public UnaryOperationNode(ExpressionOperationType opType, ExpressionNode operand)
{
if (!validOperators.Contains(opType))
throw new ArgumentException("Invalid unary operator given!", "opType");
OperationType = opType;
Operand = operand;
}
public BinaryOperationNode(ExpressionOperationType opType, ExpressionNode operandA, ExpressionNode operandB)
{
if (!validOperators.Contains(opType))
throw new ArgumentException("Invalid binary operator given!", "opType");
OperationType = opType;
OperandA = operandA;
OperandB = operandB;
}
public UnaryOperationNode(ExpressionOperationType opType, ExpressionNode operand)
{
if (!validOperators.Contains(opType))
{
throw new ArgumentException("Invalid unary operator given!", nameof(opType));
}
OperationType = opType;
Operand = operand;
}
public BinaryOperationNode(ExpressionOperationType opType, ExpressionNode operandA, ExpressionNode operandB)
{
if (!validOperators.Contains(opType))
{
throw new ArgumentException("Invalid binary operator given!", "opType");
}
OperationType = opType;
OperandA = operandA;
OperandB = operandB;
}
private int EmitOp(int a, int b, ExpressionOperationType opType)
{
// optimize away identity operations.
if(opType == ExpressionOperationType.Add)
{
if((_parsingData.RegisterIsTemporary[a] == false) && (_parsingData.ShaderRegisters[a] == 0))
{
return b;
}
else if((_parsingData.RegisterIsTemporary[b] == false) && (_parsingData.ShaderRegisters[b] == 0))
{
return a;
}
else if((_parsingData.RegisterIsTemporary[a] == false) && (_parsingData.RegisterIsTemporary[b] == false))
{
return GetExpressionConstant(_parsingData.ShaderRegisters[a] + _parsingData.ShaderRegisters[b]);
}
}
else if(opType == ExpressionOperationType.Multiply)
{
if((_parsingData.RegisterIsTemporary[a] == false) && (_parsingData.ShaderRegisters[a] == 1))
{
return b;
}
else if((_parsingData.RegisterIsTemporary[a] == false) && (_parsingData.ShaderRegisters[a] == 0))
{
return a;
}
else if((_parsingData.RegisterIsTemporary[b] == false) && (_parsingData.ShaderRegisters[b] == 1))
{
return a;
}
else if((_parsingData.RegisterIsTemporary[b] == false) && (_parsingData.ShaderRegisters[b] == 0))
{
return b;
}
else if((_parsingData.RegisterIsTemporary[a] == false) && (_parsingData.RegisterIsTemporary[b] == false))
{
return GetExpressionConstant(_parsingData.ShaderRegisters[a] * _parsingData.ShaderRegisters[b]);
}
}
ExpressionOperation op = GetExpressionOperation();
op.OperationType = opType;
op.A = a;
op.B = b;
op.C = GetExpressionTemporary();
return op.C;
}
private int ParseEmitOp(idLexer lexer, int a, ExpressionOperationType opType, int priority)
{
int b = ParseExpressionPriority(lexer, priority);
return EmitOp(a, b, opType);
}