On 7/28/05, Geert Uytterhoeven <[EMAIL PROTECTED]> wrote: > On Thu, 28 Jul 2005, Jon Smirl wrote: > > I've verified now that all ATI R300+ chips have 10bit cmaps. These are > > pretty common so I'd be in favor of making this into a binary > > attribute where I can get/set the whole table at once. Given that > > OpenGL is already supporting 12 and 16 bits these tables are only > > going to get much larger. > > > > 1024 entries * 5 fields * 2 bytes = 10KB -- too big for a text attribute. > > > > 65536 entries * 5 fields * 2 bytes = 655KB -- way too big for a text > > attribute. > > > > The bits_per_pixel sysfs attribute is an easy way to tell how many > > entries you need. You can just set it at 4, 8, 10, etc until you get > > an error. Now you know the max. 2^n and you know how many entries. > > No, bits_per_pixel can be (much) larger than the color map size. E.g. a simple > ARGB8888 directcolor mode has bits_per_pixel = 32 and color map size = 256.
So I have the bits_per_pixel attribute wrong in sysfs. It needs to be bits_per_color and then let the driver sort it out. Otherwise there is no way to set ARGB8888 versus ARGB2101010. With bits per color you would set 8 or 10. If that isn't good enough I can switch the attribute to take strings like ARGB8888. What do you think, should I just switch to fbconfig names and a binary cmap attribute? -- Jon Smirl [EMAIL PROTECTED] - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/