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Bug 2206

Summary: GLES2 context creation fails in x11 since 2.0.1
Product: SDL Reporter: Carles Pagès <carles.pages>
Component: videoAssignee: Gabriel Jacobo <gabomdq>
Status: RESOLVED INVALID QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: 2.0.1   
Hardware: x86_64   
OS: Linux   
Attachments: Fixed test file

Description Carles Pagès 2013-11-03 16:21:38 UTC 
Since SDL 2.0.1 gles2 context creation fails under x11.

I used the following code to reproduce the failure: http://sprunge.us/AJHe

I'm not sure if this is relevant, but this is on a laptop with an intel gm965 card.

I tracked down the change of behaviour to changeset 7659 (http://hg.libsdl.org/SDL/diff/ac4ce59c40e7/src/video/x11/SDL_x11opengl.c). Before, there was code to internally use the gles functions to create the context if SDL_GL_CONTEXT_EGL was set. Now, this decision is based on HAS_GLX_EXT_create_context_es2_profile, which is true in my system. So, X11_GL_CreateContext is used to try to create the gles context but it fails, specifically the last call to glXCreateContextAttribs returns null (with these attribs):
(gdb) print attribs
$4 = {8337, 2, 8338, 1, 37158, 4, 0, 0, 0}

I don't know how to further debug this, but a workaround would be to use again the gles internal functions to create the context when an 'es' context is needed.
Comment 1 Gabriel Jacobo 2013-11-04 12:51:18 UTC 
Created attachment 1405 [details]
Fixed test file

Your test file fails here too. It's an easy fix though. See attached file.

(You didn't set the minor version for the context, and using SDL_GL_CONTEXT_EGL is deprecated).
Comment 2 Gabriel Jacobo 2013-11-04 12:51:43 UTC 
Marking as invalid, feel free to reopen if this isn't the case.