[Bug 8357] EverQuest models not shown

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=8357





--- Comment #9 from Julio Fernandez <ucldb at wanadoo.es>  2008-02-09 08:49:14 ---
FIX FOR THE BUG

I finally managed to get the models show properly (tested at 0.9.54)

I will try to send the info to the devs when I find out how to get this
information to them:


=====================
These are my findings:

The main executable is eqgame.exe it typically accesses D3D through a custom
dll eqgraphicsdx9 which interacts with D3D itself or through 

d3dx9_30.dll

Using channels and adding some extra messages into certain source files I got
to track a possible reason:

The game was declaring vertex lists with a vertex of type '0xfe' and +189
offset

Sadly, I could not get any extra information tracking just from source code, so
I had to run the game under Windows on a computer and 

using windbg to debug it, while running the same time on another computer the
game under Debian etch using winedbg to debug, and so 

tracing both programs in assambler (I burnt my eyelashes there!), the fact that
I could have d3d dll symbols availables on the windows box 

was the key here, I really missed winedbg to be able to read pdb files :(

After many hours I was able to track down the reason, and to my surprise it
seems its not wine's fault (for the most of it)

The 'troublesome' vertex are apparently Blended ones on a Mesh setup.

When d3dx9_30 calls ConvertToIndexedBlendedMesh, it calls GetDeviceInfo to get
the device capabilites, in the end wine returns the 

capabilites through IWineD3DImpl_GetDeviceCaps in wine/dlls/wined3d/directx.c

Here comes the fun thing, the attribute MaxVertexBlendMatrices in D3DCAPS9,
from (MSDN):

"Maximum number of matrices that this device can apply when performing
multimatrix vertex blending. For a given physical device, this 

capability may vary across Direct3D devices depending on the parameters
supplied to IDirect3D9::CreateDevice."

At the moment is set in wine as *pCaps->MaxVertexBlendMatrices =
GL_LIMITS(blends) which results in a value of 0 (at least in my Linux 

computer/build), while under Windows (XPSP2 DX9c) results in a value of 4

d3dx9_30 has a check right after capabilites are returned comparing that value
with 2, resulting in different code paths for the remaining 

of MaxVertexBlendMatrices function, when the value was 0 both Linux and Windows
(hacking the returned value to be 0) make those odd '0xfe' 

vertexes to be inserted (in Linux that makes the models to not be shown, in
Windows it makes eqgame.exe to crash)

I proceeded then to try to 'hack' wine to return a value of 4, adding the line

pCaps->MaxVertexBlendMatrices=0x4;

Before returning from function
IDirect3DDevice9Impl_GetDeviceCaps(LPDIRECT3DDEVICE9 iface, D3DCAPS9* pCaps) at
wine/dlls/d3d9/directx.c

The result: MaxVertexBlendMatrices runs the same path as Windows does, the odd
'0xfe' vertexes are not generated and the models work are 

now shown as expected

My apologies for the long post, but I thought it would be handy to tell the
full story to justify calling your atention on this

- d3dx9_30 ConvertToIndexedBlendedMesh shows an 'odd' behavior when
MaxVertexBlendMatrices capabilites in D3DCAPS9 is 0
- Is wine reporting the right value for MaxVertexBlendMatrices ??? As it seems
the game works flawlesly in wine when it's hacked to be 4 

(I don't know if this 'hack' would affect other programs in any other way
=====================

So while we wait for a dev answer about this the 'fix' that replaces the prior
'HOWTO' is as follows:

Add this line:

pCaps->MaxVertexBlendMatrices=0x4;

In file:

(your wine source directory)/dlls/d3d9/directx.c

At function:

IDirect3DDevice9Impl_GetDeviceCaps(LPDIRECT3DDEVICE9 iface, D3DCAPS9* pCaps)

Before returning (return hrc;), line 176 (as of 0.9.55)

Build wine as usual and happy Everquesting

(Side note, for me it works flawlesly with all graphic settings BUT 'shadows'
(crashes the game), I've seen some very minor artifacts when 'advanced lighing'
is on too. I haven't played for too long, I wanted to post this as soon as
possible ;) will see next days now that Everquest should be FULL playable.


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