PFNGLINVALIDATETEXSUBIMAGEPROC

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C)
alias PFNGLINVALIDATETEXSUBIMAGEPROC = void function(GLuint texture, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth)

Meta