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yoyofr · Joined: 25 Jun 2005 Posts: 23 Location: paris

I'm having some color palette update issues....

I'm working in 5551 color mode, with 8bits texture, using replace mode & alpha.
I'm rendering sprites & have to switch the palette multiple times. Moreover some entries in my palette are transparent (|=0x8000).
Sometimes it seems the alpha isn't used in the rendering, so I guess it's a problem of palette updates.

Here's how it works basically :

1st rendering of n sprites :
copy master palette in a my working palette (using non cacheable addresses with |=0x40000000)
patch some entries with a OR 0x8000 (this entries will be transparent)
call sceGuClutLoad to load my patched palette
do the actual rendering
2nd rendering of m sprites :
same as before, but patching other entries
3rd,....

I've usually less than 10 steps in gu list.
Most of the time it works well, but sometimes I see the sprites pixels
which should be transparent.
Moreover it happens on static data! I mean I render the same screen
with the same list & sometimes it looks like the palette isn't loaded correctly.

Any idea of a potential sync issue when loading multiple palettes in the same rendering pass (in the same gu list) ?

ector · Joined: 12 May 2005 Posts: 195

is the pointer you use to patch the entries noncachable?

yoyofr · Joined: 25 Jun 2005 Posts: 23 Location: paris

chp · Joined: 23 Jun 2004 Posts: 313

try inserting sceGuTexSync() or sceGuTexFlush() after setting the texture and see if it helps.
_________________
GE Dominator

yoyofr · Joined: 25 Jun 2005 Posts: 23 Location: paris

thx for the help, but I fixed the bug in the meantime.
the issue was in the way I proceeded :
1/ load new palette (fast)
2/ init my vertices (slow) & update texture
3/ load texture & render
and then 1/ 2/ 3/ again

I changed it to
1/ init vertices & update texture
2/ load texture
3/ load new paletet & render

with this it seems to be ok!