#version 300 es
out mediump vec4 _fragData;
uniform highp float _Speed;
uniform highp vec4 _Time;
highp vec4 func( in highp vec2 uv )
{
    highp float s = sin(_Speed * _Time.x);
    highp float c = cos(_Speed * _Time.x);

    highp mat2 rotationMatrix = mat2(c, s, -s, c);
    // various operations on a matrix
    rotationMatrix = rotationMatrix * 2.0;
    rotationMatrix = rotationMatrix - 1.0;
    rotationMatrix = s - rotationMatrix;
    rotationMatrix = c + rotationMatrix;
    rotationMatrix /= s;

    mediump mat2 halfMatrix = mat2(c, s, -s, c);
    halfMatrix = halfMatrix * 2.0;
    halfMatrix = halfMatrix - 1.0;
    halfMatrix = s - halfMatrix;
    halfMatrix = c + halfMatrix;
    halfMatrix /= s;

    return vec4((rotationMatrix * uv), (halfMatrix * uv));
}
in highp vec2 uv;
void main() {
    _fragData = func(uv);
}