--enable-boxclip configure option and some more tweaks, I guess (been too long)
This commit is contained in:
Bill Currie
Jeff Teunissen
parent
5df7fe5512
commit
51932ee433
11
configure.ac
11
configure.ac
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@ -1739,6 +1739,17 @@ fi
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AC_SUBST(Z_LIBS)
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AM_CONDITIONAL(HAVE_ZLIB, test "$HAVE_ZLIB" = "yes")
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AC_ARG_ENABLE(boxclip,
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[ --enable-boxclip enable box clipping],
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boxclip=$enable_boxclip,
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boxclip=no
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)
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if test "x$boxclip" != xno; then
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AC_DEFINE(ENABLE_BOXCLIP, 1, [Define if you want boxclipping])
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else
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AC_DEFINE(ENABLE_BOXCLIP, 0, [Define if you want boxclipping])
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fi
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dnl ==================================================================
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dnl Find out what to build
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dnl ==================================================================
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@ -5,9 +5,28 @@
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#undef DIST_EPSILON
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#define DIST_EPSILON 0
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#define ENABLE_BOXCLIP
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#define TEST_BOXCLIP
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#include "trace.c"
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dclipnode_t clipnodes0[] = {
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{ 0, { 1, -1}},
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{ 1, {-1, -2}},
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};
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mplane_t planes0[] = {
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{{1, 0, 0}, 0, 0, 0}, // 0
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{{0.8, 0, 0.6}, 0, 4, 0}, // 1
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};
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hull_t hull0 = {
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clipnodes0,
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planes0,
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0,
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1,
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{0, 0, 0},
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{0, 0, 0},
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};
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dclipnode_t clipnodes1[] = {
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{ 0, { 1, -2}},
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{ 1, {-2, 2}},
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@ -149,7 +168,7 @@ hull_t hull3 = {
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clipnodes3,
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planes3,
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0,
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6,
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16,
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{0, 0, 0},
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{0, 0, 0},
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};
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@ -229,6 +248,12 @@ typedef struct {
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} test_t;
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test_t tests[] = {
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{0, &hull0, {-20, 0, 28}, {20, 0, 28}, {1, 0, 0, 1, 0}},
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{0, &hull0, {-20, 0, 27}, {20, 0, 27}, {0.1, 0, 0, 1, 0}},
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{0, &hull0, {-20, 0, -76}, {20, 0, -76}, {0.1, 0, 0, 1, 0}},
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{0, &hull0, {-20, 0, -77}, {20, 0, -77}, {0.1, 0, 0, 1, 0}},
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{"drop on trench edge",
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&hull1, {0, 47, 40}, {0, 47, 32}, {0.5, 0, 0, 1, 0}},
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{"drop past trench edge",
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@ -279,6 +304,8 @@ test_t tests[] = {
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{"drop onto thin bridge",
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&hull4, {544, 1080, 5}, {544, 1080, 3}, {0.5, 0, 0, 1, 0}},
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{"long drop onto thin bridge",
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&hull4, {544, 1080, 78}, {544, 1080, -70}, {0.5, 0, 0, 1, 0}},
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};
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const int num_tests = sizeof (tests) / sizeof (tests[0]);
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@ -83,12 +83,26 @@ calc_impact (trace_t *trace, const vec3_t start, const vec3_t end,
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VectorSubtract (end, start, dist);
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VectorMultAdd (start, frac, dist, trace->endpos);
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}
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#ifdef ENABLE_BOXCLIP
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#if ENABLE_BOXCLIP || defined(TEST_BOXCLIP)
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#define ALLSOLID 1
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#define STARTSOLID 2
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#define INOPEN 4
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#define INWATER 8
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#define SOLID (ALLSOLID | STARTSOLID)
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typedef struct {
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mplane_t *plane;
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vec3_t point; // arbitrary point on plane
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int side;
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} tp_t;
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typedef struct {
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vec3_t p;
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vec3_t v;
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} line_t;
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typedef struct {
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const vec_t *start;
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const vec_t *end;
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@ -96,40 +110,23 @@ typedef struct {
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qboolean isbox;
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hull_t hull;
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tp_t split;
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tp_t straddle;
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tp_t impact;
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float fraction;
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int flags;
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} tl_t;
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static inline void
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set_split (tl_t *tl, mplane_t *plane, int side, tp_t *s)
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set_split (tl_t *tl, tp_t *n, tp_t *o)
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{
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if (s)
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*s = tl->split;
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tl->split.plane = plane;
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tl->split.side = side;
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}
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static inline void
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restore_split (tl_t *tl, tp_t *s)
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{
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tl->split = *s;
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}
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static inline void
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set_straddle (tl_t *tl, mplane_t *plane, int side, tp_t *s)
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{
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if (s)
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*s = tl->straddle;
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tl->straddle.plane = plane;
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tl->straddle.side = side;
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}
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static inline void
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restore_straddle (tl_t *tl, tp_t *s)
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{
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tl->straddle = *s;
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if (o)
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*o = tl->split;
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if (n) {
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tl->split = *n;
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} else {
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tl->split.plane = 0;
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VectorZero (tl->split.point);
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tl->split.side = 0;
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}
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}
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static inline void
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@ -150,39 +147,6 @@ sgn (vec_t v)
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return v < 0 ? -1 : (v > 0 ? 1 : 0);
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}
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static inline void
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select_point (tl_t *tl, tp_t *impact, tp_t *split, vec3_t offs)
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{
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int axis;
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for (axis = 0; axis < 3; axis++) {
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vec_t s = sgn (impact->plane->normal[axis]);
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if (!impact->side)
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s = -s;
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if (!s) {
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s = sgn (split->plane->normal[axis]);
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if (split->side)
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s = -s;
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}
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offs[axis] = tl->extents[axis] * s;
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}
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}
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static inline void
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check_contents (int num, tl_t *tl)
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{
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if (num != CONTENTS_SOLID) {
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tl->flags &= ~1;
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if (num == CONTENTS_EMPTY)
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tl->flags |= 4;
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else
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tl->flags |= 8;
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} else {
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if (!(tl->flags & 12))
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tl->flags |= 2;
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}
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}
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static inline float
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calc_offset (tl_t *tl, mplane_t *plane)
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{
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@ -197,15 +161,16 @@ calc_offset (tl_t *tl, mplane_t *plane)
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return 0;
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}
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static void
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impact (tl_t *tl)
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impact (tl_t *tl, tp_t *split)
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{
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float t1, t2, offset, frac;
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int side = 0;
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t1 = PlaneDiff (tl->start, tl->split.plane);
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t2 = PlaneDiff (tl->end, tl->split.plane);
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offset = calc_offset (tl, tl->split.plane);
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t1 = PlaneDiff (tl->start, split->plane);
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t2 = PlaneDiff (tl->end, split->plane);
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offset = calc_offset (tl, split->plane);
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if (t1 < t2) {
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side = -1;
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frac = (t1 + offset) / (t1 - t2);
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@ -218,140 +183,73 @@ impact (tl_t *tl)
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}
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if (frac >= 0) {
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tl->fraction = frac;
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set_impact (tl, tl->split.plane, side);
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set_impact (tl, split->plane, side);
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// print_tp (tl->impact);
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}
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}
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static int
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validate_impact (tp_t *split, tl_t *tl)
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static void
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select_vertex (tl_t *tl, tp_t *split, vec3_t vert)
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{
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vec3_t dist, point, offs;
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int side;
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int axis;
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VectorSubtract (tl->end, tl->start, dist);
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VectorMultAdd (tl->start, tl->fraction, dist, point);
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select_point (tl, &tl->impact, split, offs);
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VectorAdd (point, offs, point);
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side = PlaneDiff (point, split->plane) < 0;
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#if 0
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Sys_Printf ("\nimpact: (%g %g %g) (%g %g %g) %d %d\n",
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point[0], point[1], point[2],
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offs[0], offs[1], offs[2],
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side, split->side);
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print_tp (tl->impact);
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print_tp (*split);
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#endif
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if (side != split->side) {
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tl->fraction = 1;
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set_impact (tl, 0, 0);
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return 0;
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for (axis = 0; axis < 3; axis++) {
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vec_t s = sgn (tl->split.plane->normal[axis]);
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if (!tl->split.side)
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s = -s;
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if (!s) {
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s = sgn (split->plane->normal[axis]);
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if (split->side)
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s = -s;
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if (!s)
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s = 1;
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}
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vert[axis] = tl->extents[axis] * s;
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}
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}
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static int
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intersection_point (const mplane_t *plane, const vec3_t _p1, const vec3_t _p2,
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const vec3_t offs, vec3_t point)
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{
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vec_t t1, t2;
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vec3_t p1, p2;
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VectorAdd (_p1, offs, p1);
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VectorAdd (_p2, offs, p2);
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t1 = PlaneDiff (p1, plane);
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t2 = PlaneDiff (p2, plane);
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if (!(t1 - t2))
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return 0;
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VectorSubtract (p2, p1, point);
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VectorMultAdd (p1, t1 / (t1 - t2), point, point);
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return 1;
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}
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#define set_point(a,s,b,c) \
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do { \
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(c)[0] = (a)[0] + (s)[0] * (b)[0]; \
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(c)[1] = (a)[1] + (s)[1] * (b)[1]; \
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(c)[2] = (a)[2] + (s)[2] * (b)[2]; \
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} while (0)
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static int
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validate_solid (const vec3_t p, tp_t *wall, tp_t *straddle, tl_t *tl)
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intersection_line (tl_t *tl, tp_t *split, const vec3_t p1, const vec3_t p2,
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line_t *line)
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{
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static const vec3_t edges[][2] = {
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{{ 1, -1, 1}, { 1, 1, 1}},
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{{-1, -1, 1}, { 1, -1, 1}},
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{{-1, -1, 1}, {-1, 1, 1}},
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{{-1, 1, 1}, { 1, 1, 1}},
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const vec_t *pn1 = tl->split.plane->normal;
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const vec_t *pp1 = tl->split.point;
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const vec_t *pn2 = split->plane->normal;
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const vec_t *pp2 = split->point;
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vec3_t pvec;
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vec_t t;
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{{ 1, 1, -1}, { 1, 1, 1}},
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{{ 1, -1, -1}, { 1, -1, 1}},
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{{-1, -1, -1}, {-1, -1, 1}},
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{{-1, 1, -1}, {-1, 1, 1}},
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{{ 1, -1, -1}, { 1, 1, -1}},
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{{-1, -1, -1}, { 1, -1, -1}},
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{{-1, -1, -1}, {-1, 1, -1}},
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{{-1, 1, -1}, { 1, 1, -1}},
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};
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static const int tests[] = {
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0xa0a, 0x505, 0x0f0, 0x5f5, 0xafa, 0xf0f, 0xfff,
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};
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float t, t1, t2, frac;
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int side;
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vec3_t p1, p2, dist, point;
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int type = wall->plane->type;
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int i;
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if (!straddle->plane)
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return 1;
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for (i = 0; i < 4; i++) {
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set_point (p, edges[i + 4][0], tl->extents, p1);
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t1 = PlaneDiff (p1, wall->plane);
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if ((t1 < 0) == wall->side) {
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t = PlaneDiff (p1, straddle->plane);
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if ((t < 0) == straddle->side)
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return 1;
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}
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set_point (p, edges[i + 4][1], tl->extents, p2);
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t2 = PlaneDiff (p2, wall->plane);
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if ((t2 < 0) == wall->side) {
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t = PlaneDiff (p2, straddle->plane);
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if ((t < 0) == straddle->side)
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return 1;
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}
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}
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if (type >= 3) {
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// don't trust multi-axial types
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if (!wall->plane->normal[0])
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type = 3;
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else if (!wall->plane->normal[1])
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type = 4;
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else if (!wall->plane->normal[1])
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type = 5;
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else
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type = 6;
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}
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for (i = 0; i < 12; i++) {
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if (!(tests[type] & (1 << i)))
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continue;
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set_point (p, edges[i][0], tl->extents, p1);
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set_point (p, edges[i][1], tl->extents, p2);
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t1 = PlaneDiff (p1, wall->plane);
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t2 = PlaneDiff (p2, wall->plane);
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if (t1 == t2) // shouldn't happen because of the test bits, but...
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continue; // the edge is parallel to the plane
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frac = t1 / (t1 - t2);
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if (frac < 0 || frac > 1)
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continue; // the edge didn't hit the plane
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VectorSubtract (p2, p1, dist);
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VectorMultAdd (p1, frac, dist, point);
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t = PlaneDiff (point, straddle->plane);
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side = t < 0;
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if (!t || side == straddle->side)
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return 1;
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}
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#if 0
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Sys_Printf ("\nsolid: (%g %g %g) (%g %g %g) %d %d\n",
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point[0], point[1], point[2],
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offs[0], offs[1], offs[2],
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side, straddle->side);
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print_tp (*wall);
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print_tp (*straddle);
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#endif
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return 0;
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// find the line of intersection of the two planes, both direction
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// and a point on the line.
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CrossProduct (pn1, pn2, line->v);
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if (VectorIsZero (line->v))
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//planes are parallel, no intersection
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return 0;
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CrossProduct (pn1, line->v, pvec);
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VectorSubtract (pp2, pp1, line->p);
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t = DotProduct (line->p, pn2) / DotProduct (pvec, pn2);
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VectorMultAdd (pp1, t, line->p, line->p);
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return 1;
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}
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static int
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@ -361,13 +259,17 @@ traceline (int num, float p1f, float p2f, const vec3_t p1, const vec3_t p2,
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dclipnode_t *node;
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mplane_t *plane;
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float t1, t2, frac, frac2, midf, offset;
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int side;
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int side, cross;
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vec3_t mid;
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int c1, c2;
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tp_t split;
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// Skip past nodes that don't intersect with the line.
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tp_t split, save;
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line_t line;
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vec3_t dist, vert, vert2, point;
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int check_intersection;
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do {
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// Skip past non-intersecting nodes
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// Sys_Printf ("%d\n", num);
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while (num >= 0) {
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node = tl->hull.clipnodes + num;
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@ -378,97 +280,121 @@ traceline (int num, float p1f, float p2f, const vec3_t p1, const vec3_t p2,
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offset = calc_offset (tl, plane);
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if (t1 >= offset && t2 >= offset) {
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num = node->children[0];
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num = node->children[side = 0];
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} else if (t1 < -offset && t2 < -offset) {
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num = node->children[1];
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num = node->children[side = 1];
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} else {
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break;
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}
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// Sys_Printf ("%d\n", num);
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}
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if (num < 0)
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if (num < 0) {
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return num;
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} while (0);
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// if (t1 == t2) {
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if (t1 >= -offset && t1 < offset && t2 >= -offset && t2 < offset) {
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tp_t straddle;
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set_straddle (tl, plane, 0, &straddle);
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c1 = c2 = traceline (node->children[0], p1f, p2f, p1, p2, tl);
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if (c1 == CONTENTS_SOLID) {
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if (!validate_solid (p1, &tl->straddle, &straddle, tl))
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c1 = CONTENTS_EMPTY;
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} else {
|
||||
if (tl->impact.plane)
|
||||
validate_impact (&tl->straddle, tl);
|
||||
}
|
||||
if (c1 != CONTENTS_SOLID) {
|
||||
set_straddle (tl, plane, 1, 0);
|
||||
c2 = traceline (node->children[1], p1f, p2f, p1, p2, tl);
|
||||
if (c2 == CONTENTS_SOLID && !validate_solid (p1, &tl->straddle,
|
||||
&straddle, tl))
|
||||
c2 = CONTENTS_EMPTY;
|
||||
}
|
||||
restore_straddle (tl, &straddle);
|
||||
if (c1 == CONTENTS_SOLID || c2 == CONTENTS_SOLID) {
|
||||
if (!p1f) {
|
||||
tl->flags &= 3;
|
||||
tl->flags |= 2;
|
||||
|
||||
split.plane = plane;
|
||||
split.side = t1 < t2;
|
||||
VectorSubtract (p2, p1, dist);
|
||||
VectorMultAdd (p1, t1 / (t1 - t2), dist, split.point);
|
||||
if (tl->split.plane) {
|
||||
select_vertex (tl, &split, vert);
|
||||
if ((t1 >= -offset && t1 < offset)
|
||||
&& (t2 < -offset || t2 >= offset)) {
|
||||
// p1 straddles the plane, p2 is clear of the plane
|
||||
intersection_point (tl->split.plane, p1, p2, vert, point);
|
||||
if ((PlaneDiff (point, plane) < 0) != (t1 < t2)) {
|
||||
// the trace misses the intersection of the two planes, so
|
||||
// both ends of the trace are really on the same side of
|
||||
// the plane
|
||||
num = node->children[!(t1 < t2)];
|
||||
continue;
|
||||
}
|
||||
}
|
||||
// if (tl->split.plane)
|
||||
// impact (tl);
|
||||
return CONTENTS_SOLID;
|
||||
}
|
||||
if (c1 == CONTENTS_EMPTY && c2 == CONTENTS_EMPTY) {
|
||||
tl->flags &= ~1;
|
||||
tl->flags |= 4;
|
||||
} else {
|
||||
tl->flags &= ~1;
|
||||
tl->flags |= 8;
|
||||
}
|
||||
return min (c1, c2); //FIXME correct?
|
||||
} else {
|
||||
if (t1 < t2) {
|
||||
side = 1;
|
||||
frac = (t1 - offset) / (t1 - t2);
|
||||
frac2 = (t1 + offset) / (t1 - t2);
|
||||
} else /*if (t1 > t2)*/ {
|
||||
side = 0;
|
||||
frac = (t1 + offset) / (t1 - t2);
|
||||
frac2 = (t1 - offset) / (t1 - t2);
|
||||
}
|
||||
break;
|
||||
} while (1);
|
||||
|
||||
check_intersection = 0;
|
||||
if (tl->split.plane) {
|
||||
VectorNegate (vert, vert2);
|
||||
intersection_point (tl->split.plane, p1, p2, vert2, point);
|
||||
if ((PlaneDiff (point, plane) < 0) != (t1 < t2)) {
|
||||
// the two edges of the hypercube of motion are on opposite sides
|
||||
// of the line of intersection of the two planes, so the box hits
|
||||
// the intersection somewhere
|
||||
check_intersection = 1;
|
||||
}
|
||||
}
|
||||
cross = !(t1 >= -offset && t1 < offset && t2 >= -offset && t2 < offset);
|
||||
|
||||
if (t1 < t2) {
|
||||
side = 1;
|
||||
frac = (t1 - offset) / (t1 - t2);
|
||||
frac2 = (t1 + offset) / (t1 - t2);
|
||||
} else {
|
||||
side = 0;
|
||||
frac = (t1 + offset) / (t1 - t2);
|
||||
frac2 = (t1 - offset) / (t1 - t2);
|
||||
}
|
||||
|
||||
if (check_intersection) {
|
||||
intersection_line (tl, &split, p1, p2, &line);
|
||||
}
|
||||
|
||||
set_split (tl, &split, &save);
|
||||
if (cross) {
|
||||
frac = bound (0, frac, 1);
|
||||
midf = p1f + (p2f - p1f) * frac;
|
||||
VectorSubtract (p2, p1, mid);
|
||||
VectorMultAdd (p1, frac, mid, mid);
|
||||
VectorMultAdd (p1, frac, dist, mid);
|
||||
c1 = c2 = traceline (node->children[side], p1f, midf, p1, mid, tl);
|
||||
|
||||
frac2 = bound (0, frac2, 1);
|
||||
midf = p1f + (p2f - p1f) * frac2;
|
||||
set_split (tl, plane, side ^ 1, &split);
|
||||
if (!tl->impact.plane || midf <= tl->fraction) {
|
||||
VectorSubtract (p2, p1, mid);
|
||||
VectorMultAdd (p1, frac2, mid, mid);
|
||||
if (!tl->impact.plane || midf < tl->fraction) {
|
||||
VectorMultAdd (p1, frac2, dist, mid);
|
||||
c2 = traceline (node->children[side ^ 1], midf, p2f, mid, p2, tl);
|
||||
}
|
||||
|
||||
} else {
|
||||
c1 = c2 = traceline (node->children[side], p1f, p2f, p1, mid, tl);
|
||||
if (c1 != CONTENTS_SOLID)
|
||||
c2 = traceline (node->children[side ^ 1], p1f, p2f, mid, p2, tl);
|
||||
if (c1 == CONTENTS_SOLID || c2 == CONTENTS_SOLID)
|
||||
c1 = c2 = CONTENTS_SOLID;
|
||||
else
|
||||
c1 = c2 = min (c1, c2);
|
||||
}
|
||||
set_split (tl, &save, 0);
|
||||
if (cross) {
|
||||
if (c1 != CONTENTS_SOLID && c2 == CONTENTS_SOLID)
|
||||
impact (tl);
|
||||
restore_split (tl, &split);
|
||||
if (c1 == CONTENTS_SOLID && !(tl->flags & 0xc))
|
||||
tl->flags |= 2;
|
||||
impact (tl, &split);
|
||||
if (c1 == CONTENTS_SOLID && !(tl->flags & SOLID))
|
||||
tl->flags |= STARTSOLID;
|
||||
if (c1 == CONTENTS_EMPTY || c2 == CONTENTS_EMPTY) {
|
||||
tl->flags &= ~1;
|
||||
tl->flags |= 4;
|
||||
tl->flags &= ~ALLSOLID;
|
||||
tl->flags |= INOPEN;
|
||||
}
|
||||
if (c1 < CONTENTS_SOLID || c2 < CONTENTS_SOLID) {
|
||||
tl->flags &= ~1;
|
||||
tl->flags |= 8;
|
||||
tl->flags &= ~ALLSOLID;
|
||||
tl->flags |= INWATER;
|
||||
}
|
||||
|
||||
return frac2 ? c1 : c2;
|
||||
return c1;
|
||||
//return frac2 ? c1 : c2;
|
||||
} else {
|
||||
if (c1 == CONTENTS_SOLID || c2 == CONTENTS_SOLID) {
|
||||
if (!p1f) {
|
||||
tl->flags &= SOLID;
|
||||
tl->flags |= STARTSOLID;
|
||||
}
|
||||
return CONTENTS_SOLID;
|
||||
}
|
||||
if (c1 == CONTENTS_EMPTY && c2 == CONTENTS_EMPTY) {
|
||||
tl->flags &= ~ALLSOLID;
|
||||
tl->flags |= INOPEN;
|
||||
} else {
|
||||
tl->flags &= ~ALLSOLID;
|
||||
tl->flags |= INWATER;
|
||||
}
|
||||
return min (c1, c2); //FIXME correct?
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -482,30 +408,29 @@ MOD_TraceLine (hull_t *hull, int num,
|
|||
|
||||
tl.start = start_point;
|
||||
tl.end = end_point;
|
||||
tl.hull = *hull;
|
||||
tl.fraction = 1;
|
||||
set_split (&tl, 0, 0, 0);
|
||||
set_straddle (&tl, 0, 0, 0);
|
||||
set_impact (&tl, 0, 0);
|
||||
tl.flags = 1;
|
||||
tl.isbox = trace->isbox;
|
||||
tl.extents = trace->extents;
|
||||
tl.isbox = trace->isbox;
|
||||
tl.hull = *hull;
|
||||
set_split (&tl, 0, 0);
|
||||
set_impact (&tl, 0, 0);
|
||||
tl.fraction = 1;
|
||||
tl.flags = ALLSOLID;
|
||||
c = traceline (num, 0, 1, start_point, end_point, &tl);
|
||||
if (c == CONTENTS_EMPTY) {
|
||||
tl.flags &= ~1;
|
||||
tl.flags |= 4;
|
||||
tl.flags &= ~ALLSOLID;
|
||||
tl.flags |= INOPEN;
|
||||
}
|
||||
if (c < CONTENTS_SOLID) {
|
||||
tl.flags &= ~1;
|
||||
tl.flags |= 8;
|
||||
tl.flags &= ~ALLSOLID;
|
||||
tl.flags |= INOPEN;
|
||||
}
|
||||
if (tl.fraction < 1) {
|
||||
calc_impact (trace, start_point, end_point, tl.impact.plane);
|
||||
}
|
||||
trace->allsolid = (tl.flags & 1) != 0;
|
||||
trace->startsolid = (tl.flags & 2) != 0;
|
||||
trace->inopen = (tl.flags & 4) != 0;
|
||||
trace->inwater = (tl.flags & 8) != 0;
|
||||
trace->allsolid = (tl.flags & ALLSOLID) != 0;
|
||||
trace->startsolid = (tl.flags & STARTSOLID) != 0;
|
||||
trace->inopen = (tl.flags & INOPEN) != 0;
|
||||
trace->inwater = (tl.flags & INWATER) != 0;
|
||||
}
|
||||
#else
|
||||
typedef struct {
|
||||
|
|
|
|||
Loading…
Reference in New Issue