C++ TType::getBasicType方法代码示例

TString TOutputGLSLBase::getTypeName(const TType& type)
{
    TInfoSinkBase out;
    if (type.isMatrix())
    {
        out << "mat";
        out << type.getNominalSize();
    }
    else if (type.isVector())
    {
        switch (type.getBasicType())
        {
            case EbtFloat: out << "vec"; break;
            case EbtInt: out << "ivec"; break;
            case EbtBool: out << "bvec"; break;
            default: UNREACHABLE(); break;
        }
        out << type.getNominalSize();
    }
    else
    {
        if (type.getBasicType() == EbtStruct)
            out << hashName(type.getTypeName());
        else
            out << type.getBasicString();
    }
    return TString(out.c_str());
}

// Accumulate locations used for inputs, outputs, and uniforms, and check for collisions
// as the accumulation is done.
//
// Returns < 0 if no collision, >= 0 if collision and the value returned is a colliding value.
//
// typeCollision is set to true if there is no direct collision, but the types in the same location
// are different.
//
int TIntermediate::addUsedLocation(const TQualifier& qualifier, const TType& type, bool& typeCollision)
{
    typeCollision = false;

    int set;
    if (qualifier.isPipeInput())
        set = 0;
    else if (qualifier.isPipeOutput())
        set = 1;
    else if (qualifier.storage == EvqUniform)
        set = 2;
    else if (qualifier.storage == EvqBuffer)
        set = 3;
    else
        return -1;

    int size;
    if (qualifier.isUniformOrBuffer()) {
        if (type.isArray())
            size = type.getCumulativeArraySize();
        else
            size = 1;
    } else {
        // Strip off the outer array dimension for those having an extra one.
        if (type.isArray() && qualifier.isArrayedIo(language)) {
            TType elementType(type, 0);
            size = computeTypeLocationSize(elementType);
        } else
            size = computeTypeLocationSize(type);
    }

    TRange locationRange(qualifier.layoutLocation, qualifier.layoutLocation + size - 1);
    TRange componentRange(0, 3);
    if (qualifier.hasComponent()) {
        componentRange.start = qualifier.layoutComponent;
        componentRange.last = componentRange.start + type.getVectorSize() - 1;
    }
    TIoRange range(locationRange, componentRange, type.getBasicType(), qualifier.hasIndex() ? qualifier.layoutIndex : 0);

    // check for collisions, except for vertex inputs on desktop
    if (! (profile != EEsProfile && language == EShLangVertex && qualifier.isPipeInput())) {
        for (size_t r = 0; r < usedIo[set].size(); ++r) {
            if (range.overlap(usedIo[set][r])) {
                // there is a collision; pick one
                return std::max(locationRange.start, usedIo[set][r].location.start);
            } else if (locationRange.overlap(usedIo[set][r].location) && type.getBasicType() != usedIo[set][r].basicType) {
                // aliased-type mismatch
                typeCollision = true;
                return std::max(locationRange.start, usedIo[set][r].location.start);
            }
        }
    }

    usedIo[set].push_back(range);

    return -1; // no collision
}

bool TParseContext::parameterSamplerErrorCheck(int line, TQualifier qualifier, const TType& type)
{
    if ((qualifier == EvqOut || qualifier == EvqInOut) && 
             type.getBasicType() != EbtStruct && IsSampler(type.getBasicType())) {
        error(line, "samplers cannot be output parameters", type.getBasicString(), "");
        return true;
    }

    return false;
}

void UniformHLSL::outputHLSL4_0_FL9_3Sampler(TInfoSinkBase &out,
                                             const TType &type,
                                             const TName &name,
                                             const unsigned int registerIndex)
{
    out << "uniform " << SamplerString(type.getBasicType()) << " sampler_"
        << DecorateUniform(name, type) << ArrayString(type) << " : register(s" << str(registerIndex)
        << ");\n";
    out << "uniform " << TextureString(type.getBasicType()) << " texture_"
        << DecorateUniform(name, type) << ArrayString(type) << " : register(t" << str(registerIndex)
        << ");\n";
}

bool TParseContext::containsSampler(TType& type)
{
    if (IsSampler(type.getBasicType()))
        return true;

    if (type.getBasicType() == EbtStruct) {
        TTypeList& structure = *type.getStruct();
        for (unsigned int i = 0; i < structure.size(); ++i) {
            if (containsSampler(*structure[i].type))
                return true;
        }
    }

    return false;
}

TString TOutputGLSLBase::getTypeName(const TType &type)
{
    if (type.getBasicType() == EbtStruct)
        return hashName(type.getStruct()->name());
    else
        return type.getBuiltInTypeNameString();
}

void TOutputGLSLBase::writeVariableType(const TType& type)
{
    TInfoSinkBase& out = objSink();
    TQualifier qualifier = type.getQualifier();
    // TODO(alokp): Validate qualifier for variable declarations.
    if ((qualifier != EvqTemporary) && (qualifier != EvqGlobal))
        out << type.getQualifierString() << " ";
    // Declare the struct if we have not done so already.
    if ((type.getBasicType() == EbtStruct) &&
        (mDeclaredStructs.find(type.getTypeName()) == mDeclaredStructs.end()))
    {
        out << "struct " << type.getTypeName() << "{\n";
        const TTypeList* structure = type.getStruct();
        ASSERT(structure != NULL);
        for (size_t i = 0; i < structure->size(); ++i)
        {
            const TType* fieldType = (*structure)[i].type;
            ASSERT(fieldType != NULL);
            if (writeVariablePrecision(fieldType->getPrecision()))
                out << " ";
            out << getTypeName(*fieldType) << " " << fieldType->getFieldName();
            if (fieldType->isArray())
                out << arrayBrackets(*fieldType);
            out << ";\n";
        }
        out << "}";
        mDeclaredStructs.insert(type.getTypeName());
    }
    else
    {
        if (writeVariablePrecision(type.getPrecision()))
            out << " ";
        out << getTypeName(type);
    }
}

TString TextureString(const TType &type)
{
    switch (type.getBasicType())
    {
      case EbtSampler2D:            return "Texture2D";
      case EbtSamplerCube:          return "TextureCube";
      case EbtSamplerExternalOES:   return "Texture2D";
      case EbtSampler2DArray:       return "Texture2DArray";
      case EbtSampler3D:            return "Texture3D";
      case EbtISampler2D:           return "Texture2D<int4>";
      case EbtISampler3D:           return "Texture3D<int4>";
      case EbtISamplerCube:         return "Texture2DArray<int4>";
      case EbtISampler2DArray:      return "Texture2DArray<int4>";
      case EbtUSampler2D:           return "Texture2D<uint4>";
      case EbtUSampler3D:           return "Texture3D<uint4>";
      case EbtUSamplerCube:         return "Texture2DArray<uint4>";
      case EbtUSampler2DArray:      return "Texture2DArray<uint4>";
      case EbtSampler2DShadow:      return "Texture2D";
      case EbtSamplerCubeShadow:    return "TextureCube";
      case EbtSampler2DArrayShadow: return "Texture2DArray";
      default: UNREACHABLE();
    }

    return "<unknown texture type>";
}

void TOutputGLSLBase::writeVariableType(const TType &type)
{
    TInfoSinkBase &out = objSink();
    TQualifier qualifier = type.getQualifier();
    if (qualifier != EvqTemporary && qualifier != EvqGlobal)
    {
        out << type.getQualifierString() << " ";
    }
    // Declare the struct if we have not done so already.
    if (type.getBasicType() == EbtStruct && !structDeclared(type.getStruct()))
    {
        TStructure *structure = type.getStruct();

        declareStruct(structure);

        if (!structure->name().empty())
        {
            mDeclaredStructs.insert(structure->uniqueId());
        }
    }
    else
    {
        if (writeVariablePrecision(type.getPrecision()))
            out << " ";
        out << getTypeName(type);
    }
}

unsigned int UniformHLSL::assignUniformRegister(const TType &type,
                                                const TString &name,
                                                unsigned int *outRegisterCount)
{
    unsigned int registerIndex = (IsSampler(type.getBasicType()) ? mSamplerRegister : mUniformRegister);

    const Uniform *uniform = findUniformByName(name);
    ASSERT(uniform);

    mUniformRegisterMap[uniform->name] = registerIndex;

    unsigned int registerCount = HLSLVariableRegisterCount(*uniform, mOutputType);

    if (gl::IsSamplerType(uniform->type))
    {
        mSamplerRegister += registerCount;
    }
    else
    {
        mUniformRegister += registerCount;
    }
    if (outRegisterCount)
    {
        *outRegisterCount = registerCount;
    }
    return registerIndex;
}

// Recursively figure out how many bytes of xfb buffer are used by the given type.
// Return the size of type, in bytes.
// Sets containsDouble to true if the type contains a double.
// N.B. Caller must set containsDouble to false before calling.
unsigned int TIntermediate::computeTypeXfbSize(const TType& type, bool& containsDouble) const
{
    // "...if applied to an aggregate containing a double, the offset must also be a multiple of 8, 
    // and the space taken in the buffer will be a multiple of 8.
    // ...within the qualified entity, subsequent components are each 
    // assigned, in order, to the next available offset aligned to a multiple of
    // that component's size.  Aggregate types are flattened down to the component
    // level to get this sequence of components."

    if (type.isArray()) {        
        // TODO: perf: this can be flattened by using getCumulativeArraySize(), and a deref that discards all arrayness
        assert(type.isExplicitlySizedArray());
        TType elementType(type, 0);
        return type.getOuterArraySize() * computeTypeXfbSize(elementType, containsDouble);
    }

    if (type.isStruct()) {
        unsigned int size = 0;
        bool structContainsDouble = false;
        for (int member = 0; member < (int)type.getStruct()->size(); ++member) {
            TType memberType(type, member);
            // "... if applied to 
            // an aggregate containing a double, the offset must also be a multiple of 8, 
            // and the space taken in the buffer will be a multiple of 8."
            bool memberContainsDouble = false;
            int memberSize = computeTypeXfbSize(memberType, memberContainsDouble);
            if (memberContainsDouble) {
                structContainsDouble = true;
                RoundToPow2(size, 8);
            }
            size += memberSize;
        }

        if (structContainsDouble) {
            containsDouble = true;
            RoundToPow2(size, 8);
        }
        return size;
    }

    int numComponents;
    if (type.isScalar())
        numComponents = 1;
    else if (type.isVector())
        numComponents = type.getVectorSize();
    else if (type.isMatrix())
        numComponents = type.getMatrixCols() * type.getMatrixRows();
    else {
        assert(0);
        numComponents = 1;
    }

    if (type.getBasicType() == EbtDouble) {
        containsDouble = true;
        return 8 * numComponents;
    } else
        return 4 * numComponents;
}

// Return the size and alignment of a scalar.
// The size is returned in the 'size' parameter
// Return value is the alignment of the type.
int TIntermediate::getBaseAlignmentScalar(const TType& type, int& size)
{
    switch (type.getBasicType()) {
    case EbtInt64:
    case EbtUint64:
    case EbtDouble:  size = 8; return 8;
    default:         size = 4; return 4;
    }
}

TString DecorateUniform(const TString &string, const TType &type)
{
    if (type.getBasicType() == EbtSamplerExternalOES)
    {
        return "ex_" + string;
    }

    return Decorate(string);
}

TString DecorateUniform(const TName &name, const TType &type)
{
    if (type.getBasicType() == EbtSamplerExternalOES)
    {
        return "ex_" + name.getString();
    }

    return DecorateIfNeeded(name);
}

int UniformHLSL::declareUniformAndAssignRegister(const TType &type, const TString &name)
{
    int registerIndex = (IsSampler(type.getBasicType()) ? mSamplerRegister : mUniformRegister);

    declareUniformToList(type, name, registerIndex, &mActiveUniforms);

    unsigned int registerCount = HLSLVariableRegisterCount(mActiveUniforms.back(), mOutputType);

    if (IsSampler(type.getBasicType()))
    {
        mSamplerRegister += registerCount;
    }
    else
    {
        mUniformRegister += registerCount;
    }

    return registerIndex;
}