Add the ability to play SECRET_ALTMUSIC music on the Challenges screen

Supports both standard play and "E Side", if it exists (justification for Encore using the same CD)

src/k_menudraw.c

@@ -7089,6 +7089,90 @@ static void M_DrawChallengePreview(INT32 x, INT32 y)
 
 			break;
 		}
+		case SECRET_ALTMUSIC:
+		{
+			UINT16 map = M_UnlockableMapNum(ref);
+			if (map >= nummapheaders
+				|| !mapheaderinfo[map])
+			{
+				return;
+			}
+
+			UINT8 musicid;
+			for (musicid = 1; musicid < MAXMUSNAMES; musicid++)
+			{
+				if (mapheaderinfo[map]->cache_muslock[musicid - 1] == challengesmenu.currentunlock)
+					break;
+			}
+
+			if (musicid == MAXMUSNAMES)
+			{
+				return;
+			}
+
+			spritedef_t *sprdef = &sprites[SPR_ALTM];
+			spriteframe_t *sprframe;
+			patch_t *patch;
+			UINT32 addflags = 0;
+
+			x -= 10;
+			y += 15;
+
+			if (sprdef->numframes)
+			{
+				sprframe = &sprdef->spriteframes[0];
+				patch = W_CachePatchNum(sprframe->lumppat[0], PU_CACHE);
+
+				if (sprframe->flip & 1) // Only for first sprite
+				{
+					addflags ^= V_FLIP; // This sprite is left/right flipped!
+				}
+
+				V_DrawFixedPatch(x*FRACUNIT, (y+2)*FRACUNIT, FRACUNIT/2, addflags, patch, NULL);
+			}
+
+			x = 8;
+			y = BASEVIDHEIGHT-16;
+
+			const boolean thismusplaying = Music_Playing("challenge_altmusic");
+			boolean pushed = false;
+			const char *song = NULL;
+
+			if (M_SecretUnlocked(SECRET_ENCORE, true)
+				&& musicid < mapheaderinfo[map]->encoremusname_size)
+			{
+				if (thismusplaying)
+				{
+					song = Music_Song("challenge_altmusic");
+					pushed = strcmp(song, mapheaderinfo[map]->encoremusname[musicid]) == 0;
+				}
+
+				K_drawButton(x&FRACUNIT, y*FRACUNIT, 0, kp_button_l, pushed);
+				x += SHORT(kp_button_l[0]->width);
+				V_DrawThinString(x, y + 1, (pushed ? V_GRAYMAP : highlightflags), "E Side");
+
+				x = 8;
+				y -= 10;
+			}
+
+			if (musicid < mapheaderinfo[map]->musname_size)
+			{
+				if (pushed || !thismusplaying)
+				{
+					pushed = false;
+				}
+				else
+				{
+					if (!song)
+						song = Music_Song("challenge_altmusic");
+					pushed = strcmp(song, mapheaderinfo[map]->musname[musicid]) == 0;
+				}
+
+				K_drawButton(x*FRACUNIT, y*FRACUNIT, 0, kp_button_a[1], pushed);
+				x += SHORT(kp_button_a[1][0]->width);
+				V_DrawThinString(x, y + 1, (pushed ? V_GRAYMAP : highlightflags), "Play CD");
+			}
+		}
 		default:
 		{
 			break;

src/menus/extras-challenges.c

@@ -834,6 +834,8 @@ boolean M_ChallengesInputs(INT32 ch)
 	{
 		if (M_MenuBackPressed(pid) || start)
 		{
+			Music_Stop("challenge_altmusic");
+
 			currentMenu->prevMenu = M_SpecificMenuRestore(currentMenu->prevMenu);
 
 			M_GoBack(0);
@@ -1021,17 +1023,83 @@ boolean M_ChallengesInputs(INT32 ch)
 			return true;
 		}
 
-		if (M_MenuConfirmPressed(pid)
-			&& challengesmenu.currentunlock < MAXUNLOCKABLES
+		if (challengesmenu.currentunlock < MAXUNLOCKABLES
 			&& gamedata->unlocked[challengesmenu.currentunlock])
 		{
 			switch (unlockables[challengesmenu.currentunlock].type)
 			{
-				case SECRET_ALTTITLE: {
-					extern consvar_t cv_alttitle;
-					CV_AddValue(&cv_alttitle, 1);
-					S_StartSound(NULL, sfx_s3kc3s);
-					M_SetMenuDelay(pid);
+				case SECRET_ALTTITLE:
+				{
+					if (M_MenuConfirmPressed(pid))
+					{
+						extern consvar_t cv_alttitle;
+						CV_AddValue(&cv_alttitle, 1);
+						S_StartSound(NULL, sfx_s3kc3s);
+						M_SetMenuDelay(pid);
+					}
+					break;
+				}
+				case SECRET_ALTMUSIC:
+				{
+					UINT8 trymus = 0, musicid = MAXMUSNAMES;
+
+					if (M_MenuConfirmPressed(pid))
+					{
+						trymus = 1;
+					}
+					else if (M_MenuButtonPressed(pid, MBT_L))
+					{
+						trymus = 2;
+					}
+
+					if (trymus)
+					{
+						const char *trymusname = NULL;
+
+						UINT16 map = M_UnlockableMapNum(&unlockables[challengesmenu.currentunlock]);
+						if (map >= nummapheaders
+							|| !mapheaderinfo[map])
+						{
+							;
+						}
+						else for (musicid = 1; musicid < MAXMUSNAMES; musicid++)
+						{
+							if (mapheaderinfo[map]->cache_muslock[musicid - 1] == challengesmenu.currentunlock)
+								break;
+						}
+
+						if (trymus == 1)
+						{
+							if (musicid < mapheaderinfo[map]->musname_size)
+							{
+								trymusname = mapheaderinfo[map]->musname[musicid];
+							}
+						}
+						else
+						{
+							if (musicid < mapheaderinfo[map]->encoremusname_size)
+							{
+								trymusname = mapheaderinfo[map]->encoremusname[musicid];
+							}
+						}
+
+						if (trymusname)
+						{
+							if (!Music_Playing("challenge_altmusic")
+								|| strcmp(Music_Song("challenge_altmusic"), trymusname))
+							{
+								Music_Remap("challenge_altmusic", trymusname);
+								Music_Play("challenge_altmusic");
+							}
+							else
+							{
+								Music_Stop("challenge_altmusic");
+							}
+
+							M_SetMenuDelay(pid);
+						}
+					}
+
 					break;
 				}
 				default:

src/music.cpp

@@ -195,6 +195,14 @@ void Music_Init(void)
 		tune.fade_out = 5000;
 		tune.fade_out_inclusive = false;
 	}
+
+	{
+		Tune& tune = g_tunes.insert("challenge_altmusic");
+
+		tune.priority = 100;
+		tune.resist = true;
+		tune.credit = true;
+	}
 }
 
 void Music_Tick(void)