[Bug 91509] Depth render buffer corruption

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=91509

            Bug ID: 91509
           Summary: Depth render buffer corruption
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/r200
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: stefandoesinger@gmx.at
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 117462
  --> https://bugs.freedesktop.org/attachment.cgi?id=117462&action=edit
Screenshot

Since my patches from a few months ago Wine can now use depth renderbuffers
instead of textures for FBOs if GL_ARB_depth_texture is not supported. This
makes FBOs work on r200, but it appears that there is some render corruption.
The best way to describe it is that some parts of the depth buffer seem to be
read or written to the wrong place inside the buffer.

The attached screenshots show the issue. The application I've run here is the
StencilMirror.exe sample from the DirectX 8 SDK. in fbo.png you see incorrect
draws at the edges of the window. nofbo.png uses the GLX drawable (GL_BACK)
instead of rendering to an FBO, which doesn't show the corruption.

The corruption seems to be resolution dependent. I don't see it when I am
running the application at 1400x1050 for example.

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