PSP Cache issues

siberianstar · Post by **siberianstar** » Fri Jul 14, 2006 4:34 am

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 · Post by **Insert_witty_name** » Fri Jul 14, 2006 4:39 am

Try:

Code: Select all

sceKernelDcacheWritebackAll&#40;&#41;;

Just after you start your game loop. (ie. your while loop or whatever)

[EDIT] You should get your own personal thread!

siberianstar · Post by **siberianstar** » Fri Jul 14, 2006 5:05 am

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

Insert_witty_name · Post by **Insert_witty_name** » Fri Jul 14, 2006 5:16 am

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

siberianstar · Post by **siberianstar** » Fri Jul 14, 2006 5:48 am

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 · Post by **Raphael** » Fri Jul 14, 2006 6:14 am

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 · Post by **siberianstar** » Fri Jul 14, 2006 6:21 am

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 · Post by **ReKleSS** » Fri Jul 14, 2006 7:11 pm

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.