mesa3d-dev

[Mesa3d-dev] Searching for the Depth Buffer implementation

[asimov01 <mh...@ya...>]

Hi Guys,

I am trying to implement the openGL Readpixels for depth buffer in plain
c++.  I have tried to dig into openGL for this but I think this is protected
and I think its done in hardware.  I tried to look in mesa but can't seem to
track it down.  If anyone knows which file the mesa code is in please point
me in the right direction, I would really appreciate it.  I just need to see
how mesa deals with this.

I am actually also trying to find glViewPort implementation.  I have the
math that goes with it but again want to see how mesa has implemented it.

Any help will be appreciated...


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Re: [Mesa3d-dev] Searching for the Depth Buffer implementation

[Olivier G. <gal...@po...>]

On Mon, Mar 01, 2010 at 08:22:37PM -0800, asimov01 wrote:
> I am trying to implement the openGL Readpixels for depth buffer in plain
> c++.  I have tried to dig into openGL for this but I think this is protected
> and I think its done in hardware.  I tried to look in mesa but can't seem to
> track it down.  If anyone knows which file the mesa code is in please point
> me in the right direction, I would really appreciate it.  I just need to see
> how mesa deals with this.

Mesa includes both software and hardware renderers.  For software, the
readpixels implementation is in mesa/src/mesa/swrast/s_readpix.c and
eventually calls read_depth_pixels.  For hardware support it varies,
grep for ReadPixels in mesa/src/mesa/drivers/dri/*/*.c


> I am actually also trying to find glViewPort implementation.  I have the
> math that goes with it but again want to see how mesa has implemented it.

mesa/src/main/viewport.c is probably what you're interested in.

  OG.