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