glIsTexture — determine if a name corresponds to a texture
texture is currently the name of a texture.
texture is zero, or is a non-zero value that is not currently the
name of a texture, or if an error occurs,
A name returned by glGenTextures, but not yet associated with a texture by calling glBindTexture, is not the name of a texture.
glBindTexture, glCopyTexImage1D, glCopyTexImage2D, glDeleteTextures, glGenTextures, glGet, glGetTexParameter, glTexImage1D, glTexImage2D, glTexImage3D, glTexParameter
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