Cleanup i-mic-fps.rb a bit

lib/ext/load_opengl.rb

@@ -0,0 +1,35 @@
+case OpenGL.get_platform
+when :OPENGL_PLATFORM_WINDOWS
+  OpenGL.load_lib("opengl32.dll", "C:/Windows/System32")
+  GLU.load_lib("GLU32.dll", "C:/Windows/System32")
+when :OPENGL_PLATFORM_MACOSX
+  OpenGL.load_lib("libGL.dylib", "/System/Library/Frameworks/OpenGL.framework/Libraries")
+  GLU.load_lib("libGLU.dylib", "/System/Library/Frameworks/OpenGL.framework/Libraries")
+when :OPENGL_PLATFORM_LINUX
+  # Black magic to get GLSL 3.30 support on older Intel hardware
+  # if `glxinfo | egrep "OpenGL vendor|OpenGL renderer"`.include?("Intel")
+  #   ENV["MESA_GL_VERSION_OVERRIDE"] = "3.3"
+  #   ENV["MESA_GLSL_VERSION_OVERRIDE"] = "330"
+  # end
+
+  gl_library_path = nil
+
+  if File.exist?("/usr/lib/x86_64-linux-gnu/libGL.so") # Ubuntu (Debian)
+    gl_library_path = "/usr/lib/x86_64-linux-gnu"
+
+  elsif File.exist?("/usr/lib/libGL.so") # Manjaro (ARCH)
+    gl_library_path = "/usr/lib"
+
+  elsif File.exist?("/usr/lib/arm-linux-gnueabihf/libGL.so") # Raspbian (ARM/Raspberry Pi)
+    gl_library_path = "/usr/lib/arm-linux-gnueabihf"
+  end
+
+  if gl_library_path
+    OpenGL.load_lib("libGL.so", gl_library_path)
+    GLU.load_lib("libGLU.so", gl_library_path)
+  else
+    raise RuntimeError, "Couldn't find GL libraries"
+  end
+else
+  raise RuntimeError, "Unsupported platform."
+end