GLSL

William Finlayson · Post by **William Finlayson** » Mon Feb 21, 2005 6:52 pm

There seems to be talk of getting high-level OpenGL shader support through Cg. Why not use the official GLslang extensions instead? It looks like it could be integrated into the Irrlicht API in the same way as HLSL. Even setting parameters by name. It will also work with ATI cards, and means that the Cg libraries wouldn't need to be added to Irrlicht. It seems like a much better solution to me, especially as it is officially part of OpenGL.

I would do this myself, but my ancient graphics card has no support for GLSL, here is a great tutorial on it though:

http://www.lighthouse3d.com/opengl/glsl/

It really shouldn't be difficult to add, and probably wouldn't need any API changes to Irrlicht, if someone could have a go at implementing it and save Niko the work, that would be great.

Jedive · Post by **Jedive** » Mon Feb 21, 2005 10:59 pm

GLSL gets my vote over Cg

vermeer · Post by **vermeer** » Tue Feb 22, 2005 8:17 am

i have a friend that uses them a lot

my card wont eat the demos u coders will make, but that's not an argument, i'll buy a new card...some day....

Joe_Oliveri · Post by **Joe_Oliveri** » Tue Feb 22, 2005 2:38 pm

GLSL is the only way to get the fully function set of OpenGL 2.0 so I think both Cg and GLSL should be included however I voted for GLSL.

niko · Post by **niko** » Wed Feb 23, 2005 12:57 pm

Hm, I didn't think about Cg vs. GLSL when I wrote 'Cg support is planned' on the front page. I think before implementing one of them, I'll check out which one will fit better. As D3D fan, I don't have any experience with both of them

But after reading this, it looks like GLSL support should be favoured over Cg.

Joe_Oliveri · Post by **Joe_Oliveri** » Wed Feb 23, 2005 8:43 pm

GLSL is rather new so it should be good. I haven't played around with it my self. Only read a few documents on it.

Murphy · Post by **Murphy** » Sun Feb 27, 2005 3:27 am

Cg would have the theoretical advantage of letting you write a shader and run it under both Direct3D and OpenGL.

Regardless, I'd be interested in implementing GLSL in Irrlicht, except that my card is a GeForce3 Ti500 -- no GL_ARB_fragment_shader.

Joe_Oliveri · Post by **Joe_Oliveri** » Sun Feb 27, 2005 3:52 am

Where do he cards start with this? Geforce FX or Geforce 4?

Murphy · Post by **Murphy** » Sun Feb 27, 2005 3:59 am

I think the first nVidia card to support GL_ARB_fragment_shader was the FX.

Joe_Oliveri · Post by **Joe_Oliveri** » Sun Feb 27, 2005 5:52 am

Thats what I thought, Just thought I should ask. Thats next on my list.

Irrlicht Engine

GLSL

Which shader solution would you prefer?

GLSL