[Mesa-dev] [PATCH 0/5] Head-up display for Gallium DRI2 drivers

Vadim Girlin vadimgirlin at gmail.com
Tue Mar 26 04:18:06 PDT 2013

On 03/26/2013 02:00 AM, Marek Olšák wrote:
> On Mon, Mar 25, 2013 at 10:38 PM, Ondrej Holecek <aaannz at gmail.com> wrote:
>> On Saturday 23 of March 2013 00:50:59 Marek Olšák wrote:
>>> Hi everyone, one image is better than a thousand words:
>>> ...
>> Hi,
>> I tried your patches and hit a few problems. As first, they do not apply
>> cleanly on master as they are expecting another your patch "cso: add constant
>> buffer save/restore feature for postprocessing" to be present. But I guess you
>> are aware of that.
> Yes, I sent the patch to mesa-dev earlier.
>> Second problem is that when I build mesa with HUD on my 32bit virtual machine,
>> HUD works (with 32bit app of course). When I build it on 64bit (both are same
>> uptodate OS openSUSE 12.3), HUD is not working (with 64bit app). I managed to
>> track it down to failed IMM instruction parsing during HUD_create function. It
>> appears that translate_ctx structure in tgsi_text_translate (file
>> src/gallium/auxiliary/tgsi/tgsi_text.c) is not initialized to zeros under my
>> 64bit system, instead ctx.num_immediates is equal to 1 and hence trigger
>> "Immediates must be sorted" error.
>> Following fixes HUD for me (note that I really don't know if I am not broking
>> something here in regards to mesa):
>> diff --git a/src/gallium/auxiliary/tgsi/tgsi_text.c
>> b/src/gallium/auxiliary/tgsi/tgsi_text.c
>> index 6b97bee..247ec75 100644
>> --- a/src/gallium/auxiliary/tgsi/tgsi_text.c
>> +++ b/src/gallium/auxiliary/tgsi/tgsi_text.c
>> @@ -1577,6 +1577,7 @@ tgsi_text_translate(
>>      ctx.tokens = tokens;
>>      ctx.tokens_cur = tokens;
>>      ctx.tokens_end = tokens + num_tokens;
>> +   ctx.num_immediates = 0;
>>      if (!translate( &ctx ))
>>         return FALSE;
> I've sent a fix for this a couple of days ago:
> http://www.mail-archive.com/mesa-dev@lists.freedesktop.org/msg36038.html
>> The third issue is that on both 32bit and 64bit build fonts are not displayed
>> in HUD. I see graphs and transparent background rectangles for text but no
>> text is visible. This one I did not yet solve.
> Your driver must support the I8_UNORM texture format.

I think this also may be related to unexpected by some drivers TGSI 
declaration of vertex shader inputs:

DCL IN[0..1]

At least r600g expects the separate declaration for each input, though 
fortunately it still works in this case because parsed declarations of 
VS inputs aren't really used in r600g. I noticed exactly the same issue 
(missing text) with my r600-sb branch because it relies on the number of 
the parsed inputs from r600g's tgsi translator. It's 1 in this case 
instead of 2, so second input register is considered undefined and 
optimized away.

I suspect that some other drivers may also handle this declaration 
incorrectly and this may explain the issue.


>> One last thought, is it intentional when wrong query is entered that hud graph
>> is displayed but empty? Maybe some text like wrong query XXX would be a good
>> hint. I know it is printed on stdout but looking for warnings in chatty apps
>> like openarena is little tricky.
> Yes, it's intentional. I guess I can at least make it not draw an empty pane.
> Marek
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