8 gl_Position = gl_Vertex;
15 /* This test does two things that glsl-fs-atan-1 doesn't: It
16 * tests behavior at y = 0, x < 0 (the discontinuity), and it
17 * does so using the vec4 variant with some of the same values
18 * used in glsl-fs-atan-1.
20 gl_FragColor = atan(y, x) / (2.0 * 3.1415926) + 0.5;
24 uniform vec4 y -1.0 -1.0 0.0 1.0
25 uniform vec4 x 0.0 -1.0 -1.0 -1.0
27 probe all rgba 0.25 0.125 1.0 0.875