Tried to run Humus''s Portals Demo, it uses GLSL (GL Shading Language), on my ATI 9600 XT, but got an error saying these where not present: GL_ARB_Shader_Objects GL_ARB_Vertex_Shader GL_ARB_Fragment_Shader GL_ARB_Shading_language_100 GL_ARB_occlusion_query My own engine captures a list of the extensions, and sure enough these weren''t present... ...so, does my board not support it or is it something I have to install? (a GLSL package maybe, or get better drivers from ATI)... Also, what are you guys using for shading (vertex and fragment), cause I''m having problems implementing either Cg, which is lame on ATI cards, or GLSL... Thanks for any input on this [Hugo Ferreira][Positronic Dreams][Colibri 3D Engine][Entropy HL2 MOD][My DevDiary]
[Yann L.][Enginuity] [Penny Arcade] [MSDN][VS RoadMap][Humus][BSPs][UGP][NeHe]
Prozak - The GameDever formally known as pentium3id

Ok, got the newest drivers from ATI and GLSL and all the previous extensions seem to be available now.

I installed the "vanilla" drivers that came in the CD with the board, so I guess that was one of the problems...

[Hugo Ferreira][Positronic Dreams][Colibri 3D Engine][Entropy HL2 MOD][My DevDiary]
[Yann L.][Enginuity] [Penny Arcade] [MSDN][VS RoadMap][Humus][BSPs][UGP][NeHe]
Prozak - The GameDever formally known as pentium3id

yeah i''m not sure about your card.
I got a geoforce fx 5950 and it doesn''t support any of the opengl 2.0 extensions.
My radeon 9700 didn''t either until I updated to latest catalyst drivers that just came out.
I''d use glview to test your card



If God played dice, He''d win.
—Ian Stewart, Does God Play Dice? The Mathematics of Chaos

All ATI DirectX9 cards (9500 and up) support OGSL. nVidias'' cards don''t support OGSL yet.


"C lets you shoot yourself in the foot rather easily. C++ allows you to reuse the bullet!"

Ok so:
GLSL - not supported by nvidia cards yet
Cg - partially supported under ATI cards, but you lose a lot of the advanced features
HLSL - not an OpenGL option...

isnt there a tool that will compile vertex and fragment shaders into assembly code to be used under diferent profiles, and you select a profile for a certain hardware configuration? pretty much all equal to Cg, besides the fact that Cg doesnt expose its assembly generated code...

Someone at sourceforge must be working on this...

[Hugo Ferreira][Positronic Dreams][Colibri 3D Engine][Entropy HL2 MOD][My DevDiary]
[Yann L.][Enginuity] [Penny Arcade] [MSDN][VS RoadMap][Humus][BSPs][UGP][NeHe]
Prozak - The GameDever formally known as pentium3id

quote:Original post by Prozak
Ok so:
GLSL - not supported by nvidia cards yet
Cg - partially supported under ATI cards, but you lose a lot of the advanced features
HLSL - not an OpenGL option...

There is, apparently, a way of accessing GLSL through nvidia drivers by changing registry values, although my understanding is that they're at a much earlier stage than ATi's implementation.

With Cg, you can use it with ATi as long as you compile to use the ARB_FP/ARB_VP profiles. AFAIK, the only "advanced feature" you can't use is halfs (16-bit floats), which are treated as full floats (24 bits on ATi) with ARB_VP/FP.

quote:
isnt there a tool that will compile vertex and fragment shaders into assembly code to be used under diferent profiles, and you select a profile for a certain hardware configuration? pretty much all equal to Cg, besides the fact that Cg doesnt expose its assembly generated code...

I don't think you could emulate the GLSL entirely this way, because you'd lose the ability to connect chains of shaders together. Having said that, I'm not entirely sure how this works internally, so I could be wrong.

Oh and BTW, Cg does expose its assembly generated code. You just have to use the Cg compiler (bin\cgc.exe) rather than the runtime library. In my project I'm using Cg at the build stage to compile the shaders into ARB_FP/ARB_VP programs; this is a pain as far as named parameters are concerned (I had to write my own shader framework to handle this), but it means the shaders are already compiled at runtime, and I don't need the extra lib.

[edited by - benjamin bunny on March 18, 2004 3:11:44 PM]

[HKEY_LOCAL_MACHINE\SOFTWARE\NVIDIA Corporation\Global\OpenGL\Debug]"ShaderObjects"=dword:00000001 

"... we should have such an empire for liberty as she has never surveyed since the creation ..."
Thomas Jefferson

quote:Original post by benjamin bunny With Cg, you can use it with ATi as long as you compile to use the ARB_FP/ARB_VP profiles. AFAIK, the only "advanced feature" you can''t use is halfs (16-bit floats), which are treated as full floats (24 bits on ATi) with ARB_VP/FP.
[edited by - benjamin bunny on March 18, 2004 3:11:44 PM]

No for loops with arbfp1


"C lets you shoot yourself in the foot rather easily. C++ allows you to reuse the bullet!"