core: remove unused Metal RendererBackend state-cache methods (#4519)

include/mln/mtl/renderer_backend.hpp

@@ -17,16 +17,12 @@ class ProgramParameters;
 namespace mtl {
 
 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 MetalMetal  state.
-    virtual void updateAssumedState() = 0;
-
     /// One-time shader initialization
     void initShaders(gfx::ShaderRegistry&, const ProgramParameters& programParameters) override;
 
@@ -40,26 +36,6 @@ protected:
     /// 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 the Metal 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 a Metal 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);
-
-protected:
     MTLDevicePtr device;
     MTLCommandQueuePtr commandQueue;
     bool baseVertexInstanceDrawingSupported = false;