On Mon, 19 Dec 2011 11:44:51 -0700, Brian Paul wrote:
On Mon, Dec 19, 2011 at 11:18 AM, Alexander von Gluck
<kallis...@unixzen.com> wrote:
Good afternoon!
The Haiku OS project (not-for-profit organization, founded in 2001)
has
found ourselves in a weird spot, we have a working Mesa software
render library based on a *heavily* modified Mesa 7.4.4.
http://cgit.haiku-os.org/haiku/tree/src/libs/mesa
However as you can imagine, updating that is going to be a *big*
pain point. As Haiku is looking to get some basic 3D rendering
going on it's cards, we need to do upgrade to a newer version of
Mesa.
If we produced well thought out Haiku OS support patches, would
Mesa as a project be interested in accepting them upstream? I think
a better direction may be to move away from the heavily custom
integrated mesa library and move to stock version.
These patches would likely start as run-of-the-mill #ifdef __HAIKU__
macros.
As Haiku has a much smaller developer base then Mesa (20-30
commiters)
these first steps would greatly assist us in getting hardware
assisted
3d acceleration going.
Keep in mind this is all early analysis, I haven't tried porting
7.11.2
yet :)
In general I'm happy to take patches for Haiku. But I wouldn't want
to see #ifdef __HAIKU__ lines scattered all over the code.
Hopefully,
that can be limited to header files as with other platforms.
What GPUs/cards do you need to support? Does this involve restoring
any legacy drivers that were removed a few weeks ago? Could you move
to Gallium-based drivers?
We are mostly looking for Radeon HD and Intel at the moment (because
they
represent the newest chipsets we support at the moment) It does not
involve
restoring the legacy drivers.
We want to make sure we support do things correctly to minimize Mesa
impact / work, while keeping to the Haiku (aka BeOS) method of graphic
driver design as much as possible.
Example, in order from top to bottom:
Kernel space graphic driver
http://cgit.haiku-os.org/haiku/tree/src/add-ons/kernel/drivers/graphics/radeon_hd
User space graphic accelerant that maps graphic driver memory
http://cgit.haiku-os.org/haiku/tree/src/add-ons/accelerants/radeon_hd
User space OpenGL / 3d render that ties back to the accelerant
http://cgit.haiku-os.org/haiku/tree/src/add-ons/opengl
We can work on getting something working prior to providing patches, I
mostly wanted to test the waters to see how the Mesa developers felt
before
putting the work in :)
Thanks!
-- Alex
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