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Improved NewChaseDir performance by cutting repeats

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This commit is contained in:
Edward Richardson 2015-01-19 23:57:15 +13:00
parent db25322b4c
commit 455e6cd214
1 changed files with 35 additions and 24 deletions
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59
src/p_enemy.cpp
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@ -670,33 +670,39 @@ bool P_TryWalk (AActor *actor)
void P_DoNewChaseDir (AActor *actor, fixed_t deltax, fixed_t deltay)
{
dirtype_t d[3];
dirtype_t d[2];
int tdir;
dirtype_t olddir, turnaround;
bool attempts[NUMDIRS-1]; // We don't need to attempt DI_NODIR.
memset(&attempts, false, sizeof(attempts));
olddir = (dirtype_t)actor->movedir;
turnaround = opposite[olddir];
if (deltax>10*FRACUNIT)
d[1]= DI_EAST;
d[0]= DI_EAST;
else if (deltax<-10*FRACUNIT)
d[1]= DI_WEST;
d[0]= DI_WEST;
else
d[0]=DI_NODIR;
if (deltay<-10*FRACUNIT)
d[1]= DI_SOUTH;
else if (deltay>10*FRACUNIT)
d[1]= DI_NORTH;
else
d[1]=DI_NODIR;
if (deltay<-10*FRACUNIT)
d[2]= DI_SOUTH;
else if (deltay>10*FRACUNIT)
d[2]= DI_NORTH;
else
d[2]=DI_NODIR;
// try direct route
if (d[1] != DI_NODIR && d[2] != DI_NODIR)
if (d[0] != DI_NODIR && d[1] != DI_NODIR)
{
actor->movedir = diags[((deltay<0)<<1) + (deltax>0)];
if (actor->movedir != turnaround && P_TryWalk(actor))
return;
if (actor->movedir != turnaround)
{
attempts[actor->movedir] = true;
if (P_TryWalk(actor))
return;
}
}
// try other directions
@ -704,18 +710,19 @@ void P_DoNewChaseDir (AActor *actor, fixed_t deltax, fixed_t deltay)
{
if ((pr_newchasedir() > 200 || abs(deltay) > abs(deltax)))
{
swapvalues (d[1], d[2]);
swapvalues (d[0], d[1]);
}
if (d[0] == turnaround)
d[0] = DI_NODIR;
if (d[1] == turnaround)
d[1] = DI_NODIR;
if (d[2] == turnaround)
d[2] = DI_NODIR;
}
if (d[1] != DI_NODIR)
if (d[0] != DI_NODIR && attempts[d[0]] == false)
{
actor->movedir = d[1];
actor->movedir = d[0];
attempts[d[0]] = true;
if (P_TryWalk (actor))
{
// either moved forward or attacked
@ -723,9 +730,10 @@ void P_DoNewChaseDir (AActor *actor, fixed_t deltax, fixed_t deltay)
}
}
if (d[2] != DI_NODIR)
if (d[1] != DI_NODIR && attempts[d[1]] == false)
{
actor->movedir = d[2];
actor->movedir = d[1];
attempts[d[1]] = true;
if (P_TryWalk (actor))
return;
}
@ -733,9 +741,10 @@ void P_DoNewChaseDir (AActor *actor, fixed_t deltax, fixed_t deltay)
if (!(actor->flags5 & MF5_AVOIDINGDROPOFF))
{
// there is no direct path to the player, so pick another direction.
if (olddir != DI_NODIR)
if (olddir != DI_NODIR && attempts[olddir] == false)
{
actor->movedir = olddir;
attempts[olddir] = true;
if (P_TryWalk (actor))
return;
}
@ -746,9 +755,10 @@ void P_DoNewChaseDir (AActor *actor, fixed_t deltax, fixed_t deltay)
{
for (tdir = DI_EAST; tdir <= DI_SOUTHEAST; tdir++)
{
if (tdir != turnaround)
if (tdir != turnaround && attempts[tdir] == false)
{
actor->movedir = tdir;
attempts[tdir] = true;
if ( P_TryWalk(actor) )
return;
}
@ -758,16 +768,17 @@ void P_DoNewChaseDir (AActor *actor, fixed_t deltax, fixed_t deltay)
{
for (tdir = DI_SOUTHEAST; tdir != (DI_EAST-1); tdir--)
{
if (tdir != turnaround)
if (tdir != turnaround && attempts[tdir] == false)
{
actor->movedir = tdir;
attempts[tdir] = true;
if ( P_TryWalk(actor) )
return;
}
}
}
if (turnaround != DI_NODIR)
if (turnaround != DI_NODIR && attempts[turnaround] == false)
{
actor->movedir =turnaround;
if ( P_TryWalk(actor) )