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dsp
11-28-2011, 04:58 AM
Post: #1
dsp
does anybody knows how to use the dsp chip in scu?

has anybody tried to use it?

i like to use it for light/shading and preclipping.

i read where the dsp can do light calculation but

can anyone tell me how the dsp do lighting calculation?

a mthpolytransparm table is listed in the program

library user's guide 2 page 90, there are some thing

im not sure how/what to write.

can someone help me?
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03-10-2012, 11:10 PM
Post: #2
dsp
Coolgame Wrote:does anybody knows how to use the dsp chip in scu?

has anybody tried to use it?

i like to use it for light/shading and preclipping.

i read where the dsp can do light calculation but

can anyone tell me how the dsp do lighting calculation?

a mthpolytransparm table is listed in the program

library user's guide 2 page 90, there are some thing

im not sure how/what to write.

can someone help me?

You're going to have to run Sega's DSP assembler. If not, write one (I'll do that myself eventually).

The datapath in the SCU manual is rather clear as to how it functions.

Write the necessary instructions, use Sega's assembler and it'll produce a binary. That binary needs to be loaded into DSP RAM. From there, enable it through SCU registers and the SMPC. This is roughly how'd I do it. I would first try to compute a simple polygon, copy that to RAM and output its contents. After that, try matrices (multiplying a scalar and a matrix), etc.
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