New answers tagged fragment-shader
4
1) Scale the texture coordinates from [0,1]x[0,1] -> [0,3]x[0,3]. It works with higher integer scales as well. This creates an imaginary 3x3 tiles grid.
st *= 3.;
2) Split the upscaled texture coordinates into the integer part and its float reminder.
vec2 i_st = floor(st); //the tile coords of the fragment - an integer pair {0,1,2}x{0,1,2}
vec2 f_st = ...
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