Real-Time 3D Graphics with WebGL 2 - Second Edition

MIRRORED_REPEAT

The algorithm for this mode is a little more complicated. If the coordinate's integer portion is even, the texture coordinates will be the same as they were with REPEAT. If the integer portion of the coordinate is odd, the resulting coordinate is 1 minus the fractional portion of the coordinate. This results in a texture that "flip-flops" as it repeats, with every other repetition being a mirror image:

As we mentioned earlier, these modes can be mixed and matched. For example, consider the following code snippet:

gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, ...