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Difference between revisions of "User:Buddha^/GSoC2007-ProjectDiary"
User:Buddha^/GSoC2007-ProjectDiary (view source)
Revision as of 01:10, 20 June 2007
, 01:10, 20 June 2007Added done work on 2007-06-19.
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(Added done work on 2007-06-19.) |
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It looks like some call is jumping in the middle of a "shr al, 1" instruction. | It looks like some call is jumping in the middle of a "shr al, 1" instruction. | ||
I'll see about that tomorrow... | I'll see about that tomorrow... | ||
== 2007-06-19 (Tuesday) - Got prototypes for AGI256 and AGI256-2 working == | |||
The jump instruction that was pointing in the middle of a "shr al, 1" | |||
instruction (I talked about that in yesterday's post) was part of some | |||
obsolete Hercules graphics mode code. So it was never used in AGI256's | |||
or AGI256-2's code. | |||
Reverse engineered some more of the AGI256. Tried a prototype in ScummVM | |||
based on a theory about how AGI256 works. Didn't work straight away... some | |||
things were off. So took another look at the blitting function | |||
in AGIOBJS.OVL as the blitting function was one of the points were I | |||
wanted/needed more information. Finally at some point it worked! | |||
AGI256 prototype support for ScummVM is here :-). | |||
Encouraged or just on a plain roll I looked at the AGIOBJS.OVL differences | |||
in the blitting function between AGI256 and AGI256-2. There wasn't much | |||
difference in them. Just that the AGI256-2 didn't use mirroring or | |||
run length encoding for its views (That info I had already got from | |||
AGI256-2's readme, though) and little else (How it wrote the pixels into | |||
memory for one). Tried another prototype for supporting AGI256-2 and other | |||
some fiddling and coding, it now works too. | |||
There's some discrepancy in AGI256-2's intro (The background area surrounding | |||
the AGI256-logo, the color bar and the authors text isn't all black, it's | |||
partially grey). But I get something very similar when I run the AGI256-2's | |||
hacked AGI.EXE from command line in full screen mode under Windows | |||
2000 (Although as I tried it just now, it doesn't always do that). | |||
Running the AGI256-2 demo just by clicking on the AGI256-2's hacked | |||
AGI.EXE in Explorer works correctly. So I'm not sure what's causing it | |||
exactly. Gotta look into it... | |||