The symbolic mask constants and their associated GL client state are as follows (the second column lists which attributes are saved):
GL_CLIENT_PIXEL_STORE_BIT Pixel storage
GL_CLIENT_VERTEX_ARRAY_BIT Vertex arrays (and enables)
glPopClientAttrib restores the values of the client-state variables saved with the last glPushClientAttrib. Those not saved are left unchanged.
It is an error to push attributes onto a full client attribute stack, or to pop attributes off an empty stack. In either case, the error flag is set, and no other change is made to GL state.
Initially, the client attribute stack is empty.
Not all values for GL client state can be saved on the attribute stack. For example, select and feedback state cannot be saved.
The depth of the attribute stack depends on the implementation, but it must be at least 16.
Use glPushAttrib and glPopAttrib to push and restore state which is kept on the server. Only pixel storage modes and vertex array state may be pushed and popped with glPushClientAttrib and glPopClientAttrib.
When the GL_ARB_multitexture extension is supported, pushing and popping client vertex array state apples to all supported texture units, and the active client texture state.
GL_STACK_UNDERFLOW is generated if glPopClientAttrib is called while the attribute stack is empty.
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