da_glTexSubImage3D

Undocumented in source but is binding to an external library. You might be able to learn more by searching the web for its name.
extern (System)
alias da_glTexSubImage3D = void function(GLenum, GLint, GLint, GLint, GLint, GLsizei, GLsizei, GLsizei, GLenum, GLenum, void*)

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