glGenRenderbuffers.3G man page
glGenRenderbuffers — generate renderbuffer object names
void glGenRenderbuffers(GLsizei n, GLuint *renderbuffers);
Specifies the number of renderbuffer object names to generate.
Specifies an array in which the generated renderbuffer object names are stored.
glGenRenderbuffers returns n renderbuffer object names in renderbuffers. There is no guarantee that the names form a contiguous set of integers; however, it is guaranteed that none of the returned names was in use immediately before the call to glGenRenderbuffers.
Renderbuffer object names returned by a call to glGenRenderbuffers are not returned by subsequent calls, unless they are first deleted with glDeleteRenderbuffers().
The names returned in renderbuffers are marked as used, for the purposes of glGenRenderbuffers only, but they acquire state and type only when they are first bound.
GL_INVALID_VALUE is generated if n is negative.
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