RD3D Renderer Wrapper

[rajkosto]

So around the 25th I was taking screenshots of heads, torsos and other things to make note of what the faces/etc look like, but what was bothering me was the ugly, ugly "face shading" bug that has been with us since the release of Vista. So I decided to take matters into my own hands and eliminate it, once and for all.

From now on, if you use any of the launchers I have created, your MXO will automatically be patched to include my renderer wrapper, which will act as a translator between MXO and the Direct3D9 runtime, eliminating those outdated FFP rendering cals and replacing them with new, on the fly generated vertex-shaders, which is how all current games do animation and lighting nowadays.

Since I have invested a lot of time into this renderer (nearly all my waking hours since 25th dec untill now), it is accurate, and all effects and states that MXO uses should render 100% like they used to, only now there will be no bugs like infinite texture coords when using shadows, "one color" screens when there's too many environment-mapped objects on the screen (like around the Uriah HW), and all models, regardless of their skinning method, will be lit uniformly, so there will be no more "shading bugs".

The one downside of having to emulate the whole vertex FFP from D3D9 is that it makes a lot of shader combinations, and since they are generated on the fly, the first time MXO renders something, you will notice intermitted second (or longer, depending on how many new shaders are being generated) stutters during playing. This will only happen untill all of the shaders have been generated and stored, and after that, the game should play smooth.

However, since modern graphics cards weren't designed to switch vertex shaders every 5 draw calls or so, there's a significant performance decrease during normal play as well, in the form of lower FPS. However, since most of us have rigs that can play MXO at 200 FPS or more, this should not be a significant problem (the FPS is about 25% lower, but the performance difference is smaller if there are many models on screen, as VS does skinning all in hardware, while the old method did it in software, so with like 20 NPCs on screen, the performance hit is only 12%). The game is still perfectly playable even on my laptop, at maximum settings, on which i have developed the renderer.

If you have a very old card (like one that doesn't support Shader Model 2), this renderer will not even activate, and MXO will render as it always has, using FFP. People with such cards cannot use the Vista driver model and up drivers anyway, and shouldn't have the bugs in the first place.

However, if you have a more recent card, but very low power, and the FPS hit is just too much for you, you may opt-out of using this new renderer by making a new text document called rd3d_disable.txt (contents of this file are not important) and placing it in the same directory that MXO is installed in (next to rd3d9.dll). This will make the new renderer not activate at all, and MXO will work just as before.

I plan on continuously updating this piece of software, adding new features such as enabling AA while windowed, better overbrights and shadows, possible SSAO inclusion, etc. when I get some free time after the exams.

Hope you enjoy this, and happy holidays (in my country, Christmas came just today)

Discussion and troubleshooting at http://mxoemu.info/forum/thread-904.html