[Bug 27600] Screen fills with visual artifacts in World of Tanks.

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=27600

--- Comment #6 from Stefan Dösinger <stefandoesinger at gmx.at> 2011-07-01 18:02:03 CDT ---
I didn't yet get around to writing a test to see if we can isolate this problem
in fglrx. If anyone wants to do so, this would be the first test setup I'd try:

1) Create a big VBO(probably 4*sizeof(float)*65536), and a second one with
65536 float3s with position data. Maybe even try a bigger buffer.
2) Fill the VBO with float4(1, 0, 0, 0), red
3) Draw something with the two FBOs to make the driver load them(using an
indexed draw to force the driver to load the entire buffer)
4) call glFinish()
5) Map the color FBO with MAP_UNSYNCHRONIZED_BIT | MAP_FLUSH_EXPLICIT_BIT
6) Fill the buffer with float4(0, 1, 0, 0), green
7) flush the entire range
8) Unmap it
9) Draw a quad with it using an indexed draw, try various indices. Of course
the position buffer, shader and stream sources have to be set up correctly.

If the driver behaves correctly, the draw will alawys read float4(0, 1, 0, 0)
from the color VBO. If the driver misbehaves in the way I suspect it does it
will sometimes read float4(1, 0, 0, 0).

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