At Siggraph conference last year, one of the DICE rendering architect, Johan Andresson, talks about the five biggest challenges in real-time rendering - he also claimed that in order to obtain the cinematic image quality, Order-Independent Transparency (OIT) is a must. Unfortunately, despite the OIT has no DirectX 11 API since its inception, there has been no games that utilize this technology. This technology is not used because when used effectively it will have a negative impact on the performance of the GPU. AMD made a Mecha DX11 demo when it was first introduced to show how the OIT can work on their hardware HD 5000. While this can work, when OIT apparently ignited direct performance dropped to 70 percent slower. None of the players who will want to enjoy the beautiful transparent effects while sacrificing their overall system performance.
Everything is transparent, including glasses, hair, trees, smoke, and water - all the things that we often find in modern games. Normally, they be rendered using the "estimate cheesy and sleazy," said Huddy - which would make it difficult for the artist. It also triggers a state in which the programmer must be able to control the pixels in an exceptional environment detail, and this will make the programmer's back to the artist and said, 'You can not make this stuff up, because the graphics card will not render mempu it '.
Haswell Heights
But Haswell was designed to meet the OIT, which means when your PC is visualization, pixel sequence will not be a problem and Transparency will be able to work well without the negative effects on the overall system performance. Intel has been working with The Creative Assembly and Codemasters - in GRID 2 and Rome 2 - to implement new features in their latest game titles. The second game will be using OIT and PixelSync, which allows Haswell to show a realistic transparency effects with minimal impact on performance. By using the GRID 2 as an example, Huddy explains that this game can run smoothly with the frame rate of around 40-50fps with Haswell - and when OIT is lit, the overall system performance is only decreased about 10 percent only.OIT standards DX11 technology is now used in Rome 2, but Huddy thought to eliminate them at the time of launch: "If you use additional graphics card for Intel fight, we will win," he explained. "If you turn on the OIT, we will win because we can perform these operations with minimal impact on system performance - we know how to align pixels. It can not be done by high-end graphics card though. It would be very embarrassing to have a graphics card for $ 400 or more but can not work perfectly handle transparency as Haswell. "
Unfortunately, PixelSync technology can only be used when Haswell chips are used exclusively for graphic needs. For now, there is no other way to load the graphics card to allocate Haswell OIT to do the job while it is rendering. "Unfortunately the way DirectX works is by using one chip. We can not do much - additional graphics card should work on their own, "said Huddy. "This problem will not be solved until they change their architecture.
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