DTM Race Driver 3; Toca 2 Graphic Problems

[zschigi2]

in DTM Race Driver 3 and Toca 2 there are massive Graphic Problems ingame

(some kind of scan lines over the game-graphics)

[dbz400]

Can you post the screenshot ?

[zschigi2]

yes :-)

[dbz400]

How about in software rendering mode ?

[zschigi2]

in software rendering mode i only get a black screen...

[dbz400]

Okay i can reproduce it now in both GLES and softgpu

[unknownbrackets]

Has this improved with simulate block transfers?

-[Unknown]

[zschigi2]

unfortunately it does not. the problems are still the same. (tested on my s3)

[unknownbrackets]

Does it have the same problems on Windows? Maybe it's an armjit bug. Would help to narrow it down.

-[Unknown]

[zschigi2]

it´s the same on windows... :-(

[unknownbrackets]

Can you try to find the problem on Windows using the GE debugger?

https://github.com/hrydgard/ppsspp/wiki/How-to-find-a-graphic-issue-with-the-GE-debugger

-[Unknown]

[zschigi2]

if i follow the instructions i get these:

[unknownbrackets]

Well, the goal is to find it when the GE debugger is drawing the thing that shows up wrong. In your screenshot, it seems to be drawing some sliver in a separate framebuffer... this is interesting (btw, you are using buffered rendering, right?), but it doesn't really show what's causing this graphical issue.

Keep pressing step prim until you start to see the correct graphics. It highlights in red the part it's about to draw (as in your screenshot.)

-[Unknown]

[zschigi2]

this time with buffered rendering on:

[unknownbrackets]

Okay, but those are just it drawing the screen still, right?

It's gonna spend a lot of time doing that, you can try pressing "Step Tex" if you're impatient, but if you pass where it draws the graphical glitches you have to press "Step Frame" and start over.

-[Unknown]

[zschigi2]

here we go...

[ppmeis]

Tested in latest build. Same status:

[ppmeis]

Tested with latest build. Same status.

[unknownbrackets]

Are you able to capture when the GE debugger's red overlaps with one of the red lines specifically (e.g. not just the full screen, but is only over the black line, or right at the black line?)

The earlier screenshot looks like a clear and is probably not related.

-[Unknown]

[hrydgard]

Probably broken geometry that gets discarded by the real PSP because the coordinates are way outside the guardband, and the PSP doesn't do proper triangle clipping. I'll send a pull request later with an experimental fix for D3D11 but it relies on undefined behaviour in vertex shaders to kill triangles, which isn't very nice. A "correct" fix will need geometry shaders.

[LunaMoo]

Works fine on windows at least, so that report might be another one from android where it might not had enough vertex registers or that's how the "optimization" fixing other games mentioned there is working aka it might be completely disabling the guardband fix.;]

[hrydgard]

Or forcing the coordinate to NaN isn't doing the right thing on the hardware....

[marosis]

It is working right on every backend? I tested it on OpenGL on android and it is not working for me

[marosis]

[marosis]

We need more testers

[hrydgard]

@unknownbrackets maybe it would help to set all four parts of the position vector to NaN, not just w...

[marosis]

Now i tested on latest build if i didn't get Wrong info and yeah STILL SAME status.

[hrydgard]

Thanks marosis. Stay tuned, I'm going to try my idea in the weekend.

[marosis]

I will

[unknownbrackets]

That sounds worth trying. The cull distance extension isn't supported by much other than Adreno, so that probably won't help.

Maybe the other option is to try to set depth to a value that would be (mostly?) clipped and then also discard in the frag shader, but that sounds pretty awful...

-[Unknown]

[ghost]

This is the only graphics glitch I encounterd in my Mali-450 MP I think it's normal for my GPU same graphics issue in Monster Hunter 3rd HD

[hrydgard]

On Mali, those issues are still there underneath even if you use earlier versions with the stripe bug, right? If so they are definitely a separate issue..

[ghost]

PPSSPP 1.6.3 Playstore

Yeah separate issue..

[ghost]

Upon testing in my brother phone Kata Selfie Mali-T720 GPU MT6753 Hardware

But in my Cloudfone Excite Prime Mali-450 MP GPU MT6592 Hardware it's fixed the only issue I have is the small black square that also exist in MH3RD HD :/

[unknownbrackets]

I suppose that means Mali-T7xx doesn't support what we're trying to do. The weird thing is the lines are pretty much the same, but maybe it's because they're all nan.

-[Unknown]

[marosis]

I can confirm it. I have same mali-T720

[MJH1000]

The game can be made playable using this cheat, 'Graphical glitches partial FIX'.

ULES00615.ini

_S ULES-00615
_G DTM Race Driver 3 Challenge [EUR]
_C0 Graphical glitches partial FIX
_L 0xE0018C84 0x000AB7BA
_L 0x200AB7B8 0x34040000
_C0 Graphical glitches NO-FIX [Default]
_L 0xE0013404 0x000AB7BA
_L 0x200AB7B8 0x8C840000

[marosis]

Please do from it for me File. I did TXT, paste code, saved, renamed to ini and it is not working

[marosis]

All cheats are working from PPSSPP forum but that your not.

[MJH1000]

The cheat does not remove all the graphics glitches, only the worst ones.

[marosis]

No. I mean i can't launch it. He is not showing in the emulator

[benderscruffy01]

can the label android be add as this doesnt happen on windows

[LunaMoo]

No, it will still happen on windows, the feature fixing this issue is disabled on old gpu's. not just mobiles.

[benderscruffy01]

ok thanks for that

[unknownbrackets]

Maybe it makes more sense to close this and create a new issue (maybe referencing a list of the affected games for searchability) about guard band not working on older devices.

I don't have an affected device currently (except Vivante which can't handle a lot...) but some ideas collected from above:

• Perhaps set more components of the vert to NAN.
• Perhaps set w to 0 instead.
• Perhaps send an interpolated value to the frag shader, and discard when > 0 (won't be perfect, but might be better... that said, speed penalty.)
• Perhaps handle in software transform path? Maybe bigger speed penalty, and would require non-default setting or something...

-[Unknown]

[ghost]

@hrydgard Thanks finally its totally fixed ^^

•Mali-T720 MT8163 Android Phone Tablet