[Mesa-dev] r600g plans

[Jerome Glisse]

On 07/23/2010 07:11 PM, Corbin Simpson wrote:
> On Fri, Jul 23, 2010 at 3:49 PM, Jerome Glisse<glisse at freedesktop.org>  wrote:
>> Just heads up on r600g plan, i removed the compiler stuff it was getting
>> messy
>> and kind of stopped anyone else from working on other part of r600g. So now
>> there
>> is a very simple&  dumb tgsi ->  r600 assembler that does work and can run
>> glxgears
>> and couple others non textured demos. I want to freeze r600_asm* stuff as i
>> plan
>> to reuse at latter point with a proper optimizer (thought there is a couple
>> of
>> thing missing in it like splitting alu node when reaching the 256dwords
>> limit).
>> So now if you want to add opcode the only file you need to touch is
>> r600_shader.c.
>> Also i would like to avoid any kind of work on optimizing what it spit.
>>
>> I am going to add texture support over the next few days (target being
>> tri-tex,
>> multiarb, tunnel, tunnel2 at that point i think quake engine should run).
>>
>> Todo list (kind of sorted):
>> - texture support
>> - use const buffer rather than cfile
>> - avoid recompiling the shader at each draw command (would improve speed a
>>   lot)
>> - stencil support
>> - support more states (blending, alpha, rasterization, ...)
>> - geometry shader
>> - tiling support
>> - color mask support
>> - hyperz
>> - a proper compiler
>>
>> Feel free to pick something and have fun.
>
> You're awesome as usual. Can we talk about maybe some common
> optimizations to r300g and r600g (and maybe others) that can be done
> in TGSI? Code sharing is fun, and I *really* don't want to see
> features fall by the wayside just because the shader compiler needs
> work.
>
> ~ C.
>

When i first looked at optimization i looked at r300 compiler, but
thing is i want to try a different approach that would be very hard
to apply to r300-r500 hw. Basic idea is to do all optimization as
scalar, and repack the instruction after. The repacking is more or
less easy on r6xx and after but it's really tricky on r3xx-r5xx.

Cheers,
Jerome