Wrap IMVU's Direct3D renderer in the pass-through

IMVU's OpenGL renderer needs a real graphics driver; Direct3D also runs on Windows' basic display driver and is what most players use. The log can now be read while the client runs. Verified in rooms: every call goes through.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

include/t5de/imvu/render_engine.hpp

@@ -112,4 +112,16 @@ static_assert(sizeof(PiRenderEngine) == 12, "vtable pointer, magic, size");
 using IsRenderEngineSupported = int(__cdecl*)();
 using CreateRenderEngine = SharedPtr<PiRenderEngine>(__cdecl*)(SharedPtr<INativeWindow> window);
 
+// The renderers SceneWindow.dll's createRenderer makes (values from _avatarwindow.pyd's RendererType).
+enum class RendererType : int {
+    Direct3D = 1,    // RenderEngineDx, Direct3D 9
+    OpenGL = 2,      // the plugin glRenderEngine.dll
+    SwiftShader = 9, // RenderEngineDx on swiftshader.dll
+};
+
+// SceneWindow.dll's createRenderer(boost::shared_ptr<INativeWindow>, RendererType), exported by this name.
+using CreateRenderer = SharedPtr<PiRenderEngine>(__cdecl*)(SharedPtr<INativeWindow> window, RendererType type);
+inline constexpr const char* createRendererName =
+    "?createRenderer@@YA?AV?$shared_ptr@VPiRenderEngine@@@boost@@V?$shared_ptr@VINativeWindow@@@2@W4RendererType@@@Z";
+
 } // namespace t5de::imvu