[2/3] d3d: fix alpha handling in DirectX6 texture blending mode D3DTBLEND_MODULATE

[Alexander Dorofeyev]

Native uses texture alpha if texture has alpha in pixelformat and diffuse alpha 
otherwise. These changes implement such behavior (instead of always using 
texture alpha).
---
  dlls/ddraw/device.c          |    3 +--
  dlls/wined3d/state.c         |   23 +++++++++++++++++++++++
  include/wine/wined3d_types.h |    1 +
  3 files changed, 25 insertions(+), 2 deletions(-)
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