[Mesa-dev] [RFC] Change dri state tracker GetBuffersWithFormat format encoding

[Eric Anholt]

On Mon, 05 Dec 2011 15:21:57 +0100, Thomas Hellstrom <thellstrom at vmware.com> wrote:
> Hi!
> 
> Currently the DRI state tracker sends the bits per pixel (bpp) value in 
> the format member of a
> getbufferswithformat request, and assumes it can reinterpret the format 
> of the returned buffer to something else
> with an identical bpp.
> 
> That doesn't really work for vmwgfx. We can't reinterpret a surface 
> format (for example from ARGB to XRGB) and
> I would therefore like to change the dri state tracker to send the depth 
> instead of bits per pixel, so that the X server driver
> knows exactly what format it is supposed to create:
> 
> Color buffer:
> depth 32 : argb32 (bpp 32)
> depth 24 : xrgb32 (bpp 32)
> depth 16 : rgb16 (bpp 16)
> 
> Depth buffer:
> depth 32 : z32 (bpp 32)
> depth 24 : x8z24 (bpp 32)
> depth 16 : z16 (bpp 16)
> 
> Depth_Stencil buffer:
> depth 32 : s8z24: (bpp 32)

So how do you distinguish based on depth between a8r8g8b8 and r11f g11f
b10f from GLX_EXT_fbconfig_packed_float?  I would think you want enums
along the lines of MESA_FORMAT_* instead of trying to guess formats
based on a bpp/depth.
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