[Bug 91158] Piglit regression: spec/ARB_texture_multisample/arb_texture_multisample-sample-mask-execution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91158

            Bug ID: 91158
           Summary: Piglit regression:
                    spec/ARB_texture_multisample/arb_texture_multisample-s
                    ample-mask-execution
           Product: Mesa
           Version: 10.6
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: svyatoslav.pankratov at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Piglit test
spec/ARB_texture_multisample/arb_texture_multisample-sample-mask-execution
starts fail after adding XRGB8888 format to intel_screen_make_configs to Mesa
10.6 (commit 28090b30dd6b5977de085f48c620574214b6b4ba)

spec/ARB_texture_multisample/arb_texture_multisample-sample-mask-execution
fails in src/mesa/main/blit.c: _mesa_blit_framebuffer() with bad src/dst
multisample pixel formats. But in intel driver can handle both RGB and RGBA
src/dst pixel formats. 

Adding additional checks to compatible_resolve_formats function can solve this
regression, but...
+   if ((readFormat == GL_RGB8 || readFormat == GL_RGBA8) &&   
+       (drawFormat == GL_RGB8 || drawFormat == GL_RGBA8))       
+       return GL_TRUE;                                          
+                                                             
+                                                                

But some tests from OGLconform fails too due they trying to check color with
alpha. And this fix isn't valid for it.

Reverting 28090b30dd6b5977de085f48c620574214b6b4ba may broke Weston.

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