[require]
GLSL >= 1.10

[vertex shader]
varying vec4 color;

void main()
{
	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
	color = vec4(-1.0, 1.0, 2.0, 0.0);
}

[fragment shader]
varying vec4 color;

void main()
{
	gl_FragColor = clamp(color, 0.0, 1.0) * 0.5 + 0.25;
}

[test]
draw rect -1 -1 2 2
probe all rgba 0.25 0.75 0.75 0.25