[Bug 39057] New: Support for Indexed Vertex Blending

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=39057

            Bug ID: 39057
           Summary: Support for Indexed Vertex Blending
           Product: Wine
           Version: 1.7.47
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: directx-d3d
          Assignee: wine-bugs at winehq.org
          Reporter: swswine at gmail.com
      Distribution: ---

Created attachment 52025
  --> https://bugs.winehq.org/attachment.cgi?id=52025
Patch to implement indexed vertex blending support

Vertex blending support has been added recently
(https://bugs.winehq.org/show_bug.cgi?id=6955 was closed). But indexed vertex
blending is not supported yet. 

I've implemented rather straightforward patch to do it which works for me, it
is attached. Though I am far not familiar with wined3d development and not
quite sure that my patch is complete and does not have any caveats. 

A potential caveat with this patch is the following. Besides using indexes in
vertex shaders, a big enough number of supported vertex blend matrices is
required to really support this Direct3D feature. It was 4 in 1.7.47, I changed
to 128 using the same framework developed in 1.7.47. It may potentially fail on
some graphic cards due to large number of uniforms in vertex shader generated.
Besides the transfer of those uniforms may probably be optimized not to call
glUniformMatrix for every matrix when only one or few has changed.

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