A PsVIta swizzled 2d texture
Posted: Wed Apr 19, 2017 4:14 pm
I am playing around with the textures of a NIS PsVita game, and I could see all of them are swizzled.
I could unswizzled them using a modified code from viewtopic.php?f=18&t=2640&hilit=UnSwizzle
But there are some kind of files I dont get completely well.
One of them is this one:
https://drive.google.com/file/d/0B2552r ... sp=sharing
And I get this wrong PNG. To see why is wrong, just do zooming in.
https://drive.google.com/file/d/0B2552r ... sp=sharing
Maybe my code is wrong or I need another unswizzling code. I have done a lot of tests but I dont get a right image of this texture.
The working code is this, maybe it could be useful for someone else:
I could unswizzled them using a modified code from viewtopic.php?f=18&t=2640&hilit=UnSwizzle
But there are some kind of files I dont get completely well.
One of them is this one:
https://drive.google.com/file/d/0B2552r ... sp=sharing
And I get this wrong PNG. To see why is wrong, just do zooming in.
https://drive.google.com/file/d/0B2552r ... sp=sharing
Maybe my code is wrong or I need another unswizzling code. I have done a lot of tests but I dont get a right image of this texture.
The working code is this, maybe it could be useful for someone else:
Code: Select all
import os
import png
#Set to false for yx swizzle order
xy = False
def chunks(l, n):
for i in range(0, len(l), n):
yield l[i:i + n]
def unswizzle(writebuf, readbuf, writeoffset, segwidth, segheight, datawidth):
global readoffset, buffer
if segwidth == 2 and segheight == 2:
if xy:
writebuf[writeoffset:writeoffset + 2] = readbuf[readoffset:readoffset + 2]
writebuf[writeoffset + datawidth:writeoffset + datawidth + 2] = readbuf[readoffset + 2:readoffset + 4]
else:
writebuf[writeoffset] = readbuf[readoffset]
writebuf[writeoffset + datawidth] = readbuf[readoffset + 1]
writebuf[writeoffset + 1] = readbuf[readoffset + 2]
writebuf[writeoffset + datawidth + 1] = readbuf[readoffset + 3]
readoffset += 4
else:
if xy:
unswizzle(writebuf, readbuf, writeoffset, segwidth // 2, segheight // 2, datawidth)
unswizzle(writebuf, readbuf, writeoffset + segwidth // 2, segwidth // 2, segheight // 2, datawidth)
unswizzle(writebuf, readbuf, writeoffset + datawidth * (segheight // 2), segwidth // 2, segheight // 2,
datawidth)
unswizzle(writebuf, readbuf, writeoffset + datawidth * (segheight // 2) + segwidth // 2, segwidth // 2,
segheight // 2, datawidth)
else:
unswizzle(writebuf, readbuf, writeoffset, segwidth // 2, segheight // 2, datawidth)
unswizzle(writebuf, readbuf, writeoffset + datawidth * (segheight // 2), segwidth // 2, segheight // 2,
datawidth)
unswizzle(writebuf, readbuf, writeoffset + segwidth // 2, segwidth // 2, segheight // 2, datawidth)
unswizzle(writebuf, readbuf, writeoffset + datawidth * (segheight // 2) + segwidth // 2, segwidth // 2,
segheight // 2, datawidth)
def vita2bitmap(fileName1, width, height):
global readoffset, bufferz
if width == height:
unswizzle(buffer, bitmap, 0, width, height, width)
elif width > height:
for w in range(0, width, height):
unswizzle(buffer, bitmap, w, height, height, width)
elif height > width:
for h in range(0, height * width, width ** 2):
unswizzle(buffer, bitmap, h, width, width, width)
else:
print('error')
p = list(chunks(buffer, width))
with open(fileName1, 'wb') as f:
w = png.Writer(len(p[0]), len(p), greyscale=True)
w.write(f, p)
fileName = "1ch6020.BTM"
#This file has not palette
paletteSize = 0
#In this case, all the file is bitmap
bitmapSize = os.path.getsize(fileName)
width = 1024
height = 1024
fileName1 = fileName.rsplit(".", 1)[0] + ".png"
with open(fileName, 'rb') as f:
palette = f.read(paletteSize)
bitmap = f.read(bitmapSize)
buffer = bytearray(len(bitmap)) #Output buffer
readoffset = 0 #Input position counter
vita2bitmap(fileName1, width, height)
