Method createTextureCall

SPIRV/SpvBuilder.cpp:3772–3989

Accept all parameters needed to create a texture instruction. Create the correct instruction based on the inputs, and make the call.

// Accept all parameters needed to create a texture instruction.
// Create the correct instruction based on the inputs, and make the call.
Id Builder::createTextureCall(Decoration precision, Id resultType, bool sparse, bool fetch, bool proj, bool gather,
    bool noImplicitLod, const TextureParameters& parameters, ImageOperandsMask signExtensionMask)
{
    std::vector<Id> texArgs;

    //
    // Set up the fixed arguments
    //
    bool explicitLod = false;
    texArgs.push_back(parameters.sampler);
    texArgs.push_back(parameters.coords);
    if (parameters.Dref != NoResult)
        texArgs.push_back(parameters.Dref);
    if (parameters.component != NoResult)
        texArgs.push_back(parameters.component);

    if (parameters.granularity != NoResult)
        texArgs.push_back(parameters.granularity);
    if (parameters.coarse != NoResult)
        texArgs.push_back(parameters.coarse);

    //
    // Set up the optional arguments
    //
    size_t optArgNum = texArgs.size(); // the position of the mask for the optional arguments, if any.
    ImageOperandsMask mask = ImageOperandsMask::MaskNone; // the mask operand
    if (parameters.bias) {
        mask = (ImageOperandsMask)(mask | ImageOperandsMask::Bias);
        texArgs.push_back(parameters.bias);
    }
    if (parameters.lod) {
        mask = (ImageOperandsMask)(mask | ImageOperandsMask::Lod);
        texArgs.push_back(parameters.lod);
        explicitLod = true;
    } else if (parameters.gradX) {
        mask = (ImageOperandsMask)(mask | ImageOperandsMask::Grad);
        texArgs.push_back(parameters.gradX);
        texArgs.push_back(parameters.gradY);
        explicitLod = true;
    } else if (noImplicitLod && ! fetch && ! gather) {
        // have to explicitly use lod of 0 if not allowed to have them be implicit, and
        // we would otherwise be about to issue an implicit instruction
        mask = (ImageOperandsMask)(mask | ImageOperandsMask::Lod);
        texArgs.push_back(makeFloatConstant(0.0));
        explicitLod = true;
    }
    if (parameters.offset) {
        if (isConstant(parameters.offset))
            mask = (ImageOperandsMask)(mask | ImageOperandsMask::ConstOffset);
        else {
            addCapability(Capability::ImageGatherExtended);
            mask = (ImageOperandsMask)(mask | ImageOperandsMask::Offset);
        }
        texArgs.push_back(parameters.offset);
    }
    if (parameters.offsets) {
        if (!isConstant(parameters.offsets) && sourceLang == spv::SourceLanguage::GLSL) {
            mask = (ImageOperandsMask)(mask | ImageOperandsMask::Offsets);