Add CA_DASHMODE to the game

This works fine in single player on vanilla builds, multiplayer is untested. This might not be the best way to handle the ability, so modifications for efficiency/sanity might be necessary.

src/d_player.h

@@ -57,7 +57,8 @@ typedef enum
 	CA_FALLSWITCH,
 	CA_JUMPBOOST,
 	CA_AIRDRILL,
-	CA_JUMPTHOK
+	CA_JUMPTHOK,
+	CA_DASHMODE
 } charability_t;
 
 //Secondary skin abilities

src/dehacked.c

@@ -7623,6 +7623,7 @@ struct {
 	{"CA_JUMPBOOST",CA_JUMPBOOST},
 	{"CA_AIRDRILL",CA_AIRDRILL},
 	{"CA_JUMPTHOK",CA_JUMPTHOK},
+	{"CA_DASHMODE",CA_DASHMODE},
 	// Secondary
 	{"CA2_NONE",CA2_NONE}, // now slot 0!
 	{"CA2_SPINDASH",CA2_SPINDASH},

src/p_user.c

@@ -4072,6 +4072,7 @@ static void P_DoJumpStuff(player_t *player, ticcmd_t *cmd)
 				case CA_THOK:
 				case CA_HOMINGTHOK:
 				case CA_JUMPTHOK: // Credit goes to CZ64 and Sryder13 for the original
+				case CA_DASHMODE: // Credit goes to Iceman404
 					// Now it's Sonic's abilities turn!
 					// THOK!
 					if (!(player->pflags & PF_THOKKED) || (player->charability2 == CA2_MULTIABILITY))
@@ -8664,6 +8665,8 @@ void P_DoPityCheck(player_t *player)
 //
 
 boolean playerdeadview; // show match/chaos/tag/capture the flag rankings while in death view
+INT32 dashmode = 0; // initial variable set for CA_DASHMODE
+boolean dashmodeflag = false;
 
 void P_PlayerThink(player_t *player)
 {
@@ -9148,6 +9151,63 @@ void P_PlayerThink(player_t *player)
 
 	player->pflags &= ~PF_SLIDING;
 
+	// Dash mode ability for Metal Sonic
+	if ((player->charability == CA_DASHMODE) && !(maptol & TOL_NIGHTS))		// woo, dashmode! no nights tho.
+	{
+		fixed_t defspeed = skins[player->skin].normalspeed; 	// Default normalspeed.
+		fixed_t maxtop = skins[player->skin].normalspeed * 55/36;
+
+		if (!(player->speed > player->normalspeed))		//are we currently exceeding our normalspeed?
+			player->actionspd = player->normalspeed;	//if not, force thok to normalspeed
+		else
+			player->actionspd = player->speed;		//otherwise, thok at your current speed (this fixes super and speedshoes thok slowing you down)
+
+		if (player->speed >= (defspeed - 5*FRACUNIT) || (player->pflags & PF_STARTDASH))   
+		{
+			dashmode++; 	// Counter. Adds 1 to dash mode per tic in top speed.
+			if (dashmode == 3*TICRATE)		// This isn't in the ">=" equation because it'd cause the sound to play infinitely.
+				S_StartSound(player->mo, sfx_s3ka2); 	// If the player enters dashmode, play this sound on the the tic it starts.		
+		}
+		else if (!(player->pflags & PF_SPINNING))
+		{
+			if (dashmode > 0) 
+				dashmode = dashmode - 3;	// Rather than lose it all, it gently counts back down!
+			else if (dashmode < 0) 
+				dashmode = 0;
+		}
+
+		if (dashmode >= 3*TICRATE && P_IsObjectOnGround(player->mo))  	// Dash Mode can continue counting in the air, but will only activate on floor touch.
+			dashmodeflag = true;												
+	
+		if (dashmode < 3*TICRATE)	// Exits Dash Mode if you drop below speed/dash counter tics. Not in the above block so it doesn't keep disabling in midair.
+		{
+			player->normalspeed = defspeed; 	// Reset to default if not capable of entering dash mode.
+			player->jumpfactor = 1*FRACUNIT;
+			dashmodeflag = false;
+		}
+		
+		//WHEN PARAMETERS ARE MET, REWARD THE DASH MODE EFFECTS
+		if (dashmodeflag) 
+		{
+			if (player->normalspeed < maxtop)   // If the player is not currently at 50 normalspeed in dash mode, add speed each tic
+			{
+				player->normalspeed = player->normalspeed + 1*FRACUNIT/5; 	// Enter Dash Mode smoothly.
+				if (player->jumpfactor < 5*FRACUNIT/4)
+					player->jumpfactor = player->jumpfactor + 1*FRACUNIT/300; 	// Boosts his jumpheight. Remember fractions instead of decimals. "1.5*FRACUNIT = 3*FRACUNIT/2"				
+			}	
+		}
+		
+		//COSMETIC STUPIDITY!
+		if (dashmode > 108)		//Dash Mode will go down a tic a bit above activation, this makes dust spawn every other tic.
+			dashmode = 107;
+			
+		if (player->normalspeed >= maxtop) 
+		{
+			mobj_t *ghost = P_SpawnGhostMobj(player->mo); 	// Spawns afterimages
+			ghost->fuse = 2;	// Makes the images fade quickly
+		}
+	}
+	
 /*
 //	Colormap verification
 	{