Remove ERR_EXPLAIN in favor of *_MSG macros

Fixes build against Godot 3.2.beta, namely: godotengine/godot#33517.

clipper.cpp

@@ -38,8 +38,7 @@ void Clipper::add_points(const Vector<Vector2> &points) {
 
 void Clipper::execute(bool build_hierarchy) {
 
-	ERR_EXPLAIN("Cannot build hierarchy outside of MODE_CLIP");
-	ERR_FAIL_COND(build_hierarchy && mode != MODE_CLIP)
+	ERR_FAIL_COND_MSG(build_hierarchy && mode != MODE_CLIP, "Cannot build hierarchy outside of MODE_CLIP");
 
 	switch (mode) {
 
@@ -81,20 +80,12 @@ int Clipper::get_solution_count(SolutionType type) const {
 Vector<Vector2> Clipper::get_solution(int idx, SolutionType type) {
 
 	switch (type) {
-
 		case TYPE_CLOSED: {
-
-			ERR_EXPLAIN("Closed solution not found");
-			ERR_FAIL_INDEX_V(idx, solution_closed.size(), Vector<Vector2>());
-
+			ERR_FAIL_INDEX_V_MSG(idx, solution_closed.size(), Vector<Vector2>(), "Closed solution not found");
 			return _scale_down(solution_closed[idx], PRECISION);
 		} break;
-
 		case TYPE_OPEN: {
-
-			ERR_EXPLAIN("Open solution not found");
-			ERR_FAIL_INDEX_V(idx, solution_open.size(), Vector<Vector2>());
-
+			ERR_FAIL_INDEX_V_MSG(idx, solution_open.size(), Vector<Vector2>(), "Open solution not found");
 			return _scale_down(solution_open[idx], PRECISION);
 		} break;
 	}
@@ -103,8 +94,7 @@ Vector<Vector2> Clipper::get_solution(int idx, SolutionType type) {
 
 Rect2 Clipper::get_bounds() {
 
-	ERR_EXPLAIN("Cannot get solution bounds in MODE_OFFSET");
-	ERR_FAIL_COND_V(mode == MODE_OFFSET, Rect2());
+	ERR_FAIL_COND_V_MSG(mode == MODE_OFFSET, Rect2(), "Cannot get solution bounds in MODE_OFFSET");
 
 	cl::Rect64 b(0, 0, 0, 0);
 

thirdparty/clipper2/clipper.cpp

@@ -592,9 +592,7 @@ namespace clipperlib {
   void Clipper::AddPath(const Path &path, PathType polytype, bool is_open)
   {
     if (is_open) {
-      ERR_EXPLAINC("AddPath: Only subject paths may be open.");
-      ERR_FAIL_COND(polytype == ptClip)
-
+      ERR_FAIL_COND_MSG(polytype == ptClip,"AddPath: Only subject paths may be open.")
       has_open_paths_ = true;
     }
     minima_list_sorted_ = false;
@@ -968,8 +966,7 @@ namespace clipperlib {
 
   void Clipper::AddLocalMaxPoly(Active &e1, Active &e2, const Point64 pt)
   {
-    ERR_EXPLAINC("Error in AddLocalMaxPoly().");
-    ERR_FAIL_COND(!IsHotEdge(e2))
+    ERR_FAIL_COND_MSG(!IsHotEdge(e2), "Error in AddLocalMaxPoly().");
 
     AddOutPt(e1, pt);
     if (e1.outrec == e2.outrec) {
@@ -994,8 +991,7 @@ namespace clipperlib {
         SwapSides(*e2.outrec);
       }
       else if (!FixOrientation(e1) && !FixOrientation(e2)) {
-        ERR_EXPLAINC("Error in JoinOutrecPaths()");
-        ERR_FAIL();
+        ERR_FAIL_MSG("Error in JoinOutrecPaths()");
       }
 
       if (e1.outrec->owner == e2.outrec) e1.outrec->owner = e2.outrec->owner;