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63474f9)
Apparently a line width of greater than 1.0 is not allowed
in some versions of OpenGL.
check_gl_error ("glGetUniformLocation");
glUniformMatrix4fv (colour_conversion, 1, GL_TRUE, gl_matrix);
check_gl_error ("glGetUniformLocation");
glUniformMatrix4fv (colour_conversion, 1, GL_TRUE, gl_matrix);
check_gl_error ("glLineWidth");
glEnable (GL_BLEND);
check_gl_error ("glEnable");
check_gl_error ("glLineWidth");
glEnable (GL_BLEND);
check_gl_error ("glEnable");