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[require]
GLSL >= 1.10
[vertex shader]
varying vec4 color;
varying float x;
varying float y;
void main()
{
gl_Position = gl_Vertex;
x = gl_Vertex.x;
y = gl_Vertex.y;
}
[fragment shader]
varying float x;
varying float y;
void main()
{
if (x < 0.0) {
gl_FragColor = vec4(0.0, 1.0, 0.0, 0.0);
/* left */
for (float f = -2.0; f < x; f++) {
if (f != y + 5.0) /* always */
break;
gl_FragColor += vec4(1.0, 0.0, 0.0, 0.0);
}
} else {
/* right */
gl_FragColor = vec4(0.0, 1.0, 0.0, 0.0);
}
}
[test]
draw rect -1 -1 2 2
probe all rgba 0.0 1.0 0.0 0.0
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