C++ TStructure::fields方法代码示例

void StructureHLSL::storeStd140ElementIndex(const TStructure &structure, bool useHLSLRowMajorPacking)
{
    Std140PaddingHelper padHelper = getPaddingHelper();
    const TFieldList &fields = structure.fields();

    for (unsigned int i = 0; i < fields.size(); i++)
    {
        padHelper.prePadding(*fields[i]->type());
    }

    // Add remaining element index to the global map, for use with nested structs in standard layouts
    const TString &structName = QualifiedStructNameString(structure, useHLSLRowMajorPacking, true);
    mStd140StructElementIndexes[structName] = padHelper.elementIndex();
}

TString StructureHLSL::define(const TStructure &structure, bool useHLSLRowMajorPacking,
                              bool useStd140Packing, Std140PaddingHelper *padHelper)
{
    const TFieldList &fields = structure.fields();
    const bool isNameless = (structure.name() == "");
    const TString &structName = QualifiedStructNameString(structure, useHLSLRowMajorPacking,
                                                          useStd140Packing);
    const TString declareString = (isNameless ? "struct" : "struct " + structName);

    TString string;
    string += declareString + "\n"
              "{\n";

    for (unsigned int i = 0; i < fields.size(); i++)
    {
        const TField &field = *fields[i];
        const TType &fieldType = *field.type();
        const TStructure *fieldStruct = fieldType.getStruct();
        const TString &fieldTypeString = fieldStruct ?
                                         QualifiedStructNameString(*fieldStruct, useHLSLRowMajorPacking,
                                                                   useStd140Packing) :
                                         TypeString(fieldType);

        if (padHelper)
        {
            string += padHelper->prePaddingString(fieldType);
        }

        string += "    " + fieldTypeString + " " + DecorateField(field.name(), structure) + ArrayString(fieldType) + ";\n";

        if (padHelper)
        {
            string += padHelper->postPaddingString(fieldType, useHLSLRowMajorPacking);
        }
    }

    // Nameless structs do not finish with a semicolon and newline, to leave room for an instance variable
    string += (isNameless ? "} " : "};\n");

    return string;
}

TIntermTyped *CreateZeroNode(const TType &type)
{
    TType constType(type);
    constType.setQualifier(EvqConst);

    if (!type.isArray() && type.getBasicType() != EbtStruct)
    {
        size_t size       = constType.getObjectSize();
        TConstantUnion *u = new TConstantUnion[size];
        for (size_t i = 0; i < size; ++i)
        {
            switch (type.getBasicType())
            {
                case EbtFloat:
                    u[i].setFConst(0.0f);
                    break;
                case EbtInt:
                    u[i].setIConst(0);
                    break;
                case EbtUInt:
                    u[i].setUConst(0u);
                    break;
                case EbtBool:
                    u[i].setBConst(false);
                    break;
                default:
                    // CreateZeroNode is called by ParseContext that keeps parsing even when an
                    // error occurs, so it is possible for CreateZeroNode to be called with
                    // non-basic types. This happens only on error condition but CreateZeroNode
                    // needs to return a value with the correct type to continue the typecheck.
                    // That's why we handle non-basic type by setting whatever value, we just need
                    // the type to be right.
                    u[i].setIConst(42);
                    break;
            }
        }

        TIntermConstantUnion *node = new TIntermConstantUnion(u, constType);
        return node;
    }

    if (type.getBasicType() == EbtVoid)
    {
        // Void array. This happens only on error condition, similarly to the case above. We don't
        // have a constructor operator for void, so this needs special handling. We'll end up with a
        // value without the array type, but that should not be a problem.
        while (constType.isArray())
        {
            constType.toArrayElementType();
        }
        return CreateZeroNode(constType);
    }

    TIntermSequence *arguments = new TIntermSequence();

    if (type.isArray())
    {
        TType elementType(type);
        elementType.toArrayElementType();

        size_t arraySize = type.getOutermostArraySize();
        for (size_t i = 0; i < arraySize; ++i)
        {
            arguments->push_back(CreateZeroNode(elementType));
        }
    }
    else
    {
        ASSERT(type.getBasicType() == EbtStruct);

        TStructure *structure = type.getStruct();
        for (const auto &field : structure->fields())
        {
            arguments->push_back(CreateZeroNode(*field->type()));
        }
    }

    return TIntermAggregate::CreateConstructor(constType, arguments);
}