csqcplayers: network death_time

[xonotic/xonotic-data.pk3dir.git] / qcsrc / common / util.qc

diff --git a/qcsrc/common/util.qc b/qcsrc/common/util.qc
index 8f190f163cecb958f035910209175828383ae80a..356f5b3e7b6771d5bcd1b139edf95d1727962be2 100644 (file)
--- a/qcsrc/common/util.qc
+++ b/qcsrc/common/util.qc
@@ -2174,3 +2174,41 @@ void m_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 = t - time;
+
+       // 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