glGenFramebuffers.3G man page
glGenFramebuffers — generate framebuffer object names
void glGenFramebuffers(GLsizei n, GLuint *ids);
Specifies the number of framebuffer object names to generate.
Specifies an array in which the generated framebuffer object names are stored.
glGenFramebuffers returns n framebuffer object names in ids. 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 glGenFramebuffers.
Framebuffer object names returned by a call to glGenFramebuffers are not returned by subsequent calls, unless they are first deleted with glDeleteFramebuffers().
The names returned in ids are marked as used, for the purposes of glGenFramebuffers 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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