Attract: fade out and timescale at end of demo

- Do not use a wipe so player can keep moving while fading
  out
- Timescale by half for a "slowdown" effect

src/d_main.cpp

@@ -649,6 +649,13 @@ static bool D_Display(void)
 						V_DrawCustomFadeScreen("FADEMAP0", val);
 					}
 				}
+				else if (demo.attract == DEMO_ATTRACT_TITLE)
+				{
+					if (INT32 fade = F_AttractDemoExitFade())
+					{
+						V_DrawCustomFadeScreen("FADEMAP0", fade);
+					}
+				}
 
 				VID_DisplaySoftwareScreen();
 			}

src/f_finale.c

@@ -67,6 +67,7 @@ static boolean keypressed = false;
 
 static tic_t attractcountdown; // Countdown until attract demo ends
 static boolean attractcredit; // Show music credit once attract demo begins
+boolean g_attractnowipe; // Do not wipe on return to title screen
 
 static INT32 menuanimtimer; // Title screen: background animation timing
 altview_t titlemapcam = {0};
@@ -1837,8 +1838,20 @@ void F_AttractDemoTicker(void)
 		}
 
 		if (attractcountdown > 0 && !--attractcountdown)
+		{
+			// Fade will be handled without a wipe (see F_AttractDemoExitFade)
+			g_attractnowipe = true;
 			G_CheckDemoStatus();
 		}
+	}
+}
+
+INT32 F_AttractDemoExitFade(void)
+{
+	if (attractcountdown > 15)
+		return 0;
+
+	return 31 - (attractcountdown * 2);
 }
 
 // ================

src/f_finale.h

@@ -64,6 +64,8 @@ void F_EndTextPrompt(boolean forceexec, boolean noexec);
 boolean F_GetPromptHideHudAll(void);
 boolean F_GetPromptHideHud(fixed_t y);
 
+INT32 F_AttractDemoExitFade(void);
+
 void F_StartGameEnd(void);
 void F_StartIntro(void);
 void F_StartTitleScreen(void);
@@ -128,6 +130,8 @@ extern boolean WipeStageTitle;
 
 extern INT32 lastwipetic;
 
+extern boolean g_attractnowipe;
+
 // Don't know where else to place this constant
 // But this file seems appropriate
 #define PRELEVELTIME TICRATE // frames in tics

src/i_time.c

@@ -18,6 +18,8 @@
 #include "command.h"
 #include "doomtype.h"
 #include "d_netcmd.h"
+#include "f_finale.h"
+#include "g_demo.h"
 #include "m_fixed.h"
 #include "i_system.h"
 
@@ -59,6 +61,12 @@ void I_InitializeTime(void)
 
 fixed_t I_GetTimeScale(void)
 {
+	if (demo.playback && demo.attract == DEMO_ATTRACT_TITLE && F_AttractDemoExitFade())
+	{
+		// Slow down at the end of attract demos
+		return FRACUNIT/2;
+	}
+
 	return cv_timescale.value;
 }
 

src/k_hud.cpp

@@ -52,6 +52,7 @@
 #include "k_hitlag.h"
 #include "g_input.h"
 #include "k_dialogue.h"
+#include "f_finale.h"
 
 //{ 	Patch Definitions
 static patch_t *kp_nodraw;
@@ -6097,6 +6098,33 @@ void K_drawKartHUD(void)
 			{
 				INT32 x = BASEVIDWIDTH - 8, y = BASEVIDHEIGHT-8, snapflags = V_SNAPTOBOTTOM|V_SNAPTORIGHT|V_SLIDEIN;
 				patch_t *pat = static_cast<patch_t*>(W_CachePatchName((M_UseAlternateTitleScreen() ? "MTSJUMPR1" : "MTSBUMPR1"), PU_CACHE));
+				const UINT8 *colormap = nullptr;
+
+				if (INT32 fade = F_AttractDemoExitFade())
+				{
+					// TODO: Twodee cannot handle
+					// V_DrawCustomFadeScreen.
+					// However, since the screen fade just
+					// uses a colormap, the same colormap can
+					// be applied on a per-patch basis.
+					// I'm only bothering to apply this
+					// colormap to the attract mode sticker,
+					// since it's the lone HUD element.
+					if (lighttable_t *clm = V_LoadCustomFadeMap("FADEMAP0"))
+					{
+						// This must be statically allocated for Twodee
+						static UINT8 *colormap_storage;
+						const UINT8 *fadetable = V_OffsetIntoFadeMap(clm, fade);
+
+						if (!colormap_storage)
+							Z_MallocAlign(256, PU_STATIC, &colormap_storage, 8);
+
+						memcpy(colormap_storage, fadetable, 256);
+						colormap = colormap_storage;
+
+						Z_Free(clm);
+					}
+				}
 
 				if (r_splitscreen == 3)
 				{
@@ -6105,7 +6133,7 @@ void K_drawKartHUD(void)
 					snapflags = 0;
 				}
 
-				V_DrawScaledPatch(x-(SHORT(pat->width)), y-(SHORT(pat->height)), snapflags, pat);
+				V_DrawMappedPatch(x-(SHORT(pat->width)), y-(SHORT(pat->height)), snapflags, pat, colormap);
 			}
 		}
 		else

src/p_setup.cpp

@@ -8532,6 +8532,14 @@ boolean P_LoadLevel(boolean fromnetsave, boolean reloadinggamestate)
 			wipetype = wipe_encore_towhite;
 		}
 
+		if (g_attractnowipe)
+		{
+			// Attract demos do a custom fade on exit, so
+			// don't run a wipe here.
+			g_attractnowipe = false;
+		}
+		else
+		{
 			if (rendermode != render_none)
 			{
 				F_WipeStartScreen();
@@ -8542,6 +8550,7 @@ boolean P_LoadLevel(boolean fromnetsave, boolean reloadinggamestate)
 
 			F_RunWipe(wipetype, wipedefs[wipetype], false, ((levelfadecol == 0) ? "FADEMAP1" : "FADEMAP0"), false, false);
 		}
+	}
 
 	/*
 	if (!titlemapinaction)