[Mesa-dev] [Bug 110253] glBlitFramebuffer fails on MSAA fbo source.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110253

            Bug ID: 110253
           Summary: glBlitFramebuffer fails on MSAA fbo source.
           Product: Mesa
           Version: 19.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/swr
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: wanghaipeng03 at baidu.com
        QA Contact: mesa-dev at lists.freedesktop.org

https://github.com/mesa3d/mesa/blob/master/src/gallium/drivers/swr/swr_screen.cpp#L908
https://github.com/mesa3d/mesa/blob/master/src/gallium/drivers/swr/swr_screen.cpp#L105

when using MSAA fbo as read source, and OSMesa framebuffer as target,
glBlitFramebuffer fails。

swr_blit: color resolve : 8 -> 0
swr: blit unsupported r8g8b8a8_unorm -> r8g8b8a8_unorm

I think it may be solved by setting nr_storage_samples to 0 in
src/gallium/drivers/swr/swr_screen.cpp swr_create_resolve_resource

      /* Create a single-sample copy of the resource.  Copy the original
       * resource parameters and set flag to prevent recursion when re-calling
       * resource_create */
      struct pipe_resource alt_template = msaa_res->base;
      alt_template.nr_samples = 0;
      alt_template.nr_storage_samples = 0;
      alt_template.flags |= SWR_RESOURCE_FLAG_ALT_SURFACE;

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