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
