Framebuffer Objects - Praise for OpenGL ES 30 Programming Guide - page 333

The renderbuffer object can be attached to the color, depth, or stencil
attachment of the framebuffer object without the renderbuffer's storage
format and dimensions being specified. The renderbuffer's storage format
and dimensions can be specified before or after the renderbuffer object
has been attached to the framebuffer object. This information will,
however, need to be correctly specified before the framebuffer object and
renderbuffer attachment can be used for rendering.

Multisample Renderbuffers

Multisample renderbuffers enable the application to render to off-
screen framebuffers with multisample anti-aliasing. The multisample
renderbuffers cannot be directly bound to textures, but they can be
resolved to single-sample textures using the newly introduced framebuffer
blit (described later in this chapter).

As described in the previous section, to create a multisample renderbuffer,
you use the glRenderbufferStorageMultisample API.

Renderbuffer Formats

Table 12-1 lists the renderbuffer formats to store a color-renderable buffer,
and Table 12-2 lists the renderbuffer formats to store a depth-renderable or
stencil-renderable buffer.

Table 12-1 Renderbuffer Formats for Color-Renderable Buffer

Internal Format Red Bits Green Bits Blue Bits Alpha Bits

GL_R8 8 — — —

GL_R8UI ui8 — — —

GL_R8I i8 — — —

GL_R16UI ui16 — — —

GL_R16I i16 — — —

GL_R32UI ui32 — — —

GL_R32I i32 — — —

(continues)