From 14b7a526a6af21c5a8eb9fa1dbb13a8c5decbb60 Mon Sep 17 00:00:00 2001
From: Ilya Shurumov <ishurumov@gmail.com>
Date: Mon, 10 May 2021 03:30:22 +0600
Subject: [PATCH] - [Psy-X] half_float.h compatible with C language

---
 .../PsyX/include/PsyX/common/half_float.h     | 13 ++++++++
 src_rebuild/PsyX/src/gte/half_float.cpp       | 30 +++++++++++++------
 2 files changed, 34 insertions(+), 9 deletions(-)

diff --git a/src_rebuild/PsyX/include/PsyX/common/half_float.h b/src_rebuild/PsyX/include/PsyX/common/half_float.h
index 4884444d..dbee55b6 100644
--- a/src_rebuild/PsyX/include/PsyX/common/half_float.h
+++ b/src_rebuild/PsyX/include/PsyX/common/half_float.h
@@ -5,6 +5,7 @@ struct half
 {
 	unsigned short sh;
 
+#if defined(_LANGUAGE_C_PLUS_PLUS)||defined(__cplusplus)||defined(c_plusplus)
 	half() {};
 	half(const float x);
 	half(const half& other);
@@ -15,6 +16,18 @@ struct half
 		sh = other.sh;
 		return *this;
 	}
+#endif
 };
 
+#if defined(_LANGUAGE_C_PLUS_PLUS)||defined(__cplusplus)||defined(c_plusplus)
+extern "C" {
+#endif
+
+extern short to_half_float(const float x);
+extern float from_half_float(const short x);
+
+#if defined(_LANGUAGE_C_PLUS_PLUS)||defined(__cplusplus)||defined(c_plusplus)
+}
+#endif
+
 #endif // HALF_FLOAT
\ No newline at end of file
diff --git a/src_rebuild/PsyX/src/gte/half_float.cpp b/src_rebuild/PsyX/src/gte/half_float.cpp
index 6045b603..c92194e1 100644
--- a/src_rebuild/PsyX/src/gte/half_float.cpp
+++ b/src_rebuild/PsyX/src/gte/half_float.cpp
@@ -26,7 +26,7 @@ union FP16
 	};
 };
 
-half::half(const float x)
+short to_half_float(const float x)
 {
 	// this is a approximate solution
 	FP32 f = *(FP32*)&x;
@@ -50,17 +50,12 @@ half::half(const float x)
 
 	o.u = f.u >> 13; // Take the mantissa bits
 	o.u |= sign >> 16;
-	sh = o.u;
+	return o.u;
 }
 
-half::half(const half& other)
+float from_half_float(const short x)
 {
-	sh = other.sh;
-}
-
-half::operator float() const
-{
-	FP16 h = { sh };
+	FP16 h = { x };
 
 	static const FP32 magic = { 113 << 23 };
 	static const uint shifted_exp = 0x7c00 << 13; // exponent mask after shift
@@ -82,3 +77,20 @@ half::operator float() const
 	o.u |= (h.u & 0x8000) << 16;    // sign bit
 	return o.f;
 }
+
+// C++ parts
+
+half::half(const float x)
+{
+	sh = to_half_float(x);
+}
+
+half::half(const half& other)
+{
+	sh = other.sh;
+}
+
+half::operator float() const
+{
+	return from_half_float(sh);
+}