[Bug 21708] d3d is trying to use GL_DEPTH_TEXTURE_MODE_ARB when driver doesn't support ARB_depth_texture

http://bugs.winehq.org/show_bug.cgi?id=21708

--- Comment #32 from Stefan Dösinger  2012-12-23 04:13:46 CST ---
No, that's not the reason for the driver bug. The GPU chip behaves somewhat
strange. The driver code looks ok, but for some reason the GPU decides to
discard all geometry if the viewport dimensions are not inverted. I don't have
the GPU docs to see what the intended behavior is.

Maybe the driver has to be changed to always invert the viewport, and invert
all geometry when rendering offscreen to cancel out the y coordinate flip.
That'd be a pain with vertex shaders though.