# HG changeset patch
# User Adam Kaminski <kaminskiadam9@gmail.com>
# Date 1643937242 18000
#      Thu Feb 03 20:14:02 2022 -0500
# Node ID c7e616baee77c645b50ca34c2aa47b1a95577568
# Parent  14983b3f8a580aeac7d91046570b851d92a710f1
Added CVars: "con_interpolate" and "con_speed" which interpolates and controls how fast the console moves. Based on featues from ZCC.

diff -r 14983b3f8a58 -r c7e616baee77 src/c_console.cpp
--- a/src/c_console.cpp	Tue Feb 01 09:35:13 2022 -0500
+++ b/src/c_console.cpp	Thu Feb 03 20:14:02 2022 -0500
@@ -77,6 +77,7 @@
 #include "gi.h"
 #include "sv_rcon.h"
 #include "st_hud.h"
+#include "r_utility.h"
 
 #define CONSOLESIZE	16384	// Number of characters to store in console
 #define CONSOLELINES 256	// Max number of lines of console text
@@ -110,6 +111,10 @@
 int			CursorTicker;
 constate_e	ConsoleState = c_up;
 
+// [AK] In case we interpolate the console, we need to save an old copy of ConBottom
+// so that we can restore the old vale after drawing the console.
+static int	SavedConBottom;
+
 // [TP] Some functions print result directly to console.. when we need it to a string
 // instead. To keep as much ZDoom code unchanged, here's a hack to capture the result
 // into a string instead.
@@ -228,6 +233,16 @@
 // [AK] Add a timestamp to every line printed to the console.
 CVAR (Bool, con_showtimestamps, false, CVAR_ARCHIVE)
 
+// [AK] Interpolates the movement of the console. This doesn't work if the game is paused.
+CVAR (Bool, con_interpolate, true, CVAR_ARCHIVE)
+
+// [AK] Controls how fast the console moves.
+CUSTOM_CVAR (Int, con_speed, 25, CVAR_ARCHIVE)
+{
+	if ( self < 1 )
+		self = 1;
+}
+
 // [BB] Add a timestamp to every string printed to the logfile.
 CVAR (Bool, sv_logfiletimestamp, true, CVAR_ARCHIVE)
 
@@ -1254,21 +1269,31 @@
 	{
 		if (ConsoleState == c_falling)
 		{
-			ConBottom += (gametic - lasttic) * (SCREENHEIGHT*2/25);
+			// [AK] Change ConBottom based on con_speed rather than a constant value of 25.
+			ConBottom += (gametic - lasttic) * (SCREENHEIGHT*2/con_speed);
 			if (ConBottom >= SCREENHEIGHT / 2)
 			{
 				ConBottom = SCREENHEIGHT / 2;
 				ConsoleState = c_down;
 			}
+
+			// [AK] Save a copy of the current value of ConBottom in case
+			// we want to interpolate the console.
+			SavedConBottom = ConBottom;
 		}
 		else if (ConsoleState == c_rising)
 		{
-			ConBottom -= (gametic - lasttic) * (SCREENHEIGHT*2/25);
+			// [AK] Change ConBottom based on con_speed rather than a constant value of 25.
+			ConBottom -= (gametic - lasttic) * (SCREENHEIGHT*2/con_speed);
 			if (ConBottom <= 0)
 			{
 				ConsoleState = c_up;
 				ConBottom = 0;
 			}
+
+			// [AK] Save a copy of the current value of ConBottom in case
+			// we want to interpolate the console.
+			SavedConBottom = ConBottom;
 		}
 	}
 
@@ -1409,6 +1434,13 @@
 	if ( NETWORK_GetState( ) == NETSTATE_SERVER )
 		return;
 
+	// [AK] Interpolate the console while it's moving if we want to.
+	if ((con_interpolate) && (ConsoleState == c_falling || ConsoleState == c_rising))
+	{
+		int offset = static_cast<int>(FIXED2FLOAT(r_TicFrac) * static_cast<float>(SCREENHEIGHT * 2 / con_speed));
+		ConBottom = clamp<int>(SavedConBottom + offset * (ConsoleState == c_falling ? 1 : -1), 0, SCREENHEIGHT / 2);
+	}
+
 	left = LEFTMARGIN;
 	lines = (ConBottom-ConFont->GetHeight()*2)/ConFont->GetHeight();
 	if (-ConFont->GetHeight() + lines*ConFont->GetHeight() > ConBottom - ConFont->GetHeight()*7/2)
@@ -1607,6 +1639,10 @@
 			}
 		}
 	}
+
+	// [AK] Restore the saved value of ConBottom in case we interpolated the console.
+	if (ConsoleState == c_falling || ConsoleState == c_rising)
+		ConBottom = SavedConBottom;
 }
 
 void C_FullConsole ()