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12a5bf2e06
*** This is an API change *** The create_target() virtual function should return a CoglHandle to a texture; clutter_offscreen_effect_get_target(), instead, returns a CoglMaterial to be painted in the implementation of the paint_target() virtual function. Instead of equating textures with materials, and confusing the user of the API, we should mark the difference more prominently. First of all, we should return a CoglMaterial* (now that we have that as a public type) in get_target(); having handles all over the place does not make it easier to distinguish the semantics of the virtual functions. Then we should rename create_target() to create_texture(), to make it clear that what should be returned is a texture that is used as the backing for the offscreen framebuffer.