- copied constexpr declarations plus a few fixed in utility code and fixed a few places where this triggered a compile error now.

src/common/engine/stringtable.cpp

@@ -450,7 +450,7 @@ void FStringTable::InsertString(int lumpnum, int langid, FName label, const FStr
 		auto replace = allMacros.CheckKey(lookupname);
 		for (int i = 0; i < 4; i++)
 		{
-			const char *replacement = replace && replace->Replacements[i] ? replace->Replacements[i].GetChars() : "";
+			const char *replacement = replace? replace->Replacements[i].GetChars() : "";
 			te.strings[i].Substitute(replacee, replacement);
 		}
 	}

src/common/utility/m_fixed.h

@@ -43,7 +43,7 @@ inline int32_t FixedDiv (int32_t a, int32_t b)
 	return (int32_t)(((int64_t)a << 16) / b);
 }
 
-__forceinline int32_t FixedMul(int32_t a, int32_t b) 
+__forceinline constexpr int32_t FixedMul(int32_t a, int32_t b) 
 { 
 	return (int32_t)(((int64_t)a * b) >> 16); 
 }
@@ -53,9 +53,19 @@ inline fixed_t FloatToFixed(double f)
 	return xs_Fix<16>::ToFix(f);
 }
 
-inline double FixedToFloat(fixed_t f)
+inline constexpr fixed_t IntToFixed(int32_t f)
 {
-	return f / 65536.;
+	return f << FRACBITS;
+}
+
+inline constexpr double FixedToFloat(fixed_t f)
+{
+	return f * (1/65536.);
+}
+
+inline constexpr int32_t FixedToInt(fixed_t f)
+{
+	return (f + FRACUNIT/2) >> FRACBITS;
 }
 
 inline unsigned FloatToAngle(double f)
@@ -63,12 +73,12 @@ inline unsigned FloatToAngle(double f)
 	return xs_CRoundToInt((f)* (0x40000000 / 90.));
 }
 
-inline double AngleToFloat(unsigned f)
+inline constexpr double AngleToFloat(unsigned f)
 {
 	return f * (90. / 0x40000000);
 }
 
-inline double AngleToFloat(int f)
+inline constexpr double AngleToFloat(int f)
 {
 	return f * (90. / 0x40000000);
 }

src/common/utility/palentry.h

@@ -12,7 +12,7 @@
 struct PalEntry
 {
 	PalEntry() = default;
-	PalEntry (uint32_t argb) { d = argb; }
+	constexpr PalEntry (uint32_t argb) : d(argb) { }
 	operator uint32_t () const { return d; }
 	void SetRGB(PalEntry other)
 	{
@@ -36,35 +36,35 @@ struct PalEntry
 			return other;
 		}
 	}
-	int Luminance() const 
+	constexpr int Luminance() const 
 	{
 		return (r * 77 + g * 143 + b * 37) >> 8;
 	}
 
-	int Amplitude() const
+	constexpr int Amplitude() const
 	{
 		return std::max(r, std::max(g, b));
 	}
 
-	void Decolorize()	// this for 'nocoloredspritelighting' and not the same as desaturation. The normal formula results in a value that's too dark.
+	constexpr void Decolorize()	// this for 'nocoloredspritelighting' and not the same as desaturation. The normal formula results in a value that's too dark.
 	{
 		int v = (r + g + b);
 		r = g = b = ((255*3) + v + v) / 9;
 	}
-	bool isBlack() const
+	constexpr bool isBlack() const
 	{
 		return (d & 0xffffff) == 0;
 	}
-	bool isWhite() const
+	constexpr bool isWhite() const
 	{
 		return (d & 0xffffff) == 0xffffff;
 	}
 	PalEntry &operator= (const PalEntry &other) = default;
-	PalEntry &operator= (uint32_t other) { d = other; return *this; }
+	constexpr PalEntry &operator= (uint32_t other) { d = other; return *this; }
-	PalEntry InverseColor() const { PalEntry nc; nc.a = a; nc.r = 255 - r; nc.g = 255 - g; nc.b = 255 - b; return nc; }
+	constexpr PalEntry InverseColor() const { PalEntry nc(a, 255 - r, 255 - g, 255 - b); return nc; }
 #ifdef __BIG_ENDIAN__
-	PalEntry (uint8_t ir, uint8_t ig, uint8_t ib) : a(0), r(ir), g(ig), b(ib) {}
+	constexpr PalEntry (uint8_t ir, uint8_t ig, uint8_t ib) : a(0), r(ir), g(ig), b(ib) {}
-	PalEntry (uint8_t ia, uint8_t ir, uint8_t ig, uint8_t ib) : a(ia), r(ir), g(ig), b(ib) {}
+	constexpr PalEntry (uint8_t ia, uint8_t ir, uint8_t ig, uint8_t ib) : a(ia), r(ir), g(ig), b(ib) {}
 	union
 	{
 		struct
@@ -74,8 +74,8 @@ struct PalEntry
 		uint32_t d;
 	};
 #else
-	PalEntry (uint8_t ir, uint8_t ig, uint8_t ib) : b(ib), g(ig), r(ir), a(0) {}
+	constexpr PalEntry (uint8_t ir, uint8_t ig, uint8_t ib) : b(ib), g(ig), r(ir), a(0) {}
-	PalEntry (uint8_t ia, uint8_t ir, uint8_t ig, uint8_t ib) : b(ib), g(ig), r(ir), a(ia) {}
+	constexpr PalEntry (uint8_t ia, uint8_t ir, uint8_t ig, uint8_t ib) : b(ib), g(ig), r(ir), a(ia) {}
 	union
 	{
 		struct
@@ -87,7 +87,7 @@ struct PalEntry
 #endif
 };
 
-inline int Luminance(int r, int g, int b)
+constexpr inline int Luminance(int r, int g, int b)
 {
 	return (r * 77 + g * 143 + b * 37) >> 8;
 }

src/common/utility/tarray.h

@@ -1527,6 +1527,16 @@ public:
 	{
 		memset(&bytes[0], on ? -1 : 0, sizeof(bytes));
 	}
+
+	// These are for utilities that need access to the raw storage. The serializer needs this to do its work, for example.
+	uint8_t* Storage()
+	{
+		return bytes;
+	}
+	unsigned StorageSize() const
+	{
+		return sizeof(bytes);
+	}
 };
 
 // A wrapper to externally stored data.

src/common/utility/utf8.cpp

@@ -249,7 +249,7 @@ const char *MakeUTF8(const char *outline, int *numchars)
 				UTF8String.Push(encode[i]);
 			}
 		}
-		if (numchars) *numchars++;
+		if (numchars) (*numchars)++;
 	}
 	UTF8String.Push(0);
 	return UTF8String.Data();

src/common/utility/zstring.h

@@ -164,6 +164,10 @@ public:
 		std::swap(Chars, other.Chars);
 	}
 
+	// We do not want any implicit conversions from FString in conditionals.
+	explicit operator bool() = delete; // this is needed to render the operator const char * ineffective when used in boolean constructs.
+	bool operator !() = delete;
+
 	operator const char *() const { return Chars; }
 
 	const char *GetChars() const { return Chars; }

src/d_main.cpp

@@ -3805,7 +3805,7 @@ void I_UpdateWindowTitle()
 	switch (I_FriendlyWindowTitle)
 	{
 	case 1:
-		if (level.LevelName && level.LevelName.GetChars()[0])
+		if (level.LevelName.IsNotEmpty())
 		{
 			titlestr.Format("%s - %s", level.LevelName.GetChars(), GameStartupInfo.Name.GetChars());
 			break;

src/gamedata/d_dehacked.cpp

@@ -2375,7 +2375,7 @@ static int DoInclude (int dummy)
 
 		// Try looking for the included file in the same directory
 		// as the patch before looking in the current file.
-		const char *lastSlash = savepatchname ? strrchr (savepatchname, '/') : NULL;
+		const char *lastSlash = strrchr(savepatchname, '/');
 		char *path = data;
 
 		if (lastSlash != NULL)

src/intermission/intermission.cpp

@@ -236,12 +236,9 @@ void DIntermissionScreen::Drawer ()
 		if (CheckOverlay(i))
 			DrawTexture(twod, TexMan.GetGameTexture(mOverlays[i].mPic), mOverlays[i].x, mOverlays[i].y, DTA_320x200, true, TAG_DONE);
 	}
-	if (mSubtitle)
+	const char *sub = mSubtitle.GetChars();
-	{
+	if (sub && *sub == '$') sub = GStrings[sub + 1];
-		const char *sub = mSubtitle.GetChars();
+	if (sub) DrawFullscreenSubtitle(sub);
-		if (sub && *sub == '$') sub = GStrings[sub + 1];
-		if (sub) DrawFullscreenSubtitle(sub);
-	}
 }
 
 void DIntermissionScreen::OnDestroy()