feat: sar_trace_reveal

cinematic? useful? idk bro

Author: ThisAMJ

docs/cvars.md

@@ -661,6 +661,7 @@
 |sar_trace_portal_oval|0|Draw trace portals as ovals rather than rectangles.|
 |sar_trace_portal_record|1|Record portal locations.|
 |sar_trace_record|0|Record the trace to a slot. Set to 0 for not recording|
+|sar_trace_reveal|0|Only draw traces until the specified tick. Set to bbox to draw until the bbox tick.|
 |sar_trace_show|cmd|sar_trace_show [trace name] - show the trace with the given name|
 |sar_trace_teleport_at|cmd|sar_trace_teleport_at \<tick> [player slot] [trace name] - teleports the player at the given trace tick on the given trace ID (defaults to hovered one or the first one ever made) in the given slot (defaults to 0).|
 |sar_trace_teleport_eye|cmd|sar_trace_teleport_eye \<tick> [player slot] [trace name] - teleports the player to the eye position at the given trace tick on the given trace (defaults to hovered one or the first one ever made) in the given slot (defaults to 0).|

src/Features/PlayerTrace.cpp

@@ -39,6 +39,8 @@ Variable sar_trace_font_size("sar_trace_font_size", "3.0", 0.1, "The size of tex
 
 Variable sar_trace_vphys_record("sar_trace_vphys_record", "1", 0, 1, "Record vphysics locations of dynamic entities for analysis.\n");
 
+Variable sar_trace_reveal("sar_trace_reveal", "0", "Only draw traces until the specified tick. Set to bbox to draw until the bbox tick.\n");
+
 Variable sar_trace_bbox_at("sar_trace_bbox_at", "-1", -1, "Display a player-sized bbox at the given tick.\n");
 Variable sar_trace_bbox_use_hover("sar_trace_bbox_use_hover", "0", 0, 1, "Move trace bbox to hovered trace point tick on given trace.\n");
 Variable sar_trace_bbox_ent_record("sar_trace_bbox_ent_record", "1", "Record hitboxes of nearby entities in the trace. You may want to disable this if memory consumption gets too high.\n");
@@ -274,7 +276,14 @@ void PlayerTrace::DrawInWorld() const {
 			float speed = trace.velocities[slot][0].Length2D();
 			unsigned groundframes = trace.grounded[slot][0];
 
-			for (size_t i = 0; i < trace.positions[slot].size(); i++) {
+			size_t end_tick = trace.positions[slot].size() - 1;
+			if (sar_trace_reveal.GetInt() > 0) {
+				end_tick = (std::min)(end_tick, (size_t)tickUserToInternal(sar_trace_reveal.GetInt() + 1, trace));
+			} else if (!strcmp(sar_trace_reveal.GetString(), "bbox")) {
+				end_tick = (std::min)(end_tick, (size_t)tickUserToInternal(sar_trace_bbox_at.GetInt() + 1, trace));
+			}
+
+			for (size_t i = 0; i < end_tick; i++) {
 				Vector new_pos = trace.positions[slot][i];
 				speed = trace.velocities[slot][i].Length2D();