From 09eaa78ba15f412ff1b28dc66f128cfc4d86d219 Mon Sep 17 00:00:00 2001
From: thejinchao <thejinchao@gmail.com>
Date: Thu, 7 Aug 2025 21:41:54 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E4=B8=A4=E4=B8=AA=E5=AE=9A?=
 =?UTF-8?q?=E7=82=B9=E6=95=B0=E5=B8=B8=E9=87=8F?=
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---
 source/core/include/math/dvc_fix_point.h  | 24 ++++++++++++-----------
 source/core/source/math/dvc_fix_point.cpp |  2 ++
 test/unit/dvt_unit_fix_point.cpp          | 24 +++++++++++++++++++++++
 3 files changed, 39 insertions(+), 11 deletions(-)

diff --git a/source/core/include/math/dvc_fix_point.h b/source/core/include/math/dvc_fix_point.h
index 18799c1..6ef2c67 100644
--- a/source/core/include/math/dvc_fix_point.h
+++ b/source/core/include/math/dvc_fix_point.h
@@ -159,17 +159,19 @@ public:
 	// special value
 	static DV_CORE_API const ifloat64 kMax;
 	static DV_CORE_API const ifloat64 kMin;
-	static DV_CORE_API const ifloat64 kZero;
-	static DV_CORE_API const ifloat64 kOne;
-	static DV_CORE_API const ifloat64 kTwo;
-	static DV_CORE_API const ifloat64 kThree;
-	static DV_CORE_API const ifloat64 kFour;
-	static DV_CORE_API const ifloat64 kHalf;
-	static DV_CORE_API const ifloat64 kPi;
-	static DV_CORE_API const ifloat64 kPi2;
-	static DV_CORE_API const ifloat64 kPiHalf;
-	static DV_CORE_API const ifloat64 kE;
-	static DV_CORE_API const ifloat64 kNegOne;
+	static DV_CORE_API const ifloat64 kZero;		//0.0
+	static DV_CORE_API const ifloat64 kOne;			//1.0
+	static DV_CORE_API const ifloat64 kTwo;			//2.0
+	static DV_CORE_API const ifloat64 kThree;		//3.0
+	static DV_CORE_API const ifloat64 kFour;		//4.0
+	static DV_CORE_API const ifloat64 kHalf;		//0.5
+	static DV_CORE_API const ifloat64 kQuater;		//0.25
+	static DV_CORE_API const ifloat64 kOneEighth;	//0.125
+	static DV_CORE_API const ifloat64 kPi;			//3.14159265358979323846
+	static DV_CORE_API const ifloat64 kPi2;			//6.2831853071795
+	static DV_CORE_API const ifloat64 kPiHalf;		//1.57079632679489661923
+	static DV_CORE_API const ifloat64 kE;			//2.71828182845904523536
+	static DV_CORE_API const ifloat64 kNegOne;		// -1.0
 
 public:
 	ifloat64() : s3132(0) {}
diff --git a/source/core/source/math/dvc_fix_point.cpp b/source/core/source/math/dvc_fix_point.cpp
index 49f6607..b861919 100644
--- a/source/core/source/math/dvc_fix_point.cpp
+++ b/source/core/source/math/dvc_fix_point.cpp
@@ -10,6 +10,8 @@ const ifloat64 ifloat64::kTwo{ INT64_C(2) << kShift };
 const ifloat64 ifloat64::kThree{ INT64_C(3) << ifloat64::kShift };
 const ifloat64 ifloat64::kFour{ INT64_C(4) << ifloat64::kShift };
 const ifloat64 ifloat64::kHalf{ INT64_C(1) << (ifloat64::kShift-1) };
+const ifloat64 ifloat64::kQuater{ INT64_C(1) << (ifloat64::kShift - 2) };
+const ifloat64 ifloat64::kOneEighth{ INT64_C(1) << (ifloat64::kShift - 3) };
 const ifloat64 ifloat64::kPi{ INT64_C(0x3243f6a89) }; //static_cast<int64_t>(std::round(M_PI * kFloatScale));
 const ifloat64 ifloat64::kPi2{ INT64_C(0x6487ed511) };
 const ifloat64 ifloat64::kPiHalf{ INT64_C(0x1921fb544) };
diff --git a/test/unit/dvt_unit_fix_point.cpp b/test/unit/dvt_unit_fix_point.cpp
index 7043576..f1a391c 100644
--- a/test/unit/dvt_unit_fix_point.cpp
+++ b/test/unit/dvt_unit_fix_point.cpp
@@ -261,6 +261,30 @@ TEST(FixPoint64, Basic)
 	EXPECT_EQ(a.to_float(), -1.f);
 	EXPECT_EQ(a.to_int32(), -1);
 
+	a = iFloat64(0.25f);
+	EXPECT_EQ(a, iFloat64::kQuater);
+	EXPECT_EQ(a.s3132, iFloat64::kQuater.s3132);
+	EXPECT_EQ(a.to_float(), 0.25f);
+	EXPECT_EQ(a.to_int32(), 0);
+
+	a = iFloat64(-0.25f);
+	EXPECT_EQ(a, -iFloat64::kQuater);
+	EXPECT_EQ(a.s3132, -iFloat64::kQuater.s3132);
+	EXPECT_EQ(a.to_float(), -0.25f);
+	EXPECT_EQ(a.to_int32(), -1);
+
+	a = iFloat64(0.125f);
+	EXPECT_EQ(a, iFloat64::kOneEighth);
+	EXPECT_EQ(a.s3132, iFloat64::kOneEighth.s3132);
+	EXPECT_EQ(a.to_float(), 0.125f);
+	EXPECT_EQ(a.to_int32(), 0);
+
+	a = iFloat64(-0.125f);
+	EXPECT_EQ(a, -iFloat64::kOneEighth);
+	EXPECT_EQ(a.s3132, -iFloat64::kOneEighth.s3132);
+	EXPECT_EQ(a.to_float(), -0.125f);
+	EXPECT_EQ(a.to_int32(), -1);
+
 	a = iFloat64(M_PI);	//3.14
 	EXPECT_EQ(a, iFloat64::kPi);
 	EXPECT_EQ(a.s3132, iFloat64::kPi.s3132);