[Bug 94595] [Mesa AMD&swrast] Texture views attached as framebuffers return their viewed tecture's color encoding and render incorrectly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94595

            Bug ID: 94595
           Summary: [Mesa AMD&swrast] Texture views attached as
                    framebuffers return their viewed tecture's color
                    encoding and render incorrectly
           Product: Mesa
           Version: git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: esmith at feralinteractive.com
        QA Contact: dri-devel at lists.freedesktop.org

As seen in the example given, when attaching an SRGB/RGB texture view is
created from an alternate RGB/SRGB texture, then attached as a framebuffer,
rendering will gamma correct wrongly and querying
GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING will return GL_LINEAR for an SRGB
backed frame buffer.

This is causing AA renders to be too dark as in our unreleased project, among
many other subtle colour issues.

Tested on latest 11.3 (git-9d9965c from oibaf) and seen on older drivers as
well.
$ g++ TextureViewFramebufferSRGBTest.cpp.cpp $( sdl2-config --cflags --libs )
-lGL
This reproduces on Mesa AMD and swrast.

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