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README.ViRGE
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2001-10-30
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Limitations of the ViRGE chip:
The S3 ViRGE driver has a few limitations that are a result of the limitations
of the chip itself, or are a result of insufficient documentation:
- Texture wrapping cannot be disabled in the current driver version. It is
uncertain whether this is a feature of the chip or not.
- Most of the alpha blending modes are not supported. There is no
source or destination function, and only texture values can be used
for transparency.
- There is no difference between magnification and minification filtering.
Filtering of textures is for magnification, mipmapping for minification.
Trilinear filtering is possible, though.
- Only linear interpolated fogging is available. All other modes are rejected.
You may override this with the variable Warp3D/ViRGE/Fog. If set to "linear",
linear fog is accepted. If set to "all", all fogging is accepted. All other
values only allow interploated fog.
For more details, refer to docs/Warp3D_User.guide.