Touhou Music Room 2.3.0 patch

extract.diff

diff --unified a/musicroom/extract.cpp b/musicroom/extract.cpp
--- a/musicroom/extract.cpp
+++ b/musicroom/extract.cpp
@@ -8,6 +8,14 @@
 
 #include <math.h>
 
+#if __cplusplus > 201703L
+# include <numbers>
+	static constexpr double PI = std::numbers::pi_v<double>;
+#else
+# include <cmath>
+	static constexpr double PI = std::acos(-1.0);
+#endif
+
 // FOX
 #include <FXHash.h>
 #include <FXStream.h>
@@ -95,6 +103,24 @@
 	SINGLETON(FadeAlg_Exp);
 };
 
+class FadeAlg_Smooth : public FadeAlg
+{
+public:
+	short*	Eval(short* f, long& c, long& Len)
+	{
+		double Step = (double)c / (double)Len;
+		for (unsigned short i = 0; i < 2; ++i)
+		{
+			*f = (double)*f * (0.5 * (cos(Step * PI) + 1.0));
+			f++;
+		}
+		return f;
+	}
+
+	FadeAlg_Smooth()	{Name = "Smooth";}
+	SINGLETON(FadeAlg_Smooth);
+}
+
 // Decryption thread
 // -----------------
 FXint Decrypter::run()
@@ -136,6 +162,7 @@
 {
 	FAs.Add()->Data = &FadeAlg_Linear::Inst();
 	FAs.Add()->Data = &FadeAlg_Exp::Inst();
+	FAs.Add()->Data = &FadeAlg_Smooth::Inst();
 }
 
 Extract_Vals::Extract_Vals()