[cairo] cairo with open GL backend

[Steve Harrington]

On 11/20/2010 02:20 PM, Luca Barbato wrote:
> On 11/19/2010 01:54 PM, guhan senthilkumar wrote:
>    
>> Oh like that. Ok Ok.. :)
>> I have driver support for my GPU..
>>
>> Do you have a working example with openGL backed.??
>> Or just please help me get started with writing the most simplest of
>> applications with cairo and openGL backend. :) :)
>>      
> http://cgit.freedesktop.org/~anholt/cairogears might help.
>
> lu
>
>    
Helps a lot. Looking at the boilerplate I thought I must have been 
mistaken to see so many raw Xlib calls but it seems that is the way this 
backend is designed to be used.

I do have one problem with cairogears however.  I get an error 
(cairogears.c line 364) when I run the program:

LD_LIBRARY_PATH=$PREFIX/lib ./cairogears -gl GRAD
error constructing context: the surface type is not appropriate for the 
operation

although the gears window is drawn but not updated if I comment out the 
exit(1) on line 367.  If this is something obvious please let me know.  
If not I'll probably run into it again as I adapt this code for my own use.

Thanks for the example.