[MACOS] Build is ok but shader problems in sample-gui

[dcoeurjo]

The Qt windows is ok but the OpenGL widget fails at some points and nothing is displayed.

[dcoeurjo]

Here you have the shader issues:

QGLShader::compile(Vertex): ERROR: 0:1: '' :  version '330' is not supported
QGLShader::compile(Fragment): ERROR: 0:1: '' :  version '330' is not supported
....

[fwachtel]

The rendering of the elements in the draw area are done with GLSL. And we use a quite new version of it ('330').
Maybe we need to rewrite the shaders in a previous language version for better compatibility.

[fwachtel]

Same error on my laptop that have an integrated Intel hd 3000 gpu. (ubuntu 14.04)
Support until 1.30 or 3.00 ES.