initial commit, 4.5 stable

thirdparty/libktx/lib/swap.c

@@ -0,0 +1,57 @@
+/* -*- tab-width: 4; -*- */
+/* vi: set sw=2 ts=4 expandtab: */
+
+/* $Id$ */
+
+/*
+ * Copyright 2010-2020 The Khronos Group Inc.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <KHR/khrplatform.h>
+#include "ktx.h"
+
+/*
+ * SwapEndian16: Swaps endianness in an array of 16-bit values
+ */
+void
+_ktxSwapEndian16(khronos_uint16_t* pData16, ktx_size_t count)
+{
+    for (ktx_size_t i = 0; i < count; ++i)
+    {
+        khronos_uint16_t x = *pData16;
+        *pData16++ = (x << 8) | (x >> 8);
+    }
+}
+
+/*
+ * SwapEndian32: Swaps endianness in an array of 32-bit values
+ */
+void
+_ktxSwapEndian32(khronos_uint32_t* pData32, ktx_size_t count)
+{
+    for (ktx_size_t i = 0; i < count; ++i)
+    {
+        khronos_uint32_t x = *pData32;
+        *pData32++ = (x << 24) | ((x & 0xFF00) << 8) | ((x & 0xFF0000) >> 8) | (x >> 24);
+    }
+}
+
+/*
+ * SwapEndian364: Swaps endianness in an array of 32-bit values
+ */
+void
+_ktxSwapEndian64(khronos_uint64_t* pData64, ktx_size_t count)
+{
+    for (ktx_size_t i = 0; i < count; ++i)
+    {
+        khronos_uint64_t x = *pData64;
+        *pData64++ = (x << 56) | ((x & 0xFF00) << 40) | ((x & 0xFF0000) << 24)
+                     | ((x & 0xFF000000) << 8 ) | ((x & 0xFF00000000) >> 8)
+                     | ((x & 0xFF0000000000) >> 24)
+                     | ((x & 0xFF000000000000) << 40) | (x >> 56);
+    }
+}
+
+
+