emil28092005
27d238cbe6
Pass 1 renders eight plasma sheets into an atlas with linear depth in alpha; pass 2 marches the refracted ray to each sheet and absorbs it by real path length, so near and far layers separate under pointer parallax. Plasma cycle repeats exactly every 30 s; - / = change speed.
47 lines
2.1 KiB
Python
47 lines
2.1 KiB
Python
#!/usr/bin/env python3
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"""Render regression checks. Requires Firefox and Pillow; the page itself needs neither."""
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import subprocess
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import tempfile
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import unittest
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from pathlib import Path
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from PIL import Image, ImageChops, ImageStat
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HERE = Path(__file__).resolve().parent
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class IceRenderTest(unittest.TestCase):
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def test_loop_mouse_and_visible_plasma(self):
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subprocess.run(['python3', str(HERE / 'build_plasma.py')], check=True)
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with tempfile.TemporaryDirectory() as directory:
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root = Path(directory)
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profile = root / 'profile'
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profile.mkdir()
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def render(name, parameters):
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output = root / (name + '.png')
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url = (HERE / 'ice_plasma.html').as_uri() + '#shot&' + parameters
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subprocess.run(['firefox', '--headless', '--new-instance', '--profile', str(profile),
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'--window-size=320,240', '--screenshot=' + str(output), url],
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check=True, timeout=120, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
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# Exclude the on-screen instructions.
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with Image.open(output) as image:
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return image.convert('RGB').crop((0, 0, 320, 180))
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start = render('start', 't=0&mx=0.5&my=0.5')
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loop = render('loop', 't=30&mx=0.5&my=0.5')
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moved = render('moved', 't=0&mx=0.9&my=0.5')
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halfway = render('halfway', 't=15&mx=0.5&my=0.5')
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difference = lambda a, b: sum(ImageStat.Stat(ImageChops.difference(a, b)).mean) / 3
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self.assertLess(difference(start, loop), 1.0)
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self.assertGreater(difference(start, moved), 3.0)
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self.assertGreater(difference(start, halfway), 3.0)
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self.assertGreater(ImageStat.Stat(start).stddev[2], 10.0)
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luminance = start.convert('L').histogram()
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pixels = sum(luminance)
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self.assertLess(sum(luminance[:20]) / pixels, 0.10) # No vast black voids.
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self.assertGreater(sum(luminance[:35]) / pixels, 0.08) # The depth stays dark.
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if __name__ == '__main__':
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unittest.main()
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