glGenSamplers, glBindSampler, glDeleteSamplers
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glIsSampler: man3/glIsSampler.xml
glIsSampler returns GL_TRUE if id is currently the name of a sampler object. If id is zero, or is a non-zero value that is not currently the name of a sampler object, or if an error occurs, glIsSampler returns GL_FALSE. A name returned by glGenSamplers, is the name of a sampler object.
glIsSampler is available only if the GL version is 3.3 or higher.