vec2 GetTexCoord() { vec2 texCoord = vTexCoord.st; const float pi = 3.14159265358979323846; texCoord.x += sin(pi * 2.0 * (texCoord.y + timer * 0.125)) * 0.1; return texCoord; } vec4 ProcessTexel() { return getTexel(GetTexCoord()); }