+float shutdown_running;
+#ifdef SVQC
+void SV_Shutdown()
+#endif
+#ifdef CSQC
+void CSQC_Shutdown()
+#endif
+#ifdef MENUQC
+void m_shutdown()
+#endif
+{
+ if(shutdown_running)
+ {
+ print("Recursive shutdown detected! Only restoring cvars...\n");
+ }
+ else
+ {
+ shutdown_running = 1;
+ Shutdown();
+ }
+ cvar_settemp_restore(); // this must be done LAST, but in any case
+}
+
+#define APPROXPASTTIME_ACCURACY_REQUIREMENT 0.05
+#define APPROXPASTTIME_MAX (16384 * APPROXPASTTIME_ACCURACY_REQUIREMENT)
+#define APPROXPASTTIME_RANGE (64 * APPROXPASTTIME_ACCURACY_REQUIREMENT)
+// this will use the value:
+// 128
+// accuracy near zero is APPROXPASTTIME_MAX/(256*255)
+// accuracy at x is 1/derivative, i.e.
+// APPROXPASTTIME_MAX * (1 + 256 * (dt / APPROXPASTTIME_MAX))^2 / 65536
+#ifdef SVQC
+void WriteApproxPastTime(float dst, float t)
+{
+ float dt = time - t;
+
+ // warning: this is approximate; do not resend when you don't have to!
+ // be careful with sendflags here!
+ // we want: 0 -> 0.05, 1 -> 0.1, ..., 255 -> 12.75
+
+ // map to range...
+ dt = 256 * (dt / ((APPROXPASTTIME_MAX / 256) + dt));
+
+ // round...
+ dt = rint(bound(0, dt, 255));
+
+ WriteByte(dst, dt);
+}
+#endif
+#ifdef CSQC
+float ReadApproxPastTime()
+{
+ float dt = ReadByte();
+
+ // map from range...PPROXPASTTIME_MAX / 256
+ dt = (APPROXPASTTIME_MAX / 256) * (dt / (256 - dt));
+
+ return servertime - dt;
+}
+#endif
+
+#ifndef MENUQC
+.float skeleton_bones_index;
+void Skeleton_SetBones(entity e)
+{
+ // set skeleton_bones to the total number of bones on the model
+ if(e.skeleton_bones_index == e.modelindex)
+ return; // same model, nothing to update
+
+ float skelindex;
+ skelindex = skel_create(e.modelindex);
+ e.skeleton_bones = skel_get_numbones(skelindex);
+ skel_delete(skelindex);
+ e.skeleton_bones_index = e.modelindex;
+}
+#endif
+
+string to_execute_next_frame;
+void execute_next_frame()
+{
+ if(to_execute_next_frame)
+ {
+ localcmd("\n", to_execute_next_frame, "\n");
+ strunzone(to_execute_next_frame);
+ to_execute_next_frame = string_null;
+ }
+}
+void queue_to_execute_next_frame(string s)
+{
+ if(to_execute_next_frame)
+ {
+ s = strcat(s, "\n", to_execute_next_frame);
+ strunzone(to_execute_next_frame);
+ }
+ to_execute_next_frame = strzone(s);
+}