Re-added A_SpriteOffset with a fix to improve performance, and give support for wall and flat sprites.

src/playsim/actor.h

@@ -989,6 +989,7 @@ public:
 
 	DVector3		OldRenderPos;
 	DVector3		Vel;
+	DVector2		SpriteOffset;
 	double			Speed;
 	double			FloatSpeed;
 

src/playsim/p_mobj.cpp

@@ -366,7 +366,8 @@ void AActor::Serialize(FSerializer &arc)
 		A("spawntime", SpawnTime)
 		A("spawnorder", SpawnOrder)
 		A("friction", Friction)
-		A("userlights", UserLights);
+		A("userlights", UserLights)
+		A("SpriteOffset", SpriteOffset);
 }
 
 #undef A

src/rendering/hwrenderer/scene/hw_sprites.cpp

@@ -846,12 +846,11 @@ void HWSprite::Process(HWDrawInfo *di, AActor* thing, sector_t * sector, area_t
 			thing->renderflags ^= RF_XFLIP;
 
 		r.Scale(sprscale.X, sprscale.Y);
-
-		float rightfac = -r.left;
+		
+		float SpriteOffY = thing->SpriteOffset.Y;
+		float rightfac = -r.left - thing->SpriteOffset.X;
 		float leftfac = rightfac - r.width;
-		float bottomfac = -r.top;
-		float topfac = bottomfac - r.height;
-		z1 = z - r.top;
+		z1 = z - r.top - SpriteOffY;
 		z2 = z1 - r.height;
 
 		float spriteheight = sprscale.Y * r.height;
@@ -862,31 +861,39 @@ void HWSprite::Process(HWDrawInfo *di, AActor* thing, sector_t * sector, area_t
 			PerformSpriteClipAdjustment(thing, thingpos, spriteheight);
 		}
 
-		float viewvecX;
-		float viewvecY;
 		switch (spritetype)
 		{
 		case RF_FACESPRITE:
-			viewvecX = vp.ViewVector.X;
-			viewvecY = vp.ViewVector.Y;
+		{
+			float viewvecX = vp.ViewVector.X;
+			float viewvecY = vp.ViewVector.Y;
 
 			x1 = x - viewvecY*leftfac;
 			x2 = x - viewvecY*rightfac;
 			y1 = y + viewvecX*leftfac;
 			y2 = y + viewvecX*rightfac;
 			break;
-
+		}
 		case RF_FLATSPRITE:
 		{
+			float bottomfac = -r.top - SpriteOffY;
+			float topfac = bottomfac - r.height;
+
 			x1 = x + leftfac;
 			x2 = x + rightfac;
 			y1 = y - topfac;
 			y2 = y - bottomfac;
+			// [MC] Counteract in case of any potential problems. Tests so far haven't
+			// shown any outstanding issues but that doesn't mean they won't appear later
+			// when more features are added.
+			z1 += SpriteOffY;
+			z2 += SpriteOffY;
+			break;
 		}
-		break;
 		case RF_WALLSPRITE:
-			viewvecX = Angles.Yaw.Cos();
-			viewvecY = Angles.Yaw.Sin();
+		{
+			float viewvecX = Angles.Yaw.Cos();
+			float viewvecY = Angles.Yaw.Sin();
 
 			x1 = x + viewvecY*leftfac;
 			x2 = x + viewvecY*rightfac;
@@ -894,6 +901,7 @@ void HWSprite::Process(HWDrawInfo *di, AActor* thing, sector_t * sector, area_t
 			y2 = y - viewvecX*rightfac;
 			break;
 		}
+		}
 	}
 	else
 	{

src/rendering/polyrenderer/scene/poly_sprite.cpp

@@ -66,6 +66,8 @@ bool RenderPolySprite::GetLine(AActor *thing, DVector2 &left, DVector2 &right)
 	else
 		offsetX = tex->GetLeftOffsetPo() * thingxscalemul;
 
+	offsetX -= thing->SpriteOffset.X;
+
 	left = DVector2(pos.X - viewpoint.Sin * offsetX, pos.Y + viewpoint.Cos * offsetX);
 	right = DVector2(left.X + viewpoint.Sin * spriteWidth, left.Y - viewpoint.Cos * spriteWidth);
 	return true;
@@ -113,7 +115,7 @@ void RenderPolySprite::Render(PolyRenderThread *thread, AActor *thing, subsector
 	double spriteHeight = thingyscalemul * tex->GetHeight();
 
 	posZ -= (tex->GetHeight() - tex->GetTopOffsetPo()) * thingyscalemul;
-	posZ = PerformSpriteClipAdjustment(thing, thingpos, spriteHeight, posZ);
+	posZ = PerformSpriteClipAdjustment(thing, thingpos, spriteHeight, posZ) - thing->SpriteOffset.Y;
 
 	//double depth = 1.0;
 	//visstyle_t visstyle = GetSpriteVisStyle(thing, depth);

src/rendering/polyrenderer/scene/poly_wallsprite.cpp

@@ -37,7 +37,7 @@ void RenderPolyWallSprite::Render(PolyRenderThread *thread, AActor *thing, subse
 
 	const auto &viewpoint = PolyRenderer::Instance()->Viewpoint;
 	DVector3 pos = thing->InterpolatedPosition(viewpoint.TicFrac);
-	pos.Z += thing->GetBobOffset(viewpoint.TicFrac);
+	pos.Z += thing->GetBobOffset(viewpoint.TicFrac) - thing->SpriteOffset.Y;
 
 	bool flipTextureX = false;
 	FSoftwareTexture *tex = RenderPolySprite::GetSpriteTexture(thing, flipTextureX);
@@ -56,7 +56,7 @@ void RenderPolyWallSprite::Render(PolyRenderThread *thread, AActor *thing, subse
 	// Determine left and right edges of sprite. The sprite's angle is its normal,
 	// so the edges are 90 degrees each side of it.
 	double x2 = tex->GetScaledWidth() * spriteScale.X;
-	double x1 = tex->GetScaledLeftOffsetPo() * spriteScale.X;
+	double x1 = (tex->GetScaledLeftOffsetPo() * spriteScale.X) - thing->SpriteOffset.X;
 	DVector2 left, right;
 	left.X = pos.X - x1 * angcos;
 	left.Y = pos.Y - x1 * angsin;

src/rendering/swrenderer/scene/r_opaque_pass.cpp

@@ -1002,9 +1002,9 @@ namespace swrenderer
 
 	bool RenderOpaquePass::GetThingSprite(AActor *thing, ThingSprite &sprite)
 	{
+		// The X offsetting (SpriteOffset.X) is performed in r_sprite.cpp, in RenderSprite::Project().
 		sprite.pos = thing->InterpolatedPosition(Thread->Viewport->viewpoint.TicFrac);
-		sprite.pos.Z += thing->GetBobOffset(Thread->Viewport->viewpoint.TicFrac);
-
+		sprite.pos.Z += thing->GetBobOffset(Thread->Viewport->viewpoint.TicFrac) - thing->SpriteOffset.Y;
 		sprite.spritenum = thing->sprite;
 		sprite.tex = nullptr;
 		sprite.voxel = nullptr;

src/rendering/swrenderer/things/r_sprite.cpp

@@ -95,6 +95,9 @@ namespace swrenderer
 		}
 		//tx2 = tx >> 4;
 
+		// The Y offsetting is done in r_opaque_pass.cpp, in RenderOpaquePass::GetThingSprite().
+		tx += thing->SpriteOffset.X;
+
 		// too far off the side?
 		if (fabs(tx / 64) > fabs(tz))
 		{

src/scripting/vmthunks_actors.cpp

@@ -1711,6 +1711,7 @@ DEFINE_FIELD_NAMED(AActor, __Pos, pos)
 DEFINE_FIELD_NAMED(AActor, __Pos.X, x)
 DEFINE_FIELD_NAMED(AActor, __Pos.Y, y)
 DEFINE_FIELD_NAMED(AActor, __Pos.Z, z)
+DEFINE_FIELD(AActor, SpriteOffset)
 DEFINE_FIELD(AActor, Prev)
 DEFINE_FIELD(AActor, SpriteAngle)
 DEFINE_FIELD(AActor, SpriteRotation)

wadsrc/static/zscript/actors/actions.zs

@@ -95,4 +95,9 @@ extend class Actor
 		}
 	}
 
+	void A_SpriteOffset(double ox = 0.0, double oy = 0.0)
+	{
+		SpriteOffset.X = ox;
+		SpriteOffset.Y = oy;
+	}
 }

wadsrc/static/zscript/actors/actor.zs

@@ -89,6 +89,7 @@ class Actor : Thinker native
 	native PlayerInfo Player;
 	native readonly vector3 Pos;
 	native vector3 Prev;
+	native vector2 SpriteOffset;
 	native double spriteAngle;
 	native double spriteRotation;
 	native double VisibleStartAngle;