How to create OpenGL ES 2 context on Desktop?

Manmohan Bishnoi Published at Dev

Manmohan Bishnoi

Is it possible to create OpenGL ES 2 context on desktop linux?

My context related code is like this:

int context_attribs[] =
      {
        GLX_CONTEXT_MAJOR_VERSION_ARB, 4,
        GLX_CONTEXT_MINOR_VERSION_ARB, 5,
        GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_ES2_PROFILE_BIT_EXT,
        None
      };

    ctx = glXCreateContextAttribsARB( display, bestFbc, 0,
                                      True, context_attribs );

But it fails.

However this succeeds:

int context_attribs[] =
          {
            GLX_CONTEXT_MAJOR_VERSION_ARB, 4,
            GLX_CONTEXT_MINOR_VERSION_ARB, 5,
            GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
            None
          };

What am I doing wrong here?

I am trying to do this on Fedora 22 x86_64 with NVIDIA GTX 750 Ti GPU.

UPDATE

Here's the working code to create OpenGL ES 2.0 context based on answer below:

https://github.com/manmohanbishnoi/my-experiments/blob/master/OpenGL%20ES%20context%20on%20Desktop/opengl_es2.c

derhass

You are requesting an OpenGL ES version 4.5 context, which does not exist. From the GLX_EXT_create_context_es2_profile extension spec:

If the version requested is a valid and supported OpenGL-ES version, and the GLX_CONTEXT_ES_PROFILE_BIT_EXT bit is set in the GLX_CONTEXT_PROFILE_MASK_ARB attribute (see below), then the context returned will implement the OpenGL ES version requested.

The GLX_CONTEXT_ES2_PROFILE_BIT_EXT is actually kind of a red herring:

Version 3, 2012/03/28

Add support for any OpenGL-ES version, not just version 2.0. Alias GLX_CONTEXT_ES2_PROFILE_BIT_EXT with GLX_CONTEXT_ES_PROFILE_BIT_EXT and the extension name GLX_EXT_create_context_es2_profile with GLX_EXT_create_context_es_profile.

So it doesn't select a version at all in a profile, version and profile are working orthogonally...

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