Make PyOpenGL a required dependency

Looks like the "black screen" issue isn't the only thing going wrong, some
people even report segfaults since the vendor check was added.

CHANGELOG.asciidoc

@@ -23,8 +23,7 @@ New dependencies
 - New dependency on `PyQt5.QtOpenGL` if QtWebEngine is used. QtWebEngine depends
   on QtOpenGL already, but on distributions packaging split PyQt5 wrappers, the
   wrappers for QtOpenGL are now required.
-- New optional (but recommended) `PyOpenGL` dependency with QtWebEngine to work
-  around a bug where a black screen is shown with some setups.
+- New dependency on `PyOpenGL` if QtWebEngine is used.
 
 Added
 ~~~~~

README.asciidoc

@@ -108,6 +108,7 @@ The following software and libraries are required to run qutebrowser:
 * http://jinja.pocoo.org/[jinja2]
 * http://pygments.org/[pygments]
 * http://pyyaml.org/wiki/PyYAML[PyYAML]
+* http://pyopengl.sourceforge.net/[PyOpenGL] when using QtWebEngine
 
 The following libraries are optional and provide a better user experience:
 

qutebrowser/browser/webengine/webenginesettings.py

@@ -209,12 +209,7 @@ def init(args):
     if not os.environ.get('QUTE_NO_OPENGL_WORKAROUND'):
         # Hide "No OpenGL_accelerate module loaded: ..." message
         logging.getLogger('OpenGL.acceleratesupport').propagate = False
-        try:
-            from OpenGL import GL  # pylint: disable=unused-variable
-        except ImportError:
-            pass
-        else:
-            log.misc.debug("Imported PyOpenGL as workaround")
+        from OpenGL import GL  # pylint: disable=unused-variable
 
     _init_profiles()
 

qutebrowser/misc/earlyinit.py

@@ -341,6 +341,7 @@ def check_libraries(backend):
         modules['PyQt5.QtWebEngineWidgets'] = _missing_str("QtWebEngine",
                                                            webengine=True)
         modules['PyQt5.QtOpenGL'] = _missing_str("PyQt5.QtOpenGL")
+        modules['OpenGL'] = _missing_str("PyOpenGL")
     else:
         assert backend == 'webkit'
         modules['PyQt5.QtWebKit'] = _missing_str("PyQt5.QtWebKit")

qutebrowser/utils/version.py

@@ -186,6 +186,7 @@ def _module_versions():
         ('yaml', ['__version__']),
         ('cssutils', ['__version__']),
         ('typing', []),
+        ('OpenGL', ['__version__']),
         ('PyQt5.QtWebEngineWidgets', []),
         ('PyQt5.QtWebKitWidgets', []),
     ])

requirements.txt

@@ -7,3 +7,4 @@ MarkupSafe==1.0
 Pygments==2.2.0
 pyPEG2==2.15.2
 PyYAML==3.12
+PyOpenGL==3.1.0

tests/unit/utils/test_version.py

@@ -496,6 +496,7 @@ class ImportFake:
             'typing': True,
             'PyQt5.QtWebEngineWidgets': True,
             'PyQt5.QtWebKitWidgets': True,
+            'OpenGL': True,
         }
         self.version_attribute = '__version__'
         self.version = '1.2.3'
@@ -555,7 +556,7 @@ class TestModuleVersions:
         """Test with all modules present in version 1.2.3."""
         expected = ['sip: yes', 'colorama: 1.2.3', 'pypeg2: 1.2.3',
                     'jinja2: 1.2.3', 'pygments: 1.2.3', 'yaml: 1.2.3',
-                    'cssutils: 1.2.3', 'typing: yes',
+                    'cssutils: 1.2.3', 'typing: yes', 'OpenGL: 1.2.3',
                     'PyQt5.QtWebEngineWidgets: yes',
                     'PyQt5.QtWebKitWidgets: yes']
         assert version._module_versions() == expected
@@ -579,17 +580,17 @@ class TestModuleVersions:
     @pytest.mark.parametrize('value, expected', [
         ('VERSION', ['sip: yes', 'colorama: 1.2.3', 'pypeg2: yes',
                      'jinja2: yes', 'pygments: yes', 'yaml: yes',
-                     'cssutils: yes', 'typing: yes',
+                     'cssutils: yes', 'typing: yes', 'OpenGL: yes',
                      'PyQt5.QtWebEngineWidgets: yes',
                      'PyQt5.QtWebKitWidgets: yes']),
         ('SIP_VERSION_STR', ['sip: 1.2.3', 'colorama: yes', 'pypeg2: yes',
                              'jinja2: yes', 'pygments: yes', 'yaml: yes',
-                             'cssutils: yes', 'typing: yes',
+                             'cssutils: yes', 'typing: yes', 'OpenGL: yes',
                              'PyQt5.QtWebEngineWidgets: yes',
                              'PyQt5.QtWebKitWidgets: yes']),
         (None, ['sip: yes', 'colorama: yes', 'pypeg2: yes', 'jinja2: yes',
                 'pygments: yes', 'yaml: yes', 'cssutils: yes', 'typing: yes',
-                'PyQt5.QtWebEngineWidgets: yes',
+                'OpenGL: yes', 'PyQt5.QtWebEngineWidgets: yes',
                 'PyQt5.QtWebKitWidgets: yes']),
     ])
     def test_version_attribute(self, value, expected, import_fake):