[require]
GLSL >= 1.40
GL_ARB_fragment_layer_viewport
GL_AMD_vertex_shader_viewport_index

[vertex shader]
#version 140
#extension GL_AMD_vertex_shader_viewport_index: enable
in vec4 piglit_vertex;
uniform int viewport;

void main()
{
	gl_Position = piglit_vertex;
	gl_ViewportIndex = viewport;
}

[fragment shader]
#version 140
#extension GL_ARB_fragment_layer_viewport: require

uniform int viewport;

void main()
{
	if (gl_ViewportIndex == viewport)
		gl_FragColor = vec4(0,1,0,0);
	else
		gl_FragColor = vec4(1,0,0,0);
}

[test]
clear color 0.0 0.0 0.0 0.0
clear

uniform int viewport 0
draw rect -1 -1 1 1

uniform int viewport 1
draw rect 0 -1 1 1

uniform int viewport 14
draw rect -1 0 1 1

uniform int viewport 15
draw rect 0 0 1 1

probe all rgb 0.0 1.0 0.0