78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
#pragma once
|
|
|
|
#include <mbgl/util/util.hpp>
|
|
|
|
#include <memory>
|
|
#include <mutex>
|
|
|
|
namespace mbgl {
|
|
namespace gfx {
|
|
|
|
class BackendScope;
|
|
class Context;
|
|
class Renderable;
|
|
class ShaderRegistry;
|
|
|
|
// We can make some optimizations if we know that the drawing context is not shared with other code.
|
|
enum class ContextMode : bool {
|
|
Unique,
|
|
Shared,
|
|
};
|
|
|
|
class RendererBackend {
|
|
protected:
|
|
explicit RendererBackend(ContextMode);
|
|
|
|
public:
|
|
virtual ~RendererBackend();
|
|
RendererBackend(const RendererBackend&) = delete;
|
|
RendererBackend& operator=(const RendererBackend&) = delete;
|
|
|
|
/// Returns the device's context.
|
|
Context& getContext();
|
|
|
|
template <typename T>
|
|
T& getContext() {
|
|
return static_cast<T&>(getContext());
|
|
}
|
|
|
|
bool contextIsShared() const { return contextMode == ContextMode::Shared; }
|
|
|
|
/// Returns a reference to the default surface that should be rendered on.
|
|
virtual Renderable& getDefaultRenderable() = 0;
|
|
|
|
/// One-time shader initialization
|
|
virtual void initShaders(gfx::ShaderRegistry&) = 0;
|
|
|
|
protected:
|
|
virtual std::unique_ptr<Context> createContext() = 0;
|
|
|
|
/// Called when the backend's GL context needs to be made active or
|
|
/// inactive. These are called, as a matched pair, exclusively through
|
|
/// BackendScope, in two situations:
|
|
///
|
|
/// 1. When releasing GL resources during Renderer destruction
|
|
/// (Including calling CustomLayerHost::deinitialize during
|
|
/// RenderCustomLayer destruction)
|
|
/// 2. When renderering through Renderer::render()
|
|
/// (Including calling CustomLayerHost::initialize for newly added
|
|
/// custom layers and
|
|
/// CustomLayerHost::deinitialize on layer removal)
|
|
virtual void activate() = 0;
|
|
virtual void deactivate() = 0;
|
|
|
|
protected:
|
|
std::unique_ptr<Context> context;
|
|
const ContextMode contextMode;
|
|
std::once_flag initialized;
|
|
|
|
friend class BackendScope;
|
|
};
|
|
|
|
MBGL_CONSTEXPR bool operator==(const RendererBackend& a, const RendererBackend& b) {
|
|
return &a == &b;
|
|
}
|
|
|
|
} // namespace gfx
|
|
} // namespace mbgl
|