[require]
GLSL >= 1.30

[vertex shader]
#version 130
void main()
{
    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}

[fragment shader]
#version 130
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(roundEven(x) / 25.0, -roundEven(-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 0.00 0.00 0
probe rgb  14  14 0.04 0.04 0
probe rgb  15  15 0.08 0.08 0
probe rgb  16  16 0.08 0.08 0
probe rgb  63  63 0.24 0.24 0
probe rgb 124 124 0.48 0.48 0
probe rgb 126 126 0.52 0.52 0
probe rgb 249 249 1.00 1.00 0