vocationARB(vec4);int   readFirstInvocationARB(int);ivec2 readFirstInvocationARB(ivec2);ivec3 readFirstInvocationARB(ivec3);ivec4 readFirstInvocationARB(ivec4);uint  readFirstInvocationARB(uint);uvec2 readFirstInvocationARB(uvec2);uvec3 readFirstInvocationARB(uvec3);uvec4 readFirstInvocationARB(uvec4);