MTLLanguageVersion.version2_1 Version 2.1 of the Metal shading language. Declarationcase version2_1 See AlsoVersion numbersMTLLanguageVersion.version1_1MTLLanguageVersion.version1_2MTLLanguageVersion.version2_0MTLLanguageVersion.version2_2MTLLanguageVersion.version2_3MTLLanguageVersion.version2_4MTLLanguageVersion.version3_0MTLLanguageVersion.version3_1MTLLanguageVersion.version3_2MTLLanguageVersion.version1_0