#version 450
layout(location = 0) out vec4 FragColor;
layout(location = 0) in vec4 v0;
void main()
{
FragColor = vec4(1.0);
for (int i = 0; i < 4; i++)
if (v0.x == 20.0)
FragColor += vec4(v0[i & 3]);
}
else
FragColor += vec4(v0[i & 1]);