mirror of
https://github.com/BinomialLLC/basis_universal.git
synced 2026-06-08 00:23:52 +00:00
83 lines
2.3 KiB
Python
83 lines
2.3 KiB
Python
#!/usr/bin/env python3
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import numpy as np
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from PIL import Image
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from math import sin, cos, atan2, hypot
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from basisu_py.codec import Encoder, EncoderBackend
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from basisu_py.constants import BasisTexFormat, BasisQuality, BasisEffort, BasisFlags
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# --------------------------------------------------------------
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# Procedural swirl pattern (RGBA8)
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# --------------------------------------------------------------
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def make_swirl_image(w=256, h=256):
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arr = np.zeros((h, w, 4), dtype=np.uint8)
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cx = w / 2.0
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cy = h / 2.0
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for y in range(h):
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for x in range(w):
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dx = x - cx
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dy = y - cy
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dist = hypot(dx, dy)
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angle = atan2(dy, dx)
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r = int((sin(dist * 0.15) * 0.5 + 0.5) * 255)
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g = int((sin(angle * 3.0) * 0.5 + 0.5) * 255)
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b = int((cos(dist * 0.10 + angle * 2.0) * 0.5 + 0.5) * 255)
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arr[y, x] = (r, g, b, 255)
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return arr
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# --------------------------------------------------------------
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# Test encode using a given backend
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# --------------------------------------------------------------
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def compress_swirl(backend, outfile):
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print(f"\n========== Testing {backend} backend ==========")
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# Build procedural image
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swirl = make_swirl_image(256, 256)
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print("Generated swirl image:", swirl.shape)
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# Create encoder
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enc = Encoder(backend=backend)
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# Compress
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blob = enc.compress(
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swirl,
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format=BasisTexFormat.cUASTC_LDR_4x4,
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quality=BasisQuality.MAX,
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effort=BasisEffort.DEFAULT,
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flags=BasisFlags.KTX2_OUTPUT | BasisFlags.SRGB
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)
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print(f"Compressed blob size: {len(blob)} bytes")
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# Save output
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with open(outfile, "wb") as f:
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f.write(blob)
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print(f"Wrote: {outfile}")
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print("==============================================")
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# --------------------------------------------------------------
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# Main
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# --------------------------------------------------------------
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if __name__ == "__main__":
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# Test native backend
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try:
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compress_swirl(EncoderBackend.NATIVE, "swirl_native.ktx2")
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except Exception as e:
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print("Native backend ERROR:", e)
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# Test WASM backend
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try:
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compress_swirl(EncoderBackend.WASM, "swirl_wasm.ktx2")
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except Exception as e:
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print("WASM backend ERROR:", e)
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