[Bug 44863] Performance regression in Prince of Persia 3D

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=44863

--- Comment #10 from Henri Verbeet  ---
The way this works in current ddraw/wined3d is quite different, so I suspect
not much of the original analysis still applies.

Is the application using d3d_device3_DrawIndexedPrimitiveVB() with that
particular vertex buffer? We currently pass "vb->size / stride" as
"vertex_count" to d3d_device7_DrawIndexedPrimitiveVB(). Perhaps it would be
advantageous to determine actual upper and lower vertex indices when
"index_count" is significantly smaller than the number of vertices contained in
the vertex buffer.