http://bugs.freedesktop.org/show_bug.cgi?id=21608
Summary: [radeon-rewrite] ctx->Stencil._Enabled stale when
accessed
Product: Mesa
Version: unspecified
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/DRI/Radeon
AssignedTo: dri-devel@lists.sourceforge.net
ReportedBy: otay...@redhat.com
Sequence of events:
radeon_clear_tris()
- calls _mesa_Enable(GL_STENCIL_TEST);
- Changes ctx->Stencil.Enabled
- draws
- ctx->Stencil._Enabled is updated to 1
- calls _mesa_PopAttrib();
- Restores ctx.Stencil.Enabled (but not _Enabled)
- calls _mesa_DrawBuffer()
- calls radeon_draw_buffer
- accesses ctx->Stencil._Enabled, which is not up-to-date
- Enables stenciling on the hardware
So the hardware is left with stenciling on, and subsequent drawing vanishes.
The patch I'll attach fixes the problem, I'm not sure if it's the best way to
handle it.
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