diff options
Diffstat (limited to 'clip.c')
| -rw-r--r-- | clip.c | 21 |
1 files changed, 11 insertions, 10 deletions
@@ -75,7 +75,7 @@ eqpt3(Point3 a, Point3 b) * - https://github.com/aap/librw/blob/14dab85dcae6f3762fb2b1eda4d58d8e67541330/tools/playground/tl_tests.cpp#L522 */ int -clipprimitive(Primitive *p) +clipprimitive(Primitive *p, Primitive *cp) { /* signed distance from each clipping plane */ static double sdm[6][4] = { @@ -97,8 +97,8 @@ clipprimitive(Primitive *p) Vout = &Voutp; memset(Vin, 0, sizeof Vinp); memset(Vout, 0, sizeof Voutp); - for(i = 0; i < p[0].type+1; i++) - addvert(Vin, p[0].v[i]); + for(i = 0; i < p->type+1; i++) + addvert(Vin, p->v[i]); for(j = 0; j < 6 && Vin->n > 0; j++){ for(i = 0; i < Vin->n; i++){ @@ -133,10 +133,11 @@ allin: if(Vout->n < 2) cleanpoly(Vout); - else switch(p[0].type){ + else switch(p->type){ case PLine: - p[0].v[0] = dupvertex(&Vout->v[0]); - p[0].v[1] = eqpt3(Vout->v[0].p, Vout->v[1].p)? dupvertex(&Vout->v[2]): dupvertex(&Vout->v[1]); + cp[0] = *p; + cp[0].v[0] = dupvertex(&Vout->v[0]); + cp[0].v[1] = eqpt3(Vout->v[0].p, Vout->v[1].p)? dupvertex(&Vout->v[2]): dupvertex(&Vout->v[1]); cleanpoly(Vout); np = 1; break; @@ -148,10 +149,10 @@ allin: * are referenced on every triangle, so duplicate them * to avoid complications during rasterization. */ - p[np] = p[0]; - p[np].v[0] = i < Vout->n-2-1? dupvertex(&Vout->v[0]): Vout->v[0]; - p[np].v[1] = Vout->v[i+1]; - p[np].v[2] = i < Vout->n-2-1? dupvertex(&Vout->v[i+2]): Vout->v[i+2]; + cp[np] = *p; + cp[np].v[0] = i < Vout->n-2-1? dupvertex(&Vout->v[0]): Vout->v[0]; + cp[np].v[1] = Vout->v[i+1]; + cp[np].v[2] = i < Vout->n-2-1? dupvertex(&Vout->v[i+2]): Vout->v[i+2]; } break; } |