def init(): ''' Startup initialisation of OpenGL. ''' if gl is None: version, profile = get_profile_settings() # Initialise application-wide GL version fmt = QSurfaceFormat() fmt.setVersion(*version) # profile = QSurfaceFormat.CoreProfile if sys.platform == 'darwin' else QSurfaceFormat.CompatibilityProfile fmt.setProfile(profile or QSurfaceFormat.CompatibilityProfile) QSurfaceFormat.setDefaultFormat(fmt) if profile is not None: # Use a dummy context to get GL functions glprofile = QOpenGLVersionProfile(fmt) ctx = QOpenGLContext() globals()['gl'] = ctx.versionFunctions(glprofile) # Check and set OpenGL capabilities if not glprofile.hasProfiles(): raise RuntimeError( 'No OpenGL version >= 3.3 support detected for this system!' ) else: # If profile was none, PyQt5 is not shipped with any OpenGL function modules. Use PyOpenGL instead print( "Couldn't find OpenGL functions in Qt. Falling back to PyOpenGL" ) globals()['gl'] = importlib.import_module('OpenGL.GL') globals()['_glvar_sizes'] = { gl.GL_FLOAT: 1, gl.GL_FLOAT_VEC2: 2, gl.GL_FLOAT_VEC3: 3, gl.GL_FLOAT_VEC4: 4, gl.GL_FLOAT_MAT2: 4, gl.GL_FLOAT_MAT3: 9, gl.GL_FLOAT_MAT4: 16, gl.GL_FLOAT_MAT2x3: 6, gl.GL_FLOAT_MAT2x4: 8, gl.GL_FLOAT_MAT3x2: 6, gl.GL_FLOAT_MAT3x4: 12, gl.GL_FLOAT_MAT4x2: 8, gl.GL_FLOAT_MAT4x3: 12, gl.GL_INT: 1, gl.GL_INT_VEC2: 2, gl.GL_INT_VEC3: 3, gl.GL_INT_VEC4: 4, gl.GL_UNSIGNED_INT: 1, gl.GL_UNSIGNED_INT_VEC2: 2, gl.GL_UNSIGNED_INT_VEC3: 3, gl.GL_UNSIGNED_INT_VEC4: 4, gl.GL_DOUBLE: 1, gl.GL_DOUBLE_VEC2: 2, gl.GL_DOUBLE_VEC3: 3, gl.GL_DOUBLE_VEC4: 4, gl.GL_DOUBLE_MAT2: 4, gl.GL_DOUBLE_MAT3: 9, gl.GL_DOUBLE_MAT4: 16, gl.GL_DOUBLE_MAT2x3: 6, gl.GL_DOUBLE_MAT2x4: 8, gl.GL_DOUBLE_MAT3x2: 6, gl.GL_DOUBLE_MAT3x4: 12, gl.GL_DOUBLE_MAT4x2: 8, gl.GL_DOUBLE_MAT4x3: 12 } return gl