Create OpenGL Context As Core Profile

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Swanny
Posts: 2
Joined: Wed Jun 11, 2014 8:32 am

Create OpenGL Context As Core Profile

Post by Swanny » Wed Jun 11, 2014 9:48 am

Alpha build number: 42

Operating System: Linux

Bug severity: Other

Complete steps to replicate bug: Always

Dxdiag output** or system specs for non Windows machines:
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD ARUBA

OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.3.0-devel
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions: ....

OpenGL version string: 3.0 Mesa 10.3.0-devel
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions: ....
Console output:
....
Creating Window at: 1600x1024
Creating OpenGL Context
Opengl. 3.0
Graphics: Gallium 0.4 on AMD ARUBA, X.Org
Resources//Shaders//Shaders.xml
Loading shader ScreenSpaceOcclusion
0:1(10): error: GLSL 4.10 is not supported. Supported versions are: 1.10,
1.20, 1.30, and 1.00 ES
....


Maia Config settings: Default

Other notes:

For all the Mesa open source drivers under Linux (which includes Intel, Radeon and Noveau) you need to specifically request a core profile for the OpenGL context as Mesa does not (and will never) support a compatiblity profile or GL_ARB_compatibility, otherwise you only get baseline OpenGL 3.0 and GLSL 1.30.

Since you're targeting newer systems I would assume you're not using depreciated OpenGL functions so a core context should be fine with binary drivers too?

Currently the Mesa drivers support OpenGL 3.3 and GLSL 3.30 as there is work still to be done for OpenGL 4.0 support, particularly for GL_ARB_tessellation_shader (though many extensions up to OpenGL 4.4 are supported). I understand that you're working on reducing the requirement down from GLSL 4.10 so look forward to playing the game sometime in the future.

So with SDL 2;

Code: Select all

SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);

Swanny
Posts: 2
Joined: Wed Jun 11, 2014 8:32 am

Re: Create OpenGL Context As Core Profile

Post by Swanny » Wed Jun 11, 2014 4:40 pm

Well, bugger. It appears libGLEW, as used by Maia, cannot support core profiles due to a four year old bug with patches available to replace calls to the depreciated glGetString with glGetstringi. However the maintainer, in the glew-coders mailing list indicates its a deeper limitation and he has no time (or apparently desire) to fix. The "latest" year old patch was deferred and ignored by maintainer...

Not very promising for supporting open source drivers whilst using libGLEW in Maia.

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