Re: [osg-users] Shaders with multiple views, possible?

[Antoine Rennuit]

Sebastian, Robert, Julien,

Thanks a lot for your very clear answers, they help!

Regards,

Antoine

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Re: [osg-users] Why are my shaders not being used?

[Antoine Rennuit]

Hi Julien,

Your answer was right and your help very much appreciated!

PS: as an added note, the platform I use has a rather dull GPU and I had to 
downgrade


Code:

#define GLSL330(program) "#version 150\n" #program




to


Code:

#define GLSL330(program) "#version 130\n" #program




For it to work.

Thanks a lot,

Antoine.

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Re: [osg-users] Shaders with multiple views, possible?

[Julien Valentin]

Hi Antoine

Reasons are undertandables through osg adaptation to across openGL 
history/evolution:

In OpenGL2 there were builtins gl_XXX, in OpenGL3 these builtins have been 
removed. To make this evolution seamless osg brough you the osg_XXX uniforms 
that should be use if you're planning to deploy on GL3 core profile.

Cheers

arennuit wrote:
> Hello Robert,
> 
> Actually I don't get why OSG doubles the gl predefined variables 
> gl_ModelViewMatrix, gl_ModelViewProjectionMatrix... with osg equivalents. 
> Aren't the gl ones good enough?
> 
> Kind regards,
> 
> Antoine.


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Re: [osg-users] Shaders with multiple views, possible?

[Robert Osfield]

On 22 January 2018 at 13:58, Sebastian Messerschmidt
 wrote:
> the gl_ built-ins are not part of the core-profile and thus are not
> available in every version of GLSL.

I'll add that osg_ModelViewMatrix etc. are designed as fallbacks when
the gl_ versions aren't provided by GL-core profile and GLES2 - GLES3,

If your are just using the default GL2 profile you can happily just
use gl_ versions.  If you want to write shader code portable between
GL and GLES or beween GL and GL core profile then using the osg_
variants and telling the OSG to use these instead is done via
osg::State::set*() methods as shown in the osgsimplegl3 example.

Robert.
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Re: [osg-users] Shaders with multiple views, possible?

[Sebastian Messerschmidt]

Hi Antoine,

the gl_ built-ins are not part of the core-profile and thus are not 
available in every version of GLSL.


Cheers
Sebastian


Hello Robert,

Actually I don't get why OSG doubles the gl predefined variables 
gl_ModelViewMatrix, gl_ModelViewProjectionMatrix... with osg equivalents. 
Aren't the gl ones good enough?

Kind regards,

Antoine.

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Re: [osg-users] Shaders with multiple views, possible?

[Antoine Rennuit]

Hello Robert,

Actually I don't get why OSG doubles the gl predefined variables 
gl_ModelViewMatrix, gl_ModelViewProjectionMatrix... with osg equivalents. 
Aren't the gl ones good enough?

Kind regards,

Antoine.

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Re: [osg-users] Shaders with multiple views, possible?

[Antoine Rennuit]

Hi Julien,

I will follow Robert's advice but I keep your idea for other use cases.

Thanks!

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Re: [osg-users] Shaders with multiple views, possible?

[Antoine Rennuit]

Hello Robert,

Thanks this seems to be doing the trick ("seems" as I was not able to fully 
test yet because of some other code problem.

Regards,

Antoine

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