Fix missing particles in true color mode

src/r_draw.h

@@ -570,12 +570,15 @@ public:
 		}
 	}
 	
-	// Redirects all drawing commands to worker threads until Finish is called
+	// Redirects all drawing commands to worker threads until End is called
 	// Begin/End blocks can be nested.
 	static void Begin();
 
-	// Wait until all worker threads finished executing commands
+	// End redirection and wait until all worker threads finished executing
 	static void End();
+
+	// Waits until all worker threads finished executing
+	static void WaitForWorkers();
 };
 
 #endif

src/r_draw_rgba.cpp

@@ -97,6 +97,11 @@ void DrawerCommandQueue::End()
 		queue->threaded_render--;
 }
 
+void DrawerCommandQueue::WaitForWorkers()
+{
+	Instance()->Finish();
+}
+
 void DrawerCommandQueue::Finish()
 {
 	auto queue = Instance();

src/r_things.cpp

@@ -2687,6 +2687,8 @@ void R_DrawParticle_RGBA(vissprite_t *vis)
 
 	R_DrawMaskedSegsBehindParticle(vis);
 	
+	DrawerCommandQueue::WaitForWorkers();
+
 	uint32_t fg = shade_pal_index_simple(color, calc_light_multiplier(LIGHTSCALE(0, vis->Style.ColormapNum << FRACBITS)));
 	uint32_t fg_red = (fg >> 16) & 0xff;
 	uint32_t fg_green = (fg >> 8) & 0xff;