Add some renderer related helper functions in emulator and renderergl

include/renderer_gl/renderer_gl.hpp

@@ -84,6 +84,10 @@ class RendererGL final : public Renderer {
 
 	std::optional<ColourBuffer> getColourBuffer(u32 addr, PICA::ColorFmt format, u32 width, u32 height, bool createIfnotFound = true);
 
+	// Note: The caller is responsible for deleting the currently bound FBO before calling this
+	void setFBO(uint handle) { screenFramebuffer.m_handle = handle; }
+	void resetStateManager() { gl.reset(); }
+
 #ifdef PANDA3DS_FRONTEND_QT
 	virtual void initGraphicsContext([[maybe_unused]] GL::Context* context) override { initGraphicsContextInternal(); }
 #endif