[Bug 39057] Support for Indexed Vertex Blending

[wine-bugs at winehq.org]

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

--- Comment #15 from swswine at gmail.com ---
Created attachment 52746
  --> https://bugs.winehq.org/attachment.cgi?id=52746
Patch to implement index version support (using UBO, wine 1.7.55)

I updated the patch to use UBOs to transfer blend matrices, and now all 256
possible matrices are supported. The patch is for wine release 1.7.55.

Vertex blending without indices also use UBO with this patch. The patch is
still not optimal in a sense that there are much of extra updates of the buffer
with all the 256 matrices on any transform matrix change or view matrix change
(and even for every shader which is redundant as UBO is common for all
shaders). But this is in place only if vertex blending is actually requested by
application. If not, UBO is not created (and '#extension
GL_ARB_uniform_buffer_object' is not added), and glsl shader is even simplified
a bit compared to current release version. So I hope this patch should not
introduce any regression for the applications not using vertex blending.

Neater solution on matrix update is of course possible but requires getting
deeper into glsl pipeline update logic.

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