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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;
// Called prior to rendering to update the internally assumed OpenGL state.
virtual void updateAssumedState() = 0;
protected:
std::unique_ptr<gfx::Context> createContext() override;
// Called with the name of an OpenGL extension that should be loaded. RendererBackend implementations
// must call the API-specific version that obtains the function pointer for this function,
// or a null pointer if unsupported/unavailable.
virtual ProcAddress getExtensionFunctionPointer(const char*) = 0;
// Reads the color pixel data from the currently bound framebuffer.
PremultipliedImage readFramebuffer(const Size&);
// A constant to signal that a framebuffer is bound, but with an unknown ID.
static constexpr const FramebufferID ImplicitFramebufferBinding =
std::numeric_limits<FramebufferID>::max();
// Tells the renderer that OpenGL state has already been set by the windowing toolkit.
// It sets the internal assumed state to the supplied values.
void assumeFramebufferBinding(FramebufferID fbo);
void assumeViewport(int32_t x, int32_t y, const Size&);
void assumeScissorTest(bool);
// Returns true when assumed framebuffer binding hasn't changed from the implicit binding.
bool implicitFramebufferBound();
public:
// Triggers an OpenGL state update if the internal assumed state doesn't match the
// supplied values.
void setFramebufferBinding(FramebufferID fbo);
void setViewport(int32_t x, int32_t y, const Size&);
void setScissorTest(bool);
};
} // namespace gl
} // namespace mbgl
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