[2/2][try 2] ddraw/tests: add test for D3DRENDERSTATE_TEXTUREMAPBLEND state

[Alexander Dorofeyev]

I've introduced these changes. Also I've found one issue my test wasn't
adequately covering (textures with and without alpha channel), so a few tests
were added for more rigorous and complete testing. Unfortunately additional
tests have shown D3DRENDERSTATE_TEXTUREMAPBLEND state is a bit more complicated
to properly implement than I thought, so some tests had to be put into todo_wine
blocks for now.

Stefan Dösinger wrote:
  > Appart of this issue I recommend to move the D3D1 creation into a separate
  > function. Eventually more D3D1 tests will be written, and we want to
  > discourage copypasting that huge block of code.
---
     dlls/ddraw/tests/visual.c |  783 +++++++++++++++++++++++++++++++++++++++++++++
     1 files changed, 783 insertions(+), 0 deletions(-)



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