void Shader::setParameter(const std::string& name, float* x, int c = 1)
{
    if (m_shaderProgram)
    {
        ensureGlContext();

        // Enable program
        GLhandleARB program = glGetHandleARB(GL_PROGRAM_OBJECT_ARB);
        glCheck(glUseProgramObjectARB(m_shaderProgram));

        // Get parameter location and assign it new values
        GLint location = glGetUniformLocationARB(m_shaderProgram, name.c_str());
        if (location != -1)
            glCheck(glUniformMatrix4fvARB(location, c, GL_FALSE, x));
        else
            err() << "Parameter \"" << name << "\" not found in shader" << std::endl;

        // Disable program
        glCheck(glUseProgramObjectARB(program));
    }
}