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shadercompile.cpp
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shadercompile.cpp
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// This file is distributed under a BSD license. See LICENSE.txt for details.
#include "shadercompile.hpp"
#include "_startdx.hpp"
/****************************************************************************/
enum ShaderToken
{
TOK_EOW = 256, // end of word
TOK_WORD,
TOK_DOTDOT, // ".."
// predefined word tokens from here on
TOK_FIRSTPREDEF = 512,
TOK_DCL = TOK_FIRSTPREDEF,
TOK_DEF,
TOK_NOP,
TOK_TEXKILL,
TOK_TEMP,
TOK_ALIAS,
TOK_VMOV,
TOK_IF,
TOK_ELSE,
TOK_ELIF,
TOK_ENDIF,
TOK_FOR,
TOK_ENDFOR,
TOK_WHILE,
TOK_ENDWHILE,
TOK_FLAGS,
TOK_ENDFLAGS,
TOK_ERROR,
};
static const sChar *Tokens[] =
{
"dcl",
"def",
"nop",
"texkill",
"temp",
"alias",
"vmov",
"if",
"else",
"elif",
"endif",
"for",
"endfor",
"while",
"endwhile",
"flags",
"endflags",
"error",
0,
};
struct ShaderInstr
{
sU32 opcode;
const sChar *name;
sInt params;
sU8 vsver;
sU8 psver;
sU16 flags;
};
enum ControlStructure
{
CS_IF,
CS_WHILE,
CS_FOR,
};
static const sChar *controlNames[] =
{
"if",
"while",
"for",
};
enum ShaderInstrFlags
{
SIF_NONE = 0x0000, // no flags
SIF_NOCOISSUE = 0x0001, // cannot be coissued
SIF_VECTORONLY = 0x0002, // must be issued in vector pipe
SIF_REPLICATELAST = 0x0004, // last parameter must have replicate swizzle
SIF_NOSWIZZLE = 0x0008, // source parameters must have default swizzle
SIF_NOSRCDESTEQUAL = 0x0010, // dest != all sources
SIF_DESTMUSTTEMP = 0x0020, // dest register must be temporary
SIF_DESTNOW = 0x0040, // destination write mask may not include w
SIF_VS1xWRITEYORXY = 0x0080, // for vs1.1, may only write .y or .xy
SIF_LASTNOSWIZZLE = 0x0100, // last parameter may not have swizzle
SIF_REPLICATE = 0x0200, // all sources must have replicate swizzle
SIF_NOWRITEMASK = 0x0400, // write mask must be .xyzw (default)
SIF_TEXLD20 = 0x0800, // second parameter must be a sampler
SIF_WRITEXY = 0x1000, // write mask must be .xy
SIF_WRITEXYZ = 0x2000, // write mask must be .xyz
SIF_DESTMUSTA0 = 0x4000, // destination register must be a0
SIF_SRC23DIFFER = 0x8000, // all source register need to be unique
};
static const ShaderInstr ShaderInstrs[] =
{
{ XO_ABS, "abs", 1, 0x20,0x20, SIF_NONE },
{ XO_ADD, "add", 2, 0x10,0x10, SIF_NONE },
{ XO_CMP, "cmp", 3, 0x00,0x10, SIF_NOSRCDESTEQUAL },
{ XO_CND, "cnd", 3, 0x00,0x10, SIF_NONE },
{ XO_CRS, "crs", 2, 0x20,0x20, SIF_NOSWIZZLE|SIF_NOSRCDESTEQUAL|SIF_DESTMUSTTEMP|SIF_DESTNOW },
{ XO_DP2ADD, "dp2add", 3, 0x00,0x20, SIF_REPLICATELAST },
{ XO_DP3, "dp3", 2, 0x10,0x10, SIF_VECTORONLY },
{ XO_DP4, "dp4", 2, 0x10,0x12, SIF_NOCOISSUE },
{ XO_DST, "dst", 2, 0x10,0x00, SIF_NONE },
{ XO_EXP, "exp", 1, 0x10,0x20, SIF_REPLICATELAST },
{ XO_EXPP, "expp", 1, 0x10,0x00, SIF_REPLICATELAST },
{ XO_FRC, "frc", 1, 0x10,0x20, SIF_VS1xWRITEYORXY },
{ XO_LOG, "log", 1, 0x10,0x20, SIF_REPLICATELAST },
{ XO_LOGP, "logp", 1, 0x10,0x00, SIF_REPLICATELAST },
{ XO_LRP, "lrp", 3, 0x20,0x10, SIF_NONE },
{ XO_M3x2, "m3x2", 2, 0x10,0x20, SIF_LASTNOSWIZZLE|SIF_WRITEXY },
{ XO_M3x3, "m3x3", 2, 0x10,0x20, SIF_LASTNOSWIZZLE|SIF_WRITEXYZ },
{ XO_M3x4, "m3x4", 2, 0x10,0x20, SIF_LASTNOSWIZZLE|SIF_NOWRITEMASK },
{ XO_M4x3, "m4x3", 2, 0x10,0x20, SIF_LASTNOSWIZZLE|SIF_WRITEXYZ },
{ XO_M4x4, "m4x4", 2, 0x10,0x20, SIF_LASTNOSWIZZLE|SIF_NOWRITEMASK },
{ XO_MAD, "mad", 3, 0x10,0x10, SIF_NONE },
{ XO_MAX, "max", 2, 0x10,0x20, SIF_NONE },
{ XO_MIN, "min", 2, 0x10,0x20, SIF_NONE },
{ XO_MOV, "mov", 1, 0x10,0x10, SIF_NONE },
{ XO_MOVA, "mova", 1, 0x10,0x00, SIF_DESTMUSTA0 },
{ XO_MUL, "mul", 2, 0x10,0x10, SIF_NONE },
{ XO_NRM, "nrm", 1, 0x20,0x20, SIF_LASTNOSWIZZLE },
{ XO_POW, "pow", 2, 0x20,0x20, SIF_REPLICATE },
{ XO_RCP, "rcp", 1, 0x10,0x20, SIF_REPLICATELAST },
{ XO_RSQ, "rsq", 1, 0x10,0x20, SIF_REPLICATELAST },
{ XO_SGE, "sge", 2, 0x10,0x00, SIF_NONE },
{ XO_SGN, "sgn", 3, 0x20,0x00, SIF_SRC23DIFFER },
{ XO_SLT, "slt", 2, 0x10,0x00, SIF_NONE },
{ XO_SUB, "sub", 2, 0x10,0x10, SIF_NONE },
{ XO_TEX13, "tex", 0, 0x00,0x10, SIF_NOWRITEMASK },
{ XO_TEXLD, "texld", 2, 0x00,0x20, SIF_NOWRITEMASK|SIF_NOSWIZZLE|SIF_TEXLD20|SIF_DESTMUSTTEMP },
{ XO_TEXLDB, "texldb", 2, 0x00,0x20, SIF_NOWRITEMASK|SIF_NOSWIZZLE|SIF_TEXLD20|SIF_DESTMUSTTEMP },
{ XO_TEXLDP, "texldp", 2, 0x00,0x20, SIF_NOWRITEMASK|SIF_NOSWIZZLE|SIF_TEXLD20|SIF_DESTMUSTTEMP },
{ XO_EXT_FREE,"free", 0, 0x10,0x10, SIF_NOWRITEMASK|SIF_NOSWIZZLE|SIF_DESTMUSTTEMP },
{ 0 },
};
static const sChar *emptylist[] =
{
0
};
static const sChar *vsusagesuffix[] =
{
"_position",
"_blendweight",
"_blendindices",
"_normal",
"_psize",
"_texcoord",
"_tangent",
"_binormal",
"_tessfactor",
"_positiont",
"_color",
"_fog",
"_depth",
0
};
static const sChar *pssamplersuffix[] =
{
" ",
" ",
"_2d",
"_cube",
"_volume",
0
};
static const sChar *vs2instmodifier[] =
{
0,
};
static const sChar *ps1instmodifier[] =
{
"_sat",
0,
};
static const sChar *ps1instshift[] =
{
" ",
"_x2",
"_x4",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
"_d2",
0,
};
static const sChar *ps1srcmodifier[] =
{
" ",
"_bias",
"_bx2",
0,
};
static const sChar *ps2instmodifier[] =
{
"_sat",
"_pp",
"_centroid",
0,
};
static const sChar *compareops[] =
{
"==",
"<",
">",
" ",
"!=",
">=",
"<=",
0
};
/****************************************************************************/
static sBool IsSeperator(const sChar *scan)
{
return (*scan == 0 ||
*scan == ' ' || *scan == '\n' || *scan == '\t' || *scan == '\r' ||
scan[0] == '/' && (scan[1] == '/' || scan[1] == '*') ||
*scan == '(' || *scan == ')' || *scan == '[' || *scan == ']' ||
*scan == ',' ||
*scan == '=' || *scan == '!' || *scan == '<' || *scan == '>');
}
void sShaderCompiler::WordScan()
{
sChar *s = Word;
*s = 0;
SubScanPtr = Word;
IsNewLine = sFALSE;
for(;;)
{
// skip whitespace
while(*ScanPtr==' ' || *ScanPtr=='\n' || *ScanPtr=='\t' || *ScanPtr=='\r')
{
if(*ScanPtr=='\n')
{
if(ErrorLine)
return;
Line++;
IsNewLine = sTRUE;
}
ScanPtr++;
}
// handle comments
if(ScanPtr[0]=='/' && ScanPtr[1]=='/') // eol comment
{
ScanPtr+=2;
while(*ScanPtr!='\n' && *ScanPtr!=0)
ScanPtr++;
}
else if(ScanPtr[0]=='/' && ScanPtr[1]=='*') // block comment
{
ScanPtr+=2;
while(*ScanPtr!=0)
{
if(ScanPtr[0]=='*' && ScanPtr[1]=='/')
{
ScanPtr+=2;
break;
}
if(*ScanPtr=='\n')
Line++;
ScanPtr++;
}
if(*ScanPtr==0)
{
ErrorLineNum = Line;
Error("Block comment not closed");
return;
}
}
else // no comment
break;
}
switch(*ScanPtr)
{
case 0:
break;
case '(': case ')':
case '[': case ']':
case ',':
*s++ = *ScanPtr++;
*s++ = 0;
break;
case '!': case '=':
case '<': case '>':
*s++ = *ScanPtr++;
if(*ScanPtr == '=')
*s++ = *ScanPtr++;
*s++ = 0;
break;
default:
while(!IsSeperator(ScanPtr))
{
*s++ = *ScanPtr++;
if(s-Word >= MAXTOKEN)
{
ErrorLineNum = Line;
Error("Token too long");
break;
}
}
*s++ = 0;
break;
}
Scan();
}
sInt sShaderCompiler::Scan()
{
sChar *s = TokValue;
Token = TOK_EOW;
// copy first char, advance if it's not 0
*s++ = *SubScanPtr;
if(!*SubScanPtr)
return Token;
else // recognize one-character tokens
{
sChar ch = *SubScanPtr++;
*s = 0;
if(ch == '-' || ch == '+')
{
Token = ch;
return Token;
}
else if(!*SubScanPtr && ch == '!')
{
Token = ch;
return Token;
}
else if(ch == '.' && *SubScanPtr == '.')
{
SubScanPtr++;
Token = TOK_DOTDOT;
return Token;
}
}
// copy other characters up to next . or _
while(*SubScanPtr && *SubScanPtr != '.' && *SubScanPtr != '_'
&& *SubScanPtr != '-' && *SubScanPtr != '+')
*s++ = *SubScanPtr++;
*s++ = 0;
Token = TOK_WORD;
// try and recognize known word
for(sInt i=0;Tokens[i];i++)
{
if(sCmpString(TokValue,Tokens[i]) == 0)
{
Token = TOK_FIRSTPREDEF + i;
break;
}
}
return Token;
}
void sShaderCompiler::SkipRestOfLine()
{
do
{
WordScan();
}
while(!IsNewLine && *ScanPtr);
}
void sShaderCompiler::ExpectEndOfLine()
{
if(!IsNewLine && *ScanPtr)
{
Error("Extra characters on line!");
ErrorLine = 0;
SkipRestOfLine();
}
}
void sShaderCompiler::ExpectEndOfWord()
{
if(Token != TOK_EOW)
Error("Extra characters in word!");
WordScan();
}
void sShaderCompiler::ExpectEndOfWordAndLine()
{
if(Token != TOK_EOW)
Error("Extra characters in word!");
ErrorLine = 0;
WordScan();
if(!IsNewLine && *ScanPtr)
{
Error("Extra characters on line!");
SkipRestOfLine();
}
}
void sShaderCompiler::Error(const sChar *name,...)
{
if(ErrorLine==0)
{
ErrorCount++;
Errors->PrintF("%s(%d): ",FileName,ErrorLineNum);
Errors->PrintArg(name,&name);
Errors->Print("\n");
}
ErrorLine++;
}
sBool sShaderCompiler::ExpectWord(const sChar *word)
{
if(sCmpString(Word,word))
{
Error("Syntax error: '%s' expected",word);
WordScan();
return sFALSE;
}
WordScan();
return sTRUE;
}
sBool sShaderCompiler::ExpectSubWord(const sChar *subWord)
{
if(sCmpString(TokValue,subWord))
{
Error("Syntax error: '%s' expected",subWord);
Scan();
return sFALSE;
}
Scan();
return sTRUE;
}
void sShaderCompiler::VerifyToken(sInt token)
{
if(Token != token)
Error("Internal parse error");
Scan();
}
/****************************************************************************/
struct sShaderCompiler::Symbol
{
sChar Name[MAXTOKEN+1];
sU32 Register;
sInt FieldOffset;
sInt FieldDimension; // 0 = single value
};
class sShaderCompiler::SymbolTable
{
sArray<Symbol> Table;
sShaderCompiler *Compiler;
Symbol *LookupInternal(const sChar *name);
void AddInternal(const sChar *name,sU32 reg,sInt offs,sInt dim);
public:
SymbolTable *ParentScope;
SymbolTable(sShaderCompiler *compiler,SymbolTable *parent = 0);
~SymbolTable();
void AddReg(const sChar *name,sU32 reg);
void AddField(const sChar *name,sInt offs,sInt dim);
Symbol *Lookup(const sChar *name);
};
sShaderCompiler::Symbol *sShaderCompiler::SymbolTable::LookupInternal(const sChar *name)
{
for(sInt i=0;i<Table.Count;i++)
if(!sCmpString(Table[i].Name,name))
return &Table[i];
return 0;
}
void sShaderCompiler::SymbolTable::AddInternal(const sChar *name,sU32 reg,sInt offs,sInt dim)
{
Symbol *sym = LookupInternal(name);
if(sym)
Compiler->Error("Symbol '%s' already defined in this scope",name);
else
{
sym = Table.Add();
sCopyString(sym->Name,name,MAXTOKEN+1);
sym->Register = reg;
sym->FieldOffset = offs;
sym->FieldDimension = dim;
}
}
sShaderCompiler::SymbolTable::SymbolTable(sShaderCompiler *compiler,sShaderCompiler::SymbolTable *parent)
{
Table.Init();
Compiler = compiler;
ParentScope = parent;
}
sShaderCompiler::SymbolTable::~SymbolTable()
{
Table.Exit();
}
void sShaderCompiler::SymbolTable::AddReg(const sChar *name,sU32 reg)
{
AddInternal(name,reg,0,-1);
}
void sShaderCompiler::SymbolTable::AddField(const sChar *name,sInt offs,sInt dim)
{
AddInternal(name,~0U,offs,dim);
}
sShaderCompiler::Symbol *sShaderCompiler::SymbolTable::Lookup(const sChar *name)
{
for(SymbolTable *table=this;table;table=table->ParentScope)
{
Symbol *sym = table->LookupInternal(name);
if(sym)
return sym;
}
return 0;
}
/****************************************************************************/
void sShaderCompiler::OpenScope()
{
Identifiers = new SymbolTable(this,Identifiers);
}
void sShaderCompiler::EndScope()
{
if(Identifiers->ParentScope)
{
SymbolTable *old = Identifiers;
Identifiers = Identifiers->ParentScope;
delete old;
}
}
sU32 sShaderCompiler::FindSymRegister(const sChar *name)
{
Symbol *sym = Identifiers->Lookup(name);
if(!sym)
{
Error("'%s': Identifier must be declared before use",name);
return ~0;
}
else
return sym->Register;
}
void sShaderCompiler::AddTempRegister(const sChar *name)
{
if(NumTempRegs >= 256)
Error("Only 256 temporaries supported at the moment");
else
Identifiers->AddReg(name,NumTempRegs++);
}
void sShaderCompiler::AddPredefinedSymbols()
{
if(ShaderType == 0) // vertex shader
{
Identifiers->AddReg("oPos",X_OPOS);
Identifiers->AddReg("oFog",X_OFOG);
Identifiers->AddReg("oPts",X_PSIZE);
Identifiers->AddReg("oD0",X_OCOLOR|0);
Identifiers->AddReg("oD1",X_OCOLOR|1);
Identifiers->AddReg("oT0",X_OUV|0);
Identifiers->AddReg("oT1",X_OUV|1);
Identifiers->AddReg("oT2",X_OUV|2);
Identifiers->AddReg("oT3",X_OUV|3);
Identifiers->AddReg("oT4",X_OUV|4);
Identifiers->AddReg("oT5",X_OUV|5);
Identifiers->AddReg("oT6",X_OUV|6);
Identifiers->AddReg("oT7",X_OUV|7);
}
else // pixel shader
{
Identifiers->AddReg("oC0",X_COLOR|0);
Identifiers->AddReg("oC1",X_COLOR|1);
Identifiers->AddReg("oC2",X_COLOR|2);
Identifiers->AddReg("oC3",X_COLOR|3);
Identifiers->AddReg("oDepth",X_DEPTH);
}
}
/****************************************************************************/
void sShaderCompiler::AddFlag(const sChar *name,sInt dim)
{
Flags->AddField(name,NumFlags,dim);
NumFlags += dim ? dim : 1;
if(NumFlags >= 496)
Error("You may not use more than 496 words of flags");
}
/****************************************************************************/
struct sShaderCompiler::Control
{
sInt Type;
sInt Param;
};
void sShaderCompiler::PushControl(sInt type,sInt param)
{
if(ControlStack.Count >= 32)
Error("Control structures nested too deeply! (Max. 32 levels)");
Control *ctrl = ControlStack.Add();
ctrl->Type = type;
ctrl->Param = param;
OpenScope();
}
void sShaderCompiler::PopControl(sInt type)
{
if(!ControlStack.Count)
Error("'end%s' without %s",controlNames[type],controlNames[type]);
else
{
sInt refType = TopControl()->Type;
if(type != refType)
Error("'end%s' read, 'end%s' expected",controlNames[type],controlNames[refType]);
EndScope();
ControlStack.Count--;
}
}
sShaderCompiler::Control *sShaderCompiler::TopControl()
{
static Control defaultControl = { 0 };
if(!ControlStack.Count)
return &defaultControl;
else
return &ControlStack[ControlStack.Count-1];
}
void sShaderCompiler::ElseControl(sBool set)
{
if(!ControlStack.Count)
Error("else without if");
else
{
Control *top = TopControl();
if(top->Type != CS_IF)
Error("'%s' has no 'else'",controlNames[top->Type]);
else if(top->Param)
Error("More than one else per if isn't allowed");
else
{
EndScope();
OpenScope();
if(set)
top->Param = 1;
}
}
}
/****************************************************************************/
struct sShaderCompiler::IndexedPatch
{
sInt Location;
sInt Reg;
};
void sShaderCompiler::Emit(sU32 token)
{
*Output.Add() = token;
}
void sShaderCompiler::EmitIndexBackpatches()
{
sInt baseOffs = Output.Count;
for(sInt i=0;i<IndexedPatches.Count;i++)
{
IndexedPatch *patch = &IndexedPatches[i];
if(baseOffs - patch->Location >= 256)
Error("Code generation error: Indexed backpatch offset exceeds 255");
Emit(XO_EXT_INDEXED);
Emit((baseOffs - patch->Location) | (patch->Reg << 8));
}
IndexedPatches.Count = 0;
}
/****************************************************************************/
sInt sShaderCompiler::CharInList(sChar ch,const sChar *list)
{
sInt i;
for(i=0;list[i] && list[i] != ch;i++);
return list[i] ? i : -1;
}
sInt sShaderCompiler::StringInPrefixList(const sChar *str,const sChar **prefixList,const sChar *&rest)
{
for(sInt i=0;prefixList[i];i++)
{
const sChar *prefix = prefixList[i];
sInt j;
for(j=0;prefix[j] && prefix[j] == str[j];j++);
if(!prefix[j])
{
rest = str + j;
return i;
}
}
return -1;
}
sInt sShaderCompiler::MatchStringList(const sChar **stringList)
{
for(sInt i=0;stringList[i];i++)
{
if(!sCmpString(stringList[i],TokValue))
return i;
}
return -1;
}
sInt sShaderCompiler::DecodeInt(const sChar *what)
{
sInt number = 0;
while(*what)
{
if(*what >= '0' && *what <= '9')
number = (number * 10) + (*what++ - '0');
else
return -1;
}
return number;
}
/****************************************************************************/
sF32 sShaderCompiler::ParseFloat()
{
const sChar *scan = Word;
sF64 val,dec,frac,neg;
val = 0;
dec = 1;
frac = 0;
neg = 1;
if((*scan >= '0' && *scan <= '9') || *scan == '.' || *scan == '-')
{
if(*scan == '-')
{
neg = -1;
scan++;
}
while(*scan >= '0' && *scan <= '9')
val = val * 10 + (*scan++ - '0');
if(*scan == '.')
{
scan++;
while(*scan >= '0' && *scan <= '9')
{
frac = frac * 10 + (*scan++ - '0');
dec *= 10;
}
val += frac / dec;
}
if(*scan != 0)
{
val = 0.0f;
Error("Not a valid float value");
}
}
else
Error("Not a valid float value");
WordScan();
return val * neg;
}
sInt sShaderCompiler::ParseWriteMask()
{
sInt mask = 0;
if(Token == TOK_WORD && TokValue[0] == '.')
{
static const sChar *maskChars[] = { "xyzw", "rgba" };
sInt maskType = -1;
const sChar *namePtr = TokValue + 1;
while(*namePtr)
{
if(maskType == -1)
{
if(CharInList(*namePtr,maskChars[0]) != -1)
maskType = 0;
else if(CharInList(*namePtr,maskChars[1]) != -1)
maskType = 1;
else
Error("Invalid character in write mask");
}
sInt ind = CharInList(*namePtr,maskChars[maskType]);
if(ind == -1)
Error("Invalid character in write mask");
else if(mask & (1 << ind))
Error("Same channel specified twice in write mask (%c)",*namePtr);
mask |= 1 << ind;
namePtr++;
}
}
Scan();
if(mask == 0)
Error("Invalid write mask");
return mask;
}
sU32 sShaderCompiler::ParseSwizzle()
{
if(Token != TOK_WORD || TokValue[0] != '.') // no swizzle
return XS_XYZW;
else
{
const sChar *str = TokValue + 1; // skip '.'
static const sChar *maskChars[] = { "xyzw", "rgba" };
sU32 mask = 0;
sInt lastOne=0,numComponents=0;
sInt maskType = -1;
// swizzle (hopefully) follows
while(*str)
{
if(maskType == -1)
{
if(CharInList(*str,maskChars[0]) != -1)
maskType = 0;
else if(CharInList(*str,maskChars[1]) != -1)
maskType = 1;
else
Error("Invalid character in swizzle mask");
}
lastOne = CharInList(*str,maskChars[maskType]);
if(lastOne == -1)
Error("Invalid character in swizzle mask");
else
mask |= lastOne << (16 + 2*numComponents);
str++;
if(++numComponents > 4)
Error("Swizzle mask too long (4 components only)");
}
while(numComponents < 4)
{
mask |= lastOne << (16 + 2*numComponents);
numComponents++;
}
Scan();
return mask;
}
}
sU32 sShaderCompiler::ParseRegNum()
{
sU32 regNum = 0;
if(Token != TOK_WORD)
Error("'%s': Register name expected",TokValue);
else
{
// check whether register is directly addressed
const sChar *regs[] = { " vca", " vct s" };
sInt regType = CharInList(TokValue[0],regs[ShaderType]);
sInt index = DecodeInt(TokValue+1);
if(regType != -1 && index != -1) // yes, directly addressed
regNum = ((regType & 7) << 28) | ((regType & 24) << 8) | index;
else // no, look up name in symbol table
regNum = FindSymRegister(TokValue);
}
Scan();
if(Token == '+') // indexed addressing
{
Scan();
// actual address reg or virtual index reg?
if(ShaderType == 0 && TokValue[0] == 'a') // assume address reg
{
// strip last char
sInt len=0;
while(TokValue[len])
len++;
sInt lastChar = TokValue[--len];
TokValue[len] = 0;
// decode reg num
sInt num = DecodeInt(TokValue+1);
if(num != 0)
Error("Invalid address register!");
Scan();
sInt regPart = CharInList(lastChar,"xyzw");
if(regPart == -1)
Error("Need to specify address register component, without a dot!");
if(ShaderVer < 0x20 && regPart)
Error("Can only use a0.x in vs.1.1!");
sU8 masks[4] = { 0x00,0x55,0xaa,0xff };
regNum |= 0x2000; // relative addressing