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siberianstar · Joined: 22 Jun 2006 Posts: 70

Hello, i'm getting some problem with cache. I'm using GU to draw sprites and 3d but something it's displayed and something not. It's a cache problem.

I've tried to use

sceKernelDcacheWritebackInvalidateRange

for vertex data. But it didn't solve my problem at all, there is still something not drawn. Where should i flush the cache ? After what gu/gum functions?

Insert_witty_name · Joined: 10 May 2006 Posts: 376

Try:

siberianstar · Joined: 22 Jun 2006 Posts: 70

i've tried but it's not working good. Damn.

Insert_witty_name · Joined: 10 May 2006 Posts: 376

Then I would suggest that it isn't a cache issue at all.

siberianstar · Joined: 22 Jun 2006 Posts: 70

Yes it's a cache issue because if i try to

for (int x = 0; x < 20; x++)
sceKernelDcacheWritebackAll();

it seems working, but that's not the right solution

Raphael · Joined: 17 Jan 2006 Posts: 646 Location: Germany

If it doesn't display correctly after one call, then it's more likely the texture upload isn't synced at the time you're drawing or your drawing code is messed up all together.
Try sceGuTexSync() and if that doesn't help, provide more code.

siberianstar · Joined: 22 Jun 2006 Posts: 70

i'm not using

sceGuCopyImage

to copy image into vram. I'm just doing

sceGumDrawArray with GU_SPRITE and texture in the main ram.

ReKleSS · Posted: Fri Jul 14, 2006 7:11 pm Post subject:

The reason you write back the cache stuff is so that when the GU tried to read out of system ram, what's in system ram is what you actually wrote there. You want to place your sceKernelDcacheWritebackAll just before where the GU should be reading out the data. Generally, put them before sceGumDrawArray - that's what gets the GU to actually start doing stuff.