data/explicit_rotation.vert


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#version 120

attribute vec2 z;
uniform float rotation_angle;

void main()
{
  gl_Position.x = z.x * cos(rotation_angle) - z.y * sin(rotation_angle);
  gl_Position.y = z.x * sin(rotation_angle) + z.y * cos(rotation_angle);
  gl_Position.z = 0.;
  gl_Position.w = 1.;
  gl_PointSize = 32.;
}