Samurai Shodown unplayble demo on MSX+V9990

Door albs_br

Champion (499)

18-11-2022, 23:22

I just made a small demo to show the power of the V9990.

Video:
https://youtu.be/F8jZBrrQmGo

Check it online:
https://webmsx.org/?ROM=https://github.com/albs-br/msx-samur...

Later I will post some technical aspects.

Hope you guys enjoy.

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Van erpirao

Paragon (1334)

18-11-2022, 23:36

oh my god!

Van thegeps

Paragon (1251)

19-11-2022, 10:13

Cool gfx, v9990 is indeed powerful. Keep it up, I'd like to see it moving/scrolling

Van Manel46

Paladin (674)

19-11-2022, 12:27

Congratulations on the demo. Is it in B1 mode?

Van albs_br

Champion (499)

19-11-2022, 13:21

P1 Mode.
Background is Layer B, with only 16 colors. Lots of space for the entire bg with animations.

Van Manel46

Paladin (674)

19-11-2022, 14:51

I understand. Sprite updating is very fast, and you have 2 palettes for them.

Van albs_br

Champion (499)

19-11-2022, 14:59

Sprites are pre loaded to vram.
The cool thing is that animation frames are cycled just changing R#25. Sprite Base Address Register. It acts as a "sprite page".

Van Manel46

Paladin (674)

19-11-2022, 17:22

https://www.msx.org/forum/msx-talk/graphics-and-music/spat-u...

Van M-A-D-M-A-X

Expert (128)

20-11-2022, 12:28

Impressive for a MSX

Van albs_br

Champion (499)

20-11-2022, 12:33

I don't update the SPRATR table. Is is fixed.
The method I use, which I explained above, can be considered kind of "cheating" as it cannot be used for a game, but for this particular use I feel it is a very elegant solution.

Van albs_br

Champion (499)

20-11-2022, 12:46

There are 8 sprites "pages" on VRAM. They are selected by R#25 register.
Each of them is a 256x256 pixel area.

I use only the first 4 pages. The animation uses 4 frames. Each frame of both characters is loaded at one page.

Earthquake (the big guy at right) is using the first 256x128 area, starting at 0,0
The other character uses the second 256x128 area below, starting at 0,128 coordinate.

This way the pattern numbers on SPRATR are always the same.

Just changing R#25 is enough for the sprites pointed by SPRATR be all new ones, a new frame of animation.

I hope my explanation would be good. But in case of any doubt don't hesitate to ask.