1 files changed, 61 insertions, 0 deletions
diff --git a/intern/cycles/test/util_math_test.cpp b/intern/cycles/test/util_math_test.cpp
new file mode 100644
index 00000000000..b6ce3ef0cf3
--- /dev/null
+++ b/intern/cycles/test/util_math_test.cpp
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2011-2021 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "testing/testing.h"
+
+#include "util/util_math.h"
+
+CCL_NAMESPACE_BEGIN
+
+TEST(math, next_power_of_two)
+{
+  EXPECT_EQ(next_power_of_two(0), 1);
+  EXPECT_EQ(next_power_of_two(1), 2);
+  EXPECT_EQ(next_power_of_two(2), 4);
+  EXPECT_EQ(next_power_of_two(3), 4);
+  EXPECT_EQ(next_power_of_two(4), 8);
+}
+
+TEST(math, prev_power_of_two)
+{
+  EXPECT_EQ(prev_power_of_two(0), 0);
+
+  EXPECT_EQ(prev_power_of_two(1), 1);
+  EXPECT_EQ(prev_power_of_two(2), 1);
+
+  EXPECT_EQ(prev_power_of_two(3), 2);
+  EXPECT_EQ(prev_power_of_two(4), 2);
+
+  EXPECT_EQ(prev_power_of_two(5), 4);
+  EXPECT_EQ(prev_power_of_two(6), 4);
+  EXPECT_EQ(prev_power_of_two(7), 4);
+  EXPECT_EQ(prev_power_of_two(8), 4);
+}
+
+TEST(math, reverse_integer_bits)
+{
+  EXPECT_EQ(reverse_integer_bits(0xFFFFFFFF), 0xFFFFFFFF);
+  EXPECT_EQ(reverse_integer_bits(0x00000000), 0x00000000);
+  EXPECT_EQ(reverse_integer_bits(0x1), 0x80000000);
+  EXPECT_EQ(reverse_integer_bits(0x80000000), 0x1);
+  EXPECT_EQ(reverse_integer_bits(0xFFFF0000), 0x0000FFFF);
+  EXPECT_EQ(reverse_integer_bits(0x0000FFFF), 0xFFFF0000);
+  EXPECT_EQ(reverse_integer_bits(0x00FF0000), 0x0000FF00);
+  EXPECT_EQ(reverse_integer_bits(0x0000FF00), 0x00FF0000);
+  EXPECT_EQ(reverse_integer_bits(0xAAAAAAAA), 0x55555555);
+}
+
+CCL_NAMESPACE_END