[Mesa-dev] [Bug 34042] New: Surfaceless eglMakeCurrent() fails if the supplied EGLContext is not a dummy context

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34042

           Summary: Surfaceless eglMakeCurrent() fails if the supplied
                    EGLContext is not a dummy context
           Product: Mesa
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
        AssignedTo: mesa-dev at lists.freedesktop.org
        ReportedBy: alexandros.frantzis at linaro.org


Created an attachment (id=43116)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43116)
Example exhibiting the issue

In a EGL implementation that supports EGL_KHR_surfaceless_opengl, making an
EGLContext current without any surfaces works only if the supplied EGLContext
is a "dummy" one (see the example).

Running the example on my system (r600g but EGL_SOFTWARE=1 results are the
same) I get:

$ MESA_DEBUG=1 ./egl-surfaceless 
EGL_KHR_image_base EGL_KHR_image_pixmap EGL_KHR_image EGL_KHR_reusable_sync
EGL_KHR_fence_sync EGL_KHR_surfaceless_gles1 EGL_KHR_surfaceless_gles2
EGL_KHR_surfaceless_opengl 
Mesa warning: couldn't open libtxc_dxtn.so, software DXTn
compression/decompression unavailable
Mesa warning: couldn't open libtxc_dxtn.so, software DXTn
compression/decompression unavailable
eglMakeCurrent Dummy Succeeded: 0x3000
Mesa warning: MakeCurrent: incompatible visuals for context and drawbuffer
eglMakeCurrent Normal Failed: 0x3000

It is strange that although the second eglMakeCurrent fails, the eglError()
returns EGL_SUCCESS (0x3000).

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