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#pragma once
#include <mbgl/map/map_observer.hpp>
#include <memory>
namespace mbgl {
namespace gl {
class Context;
} // namespace gl
class BackendScope;
class Backend : public MapObserver {
public:
Backend();
virtual ~Backend();
// Returns the backend's context which manages OpenGL state.
gl::Context& getContext();
// Called when the map needs to be rendered; the backend should call Map::render() at some point
// in the near future. (Not called for Map::renderStill() mode.)
virtual void invalidate() = 0;
protected:
// Called when the backend's GL context needs to be made active or inactive. These are called,
// as a matched pair, in four situations:
//
// 1. When releasing GL resources during Map destruction
// 2. When calling a CustomLayerInitializeFunction, during Map::addLayer
// 3. When calling a CustomLayerDeinitializeFunction, during Map::removeLayer
// 4. When rendering for Map::renderStill
//
// They are *not* called for Map::render; it is assumed that the correct context is already
// activated prior to calling Map::render.
virtual void activate() = 0;
virtual void deactivate() = 0;
std::unique_ptr<gl::Context> context;
friend class BackendScope;
};
} // namespace mbgl
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