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[require]
GLSL >= 1.10
[vertex shader]
varying vec4 pos;
void main()
{
gl_Position = gl_Vertex;
pos = gl_Vertex;
}
[fragment shader]
varying vec4 pos;
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_FragColor = sign(pos) + y_adjust(pos);
}
[test]
draw rect -1 -1 2 2
probe all rgb 0.5 0.5 0.5 0.5
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