733661948c
- Guards against duplicate activations by checking wether the backend of the prior scope is the same as the current ones - Makes sure that only the most outer backend scope deactivates by tracking activation state
36 lines
899 B
C++
36 lines
899 B
C++
#pragma once
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namespace mbgl {
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class Backend;
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class BackendScope {
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public:
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// There are two types of scopes: Creating an "Implicit" scope tells Mapbox GL that the
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// supporting windowing system has already activated the GL Backend and that no further actions
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// are required. Creating an "Explicit" scope actually enables the GL Backend, and disables it
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// when the BackendScope is destroyed.
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enum class ScopeType : bool {
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Implicit,
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Explicit,
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};
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BackendScope(Backend&, ScopeType = ScopeType::Explicit);
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~BackendScope();
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// Returns true when there is currently a BackendScope active in this thread.
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static bool exists();
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private:
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void activate();
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void deactivate();
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BackendScope* priorScope;
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BackendScope* nextScope;
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Backend& backend;
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const ScopeType scopeType;
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bool activated = false;
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};
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} // namespace mbgl
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