[Mesa-dev] [Bug 100668] No pixel formats with WGL_SWAP_UNDEFINED_ARB && WGL_DOUBLE_BUFFER_ARB=true

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100668

            Bug ID: 100668
           Summary: No pixel formats with WGL_SWAP_UNDEFINED_ARB &&
                    WGL_DOUBLE_BUFFER_ARB=true
           Product: Mesa
           Version: 17.0
          Hardware: x86 (IA32)
                OS: Windows (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Mesa core
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: genpfault at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

I'm using llvmpipe on Windows 7 x64, though LLVM & Mesa are built for 32-bit.

Requesting WGL_SWAP_UNDEFINED_ARB or WGL_SWAP_COPY_ARB in conjunction with
WGL_DOUBLE_BUFFER_ARB = TRUE results in wglChoosePixelFormatARB() returning
zero supported pixel formats.

These attributes work:

int pixel_attributes[] =
{
    WGL_SUPPORT_OPENGL_ARB, TRUE,
    WGL_DOUBLE_BUFFER_ARB, TRUE,
    0
};

These do not:

int pixel_attributes[] =
{
    WGL_SUPPORT_OPENGL_ARB, TRUE,
    WGL_DOUBLE_BUFFER_ARB, TRUE,
    WGL_SWAP_METHOD_ARB, WGL_SWAP_UNDEFINED_ARB,
    0
};

This is causing ANGLE to fail to get a valid pixel format when using Mesa as
its OpenGL backend:
https://chromium.googlesource.com/angle/angle.git/+/master/src/libANGLE/renderer/gl/wgl/wgl_utils.cpp#35

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