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66 changes: 66 additions & 0 deletions
66
interface/java_binding/src/main/java/org/khronos/ktx/KtxUtilities.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| /* | ||
| * Copyright (c) 2024, Khronos Group and Contributors | ||
| * Copyright (c) 2021, Shukant Pal and Contributors | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
| package org.khronos.ktx; | ||
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| import java.util.Arrays; | ||
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| /** | ||
| * Package-private utility methods | ||
| */ | ||
| class KtxUtilities { | ||
|
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| /** | ||
| * Validates the given value as an input swizzle to be set as | ||
| * {@link KtxBasisParams#setInputSwizzle(char[])} or | ||
| * {@link KtxAstcParams#setInputSwizzle(char[])}.<br> | ||
| * <br> | ||
| * When the given swizzle is <code>null</code>, then a default swizzle is | ||
| * returned, which is a 4-element <code>char</code> array with all elements | ||
| * being 0. <br> | ||
| * <br> | ||
| * Otherwise, if the given array does not have a length of 4, then an | ||
| * <code>IllegalArgumentException</code> is thrown.<br> | ||
| * <br> | ||
| * If the given swizzle is equal to the default swizzle, then it is returned | ||
| * directly. <br> | ||
| * <br> | ||
| * Otherwise, this swizzle must match the regular expression | ||
| * <code>/^[rgba01]{4}$/</code>.<br> | ||
| * | ||
| * @param inputSwizzle The input swizzle | ||
| * @return The validated input swizzle, or a new default swizzle if the input | ||
| * was <code>null</code> | ||
| * @throws IllegalArgumentException If the given swizzle is not valid | ||
| */ | ||
| static char[] validateSwizzle(char inputSwizzle[]) { | ||
| char defaultSwizzle[] = new char[4]; | ||
| if (inputSwizzle == null) { | ||
| return defaultSwizzle; | ||
| } | ||
| if (inputSwizzle.length != 4) { | ||
| throw new IllegalArgumentException("The inputSwizzle must contain 4 characters"); | ||
| } | ||
| if (Arrays.equals(inputSwizzle, defaultSwizzle)) { | ||
| return inputSwizzle; | ||
| } | ||
| String valid = "rgba01"; | ||
| for (int i = 0; i < inputSwizzle.length; i++) { | ||
| char c = inputSwizzle[i]; | ||
| if (valid.indexOf(c) == -1) { | ||
| throw new IllegalArgumentException("The inputSwizzle may only consist of 'rgba01', but contains " + c); | ||
| } | ||
| } | ||
| return inputSwizzle; | ||
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| } | ||
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| /** | ||
| * Private constructor to prevent instantiation | ||
| */ | ||
| private KtxUtilities() { | ||
| // Private constructor to prevent instantiation | ||
| } | ||
| } |
53 changes: 53 additions & 0 deletions
53
interface/java_binding/src/test/java/org/khronos/ktx/KtxUtilitiesTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| /* | ||
| * Copyright (c) 2024, Khronos Group and Contributors | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
|
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| package org.khronos.ktx; | ||
|
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| import static org.junit.jupiter.api.Assertions.assertArrayEquals; | ||
| import static org.junit.jupiter.api.Assertions.assertThrows; | ||
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| import java.io.IOException; | ||
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| import org.junit.jupiter.api.Test; | ||
|
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| public class KtxUtilitiesTest { | ||
| @Test | ||
| public void testValidSwizzle() { | ||
| char swizzle[] = new char[] { 'a', '1', 'r', '0' }; | ||
| char expected[] = swizzle; | ||
| char actual[] = KtxUtilities.validateSwizzle(swizzle); | ||
| assertArrayEquals(expected, actual, "Accepts valid swizzle and returns it"); | ||
| } | ||
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| @Test | ||
| public void testNullSwizzle() { | ||
| char expected[] = new char[] { 0, 0, 0, 0 }; | ||
| char actual[] = KtxUtilities.validateSwizzle(null); | ||
| assertArrayEquals(expected, actual, "Accepts null swizzle (to apply no swizzle), and returns a default"); | ||
| } | ||
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| @Test | ||
| public void testDefaultSwizzle() { | ||
| char swizzle[] = new char[] { 0, 0, 0, 0 }; | ||
| char expected[] = swizzle; | ||
| char actual[] = KtxUtilities.validateSwizzle(swizzle); | ||
| assertArrayEquals(expected, actual, "Accepts default swizzle (all zeros)"); | ||
| } | ||
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| @Test | ||
| public void testInvalidSwizzleLength() throws IOException { | ||
| char swizzle[] = new char[] { 'a', 'b', 'r', 'g', 'r', 'g' }; | ||
| assertThrows(IllegalArgumentException.class, () -> KtxUtilities.validateSwizzle(swizzle), | ||
| "Swizzle length != 4 expected to throw IllegalArgumentException"); | ||
| } | ||
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| @Test | ||
| public void testInvalidSwizzleChar() throws IOException { | ||
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| char swizzle[] = new char[] { 'a', 'b', 'X', 'g' }; | ||
| assertThrows(IllegalArgumentException.class, () -> KtxUtilities.validateSwizzle(swizzle), | ||
| "Invalid swizzle character expected to throw IllegalArgumentException"); | ||
| } | ||
| } |
46 changes: 0 additions & 46 deletions
46
interface/java_binding/src/test/java/org/khronos/ktx/test/KtxAstcParamsTest.java
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