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  1. Qt
  2. QTBUG-97026

RHI OpenGL backend working differently with multieffect

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    • Icon: Bug Bug
    • Resolution: Invalid
    • Icon: P3: Somewhat important P3: Somewhat important
    • None
    • 6.2.0
    • Qt RHI
    • None

      Run Qt6 multieffect testbed. Change blur amount to 1.0 and blur max to 64.

      • With d3d11 and vulkan backends the output looks very blurred as expected.
      • With opengl backend the output looks much less blurred & more pixelated.

      See the attached screenshots. I'm running it on windows laptop with 4k screen so could this be device pixel ratio related issue?

        1. qt6_multieffect_d3d11.png
          qt6_multieffect_d3d11.png
          382 kB
        2. qt6_multieffect_opengl.png
          qt6_multieffect_opengl.png
          316 kB
        3. qt6_multieffect_vulkan.png
          qt6_multieffect_vulkan.png
          370 kB
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            kagro Kaj Grönholm
            kagro Kaj Grönholm
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