some more hooks, to add extra models

drawing.cpp

@@ -310,12 +310,15 @@ bool knowgood;
 hyperpoint goodpoint;
 vector<pair<int, hyperpoint>> tofix;
 
+EX hookset<int()> hooks_two_sided_model;
+
 EX bool two_sided_model() {
   #if CAP_VR
   bool in_vr = vrhr::rendering();
   #else
   constexpr bool in_vr = false;
   #endif
+  auto i = callhandlers(0, hooks_two_sided_model); if(i) return i > 0;
   if(GDIM == 3) return false;
   if(in_vr_sphere) return true;
   if(pmodel == mdHemisphere || pmodel == mdHyperboloid) return !in_vr;
@@ -328,7 +331,11 @@ EX bool two_sided_model() {
   return false;
   }
 
+EX hookset<int(const hyperpoint& H)> hooks_get_side;
+
 EX int get_side(const hyperpoint& H) {
+  int i = callhandlers(0, hooks_get_side, H);
+  if(i) return i;
   #if CAP_VR
   if(in_vr_sphere) {
     hyperpoint Hscr;
@@ -2462,8 +2469,12 @@ EX void set_vr_sphere() {
 
 EX int hemi_side = 0;
 
+EX hookset<bool()> hooks_draw_main;
+
 EX void draw_main() {
   DEBBI(debug_graph, ("draw_main"));
+
+  if(callhandlers(false, hooks_draw_main)) return;
   
   if(pconf.back_and_front == 1 && vid.consider_shader_projection) {
     dynamicval<int> pa(pconf.back_and_front);

hypgraph.cpp

@@ -2874,15 +2874,17 @@ void queuestraight(hyperpoint X, int style, color_t lc, color_t fc, PPR p) {
     } */
   }
 
+#if HDR
 /** ball is written as cspin(0, 1, alpha) * cspin(2, 1, beta) * cspin(0, 2, gamma) */
 struct ball_deconstruct {
   ld alpha, beta, gamma;
   transmatrix talpha, tbeta, tgamma, igamma;
   ld cos_beta, sin_beta;
   };
+#endif
 
 /** create a ball_deconstruct object */
-ball_deconstruct deconstruct_ball() {
+EX ball_deconstruct deconstruct_ball() {
   // (0,1,0) -> (0, cos beta, sin beta) -> (sin alpha, cos beta * cos alpha, sin beta)
   hyperpoint h = pconf.ball() * point3(0, 1, 0);
   ball_deconstruct d;
@@ -2901,8 +2903,12 @@ ball_deconstruct deconstruct_ball() {
   return d;
   }
 
+EX hookset<bool(int)> hooks_draw_boundary;
+
 EX void draw_boundary(int w) {
 
+  if(callhandlers(false, hooks_draw_boundary, w)) return;
+
   if((nonisotropic || gproduct) && pmodel == mdDisk) {
     queuecircle(current_display->xcenter, current_display->ycenter, current_display->radius, ringcolor, PPR::OUTCIRCLE, modelcolor);
     return;