Added code for rotating the PSprite, courtesy of IvanDobrovski.

- However, the XY offsets are relative as a result.This must be made toggleable.

src/playsim/p_pspr.cpp

@@ -142,8 +142,6 @@ DEFINE_FIELD(DPSprite, oldscalex)
 DEFINE_FIELD(DPSprite, oldscaley)
 DEFINE_FIELD(DPSprite, rotation)
 DEFINE_FIELD(DPSprite, oldrotation)
-DEFINE_FIELD(DPSprite, PivotPercent)
-DEFINE_FIELD(DPSprite, PivotScreen)
 DEFINE_FIELD(DPSprite, firstTic)
 DEFINE_FIELD(DPSprite, Tics)
 DEFINE_FIELD(DPSprite, Translation)
@@ -157,6 +155,7 @@ DEFINE_FIELD_BIT(DPSprite, Flags, bMirror, PSPF_MIRROR)
 DEFINE_FIELD_BIT(DPSprite, Flags, bPlayerTranslated, PSPF_PLAYERTRANSLATED)
 DEFINE_FIELD_BIT(DPSprite, Flags, bPivotPercent, PSPF_PIVOTPERCENT)
 DEFINE_FIELD_BIT(DPSprite, Flags, bPivotScreen, PSPF_PIVOTSCREEN)
+DEFINE_FIELD_BIT(DPSprite, Flags, bPivotOffsetRel, PSPF_PIVOTOFFSETREL)
 
 //------------------------------------------------------------------------
 //
@@ -185,7 +184,8 @@ DPSprite::DPSprite(player_t *owner, AActor *caller, int id)
   oldpx(.0), oldpy(.0),
   oldrotation(.0),
   PivotPercent(true),
-  PivotScreen(false)
+  PivotScreen(false),
+  PivotOffsetRel(false)
 {
 	alpha = 1;
 	Renderstyle = STYLE_Normal;

src/playsim/p_pspr.h

@@ -73,6 +73,7 @@ enum PSPFlags
 	PSPF_PLAYERTRANSLATED = 1 << 10,
 	PSPF_PIVOTPERCENT	= 1 << 11,
 	PSPF_PIVOTSCREEN	= 1 << 12,
+	PSPF_PIVOTOFFSETREL	= 1 << 13,
 };
 
 class DPSprite : public DObject
@@ -101,6 +102,7 @@ public:
 
 	bool PivotScreen;		// If true, the pivot is based on the entire screen width/height instead of the image's dimensions/position.
 	bool PivotPercent;		// If true, the pivot goes between [0.0, 1.0]. Otherwise, it's a pixel position offset from the image size.
+	bool PivotOffsetRel;	// If true, x & y are relative to rotation. Otherwise, x is left/right and y is up/down.
 	double px, py;			// pivot points
 	double oldpx, oldpy;	
 	double rotation;		// How much rotation to apply.

src/rendering/hwrenderer/scene/hw_weapon.cpp

@@ -485,28 +485,66 @@ bool HUDSprite::GetWeaponRect(HWDrawInfo *di, DPSprite *psp, float sx, float sy,
 	auto verts = screen->mVertexData->AllocVertices(4);
 	mx = verts.second;
 
-
+	// [MC] Code copied from DTA_Rotate
+	// Big thanks to IvanDobrovski who helped me modify this.
 	if (psp->rotation != 0.0 || psp->scalex != 1.0 || psp->scaley != 1.0)
 	{
-		double radang = psp->rotation * (pi::pi() / 180.);
-		double cosang = cos(radang);
-		double sinang = sin(radang);
+		float radang = psp->rotation * (pi::pi() / 180.);
+		float cosang = -cos(radang);
+		float sinang = -sin(radang);
 
-		double xcenter = psp->x;
-		double ycenter = psp->y;
+		float xcenter, ycenter;
 
+		float px = float(psp->px);
+		float py = float(psp->py);
 
-		double xx1 = xcenter + psp->scalex * (x1 * cosang + y1 * sinang);
-		double yy1 = ycenter + psp->scaley * (x1 * sinang - y1 * cosang);
+		if (psp->Flags & PSPF_PIVOTSCREEN)
+		{
+			if (psp->Flags & PSPF_PIVOTPERCENT)
+			{
+				xcenter = vw * psp->px + viewwindowx + psp->x;
+				ycenter = vh * psp->py + viewwindowy + psp->y;
+			}
+			else
+			{
+				xcenter = vw * 0.5 + viewwindowx + psp->x + psp->px;
+				ycenter = vh * 0.5 + viewwindowy + psp->y + psp->py;
+			}
+		}
+		else
+		{
+			if (psp->Flags & PSPF_PIVOTPERCENT)
+			{
+				xcenter = (x1 + x2) * psp->px + psp->x;
+				ycenter = (y1 + y2) * psp->py + psp->y;
+			}
+			else
+			{
+				xcenter = ((x1 + x2) * 0.5 + psp->x) + psp->px;
+				ycenter = ((x1 + x2) * 0.5 + psp->y) + psp->py;
+			}
+		}
 
-		double xx2 = xcenter + psp->scalex * (x1 * cosang + y2 * sinang);
-		double yy2 = ycenter + psp->scaley * (x1 * sinang - y2 * cosang);
+		x1 -= xcenter;
+		y1 -= ycenter;
 
-		double xx3 = xcenter + psp->scalex * (x2 * cosang + y1 * sinang);
-		double yy3 = ycenter + psp->scaley * (x2 * sinang - y1 * cosang);
+		x2 -= xcenter;
+		y2 -= ycenter;
 
-		double xx4 = xcenter + psp->scalex * (x2 * cosang + y2 * sinang);
-		double yy4 = ycenter + psp->scaley * (x2 * sinang - y2 * cosang);
+		float ssx = (float)psp->scalex;
+		float ssy = (float)psp->scaley;
+
+		float xx1 = xcenter + ssx * (x1 * cosang + y1 * sinang);
+		float yy1 = ycenter + ssy * (x1 * sinang - y1 * cosang);
+
+		float xx2 = xcenter + ssx * (x1 * cosang + y2 * sinang);
+		float yy2 = ycenter + ssy * (x1 * sinang - y2 * cosang);
+
+		float xx3 = xcenter + ssx * (x2 * cosang + y1 * sinang);
+		float yy3 = ycenter + ssy * (x2 * sinang - y1 * cosang);
+
+		float xx4 = xcenter + ssx * (x2 * cosang + y2 * sinang);
+		float yy4 = ycenter + ssy * (x2 * sinang - y2 * cosang);
 
 		verts.first[0].Set(xx1, yy1, 0, u1, v1);
 		verts.first[1].Set(xx2, yy2, 0, u1, v2);
@@ -515,7 +553,6 @@ bool HUDSprite::GetWeaponRect(HWDrawInfo *di, DPSprite *psp, float sx, float sy,
 	}
 	else
 	{
-
 		verts.first[0].Set(x1, y1, 0, u1, v1);
 		verts.first[1].Set(x1, y2, 0, u1, v2);
 		verts.first[2].Set(x2, y1, 0, u2, v1);

wadsrc/static/zscript/actors/player/player.zs

@@ -2580,6 +2580,7 @@ class PSprite : Object native play
 	native bool bPlayerTranslated;
 	native bool bPivotPercent;
 	native bool bPivotScreen;
+	native bool bPivotOffsetRel;
 
 	native void SetState(State newstate, bool pending = false);