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2010-08-10 19:21

LHS

Registered: Dec 2002
Posts: 66

simple shaded / textured vector

Hi, I'm thinking how is possible to code a fast "simple shaded / textured vector" such as in Natural Wonders or http://noname.c64.org/csdb/release/?id=4613. I have some bytefields of coordinates and I can show an oldschool filled vector - and I will show the vector with shaded / simple textured sides.

Draw lines of one side into tmp gfx memory, fill (entire) by EOR, texture (entire) by AND and put (entire) on screen by ORA. Go to next side. It is slow. Or not? Is there a dodge (fake) for an optimalization?

I'm thinkink about instruction SAX (A & X), in A is the result of EOR and X contains a template of shade -> filling and texturing in one step. Next optimalization can be e.g. the vector screen size is $80*$80, but anyone (individual) of the sides don't exceed $60*$60, so that the tmp gfx screen (for EOR filling) can be smaller-faster.

Is it nonsense and the shaded vectors use another methods?

2010-08-10 20:37

Oswald

Registered: Apr 2002
Posts: 5094

if you want to eor fill the basic trick is to use 2 buffers, and mix them to the screen line by line.

buffer1:

a
a
a
a

buffer2:

b
b
b
b

screen:

a
b
a
b
a
b

2010-08-10 21:34

Skate

Registered: Jul 2003
Posts: 494

I think LHS was asking something else.

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