| 1 | #pragma once |
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| 2 | |
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| 3 | namespace mbgl { |
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| 4 | |
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| 5 | class RendererBackend; |
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| 6 | |
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| 7 | class BackendScope { |
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| 8 | public: |
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| 9 | // There are two types of scopes: Creating an "Implicit" scope tells Mapbox GL that the |
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| 10 | // supporting windowing system has already activated the GL Backend and that no further actions |
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| 11 | // are required. Creating an "Explicit" scope actually enables the GL Backend, and disables it |
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| 12 | // when the BackendScope is destroyed. |
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| 13 | enum class ScopeType : bool { |
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| 14 | Implicit, |
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| 15 | Explicit, |
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| 16 | }; |
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| 17 | |
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| 18 | BackendScope(RendererBackend&, ScopeType = ScopeType::Explicit); |
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| 19 | ~BackendScope(); |
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| 20 | |
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| 21 | // Returns true when there is currently a BackendScope active in this thread. |
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| 22 | static bool exists(); |
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| 23 | |
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| 24 | private: |
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| 25 | void activate(); |
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| 26 | void deactivate(); |
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| 27 | |
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| 28 | BackendScope* priorScope; |
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| 29 | BackendScope* nextScope; |
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| 30 | RendererBackend& backend; |
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| 31 | const ScopeType scopeType; |
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| 32 | bool activated = false; |
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| 33 | }; |
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| 34 | |
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| 35 | } // namespace mbgl |
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| 36 | |
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