random rotation implementation

[xmyhhh]

thanks for sharing the code, it helped me a lot!

however i have a question in frag shader "IndirectLighting-frag.glsl"

//………… line 74
  //  fetch rotation angle
  //  map rsmTexCoord to noiseTexCoord : [0,0.5] -> [0,4] (repeatable texture)
  float rotationAngle = texture(kernelRotations, rsmTexCoord.xy * noiseResolution).r;
  rotationAngle *= 2.0 * M_PI;
//………… line 87 
  //  rotate the offset vector
  float sin_theta = sin(rotationAngle);
  float cos_theta = cos(rotationAngle);
  sampleOffset = mat2(cos_theta, sin_theta, -sin_theta, cos_theta) * sampleOffset;

the rotationAngle seems to be fixed for every sample step, that means zhe rotaion for each fragment out is fixed!
That doesn't seem right to me. (Of course, I'm a beginner in this algorithm, so if I'm wrong, please help me out!)

Sorry to bother you and thanks again for sharing!