[Bug 19306] visual bugs on Trackmania in 1.1.19

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=19306


Stefan Dösinger <stefandoesinger at gmx.at> changed:

           What    |Removed                     |Added
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           Keywords|regression                  |
                 CC|                            |stefandoesinger at gmx.at




--- Comment #2 from Stefan Dösinger <stefandoesinger at gmx.at>  2009-07-13 10:48:43 ---
Not a regression, even though it seems like one.

These patches were specifically written to enable Trackmania's PC3 (Shader
Model 3) renderer. The problem of this renderer is that it needs 255 vertex
shader constants in a shader, and our GLSL backend cannot provide this(yet).

You can configure the game to use its Shader Model 2 codepath, which will give
you the old graphics back, with working cars, but less details. Or you can use
the ARB backend if you have an Nvidia card. ARB has a tighter control over the
used shader constants, so we can get all the 255 constants the game needs. The
third alternative is to buy a geforce 8 card, which supports 4096 shader
constants. (Even ARB cannot provide the 256'th vertex shader constant however)

We can provide those 255 shader constants on dx9 cards with GLSL too, but it
would be a set of ugly hacks, and just work by sheer luck because the shader in
question does not trigger any condition when the GLSL compiler has to load some
private constants.

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