Add Os Bridge into test framework

tests/gfx/include/os/desktopos.hpp

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+#pragma once
+
+#include <os-ctx.hpp>
+
+namespace PD {
+class DesktopOS : public PD::OsCtx {
+ public:
+  DesktopOS(Driver d = Driver::OpenGL3) : PD::OsCtx(d) {}
+  ~DesktopOS() {}
+
+  void Init() override;
+  void Deinit() override;
+  bool Mainloop() override;
+  void ClearViewPort() override;
+  void SwapBuffers() override;
+
+ private:
+  struct Impl;
+  Impl* impl = nullptr;
+};
+}  // namespace PD

tests/gfx/include/os/horizon-ctr.hpp

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+#pragma once
+
+#include <os-ctx.hpp>
+
+namespace PD {
+class HorizonCtr : public PD::OsCtx {
+ public:
+  HorizonCtr(Driver d = Driver::Citro3D) : PD::OsCtx(d) {}
+  ~HorizonCtr() {}
+
+  void Init() override;
+  void Deinit() override;
+  bool Mainloop() override;
+  void ClearViewPort() override;
+  void SwapBuffers() override;
+
+ private:
+  struct Impl;
+  Impl* impl = nullptr;
+};
+}  // namespace PD

tests/gfx/include/os/horizon-nx.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <os-ctx.hpp>
+
+namespace PD {
+class HorizonNX : public PD::OsCtx {
+ public:
+  HorizonNX(Driver d = Driver::OpenGL3) : PD::OsCtx(d) {}
+  ~HorizonNX() {}
+
+  void Init() override;
+  void Deinit() override;
+  bool Mainloop() override;
+  void ClearViewPort() override;
+  void SwapBuffers() override;
+
+ private:
+  struct Impl;
+  Impl* impl = nullptr;
+};
+}  // namespace PD