plib-devel

[Plib-devel] differed display lists

[Erik H. <er...@eh...>]

Hi,

For FlightGear we are hitting to a problem where ssgLeaf nodes are 
initialized in one thread and rendered in another. Normally this 
wouldn't be a problem, but when using display lists (by calling 
makeDList()) you will be executing OpenGL calls in two different threads 
now.

Are there any objections to adding a differed display list method (by 
creating a new function call useDList() that creates the display list 
for that particular leaf node the first time when the ssgVtxTable::draw 
method is called?

Erik

Re: [Plib-devel] differed display lists

[Steve B. <sjb...@ai...>]

Erik Hofman wrote:

> Are there any objections to adding a differed display list method (by 
> creating a new function call useDList() that creates the display list 
> for that particular leaf node the first time when the ssgVtxTable::draw 
> method is called?

I can't think of any obvious problems.

---------------------------- Steve Baker -------------------------
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Re: [Plib-devel] defered display lists

[Erik H. <er...@eh...>]

Steve Baker wrote:
> Erik Hofman wrote:
> 
>> Are there any objections to adding a defered display list method (by 
>> creating a new function call useDList() that creates the display list 
>> for that particular leaf node the first time when the 
>> ssgVtxTable::draw method is called?
> 
> 
> I can't think of any obvious problems.

Ok, here is the patch.

Erik

Re: [Plib-devel] defered display lists

[Erik H. <er...@eh...>]

Erik Hofman wrote:
> Steve Baker wrote:
> 
>> Erik Hofman wrote:
>>
>>> Are there any objections to adding a defered display list method (by 
>>> creating a new function call useDList() that creates the display list 
>>> for that particular leaf node the first time when the 
>>> ssgVtxTable::draw method is called?
>>
>>
>>
>> I can't think of any obvious problems.
> 
> 
> Ok, here is the patch.

Oops, I noticed a problem with this one:


>  #ifdef _SSG_USE_DLIST
> +  if ( generate_dlist )
> +  {
> +    makeDList () ;
> +    generate_dlist = 0 ;

These two lines have to be inverted.


>  #ifdef _SSG_USE_DLIST
> +  if ( generate_dlist )
> +  {
> +    makeDList () ;
> +    generate_dlist = 0 ;

Just like these.


Erik

Re: [Plib-devel] defered display lists

[Erik H. <er...@eh...>]

I've been busy with the latest release of FlightGear, but here is an 
updated patch.

It would be nice if the proposed patches get included in plib a some 
point since most of the binary releases of FlightGear are now build 
using a patched version of the latest CVS version of plib.

Erik

BTW. This patch isn't really necessary for FlightGear anymore, but it 
might be helpful for other projects as well.