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- fixed some serious efficiency problems with clipping masked geometry against portals.

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The function to do the work scanned the full list of drawsegs to find portals, which with a large amount of masked geometry and/or drawsegs could become extremely slow.
Changed it so that R_DrawMasked collects all portal related drawsegs up front so that the actual clipping code can
 a) scan a far shorter list and
 b) can skip half of the validation.

Also using P_PointOnLinePrecise to shave off a small bit of additional time.
This commit is contained in:
Christoph Oelckers 2016-02-29 12:39:03 +01:00
parent 0cf9cae7f3
commit 2321c9973f
1 changed files with 33 additions and 10 deletions
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43
src/r_things.cpp
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@ -324,18 +324,19 @@ nextpost:
// [ZZ]
// R_ClipSpriteColumnWithPortals
//
static inline bool R_ClipSpriteColumnWithPortals (fixed_t x, fixed_t y, vissprite_t* spr)
{
// [ZZ] 10.01.2016: don't clip sprites from the root of a skybox.
if (CurrentPortalInSkybox)
return false;
static TArray<drawseg_t *> portaldrawsegs;
static inline void R_CollectPortals()
{
// This function collects all drawsegs that may be of interest to R_ClipSpriteColumnWithPortals
// Having that function over the entire list of drawsegs can break down performance quite drastically.
// This is doing the costly stuff only once so that R_ClipSpriteColumnWithPortals can
// a) exit early if no relevant info is found and
// b) skip most of the collected drawsegs which have no portal attached.
portaldrawsegs.Clear();
for (drawseg_t* seg = ds_p; seg-- > firstdrawseg; ) // copied code from killough below
{
// ignore segs from other portals
if (seg->CurrentPortalUniq != CurrentPortalUniq)
continue;
// I don't know what makes this happen (some old top-down portal code or possibly skybox code? something adds null lines...)
// crashes at the first frame of the first map of Action2.wad
if (!seg->curline) continue;
@ -352,8 +353,28 @@ static inline bool R_ClipSpriteColumnWithPortals (fixed_t x, fixed_t y, vissprit
if (seg->curline->sidedef != line->sidedef[0])
continue;
portaldrawsegs.Push(seg);
}
}
static inline bool R_ClipSpriteColumnWithPortals(fixed_t x, fixed_t y, vissprite_t* spr)
{
// [ZZ] 10.01.2016: don't clip sprites from the root of a skybox.
if (CurrentPortalInSkybox)
return false;
for(drawseg_t *seg : portaldrawsegs)
{
// ignore segs from other portals
if (seg->CurrentPortalUniq != CurrentPortalUniq)
continue;
// (all checks that are already done in R_CollectPortals have been removed for performance reasons.)
line_t* line = seg->curline->linedef;
// don't clip if the sprite is in front of the portal
if (!P_PointOnLineSide(x, y, line))
if (!P_PointOnLineSidePrecise(x, y, line))
continue;
// now if current column is covered by this drawseg, we clip it away
@ -364,6 +385,7 @@ static inline bool R_ClipSpriteColumnWithPortals (fixed_t x, fixed_t y, vissprit
return false;
}
//
// R_DrawVisSprite
// mfloorclip and mceilingclip should also be set.
@ -2332,6 +2354,7 @@ void R_DrawHeightPlanes(fixed_t height); // kg3D - fake planes
void R_DrawMasked (void)
{
R_CollectPortals();
R_SortVisSprites (DrewAVoxel ? sv_compare2d : sv_compare, firstvissprite - vissprites);
if (height_top == NULL)