Method addSamplingFunctions

glslang/MachineIndependent/Initialize.cpp:7860–8120

Helper function for add2ndGenerationSamplingImaging(), when adding context-independent built-in functions. Add all the texture lookup functions for the given type.

// Add all the texture lookup functions for the given type.
//
void TBuiltIns::addSamplingFunctions(TSampler sampler, const TString& typeName, int version, EProfile profile)
{
    //
    // texturing
    //
    for (int proj = 0; proj <= 1; ++proj) { // loop over "bool" projective or not

        if (proj && (sampler.dim == EsdCube || sampler.isBuffer() || sampler.arrayed || sampler.isMultiSample()
            || !sampler.isCombined()))
            continue;

        for (int lod = 0; lod <= 1; ++lod) {

            if (lod && (sampler.isBuffer() || sampler.isRect() || sampler.isMultiSample() || !sampler.isCombined()))
                continue;
            if (lod && sampler.dim == Esd2D && sampler.arrayed && sampler.shadow)
                continue;
            if (lod && sampler.dim == EsdCube && sampler.shadow)
                continue;

            for (int bias = 0; bias <= 1; ++bias) {

                if (bias && (lod || sampler.isMultiSample() || !sampler.isCombined()))
                    continue;
                if (bias && (sampler.dim == Esd2D || sampler.dim == EsdCube) && sampler.shadow && sampler.arrayed)
                    continue;
                if (bias && (sampler.isRect() || sampler.isBuffer()))
                    continue;

                for (int offset = 0; offset <= 1; ++offset) { // loop over "bool" offset or not

                    if (proj + offset + bias + lod > 3)
                        continue;
                    if (offset && (sampler.dim == EsdCube || sampler.isBuffer() || sampler.isMultiSample()))
                        continue;

                    for (int fetch = 0; fetch <= 1; ++fetch) { // loop over "bool" fetch or not

                        if (proj + offset + fetch + bias + lod > 3)
                            continue;
                        if (fetch && (lod || bias))
                            continue;
                        if (fetch && (sampler.shadow || sampler.dim == EsdCube))
                            continue;
                        if (fetch == 0 && (sampler.isMultiSample() || sampler.isBuffer()
                            || !sampler.isCombined()))
                            continue;

                        for (int grad = 0; grad <= 1; ++grad) { // loop over "bool" grad or not

                            if (grad && (lod || bias || sampler.isMultiSample() || !sampler.isCombined()))
                                continue;
                            if (grad && sampler.isBuffer())
                                continue;
                            if (proj + offset + fetch + grad + bias + lod > 3)
                                continue;

                            for (int extraProj = 0; extraProj <= 1; ++extraProj) {