renderer_backend.hpp

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#pragma once
 
#include <mbgl/gfx/renderer_backend.hpp>
#include <mbgl/util/image.hpp>
#include <mbgl/util/size.hpp>
#include <mbgl/util/util.hpp>
 
namespace mbgl {
namespace gl {
 
using ProcAddress = void (*)();
using FramebufferID = uint32_t;
 
class RendererBackend : public gfx::RendererBackend {
public:
    RendererBackend(gfx::ContextMode);
    ~RendererBackend() override;
 
    virtual void updateAssumedState() = 0;
 
protected:
    std::unique_ptr<gfx::Context> createContext() override;
 
    virtual ProcAddress getExtensionFunctionPointer(const char*) = 0;
 
    PremultipliedImage readFramebuffer(const Size&);
 
    static constexpr const FramebufferID ImplicitFramebufferBinding =
        std::numeric_limits<FramebufferID>::max();
 
    void assumeFramebufferBinding(FramebufferID fbo);
    void assumeViewport(int32_t x, int32_t y, const Size&);
    void assumeScissorTest(bool);
 
    bool implicitFramebufferBound();
 
public:
    void setFramebufferBinding(FramebufferID fbo);
    void setViewport(int32_t x, int32_t y, const Size&);
    void setScissorTest(bool);
};
 
} // namespace gl
} // namespace mbgl