[Bug 26229] New: FEAR: waterplane rendering triggers SW fallback in mesa

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=26229

           Summary: FEAR: waterplane rendering triggers SW fallback in
                    mesa
           Product: Wine
           Version: 1.3.14
          Platform: x86
               URL: http://www.gamershell.com/download_10167.shtml
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: directx-d3d
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: liquid.acid at gmx.net


Hi there,

while profiling FEAR with sysprof I found out that rendering certain objects
trigger a software fallback in mesa.

If you check the demo version of the game, you can find such an object after
the first underground section: Once the game renders the waterplane that exists
in the next section the fallback becomes active and the performance collapses
(this happens once you leave the underground area with the ladder).
The engine probably uses an FBO for reflection of the world geometry on the
waterplane.

Profiling was done on my Intel i965, but I also noticed a slowdown on r600g, so
probably the fallback is also triggered there (going to check this later).

sysprof shows these two function consuming the majority of CPU time:
_mesa_texstore_s8_z24            54.21%
intel_ReadDepthSpan_z24_s8       32.06%

The span functions are used in the driver for software fallbacks. Tracing back
intel_ReadDepthSpan_z24_s8 shows:
IWineD3DDeviceImpl_DrawIndexedPrimitive
  drawPrimitive
    surface_load_ds_location
      glCopyTexImage2D
        copyteximage
          intelCopyTexImage2D
            copy_tex_image
              intelReadPixels
                _swrast_ReadPixels
                  read_depth_stencil_pixels
                    intel_ReadDepthSpan_z24_s8

My guess is that the fallback is triggered by the lack of using
EXT_packed_depth_stencil for stencil/depth handling.

Greets,
Tobias

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