check before calling glClientActiveTexture
check before calling glClientActiveTexture

seandepagnier/glshim,lunixbochs/glshim,seandepagnier/glshim,RobertoMalatesta/glshim,lunixbochs/glshim,RobertoMalatesta/glshim,seandepagnier/glshim,RobertoMalatesta/glshim,RobertoMalatesta/glshim,lunixbochs/glshim,seandepagnier/glshim,lunixbochs/glshim