Refactored texture loading: added caching and allowed loading from RAM

src/test/java/ru/windcorp/optica/util/BinUtilTest.java

@@ -0,0 +1,58 @@
+package ru.windcorp.optica.util;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.Random;
+
+import org.junit.Test;
+
+import ru.windcorp.optica.common.util.BinUtil;
+
+public class BinUtilTest {
+	
+	@Test
+	public void cornerCases() {
+		test(1);
+		test(2);
+		test(3);
+		test(4);
+		test(7);
+		test(8);
+		test(9);
+		
+		test(1023);
+		test(1024);
+		test(1025);
+		
+		test((1 << 16) - 1);
+		test(1 << 16);
+		test((1 << 16) + 1);
+	}
+	
+	@Test
+	public void random() {
+		Random random = new Random(0);
+		
+		for (int i = 0; i < 10000; ++i) {
+			test(random.nextInt((1 << 30) - 2) + 1);
+		}
+	}
+	
+	void test(int x) {
+		assertEquals("Round, x = " + x, referenceRound(x), BinUtil.roundToGreaterPowerOf2(x));
+		assertEquals("Greater, x = " + x, referenceGreater(x), BinUtil.closestGreaterPowerOf2(x));
+	}
+	
+	int referenceGreater(int x) {
+		int p;
+		for (p = 1; p <= x; p *= 2);
+		return p;
+	}
+	
+	int referenceRound(int x) {
+		int p;
+		for (p = 1; p < x; p *= 2);
+		return p;
+	}
+
+}