Clean up decal behavior

Only update the mesh if a decal was truly created/destroyed

src/common/rendering/hwrenderer/data/hw_collision.cpp

@@ -85,11 +85,14 @@ void CPUAccelStruct::FindFirstHit(const RayBBox& ray, int a, TraceHit* hit)
 	}
 }
 
+extern glcycle_t DynamicBLASTime;
+
 void CPUAccelStruct::Update()
 {
 	if (Mesh->UploadRanges.Index.Size() == 0)
 		return;
 
+	DynamicBLASTime.ResetAndClock();
 	InstanceCount = (Mesh->Mesh.IndexCount + IndexesPerBLAS - 1) / IndexesPerBLAS;
 
 	bool needsUpdate[32] = {};
@@ -112,6 +115,7 @@ void CPUAccelStruct::Update()
 			DynamicBLAS[instance] = CreateBLAS(indexStart, indexEnd - indexStart);
 		}
 	}
+	DynamicBLASTime.Unclock();
 
 	CreateTLAS();
 	Upload();

src/gamedata/decallib.cpp

@@ -986,6 +986,19 @@ void FDecalTemplate::ApplyToDecal (DBaseDecal *decal, side_t *wall) const
 	{
 		Animator->CreateThinker (decal, wall);
 	}
+
+	decal->Side = wall;
+	decal->WallPrev = wall->AttachedDecals;
+
+	while (decal->WallPrev != nullptr && decal->WallPrev->WallNext != nullptr)
+	{
+		decal->WallPrev = decal->WallPrev->WallNext;
+	}
+	if (decal->WallPrev != nullptr) decal->WallPrev->WallNext = decal;
+	else wall->AttachedDecals = decal;
+	decal->WallNext = nullptr;
+
+	LevelMeshUpdater->SideDecalsChanged(wall);
 }
 
 const FDecalTemplate *FDecalTemplate::GetDecal () const

src/playsim/a_decals.cpp

@@ -255,19 +255,8 @@ void DBaseDecal::SetShade (int r, int g, int b)
 
 FTextureID DBaseDecal::StickToWall (side_t *wall, double x, double y, F3DFloor *ffloor)
 {
-	Side = wall;
-	WallPrev = wall->AttachedDecals;
-
-	while (WallPrev != nullptr && WallPrev->WallNext != nullptr)
-	{
-		WallPrev = WallPrev->WallNext;
-	}
-	if (WallPrev != nullptr) WallPrev->WallNext = this;
-	else wall->AttachedDecals = this;
-	WallNext = nullptr;
-
-	LevelMeshUpdater->SideDecalsChanged(wall);
-
+	Side = nullptr;
+	WallNext = WallPrev = nullptr;
 
 	sector_t *front, *back;
 	line_t *line;

src/rendering/hwrenderer/doom_levelmesh.cpp

@@ -55,6 +55,7 @@ static int InvalidateLightmap()
 }
 
 glcycle_t ProcessLevelMesh;
+glcycle_t DynamicBLASTime;
 
 ADD_STAT(lightmap)
 {
@@ -84,6 +85,7 @@ ADD_STAT(lightmap)
 		"Surface pixel area to update: %u\n"
 		"Surface pixel area: %u\nAtlas pixel area:   %u\n"
 		"Atlas efficiency: %.4f%%\n"
+		"Dynamic BLAS time: %2.3f ms\n"
 		"Level mesh process time: %2.3f ms\n"
 		"Level mesh index buffer: %d K used (%d%%)",
 		stats.tiles.total, stats.tiles.dirty,
@@ -91,6 +93,7 @@ ADD_STAT(lightmap)
 		stats.pixels.total,
 		atlasPixelCount,
 		float(stats.pixels.total) / float(atlasPixelCount) * 100.0f,
+		DynamicBLASTime.TimeMS(),
 		ProcessLevelMesh.TimeMS(),
 		indexBufferUsed / 1000,
 		indexBufferUsed * 100 / indexBufferTotal);