[require]
GLSL >= 1.10

[vertex shader]
void main()
{
  gl_Position = gl_Vertex;

  vec4 colour = vec4(0.0, 0.0, 0.0, 1.0);

  int i = 0;
  do {
      if (i == 1) {
	colour.g = 1.0;
	break;
      }
      i++;
  } while (i < 2);

  gl_FrontColor = colour;
}

[fragment shader]
void main()
{
  gl_FragColor = gl_Color;
}

[test]
clear color 0.5 0.5 0.5 0.5

draw rect -1 -1 2 2
probe all rgba 0.0 1.0 0.0 1.0