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me-main #1

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Nate Rupsis merged 123 commits from me-main into main 2023-02-13 18:39:11 +01:00
Conversation 0 Commits 123 Files Changed 969 +35 -13
1 changed files with 35 additions and 13 deletions
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source/blender/blenlib/intern/polyfill_2d.c
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@ -155,7 +155,7 @@ static PolyIndex *pf_ear_tip_find(PolyFill *pf
#endif
);
static bool pf_ear_tip_check(PolyFill *pf, PolyIndex *pi_ear_tip);
static bool pf_ear_tip_check(PolyFill *pf, PolyIndex *pi_ear_tip, const eSign sign_accept);
static void pf_ear_tip_cut(PolyFill *pf, PolyIndex *pi_ear_tip);
BLI_INLINE eSign signum_enum(float a)
@ -590,15 +590,36 @@ static PolyIndex *pf_ear_tip_find(PolyFill *pf
uint i;
/* Use two passes when looking for an ear.
*
* - The first pass only picks *good* (concave) choices.
* For polygons which aren't degenerate this works well
* since it avoids creating any zero area faces.
*
* - The second pass is only met if no concave choices are possible,
* so the cost of a second pass is only incurred for degenerate polygons.
* In this case accept zero area faces as better alternatives aren't available.
*
* See: #103913 for reference.
*
* NOTE: these passes draw a distinction between zero area faces and concave
* which is susceptible minor differences in float precision
* (since #TANGENTIAL compares with 0.0f).
*
* While it's possible to compute an error threshold and run a pass that picks
* ears which are more likely not to appear as zero area from a users perspective,
* this API prioritizes performance (for real-time updates).
* Higher quality tessellation can always be achieved using #BLI_polyfill_beautify.
*/
for (eSign sign_accept = CONVEX; sign_accept >= TANGENTIAL; sign_accept--) {
#ifdef USE_CLIP_EVEN
pi_ear = pi_ear_init;
#else
pi_ear = pf->indices;
#endif
i = coords_num;
while (i--) {
if (pf_ear_tip_check(pf, pi_ear)) {
if (pf_ear_tip_check(pf, pi_ear, sign_accept)) {
return pi_ear;
}
#ifdef USE_CLIP_SWEEP
@ -607,6 +628,7 @@ static PolyIndex *pf_ear_tip_find(PolyFill *pf
pi_ear = pi_ear->next;
#endif
}
}
/* Desperate mode: if no vertex is an ear tip,
* we are dealing with a degenerate polygon (e.g. nearly collinear).
@ -638,7 +660,7 @@ static PolyIndex *pf_ear_tip_find(PolyFill *pf
return pi_ear;
}
static bool pf_ear_tip_check(PolyFill *pf, PolyIndex *pi_ear_tip)
static bool pf_ear_tip_check(PolyFill *pf, PolyIndex *pi_ear_tip, const eSign sign_accept)
{
#ifndef USE_KDTREE
/* localize */
@ -674,7 +696,7 @@ static bool pf_ear_tip_check(PolyFill *pf, PolyIndex *pi_ear_tip)
}
#endif
if (UNLIKELY(pi_ear_tip->sign == CONCAVE)) {
if (UNLIKELY(pi_ear_tip->sign != sign_accept)) {
return false;
}