Add ktx

2026-06-14 19:09:18 +01:00
parent 14bd1a9271
commit 13fa90a0e9
3958 changed files with 999286 additions and 4 deletions
@@ -0,0 +1,135 @@
+/* -*- tab-width: 4; -*- */
+/* vi: set sw=2 ts=4 expandtab: */
+
+/*
+ * Copyright 2010-2020 Mark Callow.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @internal
+ * @file
+ * @~English
+ *
+ * @brief Tests of internal API functions.
+ *
+ * @author Mark Callow, github.com/MarkCallow
+ */
+
+#if defined(_WIN32)
+  #define _CRT_SECURE_NO_WARNINGS
+  #if _MSC_VER < 1900
+    #define snprintf _snprintf
+  #endif
+#endif
+
+#include "gtest/gtest.h"
+#include "image.hpp"
+
+namespace {
+
+////////////////////////
+// normalisation tests
+////////////////////////
+
+template<typename ColorType>
+void test_color(ColorType input, ColorType output) {
+    ColorType color;
+    for (uint32_t i = 0; i < color.comps_count(); ++i) {
+        color.set(i, static_cast<typename ColorType::value_type>(input[i]));
+    }
+
+    // Verify color components were set correctly
+    for (uint32_t i = 0; i < color.comps_count(); ++i) {
+        EXPECT_EQ(color[i], static_cast<typename ColorType::value_type>(input[i]));
+    }
+
+    color.normalize();
+
+    for (uint32_t  i = 0; i < color.comps_count(); ++i) {
+        EXPECT_EQ(color[i], static_cast<typename ColorType::value_type>(output[i]));
+    }
+}
+
+static constexpr uint32_t min_val{0};
+static constexpr uint32_t max_val[3]={255, 65535, 4294967295};
+static constexpr uint32_t some_val[3]={31, 191, 178};
+
+template<uint32_t componentCount>
+void test_by_channel( const uint32_t min_res[], const uint32_t max_res[],
+    const uint32_t some_res8[], const uint32_t some_res16[], const uint32_t some_res32[]) {
+    {
+        color<uint8_t, componentCount> c8i{(uint8_t)min_val, (uint8_t)min_val, (uint8_t)min_val, (uint8_t)min_val};
+        color<uint8_t, componentCount> c8o{(uint8_t)min_res[0], (uint8_t)min_res[0], (uint8_t)min_res[0], 0};
+        test_color(c8i, c8o);
+    }
+    {
+        color<uint8_t, componentCount> c8i{(uint8_t)max_val[0], (uint8_t)max_val[0], (uint8_t)max_val[0], (uint8_t)max_val[0]};
+        color<uint8_t, componentCount> c8o{(uint8_t)max_res[0], (uint8_t)max_res[0], (uint8_t)max_res[0], (uint8_t)max_val[0]};
+        test_color(c8i, c8o);
+    }
+    {
+        color<uint8_t, componentCount> c8i{(uint8_t)some_val[0], (uint8_t)some_val[1], (uint8_t)some_val[2], 0};
+        color<uint8_t, componentCount> c8o{(uint8_t)some_res8[0], (uint8_t)some_res8[1], (uint8_t)some_res8[2], 0};
+        test_color(c8i, c8o);
+    }
+    {
+        color<uint16_t, componentCount> c16i{(uint16_t)min_val, (uint16_t)min_val, (uint16_t)min_val, (uint16_t)min_val};
+        color<uint16_t, componentCount> c16o{(uint16_t)min_res[1], (uint16_t)min_res[1], (uint16_t)min_res[1], 0};
+        test_color(c16i, c16o);
+    }
+    {
+        color<uint16_t, componentCount> c16i{(uint16_t)max_val[1], (uint16_t)max_val[1], (uint16_t)max_val[1], (uint16_t)max_val[1]};
+        color<uint16_t, componentCount> c16o{(uint16_t)max_res[1], (uint16_t)max_res[1], (uint16_t)max_res[1], (uint16_t)max_val[1]};
+        test_color(c16i, c16o);
+    }
+    {
+        color<uint16_t, componentCount> c16i{(uint16_t)some_val[0], (uint16_t)some_val[1], (uint16_t)some_val[2], 0};
+        color<uint16_t, componentCount> c16o{(uint16_t)some_res16[0], (uint16_t)some_res16[1], (uint16_t)some_res16[2], 0};
+        test_color(c16i, c16o);
+    }
+    {
+        color<uint32_t, componentCount> c32i{(uint32_t)min_val, (uint32_t)min_val, (uint32_t)min_val, (uint32_t)min_val};
+        color<uint32_t, componentCount> c32o{(uint32_t)min_res[2], (uint32_t)min_res[2], (uint32_t)min_res[2], 0};
+        test_color(c32i, c32o);
+    }
+    {
+        color<uint32_t, componentCount> c32i{(uint32_t)max_val[2], (uint32_t)max_val[2], (uint32_t)max_val[2], (uint32_t)max_val[2]};
+        color<uint32_t, componentCount> c32o{(uint32_t)max_res[2], (uint32_t)max_res[2], (uint32_t)max_res[2], (uint32_t)max_val[2]};
+        test_color(c32i, c32o);
+    }
+    {
+        color<uint32_t, componentCount> c32i{(uint32_t)some_val[0], (uint32_t)some_val[1], (uint32_t)some_val[2], 0};
+        color<uint32_t, componentCount> c32o{(uint32_t)some_res32[0], (uint32_t)some_res32[1], (uint32_t)some_res32[2], 0};
+        test_color(c32i, c32o);
+    }
+}
+
+// Hand tested vectors and their normalised results in GeoGebra
+static constexpr uint32_t min_res[3]={54, 13849, 907633408};     // These are -0.577350 float in 8bit-UNORM, 16bit-UNORM and 32bit-UNORM values
+static constexpr uint32_t max_res[3]={201, 51686, 3387333888};
+
+static constexpr uint32_t some_res8[3]={30, 192, 179};
+static constexpr uint32_t some_res16[3]={13790, 13883, 13875};
+static constexpr uint32_t some_res32[3]={907633408, 907633408, 907633408};
+
+static constexpr uint32_t min_res2[3]={37, 9597, 628983424};
+static constexpr uint32_t max_res2[3]={218, 55938, 3665984000};
+static constexpr uint32_t some_res8_2[3]={21, 198, 128};
+static constexpr uint32_t some_res16_2[3]={9541, 9654, 32768};
+static constexpr uint32_t some_res32_2[3]={628983424, 628983424, 2147483648};
+
+static constexpr uint32_t min_res1[3]={0, 0, 0};
+static constexpr uint32_t max_res1[3]={255, 65535, 4294967295};
+static constexpr uint32_t some_res8_1[3]={255, 0, 0};            // Second and third values are unused because its single channel image result
+static constexpr uint32_t some_res16_1[3]={65535, 0, 0};         // Same as above
+static constexpr uint32_t some_res32_1[3]={4294967295, 0, 0};    // Same as above
+
+TEST(NormaliseColorTest, multi_channel_test) {
+    test_by_channel<4>(min_res, max_res, some_res8, some_res16, some_res32);
+    test_by_channel<3>(min_res, max_res, some_res8, some_res16, some_res32);
+    test_by_channel<2>(min_res2, max_res2, some_res8_2, some_res16_2, some_res32_2);
+    test_by_channel<1>(min_res1, max_res1, some_res8_1, some_res16_1, some_res32_1);
+}
+
+}  // namespace