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import pytest
from vispy.gloo.gl import use_gl
@pytest.fixture(params=['points', 'instanced'])
def rendering_method(request):
"""Setup rendering method for test function, skip if backend unavailable.
Tests that accept this fixture will run twice: once with 'points' method
(gl2) and once with 'instanced' method (gl+).
"""
method = request.param
if method == 'instanced':
try:
use_gl('gl+')
except Exception:
pytest.skip("gl+ backend not available for instanced rendering")
else:
use_gl('gl2')
yield method
# Reset to gl2 after test
use_gl('gl2')
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