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

LINEAR_MIPMAP_LINEAR

This filter selects two mipmaps that most closely match the size of the texture on screen and samples from both of them using the LINEAR algorithm. The color returned is a weighted average of those two samples. This mode is also known as trilinear filtering:

Of the *_MIPMAP_* filter modes, NEAREST_MIPMAP_NEAREST is the fastest and lowest quality while LINEAR_MIPMAP_LINEAR will provide the best quality but the lowest performance. The other two modes sit somewhere in between on the quality/speed scale. In most cases, the performance trade-off will be small enough that it's common to use LINEAR_MIPMAP_LINEAR.