- reverted the counter for the vertex angle cache to a simple incrementing global variable.

Using I_MSTime is not precise enough, because some camera textures can be done quicker. It was pointless anyway trying to make this multithreading-safe, the entire caching idea here makes no sense if two clippers can simultaneously work on the same level data without changing the memory organization and rendering it ineffective.

src/gl/scene/gl_clipper.cpp

@@ -38,10 +38,11 @@
 #include "gl/scene/gl_clipper.h"
 #include "g_levellocals.h"
 
+unsigned Clipper::starttime;
 
 Clipper::Clipper()
 {
-	starttime = I_MSTime();
+	starttime++;
 }
 
 //-----------------------------------------------------------------------------
@@ -94,7 +95,7 @@ void Clipper::Clear()
 	
 	cliphead = NULL;
 	silhouette = NULL;
-	starttime = I_MSTime();
+	starttime++;
 }
 
 //-----------------------------------------------------------------------------

src/gl/scene/gl_clipper.h

@@ -30,7 +30,7 @@ class ClipNode
 
 class Clipper
 {
-	unsigned starttime;
+	static unsigned starttime;
 	FMemArena nodearena;
 	ClipNode * freelist = nullptr;