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Previously, Cogl was advertising the GLES2 context feature whenever the EGL winsys was used, even if the winsys was used with the GL driver. This wasn't working because when the GL context is created the API is set to GL with eglBindAPI and it is never changed back to GLES when the GLES2 context is created. That meant that the created context is actually GL not GLES2. Any rendering would then fail because the GL context does not understand the precision statement. It could be possible to fix it so that it will set the API correctly before creating the context. It would then also need to reset the API and unbind the previous context whenever switching between GLES2 and GL contexts. If the context isn't unbound first then eglMakeCurrent will actually try to bind both contexts at the same time and at least Mesa detects this situation and reports that the two contexts conflict. Presumably we would also need to do something more clever when we retrieve the function pointers for the GLES2 context. Currently we just copy them from the CoglContext but if the context is using the GL driver then this would mean the functions came from libGL not libGLESv2. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit 624dea207cf76ae9ccd7f57c4ebd15d3bd65bff0)