[require]
GLSL >= 1.50
GL_ARB_fragment_layer_viewport

[vertex shader passthrough]

[geometry shader]
#version 150

layout(triangles) in;
layout(triangle_strip, max_vertices=3) out;
uniform int layer;

void main()
{
	for (int i = 0; i < 3; i++) {
		gl_Position = gl_in[i].gl_Position;
		gl_Layer = layer;
		EmitVertex();
	}
}

[fragment shader]
#version 150
#extension GL_ARB_fragment_layer_viewport: require

uniform int layer;

void main()
{
	if (gl_Layer == layer)
		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 layer 0
draw rect -1 -1 1 1

uniform int layer 1
draw rect 0 -1 1 1

uniform int layer 10000
draw rect -1 0 1 1

uniform int layer -10000
draw rect 0 0 1 1

probe all rgb 0.0 1.0 0.0