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  1. Qt
  2. QTBUG-74968

ANGLE: Painting with QPainter on QOpenGLWidget flips R and B channels

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    • Icon: Bug Bug
    • Resolution: Fixed
    • Icon: P2: Important P2: Important
    • None
    • 5.12.0, 5.12.2
    • GUI: OpenGL
    • None
    • Windows

      With Angle openGL implementation, when drawing with QPainter on QOpenGLWindget that has surface type set to GL_RGBA16F, R and B color channels are swapped. Red is painted as Blue and vice versa.

       

      The problem is caused by commit ede3791df8330ed8daae6667d025ad40219a9f5f that introduced usage of GL_TEXTURE_SWIZZLE_RGBA, which is not supported by OpenGL ES standard.

       

      Original bugreport in Krita: https://bugs.kde.org/show_bug.cgi?id=406196

      I'll try to come up with a fix.

       

       

        For Gerrit Dashboard: QTBUG-74968
        # Subject Branch Project Status CR V
        258193,5 Fix swizzling when rendering QPainter on QOpenGLWidget with Angle 5.12 qt/qtbase Status: MERGED +2 0

            lagocs Laszlo Agocs
            dkazakov Dmitry Kazakov
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              Created:
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