        regmask = isDest ? 0xf : 0xe4; // id swizzle or mask
                    }

                    if ( isRelative )
                    {
                        var relname:Array = relreg[0].match( /[A-Za-z]{1,2}/ig );
                        var regFoundRel:Register = REGMAP[ relname[0]];
                        if ( regFoundRel == null )
                        {
                            _error = "error: bad index register";
                            badreg = true;
                            break;
                        }
                        reltype = regFoundRel.emitCode;
                        var selmatch:Array = relreg[0].match( /(\.[xyzw]{1,1})/ );
                        if ( selmatch.length==0 )
                        {
                            _error = "error: bad index register select";
                            badreg = true;
                            break;
                        }
                        relsel = selmatch[0].charCodeAt(1) - "x".charCodeAt(0);
                        if ( relsel > 2 )
                            relsel = 3;
                        var relofs:Array = relreg[0].match( /\+\d{1,3}/ig );
                        if ( relofs.length > 0 )
                            reloffset = relofs[0];
                        if ( reloffset < 0 || reloffset > 255 )
                        {
                            _error = "error: index offset "+reloffset+" out of bounds. [0..255]";
                            badreg = true;
                            break;
                        }
                        if ( verbose )
                            trace( "RELATIVE: type="+reltype+"=="+relname[0]+" sel="+relsel+"=="+selmatch[0]+" idx="+regidx+" offset="+reloffset );
                    }

                    if ( verbose )
                        trace( "  emit argcode="+regFound+"["+regidx+"]["+regmask+"]" );
                    if ( isDest )
                    {
                        agalcode.writeShort( regidx );
                        agalcode.writeByte( regmask );
                        agalcode.writeByte( regFound.emitCode );
                        pad -= 32;
                    } else
                    {
                        if ( isSampler )
                        {
                            if ( verbose )
                                trace( "  emit sampler" );
                            var samplerbits:uint = 5; // type 5
                            var optsLength:uint = opts.length;
                            var bias:Number = 0;
                            for ( k = 0; k<optsLength; k++ )
                            {
                                if ( verbose )
                                    trace( "    opt: "+opts[k] );
                                var optfound:Sampler = SAMPLEMAP [opts[k]];
                                if ( optfound == null )
                                {
                                    // todo check that it's a number...
                                    //trace( "Warning, unknown sampler option: "+opts[k] );
                                    bias = Number(opts[k]);
                                    if ( verbose )
                                        trace( "    bias: " + bias );
                                }
                                else
                                {
                                    if ( optfound.flag != SAMPLER_SPECIAL_SHIFT )
                                        samplerbits &= ~( 0xf << optfound.flag );
                                    samplerbits |= uint( optfound.mask ) << uint( optfound.flag );
                                }
                            }
                            agalcode.writeShort( regidx );
                            agalcode.writeByte(int(bias*8.0));
                            agalcode.writeByte(0);
                            agalcode.writeUnsignedInt( samplerbits );

                            if ( verbose )
                                trace( "    bits: " + ( samplerbits - 5 ) );
                            pad -= 64;
                        }
                        else
                        {
                            if ( j == 0 )
                            {
                                agalcode.writeUnsignedInt( 0 );
                                pad -= 32;
                            }
                            agalcode.writeShort( regidx );
                            agalcode.writeByte( reloffset );
                            agalcode.writeByte( regmask );
                            agalcode.writeByte( regFound.emitCode );
                            agalcode.writeByte( reltype );
                            agalcode.writeShort( isRelative ? ( relsel | ( 1 << 15 ) ) : 0 );

                            pad -= 64;
                        }
                    }
                }

                // pad unused regs
                for ( j = 0; j < pad; j += 8 )
                    agalcode.writeByte( 0 );

                if ( badreg )
                    break;
            }

            if ( _error != "" )
            {
                _error += "\n  at line " + i + " " + lines[i];
                agalcode.length = 0;
                trace( _error );
            }

            // trace the bytecode bytes if debugging is enabled
            if ( debugEnabled )
            {
                var dbgLine:String = "generated bytecode:";
                var agalLength:uint = agalcode.length;
                for ( var index:uint = 0; index < agalLength; index++ )
                {
                    if ( !( index % 16 ) )
                        dbgLine += "\n";
                    if ( !( index % 4 ) )
                        dbgLine += " ";

                    var byteStr:String = agalcode[ index ].toString( 16 );
                    if ( byteStr.length < 2 )
                        byteStr = "0" + byteStr;

                    dbgLine += byteStr;
                }
                trace( dbgLine );
            }

            if ( verbose )
                trace( "AGALMiniAssembler.assemble time: " + ( ( getTimer() - start ) / 1000 ) + "s" );

            return agalcode;
        }

        static private function init():void
        {
            initialized = true;

            // Fill the dictionaries with opcodes and registers
            OPMAP[ MOV ] = new OpCode( MOV, 2, 0x00, 0 );
            OPMAP[ ADD ] = new OpCode( ADD, 3, 0x01, 0 );
            OPMAP[ SUB ] = new OpCode( SUB, 3, 0x02, 0 );
            OPMAP[ MUL ] = new OpCode( MUL, 3, 0x03, 0 );
            OPMAP[ DIV ] = new OpCode( DIV, 3, 0x04, 0 );
            OPMAP[ RCP ] = new OpCode( RCP, 2, 0x05, 0 );
            OPMAP[ MIN ] = new OpCode( MIN, 3, 0x06, 0 );
            OPMAP[ MAX ] = new OpCode( MAX, 3, 0x07, 0 );
            OPMAP[ FRC ] = new OpCode( FRC, 2, 0x08, 0 );
            OPMAP[ SQT ] = new OpCode( SQT, 2, 0x09, 0 );
            OPMAP[ RSQ ] = new OpCode( RSQ, 2, 0x0a, 0 );
            OPMAP[ POW ] = new OpCode( POW, 3, 0x0b, 0 );
            OPMAP[ LOG ] = new OpCode( LOG, 2, 0x0c, 0 );
            OPMAP[ EXP ] = new OpCode( EXP, 2, 0x0d, 0 );
            OPMAP[ NRM ] = new OpCode( NRM, 2, 0x0e, 0 );
            OPMAP[ SIN ] = new OpCode( SIN, 2, 0x0f, 0 );
            OPMAP[ COS ] = new OpCode( COS, 2, 0x10, 0 );
            OPMAP[ CRS ] = new OpCode( CRS, 3, 0x11, 0 );
            OPMAP[ DP3 ] = new OpCode( DP3, 3, 0x12, 0 );
            OPMAP[ DP4 ] = new OpCode( DP4, 3, 0x13, 0 );
            OPMAP[ ABS ] = new OpCode( ABS, 2, 0x14, 0 );
            OPMAP[ NEG ] = new OpCode( NEG, 2, 0x15, 0 );
            OPMAP[ SAT ] = new OpCode( SAT, 2, 0x16, 0 );
            OPMAP[ M33 ] = new OpCode( M33, 3, 0x17, OP_SPECIAL_MATRIX );
            OPMAP[ M44 ] = new OpCode( M44, 3, 0x18, OP_SPECIAL_MATRIX );
            OPMAP[ M34 ] = new OpCode( M34, 3, 0x19, OP_SPECIAL_MATRIX );
            OPMAP[ IFZ ] = new OpCode( IFZ, 1, 0x1a, OP_NO_DEST | OP_INC_NEST | OP_SCALAR );
            OPMAP[ INZ ] = new OpCode( INZ, 1, 0x1b, OP_NO_DEST | OP_INC_NEST | OP_SCALAR );
            OPMAP[ IFE ] = new OpCode( IFE, 2, 0x1c, OP_NO_DEST | OP_INC_NEST | OP_SCALAR );
            OPMAP[ INE ] = new OpCode( INE, 2, 0x1d, OP_NO_DEST | OP_INC_NEST | OP_SCALAR );
            OPMAP[ IFG ] = new OpCode( IFG, 2, 0x1e, OP_NO_DEST | OP_INC_NEST | OP_SCALAR );
            OPMAP[ IFL ] = new OpCode( IFL, 2, 0x1f, OP_NO_DEST | OP_INC_NEST | OP_SCALAR );
            OPMAP[ IEG ] = new OpCode( IEG, 2, 0x20, OP_NO_DEST | OP_INC_NEST | OP_SCALAR );
            OPMAP[ IEL ] = new OpCode( IEL, 2, 0x21, OP_NO_DEST | OP_INC_NEST | OP_SCALAR );
            OPMAP[ ELS ] = new OpCode( ELS, 0, 0x22, OP_NO_DEST | OP_INC_NEST | OP_DEC_NEST );
            OPMAP[ EIF ] = new OpCode( EIF, 0, 0x23, OP_NO_DEST | OP_DEC_NEST );
            OPMAP[ REP ] = new OpCode( REP, 1, 0x24, OP_NO_DEST | OP_INC_NEST | OP_SCALAR );
            OPMAP[ ERP ] = new OpCode( ERP, 0, 0x25, OP_NO_DEST | OP_DEC_NEST );
            OPMAP[ BRK ] = new OpCode( BRK, 0, 0x26, OP_NO_DEST );
            OPMAP[ KIL ] = new OpCode( KIL, 1, 0x27, OP_NO_DEST | OP_FRAG_ONLY );
            OPMAP[ TEX ] = new OpCode( TEX, 3, 0x28, OP_FRAG_ONLY | OP_SPECIAL_TEX );
            OPMAP[ SGE ] = new OpCode( SGE, 3, 0x29, 0 );
            OPMAP[ SLT ] = new OpCode( SLT, 3, 0x2a, 0 );
            OPMAP[ SGN ] = new OpCode( SGN, 2, 0x2b, 0 );

            REGMAP[ VA ]    = new Register( VA,    "vertex attribute",        0x0,    7,        REG_VERT | REG_READ );
            REGMAP[ VC ]    = new Register( VC,    "vertex constant",        0x1,    127,    REG_VERT | REG_READ );
            REGMAP[ VT ]    = new Register( VT,    "vertex temporary",        0x2,    7,        REG_VERT | REG_WRITE | REG_READ );
            REGMAP[ OP ]    = new Register( OP,    "vertex output",        0x3,    0,        REG_VERT | REG_WRITE );
            REGMAP[ V ]        = new Register( V,    "varying",                0x4,    7,        REG_VERT | REG_FRAG | REG_READ | REG_WRITE );
            REGMAP[ FC ]    = new Register( FC,    "fragment constant",    0x1,    27,        REG_FRAG | REG_READ );
            REGMAP[ FT ]    = new Register( FT,    "fragment temporary",    0x2,    7,        REG_FRAG | REG_WRITE | REG_READ );
            REGMAP[ FS ]    = new Register( FS,    "texture sampler",        0x5,    7,        REG_FRAG | REG_READ );
            REGMAP[ OC ]    = new Register( OC,    "fragment output",        0x3,    0,        REG_FRAG | REG_WRITE );

            SAMPLEMAP[ D2 ]            = new Sampler( D2,            SAMPLER_DIM_SHIFT,        0 );
            SAMPLEMAP[ D3 ]            = new Sampler( D3,            SAMPLER_DIM_SHIFT,        2 );
            SAMPLEMAP[ CUBE ]        = new Sampler( CUBE,        SAMPLER_DIM_SHIFT,        1 );
            SAMPLEMAP[ MIPNEAREST ]    = new Sampler( MIPNEAREST,    SAMPLER_MIPMAP_SHIFT,    1 );
            SAMPLEMAP[ MIPLINEAR ]    = new Sampler( MIPLINEAR,    SAMPLER_MIPMAP_SHIFT,    2 );
            SAMPLEMAP[ MIPNONE ]    = new Sampler( MIPNONE,        SAMPLER_MIPMAP_SHIFT,    0 );
            SAMPLEMAP[ NOMIP ]        = new Sampler( NOMIP,        SAMPLER_MIPMAP_SHIFT,    0 );
            SAMPLEMAP[ NEAREST ]    = new Sampler( NEAREST,        SAMPLER_FILTER_SHIFT,    0 );
            SAMPLEMAP[ LINEAR ]        = new Sampler( LINEAR,        SAMPLER_FILTER_SHIFT,    1 );
            SAMPLEMAP[ CENTROID ]    = new Sampler( CENTROID,    SAMPLER_SPECIAL_SHIFT,    1 << 0 );
            SAMPLEMAP[ SINGLE ]        = new Sampler( SINGLE,        SAMPLER_SPECIAL_SHIFT,    1 << 1 );
            SAMPLEMAP[ DEPTH ]        = new Sampler( DEPTH,        SAMPLER_SPECIAL_SHIFT,    1 << 2 );
            SAMPLEMAP[ REPEAT ]        = new Sampler( REPEAT,        SAMPLER_REPEAT_SHIFT,    1 );
            SAMPLEMAP[ WRAP ]        = new Sampler( WRAP,        SAMPLER_REPEAT_SHIFT,    1 );
            SAMPLEMAP[ CLAMP ]        = new Sampler( CLAMP,        SAMPLER_REPEAT_SHIFT,    0 );
        }

        // ======================================================================
        //    Constants
        // ----------------------------------------------------------------------
        private static const OPMAP:Dictionary                    = new Dictionary();
        private static const REGMAP:Dictionary                    = new Dictionary();
        private static const SAMPLEMAP:Dictionary                = new Dictionary();

        private static const MAX_NESTING:int                    = 4;
        private static const MAX_OPCODES:int                    = 256;

        private static const FRAGMENT:String                    = "fragment";
        private static const VERTEX:String                        = "vertex";

        // masks and shifts
        private static const SAMPLER_DIM_SHIFT:uint                = 12;
        private static const SAMPLER_SPECIAL_SHIFT:uint            = 16;
        private static const SAMPLER_REPEAT_SHIFT:uint            = 20;
        private static const SAMPLER_MIPMAP_SHIFT:uint            = 24;
        private static const SAMPLER_FILTER_SHIFT:uint            = 28;

        // regmap flags
        private static const REG_WRITE:uint                        = 0x1;
        private static const REG_READ:uint                        = 0x2;
        private static const REG_FRAG:uint                        = 0x20;
        private static const REG_VERT:uint                        = 0x40;

        // opmap flags
        private static const OP_SCALAR:uint                        = 0x1;
        private static const OP_INC_NEST:uint                    = 0x2;
        private static const OP_DEC_NEST:uint                    = 0x4;
        private static const OP_SPECIAL_TEX:uint                = 0x8;
        private static const OP_SPECIAL_MATRIX:uint                = 0x10;
        private static const OP_FRAG_ONLY:uint                    = 0x20;
        private static const OP_VERT_ONLY:uint                    = 0x40;
        private static const OP_NO_DEST:uint                    = 0x80;

        // opcodes
        private static const MOV:String                            = "mov";
        private static const ADD:String                            = "add";
        private static const SUB:String                            = "sub";
        private static const MUL:String                            = "mul";
        private static const DIV:String                            = "div";
        private static const RCP:String                            = "rcp";
        private static const MIN:String                            = "min";
        private static const MAX:String                            = "max";
        private static const FRC:String                            = "frc";
        private static const SQT:String                            = "sqt";
        private static const RSQ:String                            = "rsq";
        private static const POW:String                            = "pow";
        private static const LOG:String                            = "log";
        private static const EXP:String                            = "exp";
        private static const NRM:String                            = "nrm";
        private static const SIN:String                            = "sin";
        private static const COS:String                            = "cos";
        private static const CRS:String                            = "crs";
        private static const DP3:String                            = "dp3";
        private static const DP4:String                            = "dp4";
        private static const ABS:String                            = "abs";
        private static const NEG:String                            = "neg";
        private static const SAT:String                            = "sat";
        private static const M33:String                            = "m33";
        private static const M44:String                            = "m44";
        private static const M34:String                            = "m34";
        private static const IFZ:String                            = "ifz";
        private static const INZ:String                            = "inz";
        private static const IFE:String                            = "ife";
        private static const INE:String                            = "ine";
        private static const IFG:String                            = "ifg";
        private static const IFL:String                            = "ifl";
        private static const IEG:String                            = "ieg";
        private static const IEL:String                            = "iel";
        private static const ELS:String                            = "els";
        private static const EIF:String                            = "eif";
        private static const REP:String                            = "rep";
        private static const ERP:String                            = "erp";
        private static const BRK:String                            = "brk";
        private static const KIL:String                            = "kil";
        private static const TEX:String                            = "tex";
        private static const SGE:String                            = "sge";
        private static const SLT:String                            = "slt";
        private static const SGN:String                            = "sgn";

        // registers
        private static const VA:String                            = "va";
        private static const VC:String                            = "vc";
        private static const VT:String                            = "vt";
        private static const OP:String                            = "op";
        private static const V:String                            = "v";
        private static const FC:String                            = "fc";
        private static const FT:String                            = "ft";
        private static const FS:String                            = "fs";
        private static const OC:String                            = "oc";

        // samplers
        private static const D2:String                            = "2d";
        private static const D3:String                            = "3d";
        private static const CUBE:String                        = "cube";
        private static const MIPNEAREST:String                    = "mipnearest";
        private static const MIPLINEAR:String                    = "miplinear";
        private static const MIPNONE:String                        = "mipnone";
        private static const NOMIP:String                        = "nomip";
        private static const NEAREST:String                        = "nearest";
        private static const LINEAR:String                        = "linear";
        private static const CENTROID:String                    = "centroid";
        private static const SINGLE:String                        = "single";
        private static const DEPTH:String                        = "depth";
        private static const REPEAT:String                        = "repeat";
        private static const WRAP:String                        = "wrap";
        private static const CLAMP:String                        = "clamp";
    }
}

// ================================================================================
//    Helper Classes
// --------------------------------------------------------------------------------
{
    // ===========================================================================
    //    Class
    // ---------------------------------------------------------------------------
    class OpCode
    {
        // ======================================================================
        //    Properties
        // ----------------------------------------------------------------------
        private var _emitCode:uint;
        private var _flags:uint;
        private var _name:String;
        private var _numRegister:uint;

        // ======================================================================
        //    Getters
        // ----------------------------------------------------------------------
        public function get emitCode():uint        { return _emitCode; }
        public function get flags():uint        { return _flags; }
        public function get name():String        { return _name; }
        public function get numRegister():uint    { return _numRegister; }

        // ======================================================================
        //    Constructor
        // ----------------------------------------------------------------------
        public function OpCode( name:String, numRegister:uint, emitCode:uint, flags:uint)
        {
            _name = name;
            _numRegister = numRegister;
            _emitCode = emitCode;
            _flags = flags;
        }

        // ======================================================================
        //    Methods
        // ----------------------------------------------------------------------
        public function toString():String
        {
            return "[OpCode name=\""+_name+"\", numRegister="+_numRegister+", emitCode="+_emitCode+", flags="+_flags+"]";
        }
    }

    // ===========================================================================
    //    Class
    // ---------------------------------------------------------------------------
    class Register
    {
        // ======================================================================
        //    Properties
        // ----------------------------------------------------------------------
        private var _emitCode:uint;
        private var _name:String;
        private var _longName:String;
        private var _flags:uint;
        private var _range:uint;

        // ======================================================================
        //    Getters
        // ----------------------------------------------------------------------
        public function get emitCode():uint        { return _emitCode; }
        public function get longName():String    { return _longName; }
        public function get name():String        { return _name; }
        public function get flags():uint        { return _flags; }
        public function get range():uint        { return _range; }

        // ======================================================================
        //    Constructor
        // ----------------------------------------------------------------------
        public function Register( name:String, longName:String, emitCode:uint, range:uint, flags:uint)
        {
            _name = name;
            _longName = longName;
            _emitCode = emitCode;
            _range = range;
            _flags = flags;
        }

        // ======================================================================
        //    Methods
        // ----------------------------------------------------------------------
        public function toString():String
        {
            return "[Register name=\""+_name+"\", longName=\""+_longName+"\", emitCode="+_emitCode+", range="+_range+", flags="+ _flags+"]";
        }
    }

    // ===========================================================================
    //    Class
    // ---------------------------------------------------------------------------
    class Sampler
    {
        // ======================================================================
        //    Properties
        // ----------------------------------------------------------------------
        private var _flag:uint;
        private var _mask:uint;
        private var _name:String;

        // ======================================================================
        //    Getters
        // ----------------------------------------------------------------------
        public function get flag():uint        { return _flag; }
        public function get mask():uint        { return _mask; }
        public function get name():String    { return _name; }

        // ======================================================================
        //    Constructor
        // ----------------------------------------------------------------------
        public function Sampler( name:String, flag:uint, mask:uint )
        {
            _name = name;
            _flag = flag;
            _mask = mask;
        }

        // ======================================================================
        //    Methods
        // ----------------------------------------------------------------------
        public function toString():String
        {
            return "[Sampler name=\""+_name+"\", flag=\""+_flag+"\", mask="+mask+"]";
        }
    }
    }
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