https://bugs.winehq.org/show_bug.cgi?id=6955
--- Comment #192 from Skotlex skotlex@mailforce.net --- (In reply to gamiljydcome from comment #191)
I tested BattleRaper2 with wine 1.7.46(patched 'Implement vertex blending in glsl-vertex-pipe') and wine 1.7.54, 3d model still broken. But with wine 1.5.28(patch 'Patch implementing software vertex blending for wine 1.5.21') the game works fine.
The software Vertex Blending throgh glsl still have problem in wine newly version.
Did you check bug #39057 ? The one thing missing from this bug fix is indexed software vertex blending, so the patch in the linked bug report may be what you need.