[ ?? ] ????software rendER

tomb4

????????????????

mipmap?? l = min(p(x), p(y))
???????? max( anisotropy, p(x)/p(y) ).

??????????????????????anisotropic filter???2x8?texel??filter kernel???anisotropic?mipmap layer?????????????????????????????????????????fragment??????ddu?ddv?????????????????????????????????????
w-buffer?????????????????????????????32bit?w-buffer?????????????????????????????????????z-buffer????????????????????0??????1?z-buffer?????????????????????????z-buffer??????????????????z-buffer??????��

filter kernel???????????AF???????

z-buffer?????????

hourousha

1?filter kernel??????????texel??????4xaf??2x8?texels????fragment????
2????????????????????0-1???????????????

tomb4

filter kernel??????????texel??????4xaf??2x8?texels????fragment????

???????????????
???4xaf???????af??ddu!=ddv ??? p(x) !=p(y)???????????af?????????????????????????mipmap????????texel block????????????

hourousha

??????????????????af????mipmap????????????????????af??????mipmap layer??texel????????
????????????????????GPU???????mipmap-filter?min/mag texel filter?????mipmap filter???????point?????linear?mipmap layer??????ATI?8500????point mipmap filter AF??????ATI/NV?bri-linear filter AF?????????GPU??af?mipmap filter?????????????af?bilinear filter????????

?????????????????fragment???????????u,v????????????texel space??????????u',v'???????point ???????????texel??????????????nearest????1 tap????????????4?texel??????????4-taps bilinear?
?mipmap?????????fragment????texel???????????????mip-map chain????layer?????????????1/2???mipmap??????box filter????????????4 texels????????texels????????????????????????????????
???????tri-linear???????????fragment???texels?????u??1.6?0?texel?v??3.2?0?texel???????????mip???????layer2?mipmap layer??bilinear??????????????mip???????????1???2???4-taps bilinear?????????mipmap weight?0.6??????????????????????????3?linear??????tri-linear??????trilinear?????taps???
??????????u,v??????mipmap?????????????????????????
?af????????????????????2xaf?????0??????????2x4= 8taps texels?????????mipmap??(0.6)?????????????????????taps??2x4x2=16 taps??trilinear??????????4xaf?????32 taps?8xaf??64 taps?
?trilinear????????af?mipmap???????uv??????mipmap?????????????????????
?????colored mipmap??????mipmap???????????????????????mipmap?????trilinear??????????????????mipmap???????3dmark?3danalyzer??????
??????????????2xn?texel ?????filter???????bilinear??????2x2?taps????2x4,2x8???taps?

tomb4

?????????????????????

????????????af?filter??????????
????????anisotropy line????????sampling point.??????mipmap?2*n?tap?????????2*2?bilinear???????2xaf?4xaf???anisotropy line???????????2,4????????filter,?????filter??????????point,bilinear,trilinear???

hourousha

????2x2 taps??????????????????
???????4xaf???????????mipmap layer???2x8 taps filter??????fragment???2x8??????ddu/ddv???????????????af???

kypck

I agree with hourousha.
AF applies only to bilinear & trilinear filtering, it makes no sense with nearest filtering.
The algorithm of AF, I think, depends on hardware implementations, some hardware may not be able to to AF at any direction, such as R200.

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OSFG

???3D?????????????????????