Most of the time that I'm drawing something, it is to create some resource which is used later on in the frame. For example, drawing the gbuffer, or a shadow map. Each time, you set a render target, draw things with a particular sort of shader, and then save the render target for use as a texture later.
I have encapsulated this within render "phases". Each phase defines a set of inputs an outputs. The renderer then topologically sorts all the phases, to ensure that resources have been created before a phase needs to use them as input. As a bonus, as the renderer knows when each resource is taken as input, it can work out when each resource is last used, and automatically mark the render target for re-use by a later phase.
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