Test/spv.430.frag - third_party/glslang - Git at Google

 #version 430 core

 out vec4 color;

 void main()
 {
      color = vec4(1.0);
      color *= gl_Layer;
      color *= gl_ViewportIndex;
 }
	#version 430 core

	out vec4 color;

	void main()
	{
	color = vec4(1.0);
	color *= gl_Layer;
	color *= gl_ViewportIndex;
	}