adding new files

python/tests/test_compress_swirl.py

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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)