- added locking for concurrent access to the D3D device
- improved tracing
- added support for most texture combine stages (inspired by the D3D8
  code)
- disable current lock / unlock code pending proper solution

- minor indentation changes
- fix SELECTARG2 behavior (with help from Lionel Ulmer)
- surface locking/unlocking (only rendering and textures surfaces
  supported now)
- beginning of Target/Front surface support
- try to get D3DTOP_SELECTARG_* working
- implemented D3DTOP_SUBTRACT: currently only if OpenGL1.3 is used, we
  have to use GL_SUBTRACT_ARB for other versions

Ulmer).

console.

Disable reference enumeration.

otherwise we'll fail to scroll all children.

Dmitry Timoshkov).

Windows.

Make /c and /k effectively exclusive, like the real cmd does.
Fix handling of /q: it's compatible with /c and /k.
Added compatibility with /t /x and /y, just ignore them.

Handle EINVAL the same way as EOVERFLOW.

proc.