TString UniformHLSL::interfaceBlockMembersString(const TInterfaceBlock &interfaceBlock, TLayoutBlockStorage blockStorage)
{
    TString hlsl;

    Std140PaddingHelper padHelper = mStructureHLSL->getPaddingHelper();

    for (unsigned int typeIndex = 0; typeIndex < interfaceBlock.fields().size(); typeIndex++)
    {
        const TField &field = *interfaceBlock.fields()[typeIndex];
        const TType &fieldType = *field.type();

        if (blockStorage == EbsStd140)
        {
            // 2 and 3 component vector types in some cases need pre-padding
            hlsl += padHelper.prePaddingString(fieldType);
        }

        hlsl += "    " + InterfaceBlockFieldTypeString(field, blockStorage) +
                " " + Decorate(field.name()) + ArrayString(fieldType) + ";\n";

        // must pad out after matrices and arrays, where HLSL usually allows itself room to pack stuff
        if (blockStorage == EbsStd140)
        {
            const bool useHLSLRowMajorPacking = (fieldType.getLayoutQualifier().matrixPacking == EmpColumnMajor);
            hlsl += padHelper.postPaddingString(fieldType, useHLSLRowMajorPacking);
        }
    }

    return hlsl;
}

TString UniformHLSL::uniformBlockString(const TInterfaceBlock &interfaceBlock,
                                        unsigned int registerIndex,
                                        unsigned int arrayIndex)
{
    const TString &arrayIndexString =
        (arrayIndex != GL_INVALID_INDEX ? Decorate(str(arrayIndex)) : "");
    const TString &blockName = interfaceBlock.name() + arrayIndexString;
    TString hlsl;

    hlsl += "cbuffer " + blockName + " : register(b" + str(registerIndex) +
            ")\n"
            "{\n";

    if (interfaceBlock.hasInstanceName())
    {
        hlsl += "    " + InterfaceBlockStructName(interfaceBlock) + " " +
                uniformBlockInstanceString(interfaceBlock, arrayIndex) + ";\n";
    }
    else
    {
        const TLayoutBlockStorage blockStorage = interfaceBlock.blockStorage();
        hlsl += uniformBlockMembersString(interfaceBlock, blockStorage);
    }

    hlsl += "};\n\n";

    return hlsl;
}

static TString InterfaceBlockFieldName(const TInterfaceBlock &interfaceBlock, const TField &field)
{
    if (interfaceBlock.hasInstanceName())
    {
        return interfaceBlock.name() + "." + field.name();
    }
    else
    {
        return field.name();
    }
}

TString UniformHLSL::interfaceBlockInstanceString(const TInterfaceBlock& interfaceBlock, unsigned int arrayIndex)
{
    if (!interfaceBlock.hasInstanceName())
    {
        return "";
    }
    else if (interfaceBlock.isArray())
    {
        return DecoratePrivate(interfaceBlock.instanceName()) + "_" + str(arrayIndex);
    }
    else
    {
        return Decorate(interfaceBlock.instanceName());
    }
}

TString UniformHLSL::interfaceBlockStructString(const TInterfaceBlock &interfaceBlock)
{
    const TLayoutBlockStorage blockStorage = interfaceBlock.blockStorage();

    return "struct " + InterfaceBlockStructName(interfaceBlock) + "\n"
           "{\n" +
           interfaceBlockMembersString(interfaceBlock, blockStorage) +
           "};\n\n";
}

static TString InterfaceBlockStructName(const TInterfaceBlock &interfaceBlock)
{
    return DecoratePrivate(interfaceBlock.name()) + "_type";
}