From e07f5fed0c766a563794bff43b337ca018ddca74 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Thu, 30 Jan 2020 17:45:51 +0100
Subject: [PATCH] dual:: when one side is Euclidean, only the other one rotates

---
 hypgraph.cpp  | 2 +-
 multigame.cpp | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/hypgraph.cpp b/hypgraph.cpp
index 5e512d6d..e2557a85 100644
--- a/hypgraph.cpp
+++ b/hypgraph.cpp
@@ -1252,7 +1252,7 @@ void hrmap_standard::draw() {
 EX void spinEdge(ld aspd) { 
   ld downspin = 0;
   auto& ds = downseek;
-  if(dual::state == 2 && dual::currently_loaded != dual::main_side) {
+  if(dual::state == 2 && (dual::one_euclidean ? !euclid : dual::currently_loaded != dual::main_side)) {
     transmatrix our   = dual::get_orientation();
     transmatrix their = dual::player_orientation[dual::main_side];
     fixmatrix(our);
diff --git a/multigame.cpp b/multigame.cpp
index 7af6faf4..7c6c0bac 100644
--- a/multigame.cpp
+++ b/multigame.cpp
@@ -107,6 +107,9 @@ EX }
 EX namespace dual {
   /** 0 = dualmode off, 1 = in dualmode (no game chosen), 2 = in dualmode (working on one of subgames) */
   EX int state;
+
+  /** exactly one side is Euclidean -- it should not be synchronized with the other side */
+  EX bool one_euclidean;
   
   EX int currently_loaded;
   EX int main_side;
@@ -332,6 +335,11 @@ EX namespace dual {
     }
 
   EX void assign_landsides() {
+    switch_to(!currently_loaded);
+    one_euclidean = euclid;
+    switch_to(!currently_loaded);
+    one_euclidean ^= euclid;
+    
     landsides.resize(landtypes);
     int which_hyperbolic = -1;
     if(ginf[dgd[0].geo].cclass == gcHyperbolic && ginf[dgd[1].geo].cclass != gcHyperbolic)