add ETC1 support to fb/mipcube demo, figure out supertiling

Also figure out some other resolve state.
Add a tool (genmipmaps_etc1.py) to generate a dds file with ETC1 texture
compression and auto-generate mipmaps (GIMP dds plugin cannot do ETC1).

1 files changed, 94 insertions, 0 deletions

diff --git a/tools/genmipmaps_etc1.py b/tools/genmipmaps_etc1.py
new file mode 100755
index 0000000..2da1653
--- /dev/null
+++ b/tools/genmipmaps_etc1.py
@@ -0,0 +1,94 @@
+#!/usr/bin/python
+'''
+Generate 'ETC1' texture with mipmaps in dds format from an image file.
+'''
+# Copyright (c) 2012-2013 Wladimir J. van der Laan
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sub license,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice (including the
+# next paragraph) shall be included in all copies or substantial portions
+# of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+# DEALINGS IN THE SOFTWARE.
+from __future__ import print_function, division, unicode_literals
+import struct, sys, PIL, os
+from PIL import Image
+import argparse, tempfile
+from subprocess import call
+
+DDS_MAGIC = 0x20534444
+DDS_UINT32 = b'<I'
+FOURCC_ETC1 = struct.unpack(DDS_UINT32, b'ETC1')[0] # custom FOURCC
+ETC1TOOL = 'etc1tool' # Android ETC1 tool, needs to be in PATH
+
+def main():
+    parser = argparse.ArgumentParser(description='Generate mipmaps from image and compress to ETC1 dds.')
+    parser.add_argument('input', metavar='INFILE', type=str, 
+            help='Input file (usually .png or .jpg)')
+    parser.add_argument('output', metavar='OUTFILE', type=str, 
+            help='Output file (.dds)')
+    args = parser.parse_args()
+
+    img = Image.open(args.input)
+    orig_width = width = img.size[0]
+    orig_height = height = img.size[1]
+    assert(width > 0 and height > 0)
+
+    (fd, tmpout) = tempfile.mkstemp(suffix='.png')
+    os.close(fd) # won't be using the already-opened fd
+    (fd, tmpout2) = tempfile.mkstemp(suffix='.pkm')
+    os.close(fd)
+    mip = 0
+    mips = []
+    while True:
+        print('Generating mip %i: %ix%i' % (mip, width, height))
+        img.save(tmpout)
+        call([ETC1TOOL, '--encodeNoHeader', tmpout, '-o', tmpout2])
+
+        with open(tmpout2, 'rb') as f:
+            data = f.read()
+        print('  compressed size: %i' % len(data))
+        mips.append(data)
+      
+        # Go to next mip level
+        if width == 1 and height == 1: # 1x1 reached
+            break
+        width = (width+1) >> 1
+        height = (height+1) >> 1
+        mip += 1
+        img = img.resize((width, height), PIL.Image.ANTIALIAS)
+
+    with open(args.output, 'wb') as f:
+        # Write dds header
+        hdrdata = [0] * (128//4)
+        hdrdata[0] = DDS_MAGIC # dwMagic
+        hdrdata[1] = 124 # dwSize
+        hdrdata[2] = 0x000A1007 # dwFlags (CAPS, WIDTH, HEIGHT, PIXELFORMAT, MIPMAPCOUNT, LINEARSIZE)
+        hdrdata[3] = orig_height # dwHeight
+        hdrdata[4] = orig_width # dwWidth
+        hdrdata[5] = len(mips[0]) # dwPitchOrLinearSize
+        hdrdata[6] = 0 # dwDepth
+        hdrdata[7] = len(mips) # dwMipMapCount
+        hdrdata[19] = 32 # sPixelFormat.dwSize
+        hdrdata[20] = 4 # sPixelFormat.dwFlags = DDPF_FOURCC
+        hdrdata[21] = FOURCC_ETC1 # sPixelFormat.dwFourCC
+        hdrdata[27] = 0x00401008 # sCaps.dwCaps1 (COMPLEX, TEXTURE, MIPMAP)
+        f.write(struct.pack(b'<32I', *hdrdata))
+        for mip in mips:
+            f.write(mip)
+
+if __name__ == '__main__':
+    main()
+