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GLSL issues

Started by swiftcoder Feb 26, 2008 at 6:55 AM 2 replies 700+ views

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swiftcoder

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2,296

swiftcoder

Feb 26, 2008 at 6:55 AM

I have one query and one problem, hopefully you can answer both [smile] Firstly, glUseProgram(0) is not disabling shaders in my game. Any ideas on issues that could cause this/problems to look for? I have made sure that gluseprogram(0) is actually being called, and I can tell it is not disabled because I am rendering some fixed function geometry right after, which is inheriting the previously active program. (Never mind, I was re-enabling the last program by mistake) Secondly, in debugging this I decided to output all my program and shader handles, with this interesting result:

program:  1
shader:  2
shader:  3
program:  4
shader:  5
shader:  6

Is it entirely normal that my driver is using the same namespace for programs as for shaders? [Edited by - swiftcoder on February 26, 2008 8:18:55 AM]

polymorphed

Feb 26, 2008 at 8:25 AM

Yes, that's normal.
A shader is basically independent until you add it to a program, and you can reuse it in other programs if you wish, so it's vital that everything has its own handle to avoid conflicts. [smile]

swiftcoder

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swiftcoder

Feb 26, 2008 at 8:58 AM

Quote:
Original post by polymorphed
Yes, that's normal.
A shader is basically independent until you add it to a program, and you can reuse it in other programs if you wish, so it's vital that everything has its own handle to avoid conflicts. [smile]

I understand that, but in what case could a shader handle ever conflict with a program handle?

_the_phantom_

496

_the_phantom_

Feb 26, 2008 at 9:19 AM

Never; the driver will handle the allocation of IDs as it sees fit. The number is effectively meaningless and could very well change between driver revisions and vendors (AMD for example allocates program and shader object at very high numbers, or at least did when I last checked).

In short, don't worry about it and just trust in the driver...

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