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[core] Split layer type specific code in mbgl::Programs #13577
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kkaefer
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src/mbgl/programs/programs.cpp
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| property = std::make_unique<ProgramsType>(context, programParameters); \ | ||
| } \ | ||
| return static_cast<ProgramsType&>(*property); \ | ||
| } |
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We try to use as little macros as possible. While the macro is a bit shorter, writing out all functions verbatim doesn't look like it'd be too much code either.
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OK, will remove it
| std::unique_ptr<LayerTypePrograms> fillPrograms; | ||
| std::unique_ptr<LayerTypePrograms> fillExtrusionPrograms; | ||
| std::unique_ptr<LayerTypePrograms> linePrograms; | ||
| std::unique_ptr<LayerTypePrograms> symbolPrograms; |
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Why do we need an abstract base class here?
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unique_ptr requires a destructor defined, so pointers to the concrete classes would prevent from LTO removing them from the binaries.
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@kkaefer thanks for your comments! addressed in the latest patch |
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@alexshalamov @tmpsantos Could you also take a look? |
Progams code for a certain layer type is encapsulted within a dedicated `<layer type>Programs` class, inherited from the generic base `LayerTypePrograms` class. `mbgl::Programs::get<layer type>Programs()` lazily initializes the layer type-specific programs code using pointer to the base class, which allows LTO to remove this code from binaries (if the corresponding `get<layer type>Programs()` method can never be invoked).
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alexshalamov
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Jan 11, 2019
kkaefer
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Jan 11, 2019
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Programs code for a certain layer type is encapsulated within
a dedicated
<layer type>Programsclass, inherited fromthe generic base
LayerTypeProgramsclass.mbgl::Programs::get<layer type>Programs()lazily initializes thelayer type-specific programs code using pointer to the base class,
which allows LTO to remove this code from binaries (if the corresponding
get<layer type>Programs()method can never be invoked).Tagging #13276