Broken character models in dx8/9 games in wined3d

[Stefan Dösinger]

Am Dienstag 25 Juli 2006 04:21 schrieb Jason Green:
> I've spent a couple of days researching the issue of
> broken/upside-down character/object models in Wine in almost all newer
> games when you have vertex shaders enabled (Civ4, Half Life 2,
> Oblivion, Max Payne 2, etc.).  I think I've boiled it down to a single
> case:  When "device->renderUpsideDown" is set in the case where vertex
> shaders are enabled.  That flag gets set in device.c:7395 when the
> current renderTarget is not on the current swapchain.  The comments in
> the source say that the upside-downedness is produced by
> glCopyTexImage, so it sets a flag to flip everything over.
>
> In the case w/o shaders, there is code in drawprim.c which loads the
> WORLDVIEW and PROJECTION matrices and then multiplies those matrices
> by one which inverts the y coordinates when that flag is set. That
> seems to work in the case without vertex shaders, but when shaders are
> enabled, they bypass the WORLD, VIEW, and PROJECTION matrices
> entirely.  The shader case was written when only software shaders
> worked, but that is no longer true.   It loads identity matrices and
> performs the y flip, but that code is entirely irrelevant since the
> vertex shader doesn't reference those matrices; it only uses constants
> that are passed by the app, which we can't perform any type of fixup
> on since we don't know which constants will be used for which
> calculation.
>
> So, I think what we need to do is prevent ourselves from having to do
> any flipping whatsoever.  That's the part that I'm not sure how to do
> and is the reason for this email.  Can we load the textures in system
> memory first, perform a software reversing process, then load that up
> with glCopyTexImage instead?  Will we need to do that type of fixup
> every time the app locks/unlocks/changes part of the texture?  Or, is
> there a better way?
>
> I think I've figured out the problem, it's just the next step of
> fixing it that I'm unsure of.  :-)
Can we flip around the y axis in the shader? Or can we flip around the texture 
coords when drawing from the offscreen texture? If I understand it correctly 
this only affects offscreen rendering.
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