feat: Groundspeed Hud Gain (p2sr#342)

* added ground speed delta, todo: make delta toggleable (potentially change HUD_ELEMENT2 to HUD_ELEMENT_MODE2

* change sar_hud_groundspeed to HUD_ELEMENT_MODE2

* docs: cvars

Author: ellzie

docs/cvars.md

@@ -261,7 +261,7 @@
 |sar_hud_ghost_spec|0|Show the name of the ghost you're currently spectating.|
 |sar_hud_grounded|0|Draws the state of player being on ground.|
 |sar_hud_groundframes|0|Draws the number of ground frames since last landing. Setting it to 2 preserves the value.|
-|sar_hud_groundspeed|0|Draw the speed of the player upon leaving the ground.|
+|sar_hud_groundspeed|0|Draw the speed of the player upon leaving the ground.<br>0 = Default,<br>1 = Groundspeed,<br>2 = Groundspeed (Gain)|
 |sar_hud_hide_text|cmd|sar_hud_hide_text \<id\|all> - hides the nth text value in the HUD|
 |sar_hud_inspection|0|Draws entity inspection data.|
 |sar_hud_jump|0|Draws current jump distance.|

src/Features/Hud/Hud.cpp

@@ -761,10 +761,15 @@ HUD_ELEMENT_MODE2(velang, "0", 0, 2,
 		ctx->DrawElement("velang: -");
 	}
 }
-HUD_ELEMENT2(groundspeed, "0", "Draw the speed of the player upon leaving the ground.\n", HudType_InGame | HudType_Paused | HudType_LoadingScreen) {
+HUD_ELEMENT_MODE2(groundspeed, "0", 0, 2, "Draw the speed of the player upon leaving the ground.\n"
+				"0 = Default\n"
+				"1 = Groundspeed\n"
+				"2 = Groundspeed (Gain)\n", 
+				HudType_InGame | HudType_Paused | HudType_LoadingScreen) {
 	static float speeds[2];
 	static float drawSpeeds[2];
 	static bool groundeds[2];
+	static float lastSpeeds[2] = {0};
 
 	auto player = client->GetPlayer(ctx->slot + 1);
 	if (!player) {
@@ -779,10 +784,15 @@ HUD_ELEMENT2(groundspeed, "0", "Draw the speed of the player upon leaving the gr
 		speeds[ctx->slot] = client->GetLocalVelocity(player).Length();
 	} else if (groundeds[ctx->slot]) {
 		groundeds[ctx->slot] = false;
+		lastSpeeds[ctx->slot] = drawSpeeds[ctx->slot];
 		drawSpeeds[ctx->slot] = speeds[ctx->slot];
 	}
-
-	ctx->DrawElement("groundspeed: %.*f", getPrecision(true), drawSpeeds[ctx->slot]);
+	if (mode == 2) {
+		ctx->DrawElement("groundspeed: %.*f (%.*f)", getPrecision(true), drawSpeeds[ctx->slot], getPrecision(true), drawSpeeds[ctx->slot] - lastSpeeds[ctx->slot]);
+	} else {
+		ctx->DrawElement("groundspeed: %.*f", getPrecision(true), drawSpeeds[ctx->slot]);
+	}
+	
 }
 QAngle g_bluePortalAngles[2];
 QAngle g_orangePortalAngles[2];