+ def nr_channels(self):
+ nr_channels = 0
+ for channel in self.channels:
+ if channel.size:
+ nr_channels += 1
+ return nr_channels
+
+ def is_array(self):
+ if self.layout != PLAIN:
+ return False
+ ref_channel = self.channels[0]
+ for channel in self.channels[1:]:
+ if channel.size and (channel.size != ref_channel.size or channel.size % 8):
+ return False
+ return True
+
+ def is_mixed(self):
+ if self.layout != PLAIN:
+ return False
+ ref_channel = self.channels[0]
+ if ref_channel.type == VOID:
+ ref_channel = self.channels[1]
+ for channel in self.channels[1:]:
+ if channel.type != VOID:
+ if channel.type != ref_channel.type:
+ return True
+ if channel.norm != ref_channel.norm:
+ return True
+ return False
+
+ def is_pot(self):
+ return is_pot(self.block_size())
+
+ def is_int(self):
+ if self.layout != PLAIN:
+ return False
+ for channel in self.channels:
+ if channel.type not in (VOID, UNSIGNED, SIGNED):
+ return False
+ return True
+
+ def is_float(self):
+ if self.layout != PLAIN:
+ return False
+ for channel in self.channels:
+ if channel.type not in (VOID, FLOAT):
+ return False
+ return True
+
+ def is_bitmask(self):
+ if self.layout != PLAIN:
+ return False
+ if self.block_size() not in (8, 16, 32):
+ return False
+ for channel in self.channels:
+ if channel.type not in (VOID, UNSIGNED, SIGNED):
+ return False
+ return True
+
+ def inv_swizzles(self):
+ '''Return an array[4] of inverse swizzle terms'''
+ inv_swizzle = [None]*4
+ for i in range(4):
+ swizzle = self.swizzles[i]
+ if swizzle < 4:
+ inv_swizzle[swizzle] = i
+ return inv_swizzle
+