OpenGL Programming Guide: The Official Guide to Learning OpenGL, Version 4.3, Eighth Edition

Creating Renderbuffer Storage

When you first call glBindRenderbuffer() with an unused renderbuffer name, the OpenGL server creates a renderbuffer with all its state information set to the default values. In this configuration, no storage has been allocated to store image data. Before you can attach a renderbuffer to a framebuffer and render into it, you need to allocate storage and specify its image format. This is done by calling either glRenderbufferStorage() or glRenderbufferStorageMultisample().

void glRenderbufferStorage(GLenum target,                         GLenum internalformat,                         GLsizei width, GLsizei height);void glRenderbufferStorageMultisample(GLenum target,                         GLsizei samples,                         GLenum ...