test: allow skipping tests on Xephyr with GLES

The GLES tests need an actual GPU (/dev/dri/* device), which is not available
within github CI runners, so we need to skip those when running there.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

.github/workflows/build-xserver.yml

@@ -15,7 +15,7 @@ on:
 jobs:
     xserver-build-ubuntu:
         env:
-            MESON_ARGS: -Dc_args="-fno-common" -Dprefix=/usr -Dxephyr=true -Dwerror=false -Dxcsecurity=true -Dxorg=true -Dxvfb=true -Dxnest=true
+            MESON_ARGS: -Dc_args="-fno-common" -Dprefix=/usr -Dxephyr=true -Dwerror=false -Dxcsecurity=true -Dxorg=true -Dxvfb=true -Dxnest=true -Dtest_xephyr_gles=false
             LIBGL_ALWAYS_SOFTWARE: 1
             GALLIUM_DRIVER: llvmpipe
             PIGLIT_PLATFORM: x11_egl

meson_options.txt

@@ -151,3 +151,5 @@ option('docs-pdf', type: 'combo', choices: ['true', 'false', 'auto'], value: 'au
 # testsuite fine tuning - some things might not run everywhere
 option('test_rendercheck_triangles', type: 'boolean', value: false,
        description: 'testsuite: run rendercheck triangles tests (might fail on Xephyr)')
+option('test_xephyr_gles', type: 'boolean', value: true,
+       description: 'testsuite: run gles2/gles3 tests on Xephyr (might fail w/o DRI)')

test/meson.build

@@ -112,7 +112,11 @@ if get_option('xvfb')
     endif
 
     if get_option('xephyr') and build_glamor
-        foreach testsuite : ['','-gles2','-gles3']
+        glamor_tests = ['']
+        if get_option('test_xephyr_gles')
+            glamor_tests += ['-gles2','-gles3']
+        endif
+        foreach testsuite : glamor_tests
             test_env = piglit_env
             if(testsuite == '-gles2')
                 test_env = gles20_env