mattdesl

vec2 backgroundUV (vec2 uv, vec2 resolution, vec2 texResolution) {
  float tAspect = texResolution.x / texResolution.y;
  float pAspect = resolution.x / resolution.y;
  float pwidth = resolution.x;
  float pheight = resolution.y;
  
  float width = 0.0;
  float height = 0.0;  
  if (tAspect > pAspect) {
    height = pheight;