[require]
GLSL >= 1.10

[vertex shader]
vec4 y_adjust(vec4 pos)
{
	vec4 x;

	if (pos.x > 0.0)
		x = vec4(-0.5, 0.0, 0.0, 0.0);
	else
		x = vec4(1.5, 0.0, 0.0, 0.0);

	if (pos.y > 0.0)
		return vec4(0.0, -0.5, 0.5, 0.0) + x;
	else
		return vec4(0.0, 1.5, 0.5, 0.0) + x;
}

void main()
{
	gl_FrontColor = gl_Vertex + y_adjust(gl_Vertex);
	gl_Position = gl_Vertex;
}

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

[test]
draw rect -1 -1 2 2
probe all rgb 0.5 0.5 0.5 0.5