mirror of
https://github.com/BinomialLLC/basis_universal.git
synced 2026-06-08 00:23:52 +00:00
76 lines
2.2 KiB
Python
76 lines
2.2 KiB
Python
#!/usr/bin/env python3
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import numpy as np
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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 HDR swirl pattern (float32 RGBA)
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# --------------------------------------------------------------
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def make_hdr_swirl_image(w=256, h=256):
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arr = np.zeros((h, w, 4), dtype=np.float32)
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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 = (sin(dist * 0.15) * 0.5 + 0.5)
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g = (sin(angle * 3.0) * 0.5 + 0.5)
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b = (cos(dist * 0.10 + angle * 2.0) * 0.5 + 0.5)
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arr[y, x] = (r, g, b, 1.0) # full alpha
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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_hdr_swirl(backend, outfile):
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print(f"\n========== Testing HDR {backend} backend ==========")
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hdr = make_hdr_swirl_image(256, 256)
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print("Generated HDR swirl image:", hdr.shape, hdr.dtype)
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enc = Encoder(backend=backend)
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blob = enc.compress(
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hdr,
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format=-1, # auto-select HDR (UASTC_HDR_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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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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# Native backend
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try:
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compress_hdr_swirl(EncoderBackend.NATIVE, "hdr_swirl_native.ktx2")
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except Exception as e:
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print("Native HDR backend ERROR:", e)
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# WASM backend
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try:
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compress_hdr_swirl(EncoderBackend.WASM, "hdr_swirl_wasm.ktx2")
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except Exception as e:
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print("WASM HDR backend ERROR:", e)
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