1 files changed, 210 insertions, 0 deletions
diff --git a/gfx/angle/src/common/mathutil_unittest.cpp b/gfx/angle/src/common/mathutil_unittest.cpp
new file mode 100755
index 000000000..bf443b72b
--- /dev/null
+++ b/gfx/angle/src/common/mathutil_unittest.cpp
@@ -0,0 +1,210 @@
+//
+// Copyright 2015 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// mathutil_unittest:
+//   Unit tests for the utils defined in mathutil.h
+//
+
+#include "mathutil.h"
+
+#include <gtest/gtest.h>
+
+using namespace gl;
+
+namespace
+{
+
+// Test the correctness of packSnorm2x16 and unpackSnorm2x16 functions.
+// For floats f1 and f2, unpackSnorm2x16(packSnorm2x16(f1, f2)) should be same as f1 and f2.
+TEST(MathUtilTest, packAndUnpackSnorm2x16)
+{
+    const float input[8][2] =
+    {
+        { 0.0f, 0.0f },
+        { 1.0f, 1.0f },
+        { -1.0f, 1.0f },
+        { -1.0f, -1.0f },
+        { 0.875f, 0.75f },
+        { 0.00392f, -0.99215f },
+        { -0.000675f, 0.004954f },
+        { -0.6937f, -0.02146f }
+    };
+    const float floatFaultTolerance = 0.0001f;
+    float outputVal1, outputVal2;
+
+    for (size_t i = 0; i < 8; i++)
+    {
+        unpackSnorm2x16(packSnorm2x16(input[i][0], input[i][1]), &outputVal1, &outputVal2);
+        EXPECT_NEAR(input[i][0], outputVal1, floatFaultTolerance);
+        EXPECT_NEAR(input[i][1], outputVal2, floatFaultTolerance);
+    }
+}
+
+// Test the correctness of packSnorm2x16 and unpackSnorm2x16 functions with infinity values,
+// result should be clamped to [-1, 1].
+TEST(MathUtilTest, packAndUnpackSnorm2x16Infinity)
+{
+    const float floatFaultTolerance = 0.0001f;
+    float outputVal1, outputVal2;
+
+    unpackSnorm2x16(packSnorm2x16(std::numeric_limits<float>::infinity(),
+                                  std::numeric_limits<float>::infinity()), &outputVal1, &outputVal2);
+    EXPECT_NEAR(1.0f, outputVal1, floatFaultTolerance);
+    EXPECT_NEAR(1.0f, outputVal2, floatFaultTolerance);
+
+    unpackSnorm2x16(packSnorm2x16(std::numeric_limits<float>::infinity(),
+                                  -std::numeric_limits<float>::infinity()), &outputVal1, &outputVal2);
+    EXPECT_NEAR(1.0f, outputVal1, floatFaultTolerance);
+    EXPECT_NEAR(-1.0f, outputVal2, floatFaultTolerance);
+
+    unpackSnorm2x16(packSnorm2x16(-std::numeric_limits<float>::infinity(),
+                                  -std::numeric_limits<float>::infinity()), &outputVal1, &outputVal2);
+    EXPECT_NEAR(-1.0f, outputVal1, floatFaultTolerance);
+    EXPECT_NEAR(-1.0f, outputVal2, floatFaultTolerance);
+}
+
+// Test the correctness of packUnorm2x16 and unpackUnorm2x16 functions.
+// For floats f1 and f2, unpackUnorm2x16(packUnorm2x16(f1, f2)) should be same as f1 and f2.
+TEST(MathUtilTest, packAndUnpackUnorm2x16)
+{
+    const float input[8][2] =
+    {
+        { 0.0f, 0.0f },
+        { 1.0f, 1.0f },
+        { -1.0f, 1.0f },
+        { -1.0f, -1.0f },
+        { 0.875f, 0.75f },
+        { 0.00392f, -0.99215f },
+        { -0.000675f, 0.004954f },
+        { -0.6937f, -0.02146f }
+    };
+    const float floatFaultTolerance = 0.0001f;
+    float outputVal1, outputVal2;
+
+    for (size_t i = 0; i < 8; i++)
+    {
+        unpackUnorm2x16(packUnorm2x16(input[i][0], input[i][1]), &outputVal1, &outputVal2);
+        float expected = input[i][0] < 0.0f ? 0.0f : input[i][0];
+        EXPECT_NEAR(expected, outputVal1, floatFaultTolerance);
+        expected = input[i][1] < 0.0f ? 0.0f : input[i][1];
+        EXPECT_NEAR(expected, outputVal2, floatFaultTolerance);
+    }
+}
+
+// Test the correctness of packUnorm2x16 and unpackUnorm2x16 functions with infinity values,
+// result should be clamped to [0, 1].
+TEST(MathUtilTest, packAndUnpackUnorm2x16Infinity)
+{
+    const float floatFaultTolerance = 0.0001f;
+    float outputVal1, outputVal2;
+
+    unpackUnorm2x16(packUnorm2x16(std::numeric_limits<float>::infinity(),
+                                  std::numeric_limits<float>::infinity()), &outputVal1, &outputVal2);
+    EXPECT_NEAR(1.0f, outputVal1, floatFaultTolerance);
+    EXPECT_NEAR(1.0f, outputVal2, floatFaultTolerance);
+
+    unpackUnorm2x16(packUnorm2x16(std::numeric_limits<float>::infinity(),
+                                  -std::numeric_limits<float>::infinity()), &outputVal1, &outputVal2);
+    EXPECT_NEAR(1.0f, outputVal1, floatFaultTolerance);
+    EXPECT_NEAR(0.0f, outputVal2, floatFaultTolerance);
+
+    unpackUnorm2x16(packUnorm2x16(-std::numeric_limits<float>::infinity(),
+                                  -std::numeric_limits<float>::infinity()), &outputVal1, &outputVal2);
+    EXPECT_NEAR(0.0f, outputVal1, floatFaultTolerance);
+    EXPECT_NEAR(0.0f, outputVal2, floatFaultTolerance);
+}
+
+// Test the correctness of packHalf2x16 and unpackHalf2x16 functions.
+// For floats f1 and f2, unpackHalf2x16(packHalf2x16(f1, f2)) should be same as f1 and f2.
+TEST(MathUtilTest, packAndUnpackHalf2x16)
+{
+    const float input[8][2] =
+    {
+        { 0.0f, 0.0f },
+        { 1.0f, 1.0f },
+        { -1.0f, 1.0f },
+        { -1.0f, -1.0f },
+        { 0.875f, 0.75f },
+        { 0.00392f, -0.99215f },
+        { -0.000675f, 0.004954f },
+        { -0.6937f, -0.02146f },
+    };
+    const float floatFaultTolerance = 0.0005f;
+    float outputVal1, outputVal2;
+
+    for (size_t i = 0; i < 8; i++)
+    {
+        unpackHalf2x16(packHalf2x16(input[i][0], input[i][1]), &outputVal1, &outputVal2);
+        EXPECT_NEAR(input[i][0], outputVal1, floatFaultTolerance);
+        EXPECT_NEAR(input[i][1], outputVal2, floatFaultTolerance);
+    }
+}
+
+// Test the correctness of gl::isNaN function.
+TEST(MathUtilTest, isNaN)
+{
+    EXPECT_TRUE(isNaN(bitCast<float>(0xffu << 23 | 1u)));
+    EXPECT_TRUE(isNaN(bitCast<float>(1u << 31 | 0xffu << 23 | 1u)));
+    EXPECT_TRUE(isNaN(bitCast<float>(1u << 31 | 0xffu << 23 | 0x400000u)));
+    EXPECT_TRUE(isNaN(bitCast<float>(1u << 31 | 0xffu << 23 | 0x7fffffu)));
+    EXPECT_FALSE(isNaN(0.0f));
+    EXPECT_FALSE(isNaN(bitCast<float>(1u << 31 | 0xffu << 23)));
+    EXPECT_FALSE(isNaN(bitCast<float>(0xffu << 23)));
+}
+
+// Test the correctness of gl::isInf function.
+TEST(MathUtilTest, isInf)
+{
+    EXPECT_TRUE(isInf(bitCast<float>(0xffu << 23)));
+    EXPECT_TRUE(isInf(bitCast<float>(1u << 31 | 0xffu << 23)));
+    EXPECT_FALSE(isInf(0.0f));
+    EXPECT_FALSE(isInf(bitCast<float>(0xffu << 23 | 1u)));
+    EXPECT_FALSE(isInf(bitCast<float>(1u << 31 | 0xffu << 23 | 1u)));
+    EXPECT_FALSE(isInf(bitCast<float>(1u << 31 | 0xffu << 23 | 0x400000u)));
+    EXPECT_FALSE(isInf(bitCast<float>(1u << 31 | 0xffu << 23 | 0x7fffffu)));
+    EXPECT_FALSE(isInf(bitCast<float>(0xfeu << 23 | 0x7fffffu)));
+    EXPECT_FALSE(isInf(bitCast<float>(1u << 31 | 0xfeu << 23 | 0x7fffffu)));
+}
+
+TEST(MathUtilTest, CountLeadingZeros)
+{
+    for (unsigned int i = 0; i < 32u; ++i)
+    {
+        uint32_t iLeadingZeros = 1u << (31u - i);
+        EXPECT_EQ(i, CountLeadingZeros(iLeadingZeros));
+    }
+    EXPECT_EQ(32u, CountLeadingZeros(0));
+}
+
+// Some basic tests. Tests that rounding up zero produces zero.
+TEST(MathUtilTest, BasicRoundUp)
+{
+    EXPECT_EQ(0u, rx::roundUp(0u, 4u));
+    EXPECT_EQ(4u, rx::roundUp(1u, 4u));
+    EXPECT_EQ(4u, rx::roundUp(4u, 4u));
+}
+
+// Test that rounding up zero produces zero for checked ints.
+TEST(MathUtilTest, CheckedRoundUpZero)
+{
+    auto checkedValue = rx::CheckedRoundUp(0u, 4u);
+    ASSERT_TRUE(checkedValue.IsValid());
+    ASSERT_EQ(0u, checkedValue.ValueOrDie());
+}
+
+// Test out-of-bounds with CheckedRoundUp
+TEST(MathUtilTest, CheckedRoundUpInvalid)
+{
+    // The answer to this query is out of bounds.
+    auto limit        = std::numeric_limits<unsigned int>::max();
+    auto checkedValue = rx::CheckedRoundUp(limit, limit - 1);
+    ASSERT_FALSE(checkedValue.IsValid());
+
+    // Our implementation can't handle this query, despite the parameters being in range.
+    auto checkedLimit = rx::CheckedRoundUp(limit - 1, limit);
+    ASSERT_FALSE(checkedLimit.IsValid());
+}
+
+}  // anonymous namespace