util: Fix cross-compiles between endiannesses
The old python code used sys.is_big_endian to select between little-endian and big-endian formats, which meant that the build and host endiannesses needed to be the same. This patch instead generates both big- and little- endian layouts, using PIPE_ARCH_BIG_ENDIAN to select between them. Signed-off-by: Richard Sandiford <rsandifo@linux.vnet.ibm.com> Signed-off-by: José Fonseca <jfonseca@vmware.com>
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@ -51,7 +51,14 @@ def inv_swizzles(swizzles):
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return inv_swizzle
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def print_channels(format, func):
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func(format.channels, format.swizzles)
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if format.nr_channels() <= 1:
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func(format.le_channels, format.le_swizzles)
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else:
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print '#ifdef PIPE_ARCH_BIG_ENDIAN'
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func(format.be_channels, format.be_swizzles)
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print '#else'
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func(format.le_channels, format.le_swizzles)
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print '#endif'
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def generate_format_type(format):
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'''Generate a structure that describes the format.'''
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@ -105,7 +112,7 @@ def generate_format_type(format):
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print ' uint%u_t value;' % (format.block_size(),)
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use_bitfields = False
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for channel in format.channels:
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for channel in format.le_channels:
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if channel.size % 8 or not is_pot(channel.size):
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use_bitfields = True
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@ -129,7 +136,7 @@ def is_format_supported(format):
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return False
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for i in range(4):
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channel = format.channels[i]
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channel = format.le_channels[i]
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if channel.type not in (VOID, UNSIGNED, SIGNED, FLOAT, FIXED):
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return False
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if channel.type == FLOAT and channel.size not in (16, 32, 64):
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@ -30,8 +30,6 @@
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'''
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import sys
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VOID, UNSIGNED, SIGNED, FIXED, FLOAT = range(5)
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SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_W, SWIZZLE_0, SWIZZLE_1, SWIZZLE_NONE, = range(7)
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@ -44,9 +42,6 @@ YUV = 'yuv'
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ZS = 'zs'
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# Not cross-compiler friendly
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is_big_endian = sys.byteorder == 'big'
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def is_pot(x):
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return (x & (x - 1)) == 0
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@ -109,13 +104,15 @@ class Channel:
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class Format:
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'''Describe a pixel format.'''
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def __init__(self, name, layout, block_width, block_height, channels, swizzles, colorspace):
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def __init__(self, name, layout, block_width, block_height, le_channels, le_swizzles, be_channels, be_swizzles, colorspace):
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self.name = name
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self.layout = layout
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self.block_width = block_width
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self.block_height = block_height
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self.channels = channels
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self.swizzles = swizzles
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self.le_channels = le_channels
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self.le_swizzles = le_swizzles
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self.be_channels = be_channels
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self.be_swizzles = be_swizzles
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self.name = name
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self.colorspace = colorspace
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@ -134,13 +131,13 @@ class Format:
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def block_size(self):
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size = 0
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for channel in self.channels:
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for channel in self.le_channels:
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size += channel.size
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return size
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def nr_channels(self):
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nr_channels = 0
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for channel in self.channels:
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for channel in self.le_channels:
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if channel.size:
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nr_channels += 1
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return nr_channels
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@ -148,10 +145,10 @@ class Format:
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def array_element(self):
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if self.layout != PLAIN:
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return None
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ref_channel = self.channels[0]
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ref_channel = self.le_channels[0]
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if ref_channel.type == VOID:
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ref_channel = self.channels[1]
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for channel in self.channels:
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ref_channel = self.le_channels[1]
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for channel in self.le_channels:
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if channel.size and (channel.size != ref_channel.size or channel.size % 8):
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return None
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if channel.type != VOID:
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@ -169,10 +166,10 @@ class Format:
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def is_mixed(self):
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if self.layout != PLAIN:
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return False
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ref_channel = self.channels[0]
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ref_channel = self.le_channels[0]
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if ref_channel.type == VOID:
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ref_channel = self.channels[1]
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for channel in self.channels[1:]:
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ref_channel = self.le_channels[1]
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for channel in self.le_channels[1:]:
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if channel.type != VOID:
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if channel.type != ref_channel.type:
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return True
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@ -188,7 +185,7 @@ class Format:
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def is_int(self):
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if self.layout != PLAIN:
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return False
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for channel in self.channels:
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for channel in self.le_channels:
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if channel.type not in (VOID, UNSIGNED, SIGNED):
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return False
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return True
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@ -196,7 +193,7 @@ class Format:
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def is_float(self):
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if self.layout != PLAIN:
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return False
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for channel in self.channels:
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for channel in self.le_channels:
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if channel.type not in (VOID, FLOAT):
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return False
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return True
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@ -206,7 +203,7 @@ class Format:
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return False
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if self.block_size() not in (8, 16, 32):
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return False
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for channel in self.channels:
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for channel in self.le_channels:
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if channel.type not in (VOID, UNSIGNED, SIGNED):
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return False
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return True
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@ -215,7 +212,7 @@ class Format:
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if self.layout != PLAIN or self.colorspace == ZS:
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return False
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pures = [channel.pure
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for channel in self.channels
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for channel in self.le_channels
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if channel.type != VOID]
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for x in pures:
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assert x == pures[0]
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@ -223,7 +220,7 @@ class Format:
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def channel_type(self):
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types = [channel.type
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for channel in self.channels
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for channel in self.le_channels
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if channel.type != VOID]
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for x in types:
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assert x == types[0]
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@ -236,7 +233,7 @@ class Format:
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return self.is_pure_color() and self.channel_type() == UNSIGNED
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def has_channel(self, id):
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return self.swizzles[id] != SWIZZLE_NONE
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return self.le_swizzles[id] != SWIZZLE_NONE
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def has_depth(self):
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return self.colorspace == ZS and self.has_channel(0)
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@ -339,15 +336,25 @@ def parse(filename):
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block_width, block_height = map(int, fields[2:4])
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colorspace = fields[9]
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swizzles = [_swizzle_parse_map[swizzle] for swizzle in fields[8]]
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channels = _parse_channels(fields[4:8], layout, colorspace, swizzles)
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le_swizzles = [_swizzle_parse_map[swizzle] for swizzle in fields[8]]
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le_channels = _parse_channels(fields[4:8], layout, colorspace, le_swizzles)
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shift = 0
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for channel in channels[3::-1] if is_big_endian else channels:
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channel.shift = shift
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shift += channel.size
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be_swizzles = [_swizzle_parse_map[swizzle] for swizzle in fields[8]]
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be_channels = _parse_channels(fields[4:8], layout, colorspace, be_swizzles)
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format = Format(name, layout, block_width, block_height, channels, swizzles, colorspace)
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le_shift = 0
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for channel in le_channels:
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channel.shift = le_shift
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le_shift += channel.size
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be_shift = 0
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for channel in be_channels[3::-1]:
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channel.shift = be_shift
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be_shift += channel.size
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assert le_shift == be_shift
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format = Format(name, layout, block_width, block_height, le_channels, le_swizzles, be_channels, be_swizzles, colorspace)
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formats.append(format)
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return formats
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