[PATCH 4/3] ddraw: Fix some texture blending modes.

[Alexander Dorofeyev]

I found an article in DirectX6 docs on legacy texture blending that very exactly 
defines formulas of these legacy modes and what texture stage states they map to 
in DX6. This allowed to add a few modes that weren't handled and fix one obscure 
mode that was implemented incorrectly.
---
  dlls/ddraw/device.c |   15 ++++++++++++---
  1 files changed, 12 insertions(+), 3 deletions(-)
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