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239 lines
7.7 KiB
Python
239 lines
7.7 KiB
Python
# ----------------------------------------------------------------------------
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# pyglet
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# Copyright (c) 2006-2008 Alex Holkner
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of pyglet nor the names of its
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# contributors may be used to endorse or promote products
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# derived from this software without specific prior written
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# permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# ----------------------------------------------------------------------------
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'''DDS texture loader.
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Reference: http://msdn2.microsoft.com/en-us/library/bb172993.aspx
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'''
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__docformat__ = 'restructuredtext'
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__version__ = '$Id: dds.py 1579 2008-01-15 14:47:19Z Alex.Holkner $'
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from ctypes import *
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import struct
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from pyglet.gl import *
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from pyglet.gl import gl_info
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from pyglet.image import CompressedImageData
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from pyglet.image import codecs
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from pyglet.image.codecs import s3tc
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class DDSException(codecs.ImageDecodeException):
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pass
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# dwFlags of DDSURFACEDESC2
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DDSD_CAPS = 0x00000001
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DDSD_HEIGHT = 0x00000002
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DDSD_WIDTH = 0x00000004
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DDSD_PITCH = 0x00000008
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DDSD_PIXELFORMAT = 0x00001000
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DDSD_MIPMAPCOUNT = 0x00020000
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DDSD_LINEARSIZE = 0x00080000
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DDSD_DEPTH = 0x00800000
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# ddpfPixelFormat of DDSURFACEDESC2
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DDPF_ALPHAPIXELS = 0x00000001
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DDPF_FOURCC = 0x00000004
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DDPF_RGB = 0x00000040
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# dwCaps1 of DDSCAPS2
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DDSCAPS_COMPLEX = 0x00000008
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DDSCAPS_TEXTURE = 0x00001000
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DDSCAPS_MIPMAP = 0x00400000
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# dwCaps2 of DDSCAPS2
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DDSCAPS2_CUBEMAP = 0x00000200
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DDSCAPS2_CUBEMAP_POSITIVEX = 0x00000400
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DDSCAPS2_CUBEMAP_NEGATIVEX = 0x00000800
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DDSCAPS2_CUBEMAP_POSITIVEY = 0x00001000
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DDSCAPS2_CUBEMAP_NEGATIVEY = 0x00002000
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DDSCAPS2_CUBEMAP_POSITIVEZ = 0x00004000
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DDSCAPS2_CUBEMAP_NEGATIVEZ = 0x00008000
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DDSCAPS2_VOLUME = 0x00200000
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class _filestruct(object):
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def __init__(self, data):
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if len(data) < self.get_size():
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raise DDSException('Not a DDS file')
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items = struct.unpack(self.get_format(), data)
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for field, value in map(None, self._fields, items):
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setattr(self, field[0], value)
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def __repr__(self):
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name = self.__class__.__name__
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return '%s(%s)' % \
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(name, (', \n%s' % (' ' * (len(name) + 1))).join( \
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['%s = %s' % (field[0], repr(getattr(self, field[0]))) \
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for field in self._fields]))
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@classmethod
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def get_format(cls):
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return '<' + ''.join([f[1] for f in cls._fields])
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@classmethod
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def get_size(cls):
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return struct.calcsize(cls.get_format())
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class DDSURFACEDESC2(_filestruct):
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_fields = [
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('dwMagic', '4s'),
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('dwSize', 'I'),
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('dwFlags', 'I'),
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('dwHeight', 'I'),
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('dwWidth', 'I'),
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('dwPitchOrLinearSize', 'I'),
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('dwDepth', 'I'),
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('dwMipMapCount', 'I'),
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('dwReserved1', '44s'),
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('ddpfPixelFormat', '32s'),
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('dwCaps1', 'I'),
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('dwCaps2', 'I'),
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('dwCapsReserved', '8s'),
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('dwReserved2', 'I')
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]
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def __init__(self, data):
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super(DDSURFACEDESC2, self).__init__(data)
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self.ddpfPixelFormat = DDPIXELFORMAT(self.ddpfPixelFormat)
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class DDPIXELFORMAT(_filestruct):
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_fields = [
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('dwSize', 'I'),
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('dwFlags', 'I'),
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('dwFourCC', '4s'),
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('dwRGBBitCount', 'I'),
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('dwRBitMask', 'I'),
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('dwGBitMask', 'I'),
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('dwBBitMask', 'I'),
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('dwRGBAlphaBitMask', 'I')
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]
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_compression_formats = {
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('DXT1', False): (GL_COMPRESSED_RGB_S3TC_DXT1_EXT, s3tc.decode_dxt1_rgb),
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('DXT1', True): (GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, s3tc.decode_dxt1_rgba),
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('DXT3', False): (GL_COMPRESSED_RGBA_S3TC_DXT3_EXT, s3tc.decode_dxt3),
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('DXT3', True): (GL_COMPRESSED_RGBA_S3TC_DXT3_EXT, s3tc.decode_dxt3),
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('DXT5', False): (GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, s3tc.decode_dxt5),
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('DXT5', True): (GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, s3tc.decode_dxt5),
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}
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def _check_error():
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e = glGetError()
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if e != 0:
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print 'GL error %d' % e
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class DDSImageDecoder(codecs.ImageDecoder):
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def get_file_extensions(self):
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return ['.dds']
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def decode(self, file, filename):
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header = file.read(DDSURFACEDESC2.get_size())
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desc = DDSURFACEDESC2(header)
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if desc.dwMagic != 'DDS ' or desc.dwSize != 124:
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raise DDSException('Invalid DDS file (incorrect header).')
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width = desc.dwWidth
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height = desc.dwHeight
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compressed = False
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volume = False
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mipmaps = 1
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if desc.dwFlags & DDSD_PITCH:
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pitch = desc.dwPitchOrLinearSize
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elif desc.dwFlags & DDSD_LINEARSIZE:
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image_size = desc.dwPitchOrLinearSize
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compressed = True
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if desc.dwFlags & DDSD_DEPTH:
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raise DDSException('Volume DDS files unsupported')
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volume = True
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depth = desc.dwDepth
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if desc.dwFlags & DDSD_MIPMAPCOUNT:
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mipmaps = desc.dwMipMapCount
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if desc.ddpfPixelFormat.dwSize != 32:
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raise DDSException('Invalid DDS file (incorrect pixel format).')
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if desc.dwCaps2 & DDSCAPS2_CUBEMAP:
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raise DDSException('Cubemap DDS files unsupported')
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if not desc.ddpfPixelFormat.dwFlags & DDPF_FOURCC:
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raise DDSException('Uncompressed DDS textures not supported.')
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has_alpha = desc.ddpfPixelFormat.dwRGBAlphaBitMask != 0
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format = None
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format, decoder = _compression_formats.get(
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(desc.ddpfPixelFormat.dwFourCC, has_alpha), None)
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if not format:
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raise DDSException('Unsupported texture compression %s' % \
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desc.ddpfPixelFormat.dwFourCC)
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if format == GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
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block_size = 8
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else:
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block_size = 16
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datas = []
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w, h = width, height
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for i in range(mipmaps):
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if not w and not h:
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break
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if not w:
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w = 1
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if not h:
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h = 1
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size = ((w + 3) / 4) * ((h + 3) / 4) * block_size
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data = file.read(size)
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datas.append(data)
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w >>= 1
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h >>= 1
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image = CompressedImageData(width, height, format, datas[0],
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'GL_EXT_texture_compression_s3tc', decoder)
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level = 0
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for data in datas[1:]:
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level += 1
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image.set_mipmap_data(level, data)
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return image
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def get_decoders():
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return [DDSImageDecoder()]
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def get_encoders():
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return []
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