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PowerVR Kyro II tweak guide

Application Profiles

The Kyro 1/2 Drivers allow you to create separate profiles for use with OpenGL/Direct3D Applications & Games (Many already have Profiles set in the Drivers). This is extremely useful as you may customize each of your games settings here for performance, compatibility, visual quality or a combination. This is the recommended way to customize Driver settings rather than changing the Global profile settings that will ignore the Custom Profiles.

To create a profile first select the 3D Optimisation tab then the appropriate API tab, i.e. OpenGL or Direct3D. Now select the Right arrow in the Profile section & select New.

In the Executable tab point to the location of the Game/Applications exe file, e.g. in the shot above that would be to where I have Operation Flashpoint installed. Click Ok once you have created a profile. Now using the Profile drop-down menu you can select what profile to assign settings to, with Global applying to everything, while selecting Operation Flashpoint, for example, will only apply any changes to that Game alone.

Fast mode Trilinear filtering

In conjunction with DXT1 texture compression the Kyro 1/2 uses a fast Trilinear texture filtering mode (As compared to the traditional mode of operation used when DXT1 is not in use). In this mode the lower detail Mipmap is auto-generated from the higher detail Mipmap, rather than getting the samples needed for it from the actual lower detail Mipmap. This reduces the need for the Kyro to access memory & as such improves performance even further than using texture compression alone does.

To test this out I used PowerVR's Villagemark benchmark test. Bilinear tests are included to give you a more complete indication of how the fast mode Trilinear filter improves performance.

 

Texture compression disabled

Texture compression enabled

Resolution

Bilinear

Trilinear

Bilinear

Trilinear

1024 x 768

130

69

134

132

The results need little explanation. With texture compression enabled the frame rate has slightly more than doubled using Trilinear texture filtering. While in the case of using Bilinear filtering there is only a minor frame rate improvement.

The screenshots beneath from Soldier Of Fortune illustrate the difference in image quality between Bilinear & Trilinear texture filtering.

Bilinear

Trilinear

As you can see, compared to the Bilinear filtered image, Trilinear texture filtering offers some greater texture detail in certain areas of the image, as well as smoother Mipmap transitions.

In conclusion the one recommendation I can strongly advise is to enable texture compression in Games if supported (Or force it via a Game profile) & similarly enable Trilinear texture filtering for your Games also (Again, force it via a Game profile if not an available choice in-game). This will yield improved image quality in Games & much improved performance. You should bear this information in mind when setting the options for Game/Application Profiles.

 



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