PPSSPP Symbian Port

[xsacha]

(04-17-2013 06:37 PM)trini_fella Wrote:  And why does tehra dark warrior work so smoothly on the n8 anyway??

It's a Mini, like Jetpack Joyride. But yes, it doesn't abuse textures.

The texture handling in PPSSPP isn't that great yet.

Why are our textures so much bigger?
The PSP console used many tricks to fit these textures in to video RAM (of only 2MB!). One of them includes using paletted textures. These are incredibly small but mobile phones can't do these. Instead, in PPSSPP we create a full blown 32-bit texture when a paletted texture is requested. The difference is that we create an enormous texture and the PSP would have not even noticed it.
This fills up the N8's 32MB VRAM (of which only about 25MB is available) very quickly!

This can definitely be optimised!

Why did Nokia not allow the GPU to share system RAM?
This was because the N8 had a huge amount of video RAM at the time. 32MB was the biggest you could find on a mobile device. At the same time, the iPhone 4 had NO video RAM.
So, on the N8, the 256MB RAM was used for applications only. Meanwhile on the iPhone 4, 192MB of RAM was dedicated for applications and 64MB could be used for the GPU.

Note: 64MB still isn't enough for Jetpack Joyride but phones with 512MB RAM typically shared 128MB with the GPU.

The Nokia 700/701/808 resolved this issue by having dedicated video RAM of 128MB. It still doesn't use any of the (now 512MB) system RAM but it doesn't need to.