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11-Sep-2003, 00:52
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#1 |
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Naughty Boy!
Join Date: Jan 2003
Posts: 391
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Does anyone know if VS3 will support matrix multiplication?
Meaning single cycle [4x4] x [1x4] mutiplication?(Or 16 FMACs per shader)? I haven't been upto date on shader technology. Thanks.
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11-Sep-2003, 05:46
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#2 |
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Member
Join Date: Jul 2003
Location: Houston
Posts: 652
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I have the relevant documentation before me and a 4x4 matrix multiply still takes up 4 instruction slots in VS3. In other words, it decomposes the macro into a "mul" followed by 3 "mads" (I'm assuming). I don't even think it's desirable to place 16 FP multipliers on one shader - it would be better IMHO to split those 4 vector units into 4 seperate shader units.
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11-Sep-2003, 09:26
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#3 |
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Tea maker
Join Date: Feb 2002
Location: In the Island of Sodor, where the steam trains lie
Posts: 4,379
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Sometimes you only want to do a [3x3]*[3x1] multiply. Why waste resources?
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