[require]
geometryShader
shaderFloat64

[vertex shader]
#version 450 core
layout(location = 0) out double OutDouble;
void main() { OutDouble = 1.234; }

[geometry shader]
#version 450 core
layout(triangles) in;
layout(triangle_strip, max_vertices = 3) out;
layout(location = 0) in double InDouble[3];
layout(location = 0) out double OutDouble;
void main() {
  gl_Position = vec4(0);
  for(int i = 0; i < 3; i++) {
    OutDouble = InDouble[i];
    EmitVertex();
  }
  EndPrimitive();
}

[fragment shader]
#version 450 core
layout(location = 0) flat in double InDouble;
layout(location = 0, index = 0) out vec4 Color;
void main() { Color = float(InDouble).xxxx; }

[test]
draw arrays POINT_LIST 0 1