Method createTextureQueryCall

SPIRV/SpvBuilder.cpp:3992–4053

Comments in header

// Comments in header
Id Builder::createTextureQueryCall(Op opCode, const TextureParameters& parameters, bool isUnsignedResult)
{
    // Figure out the result type
    Id resultType = 0;
    switch (opCode) {
    case Op::OpImageQuerySize:
    case Op::OpImageQuerySizeLod:
    {
        int numComponents = 0;
        switch (getTypeDimensionality(getImageType(parameters.sampler))) {
        case Dim::Dim1D:
        case Dim::Buffer:
            numComponents = 1;
            break;
        case Dim::Dim2D:
        case Dim::Cube:
        case Dim::Rect:
        case Dim::SubpassData:
            numComponents = 2;
            break;
        case Dim::Dim3D:
            numComponents = 3;
            break;

        default:
            assert(0);
            break;
        }
        if (isArrayedImageType(getImageType(parameters.sampler)))
            ++numComponents;

        Id intType = isUnsignedResult ? makeUintType(32) : makeIntType(32);
        if (numComponents == 1)
            resultType = intType;
        else
            resultType = makeVectorType(intType, numComponents);

        break;
    }
    case Op::OpImageQueryLod:
        resultType = makeVectorType(getScalarTypeId(getTypeId(parameters.coords)), 2);
        break;
    case Op::OpImageQueryLevels:
    case Op::OpImageQuerySamples:
        resultType = isUnsignedResult ? makeUintType(32) : makeIntType(32);
        break;
    default:
        assert(0);
        break;
    }

    Instruction* query = new Instruction(getUniqueId(), resultType, opCode);
    query->addIdOperand(parameters.sampler);
    if (parameters.coords)
        query->addIdOperand(parameters.coords);
    if (parameters.lod)
        query->addIdOperand(parameters.lod);
    addInstruction(std::unique_ptr<Instruction>(query));