Emulator

reminds me of the issues that were in SMG, until an initialized variable in the shaders
was set to 0....

BTW on old revs it also shows background if SMG hack is enabled

if you select disable fog in the world menu, you only can see the map but "white".
So, need be fix more.

Tino/rodo was saying it looked like an unsupported fog type. Doesn't matter, game is
unplayable till the hle plugin is fixed.

someone in the forum wrote it does work with the LLE sound plugin enabled. but it's
too slow for me to test

if you disable the dual-core option it'll be fullspeed :)

i'm single core user, so it's standard turned off

Ok, so this is my first attempt to mess with Dolphin's code...
Since I'm no expert at that, after a while messing with it, I figured out the following:
At PixelShaderManager.cpp, line 209, on NSMB, the value for bpmem.fog.a.GetA() is too high (around 6) while on other games (SSB
and Mario Kart Wii) it's way below 1...
I tried to understand why it was happening, but got a little confused on that GetA() method... It doesn't seem to be the problem
though...
So, my hack (and a pretty ugly one, I might add) is that I changed:

SetPSConstant4f(C_FOG + 1, a, b, bpmem.fog.c_proj_fsel.GetC(), 0);

to:

if(a < 2)
    SetPSConstant4f(C_FOG + 1, a, b, bpmem.fog.c_proj_fsel.GetC(), 0);
else
    SetPSConstant4f(C_FOG + 1, 0.0, 1.0, 1.0, 0);

And it worked... Still got the fog on games like SSB and the background is showing on NSMB...
But I know we should have fog on NSMB, so the problem is that somehow, bpmem.fog.a.GetA() is returning the wrong value...
Just hope I pointed someone in the right direction... Sorry I couldn't do more than that though...

Without looking at the surrounding code (and probably not knowing what it actually
does): a value of 6 in places where a float is wanted? Maybe that value should be
clamped into 0.0 to 1.0 range, by /10.f (or even /100.f)?

I got it... The problem wasn't on GetA after all...

PixelShaderManager.cpp line 209

from:

float a = bpmem.fog.a.GetA() * ((float)(1 << bpmem.fog.b_shift));

to:

float a = bpmem.fog.a.GetA() * ((float)(1 << (bpmem.fog.b_shift - 1)));

If you guys want, I can create a patch...
So now we got fog on SSBB, NSMB and all the other games, while still having the
background showing on NSMB \o/

btw: I don't just guessed it... I got it from BPMemory.h:679 that says:
u32 b_shift; // b's exp + 1?

With the previous hack: http://img709.imageshack.us/img709/6963/nofog.jpg
With the new hack (fix?): http://img692.imageshack.us/img692/6822/yesfog.jpg

I see that in first screenshot you are getting 53 fps, but with the new hack you're
getting only 29 fps (second screenshot). Seems a big performance drop. If you could
take a look at the performance drop would be perfect.

Anyway, any patch to solve this issue will be welcome :) Thanks fgfemperor.

Hmm actually I was using a lot of CPU with other programs open when I took the second
screenshot... After I closed it all I noticed no performance drop whatsoever!
Also, it's just a subtraction, it shouldn't affect performance at all!
Anyway here's the patch! =)

Interesting......
Which games have you tested this with.

Also does it fix it in the OpenGL plugin as well.

Great! I've tried the fogfix.patch and now I can finally see the fog in NSMB!
Someone should add the fix patch in the next svn.

Just need to make sure this doesn't break any games.

Well I've tested this on Mario Kart Wii, Super Smash Bros. Brawl, Paper Mario, Mario
Galaxy and, of course, New Super Mario Bros. Wii... Also this works for both OpenGL and
Direct3D.
Also, I think it shouldn't break any games... From my point of view, thw worst that
could happen is a game losing its fog...

Patch looks good, go ahead and submit. You got access, fgfemperor.