Method fromFile

src/main/java/field/graphics/TextureArray.kt:108–134

        @JvmStatic
        // because of the way that this rewrites the unit of a, potentially already loaded, texture list this isn't very useful outside of the context of Trace
        fun fromFile(unit: Int, fn: String): TextureArray? {

            val uu = dirCache.computeIfAbsent(fn) {
                val jj = mutableListOf(File(fn))

                jj.sort()

                val dim = SlowJPEG().dimensions(jj[0].absolutePath)

                val dat = ByteBuffer.allocateDirect(dim[0] * dim[1] * 3 * jj.size)

                jj.forEachIndexed { i, n ->
                    dat.position(i * dim[0] * dim[1] * 3)
                    dat.limit((i + 1) * dim[0] * dim[1] * 3)
                    SlowJPEG().decompressRaw(n.absolutePath, dat, dim[0], dim[1])
                    dat.clear()

                }
                dat.clear()

                TextureArray(unit, dim[0], dim[1], jj.size, dat)
            }
            uu?.unit = unit
            return uu
        }

    }
}