Function gl::DrawElementsInstancedBaseVertex

pub unsafe fn DrawElementsInstancedBaseVertex(
    mode: GLenum, 
    count: GLsizei, 
    type_: GLenum, 
    indices: *const c_void, 
    instancecount: GLsizei, 
    basevertex: GLint
)

Fallbacks: DrawElementsInstancedBaseVertexEXT, DrawElementsInstancedBaseVertexOES