[require]
GLSL >= 1.10

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

[fragment shader]
void main()
{
    /* Divide by 10 to get a decimal part */
    float x = gl_FragCoord.x / 10.0;

    /* Divide by 25.0 to bring it into the [0, 1] range. */
    gl_FragColor = vec4(ceil(x) / 25.0, -ceil(-x) / 25.0, 0.0, 1.0);
}

[test]
clear color 0.0 0.0 0.0 0.0
clear
ortho
draw rect 0 0 250 250
probe rgb   1   1 0.04 0.00 0
probe rgb  63  63 0.28 0.24 0
probe rgb 125 125 0.52 0.48 0
probe rgb 249 249 1.0  0.96 0