Put hw sprite rendering code in hw_things.c

https://git.do.srb2.org/STJr/SRB2/-/merge_requests/1773/diffs\?commit_id\=0a4a9072a88e0277edd06a7488d6013ca452102a

src/hardware/CMakeLists.txt

@@ -4,6 +4,7 @@ target_sources(BLANKART PRIVATE
 	hw_light.c
 	hw_main.c
 	hw_sky.c
+	hw_things.c
 	hw_clip.c
 	hw_md2.c
 	hw_cache.c

src/hardware/hw_glob.h

@@ -189,6 +189,17 @@ void HWR_ClearSkyDome(void);
 void HWR_BuildSkyDome(void);
 void HWR_DrawSkyBackground(player_t *player);
 
+// --------
+// hw_things.c
+// --------
+extern UINT32 gl_visspritecount;
+
+void HWR_ClearSprites(void);
+void HWR_AddSprites(sector_t *sec);
+void HWR_AddPrecipitationSprites(void);
+void HWR_SortVisSprites(void);
+void HWR_DrawSprites(void);
+void HWR_ProjectBoundingBox(mobj_t *thing);
 
 #ifdef __cplusplus
 } // extern "C"

src/hardware/hw_main.h

@@ -127,6 +127,10 @@ extern float gl_viewsin, gl_viewcos;
 
 extern angle_t dup_viewangle;
 
+extern float gl_viewx, gl_viewy, gl_viewz;
+extern float gl_viewsin, gl_viewcos;
+
+extern float gl_viewludsin, gl_viewludcos;
 
 // Render stats
 extern precise_t ps_hw_skyboxtime;