Function gl::GetTransformFeedbackVarying

pub unsafe fn GetTransformFeedbackVarying(
    program: GLuint,
    index: GLuint,
    bufSize: GLsizei,
    length: *mut GLsizei,
    size: *mut GLsizei,
    type_: *mut GLenum,
    name: *mut GLchar
)

Fallbacks: GetTransformFeedbackVaryingEXT