EGL_MESA_screen_surface proposal

[Michel Danzer]

On Wed, 2005-03-16 at 14:23 -0500, Jon Smirl wrote:
> On Wed, 16 Mar 2005 12:15:15 -0700, Brian Paul
> <brian.paul at tungstengraphics.com> wrote:
> > > Color depth is an independent variable to the mode.
> > 
> > Is it?  I remember video cards that could support 1024x768 with 24-bit
> > color but 1600x1200 only with 8-bit color.  Was that because of
> > limited DAC bandwidth or the limited amount of VRAM?
> 
> That is a hardware limit. If you have a 1600x1200 mode set and you try
> to use a 24b surface you should get an error saying bandwidth
> exceeded. The problem is that 1600x1200-24 outputs at something like
> 150Mhz and your monitor can only take 120Mhz.

Minor correction: the pixel clock doesn't scale with the bit depth, but
the DAC memory bandwidth does.


-- 
Michel Danzer, Linux Software Engineering       \   Tel: +1 905-882-2600
ATI Technologies Inc., Markham, Ontario, Canada  \       Extension: 3550