C++ TIntermTyped::getPrecision方法代码示例

void TIntermAggregate::setBuiltInFunctionPrecision()
{
    // All built-ins returning bool should be handled as ops, not functions.
    ASSERT(getBasicType() != EbtBool);

    TPrecision precision = EbpUndefined;
    TIntermSequence::iterator childIter = mSequence.begin();
    while (childIter != mSequence.end())
    {
        TIntermTyped *typed = (*childIter)->getAsTyped();
        // ESSL spec section 8: texture functions get their precision from the sampler.
        if (typed && IsSampler(typed->getBasicType()))
        {
            precision = typed->getPrecision();
            break;
        }
        ++childIter;
    }
    // ESSL 3.0 spec section 8: textureSize always gets highp precision.
    // All other functions that take a sampler are assumed to be texture functions.
    if (mName.find("textureSize") == 0)
        mType.setPrecision(EbpHigh);
    else
        mType.setPrecision(precision);
}

bool TIntermSelection::promoteTernary(TInfoSink& infoSink)
{
	if (!condition->isVector())
		return true;
	
	int size = condition->getRowsCount();
	TIntermTyped* trueb = trueBlock->getAsTyped();
	TIntermTyped* falseb = falseBlock->getAsTyped();
	if (!trueb || !falseb)
		return false;
	
	if (trueb->getRowsCount() == size && falseb->getRowsCount() == size)
		return true;
	
	// Base assumption: just make the type a float vector
	TPrecision higherPrecision = GetHigherPrecision(trueb->getPrecision(), falseb->getPrecision());
	setType(TType(EbtFloat, higherPrecision, EvqTemporary, 1, size, condition->isMatrix()));
	
	TOperator convert = EOpNull;	
	{
		convert = TOperator( EOpConstructVec2 + size - 2);
		TIntermAggregate *node = new TIntermAggregate(convert);
		node->setLine(trueb->getLine());
		node->setType(TType(condition->getBasicType(), higherPrecision, trueb->getQualifier() == EvqConst ? EvqConst : EvqTemporary, 1, size, condition->isMatrix()));
		node->getNodes().push_back(trueb);
		trueBlock = node;
	}
	{
		convert = TOperator( EOpConstructVec2 + size - 2);
		TIntermAggregate *node = new TIntermAggregate(convert);
		node->setLine(falseb->getLine());
		node->setType(TType(condition->getBasicType(), higherPrecision, falseb->getQualifier() == EvqConst ? EvqConst : EvqTemporary, 1, size, condition->isMatrix()));
		node->getNodes().push_back(falseb);
		falseBlock = node;
	}
	
	return true;
}

void TIntermAggregate::setPrecisionFromChildren()
{
    if (getBasicType() == EbtBool)
    {
        mType.setPrecision(EbpUndefined);
        return;
    }

    TPrecision precision = EbpUndefined;
    TIntermSequence::iterator childIter = mSequence.begin();
    while (childIter != mSequence.end())
    {
        TIntermTyped *typed = (*childIter)->getAsTyped();
        if (typed)
            precision = GetHigherPrecision(typed->getPrecision(), precision);
        ++childIter;
    }
    mType.setPrecision(precision);
}

// Add one node as the parent of another that it operates on.
TIntermTyped* ir_add_unary_math(TOperator op, TIntermNode* childNode, TSourceLoc line, TParseContext& ctx)
{
   TIntermUnary* node;
   TIntermTyped* child = childNode->getAsTyped();

   if (child == 0)
   {
      ctx.infoSink.info.message(EPrefixInternalError, "Bad type in AddUnaryMath", line);
      return 0;
   }

   switch (op)
   {
   case EOpLogicalNot:
      if (!child->isScalar())
         return 0;
      break;

   case EOpPostIncrement:
   case EOpPreIncrement:
   case EOpPostDecrement:
   case EOpPreDecrement:
   case EOpNegative:
      if (child->getType().getBasicType() == EbtStruct || child->getType().isArray())
         return 0;
   default: break;
   }

   //
   // Do we need to promote the operand?
   //
   // Note: Implicit promotions were removed from the language.
   //
   TBasicType newType = EbtVoid;
   switch (op)
   {
   case EOpConstructInt:   newType = EbtInt;   break;
   case EOpConstructBool:  newType = EbtBool;  break;
   case EOpConstructFloat: newType = EbtFloat; break;
   case EOpLogicalNot:     newType = EbtBool; break;
   default: break;
   }

   if (newType != EbtVoid)
   {
      child = ir_add_conversion(op, TType(newType, child->getPrecision(), EvqTemporary, child->getColsCount(), child->getRowsCount(), 
                                      child->isMatrix(), 
                                      child->isArray()),
                            child, ctx.infoSink);
      if (child == 0)
         return 0;
   }

   //
   // For constructors, we are now done, it's all in the conversion.
   //
   switch (op)
   {
   case EOpConstructInt:
   case EOpConstructBool:
   case EOpConstructFloat:
      return child;
   default: break;
   }

   TIntermConstant* childConst = child->getAsConstant();

   //
   // Make a new node for the operator.
   //
   node = new TIntermUnary(op);
   if (line.line == 0)
      line = child->getLine();
   node->setLine(line);
   node->setOperand(child);

   if (! node->promote(ctx))
      return 0;
	
	
	//
	// See if we can fold constants
	
	if (childConst)
	{
		TIntermConstant* FoldUnaryConstantExpression(TOperator op, TIntermConstant* node);
		TIntermConstant* res = FoldUnaryConstantExpression(node->getOp(), childConst);
		if (res)
		{
			delete node;
			return res;
		}
	}
	

	return node;
}

//
// Add one node as the parent of another that it operates on.
//
// Returns the added node.
//
TIntermTyped* TIntermediate::addUnaryMath(TOperator op, TIntermNode* childNode, TSourceLoc line, TSymbolTable& symbolTable)
{
    TIntermUnary* node;
    TIntermTyped* child = childNode->getAsTyped();

    if (child == 0) {
        infoSink.info.message(EPrefixInternalError, "Bad type in AddUnaryMath", line);
        return 0;
    }

    switch (op) {
        case EOpLogicalNot:
            if (child->getType().getBasicType() != EbtBool || child->getType().isMatrix() || child->getType().isArray() || child->getType().isVector()) {
                return 0;
            }
            break;

        case EOpPostIncrement:
        case EOpPreIncrement:
        case EOpPostDecrement:
        case EOpPreDecrement:
        case EOpNegative:
            if (child->getType().getBasicType() == EbtStruct || child->getType().isArray())
                return 0;
        default: break;
    }

    //
    // Do we need to promote the operand?
    //
    // Note: Implicit promotions were removed from the language.
    //
    TBasicType newType = EbtVoid;
    switch (op) {
        case EOpConstructInt:   newType = EbtInt;   break;
        case EOpConstructBool:  newType = EbtBool;  break;
        case EOpConstructFloat: newType = EbtFloat; break;
        default: break;
    }

    if (newType != EbtVoid) {
        child = addConversion(op, TType(newType, child->getPrecision(), EvqTemporary,
            child->getNominalSize(),
            child->isMatrix(),
            child->isArray()),
            child);
        if (child == 0)
            return 0;
    }

    //
    // For constructors, we are now done, it's all in the conversion.
    //
    switch (op) {
        case EOpConstructInt:
        case EOpConstructBool:
        case EOpConstructFloat:
            return child;
        default: break;
    }

    TIntermConstantUnion *childTempConstant = 0;
    if (child->getAsConstantUnion())
        childTempConstant = child->getAsConstantUnion();

    //
    // Make a new node for the operator.
    //
    node = new TIntermUnary(op);
    if (line == 0)
        line = child->getLine();
    node->setLine(line);
    node->setOperand(child);

    if (! node->promote(infoSink))
        return 0;

    if (childTempConstant)  {
        TIntermTyped* newChild = childTempConstant->fold(op, 0, infoSink);

        if (newChild)
            return newChild;
    }

    return node;
}