Add pure-Python create_bump_LUT function

korman/exporter/material.py

@@ -276,7 +276,7 @@ class MaterialConverter:
         dv_layer.UVWSrc = du_uv + 1
 
         if self._bumpLUT is None:
-            self._bumpLUT = plMipmap("BumpLutTexture")
+            self._bumpLUT = plMipmap("BumpLutTexture", 16, 16, 1, plBitmap.kUncompressed, plBitmap.kRGB8888)
             GLTexture.create_bump_LUT(self._bumpLUT)
 
             page = self._mgr.get_textures_page(du_layer.key)

korman/korlib/texture.py

@@ -186,3 +186,41 @@ class GLTexture:
         func = mipmap.CompressImage if compression == plBitmap.kDirectXCompression else mipmap.setLevel
         for i, level in enumerate(data):
             func(i, level)
+
+
+    @staticmethod
+    def create_bump_LUT(mipmap):
+        kLUTHeight = 16
+        kLUTWidth = 16
+
+        buf = bytearray(kLUTHeight * kLUTWidth * 4)
+
+        denom = kLUTWidth - 1
+        delH = (kLUTHeight - 1) // 5
+        startH = delH // 2 + 1
+        doneH = 0
+
+        doneH = startH * kLUTWidth * 4
+        buf[0:doneH] = [b for x in range(kLUTWidth) for b in [0, 0, int((x / denom) * 255.9), 255]] * startH
+
+        startH = doneH
+        doneH += delH * kLUTWidth * 4
+        buf[startH:doneH] = [b for x in range(kLUTWidth) for b in [127, 127, int((x / denom) * 255.9), 255]] * delH
+
+        startH = doneH
+        doneH += delH * kLUTWidth * 4
+        buf[startH:doneH] = [b for x in range(kLUTWidth) for b in [0, int((x / denom) * 255.9), 0, 255]] * delH
+
+        startH = doneH
+        doneH += delH * kLUTWidth * 4
+        buf[startH:doneH] = [b for x in range(kLUTWidth) for b in [127, int((x / denom) * 255.9), 127, 255]] * delH
+
+        startH = doneH
+        doneH += delH * kLUTWidth * 4
+        buf[startH:doneH] = [b for x in range(kLUTWidth) for b in [int((x / denom) * 255.9), 0, 0, 255]] * delH
+
+        startH = doneH
+        doneH += delH * kLUTWidth * 4
+        buf[startH:doneH] = [b for x in range(kLUTWidth) for b in [int((x / denom) * 255.9), 127, 127, 255]] * startH
+
+        mipmap.setRawImage(bytes(buf))