742 lines
18 KiB
C++
742 lines
18 KiB
C++
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#include "cm_local.h"
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/*
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===============================================================================
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POSITION TESTING
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===============================================================================
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*/
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/*
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================
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CM_TestBoxInBrush
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================
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*/
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void CM_TestBoxInBrush( traceWork_t *tw, cbrush_t *brush ) {
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int i;
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cplane_t *plane;
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float dist;
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float d1;
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cbrushside_t *side;
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if (!brush->numsides) {
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return;
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}
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// special test for axial
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if ( tw->bounds[0][0] > brush->bounds[1][0]
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|| tw->bounds[0][1] > brush->bounds[1][1]
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|| tw->bounds[0][2] > brush->bounds[1][2]
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|| tw->bounds[1][0] < brush->bounds[0][0]
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|| tw->bounds[1][1] < brush->bounds[0][1]
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|| tw->bounds[1][2] < brush->bounds[0][2]
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) {
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return;
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}
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// the first six planes are the axial planes, so we only
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// need to test the remainder
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for ( i = 6 ; i < brush->numsides ; i++ ) {
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side = brush->sides + i;
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plane = side->plane;
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// adjust the plane distance apropriately for mins/maxs
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dist = plane->dist - DotProduct( tw->offsets[ plane->signbits ], plane->normal );
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d1 = DotProduct( tw->start, plane->normal ) - dist;
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// if completely in front of face, no intersection
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if ( d1 > 0 ) {
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return;
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}
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}
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// inside this brush
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tw->trace.startsolid = tw->trace.allsolid = qtrue;
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tw->trace.fraction = 0;
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tw->trace.contents = brush->contents;
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}
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/*
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================
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CM_TestInLeaf
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================
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*/
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void CM_TestInLeaf( traceWork_t *tw, cLeaf_t *leaf ) {
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int k;
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int brushnum;
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cbrush_t *b;
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cPatch_t *patch;
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// test box position against all brushes in the leaf
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for (k=0 ; k<leaf->numLeafBrushes ; k++) {
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brushnum = cm.leafbrushes[leaf->firstLeafBrush+k];
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b = &cm.brushes[brushnum];
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if (b->checkcount == cm.checkcount) {
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continue; // already checked this brush in another leaf
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}
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b->checkcount = cm.checkcount;
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if ( !(b->contents & tw->contents)) {
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continue;
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}
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CM_TestBoxInBrush( tw, b );
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if ( tw->trace.allsolid ) {
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return;
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}
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}
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// test against all patches
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#ifdef BSPC
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if (1) {
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#else
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if ( !cm_noCurves->integer ) {
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#endif //BSPC
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for ( k = 0 ; k < leaf->numLeafSurfaces ; k++ ) {
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patch = cm.surfaces[ cm.leafsurfaces[ leaf->firstLeafSurface + k ] ];
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if ( !patch ) {
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continue;
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}
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if ( patch->checkcount == cm.checkcount ) {
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continue; // already checked this brush in another leaf
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}
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patch->checkcount = cm.checkcount;
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if ( !(patch->contents & tw->contents)) {
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continue;
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}
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if ( CM_PositionTestInPatchCollide( tw, patch->pc ) ) {
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tw->trace.startsolid = tw->trace.allsolid = qtrue;
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tw->trace.fraction = 0;
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tw->trace.contents = patch->contents;
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return;
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}
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}
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}
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}
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/*
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==================
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CM_PositionTest
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==================
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*/
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#define MAX_POSITION_LEAFS 1024
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void CM_PositionTest( traceWork_t *tw ) {
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int leafs[MAX_POSITION_LEAFS];
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int i;
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leafList_t ll;
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// identify the leafs we are touching
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VectorAdd( tw->start, tw->size[0], ll.bounds[0] );
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VectorAdd( tw->start, tw->size[1], ll.bounds[1] );
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for (i=0 ; i<3 ; i++) {
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ll.bounds[0][i] -= 1;
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ll.bounds[1][i] += 1;
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}
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ll.count = 0;
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ll.maxcount = MAX_POSITION_LEAFS;
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ll.list = leafs;
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ll.storeLeafs = CM_StoreLeafs;
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ll.lastLeaf = 0;
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ll.overflowed = qfalse;
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cm.checkcount++;
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CM_BoxLeafnums_r( &ll, 0 );
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cm.checkcount++;
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// test the contents of the leafs
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for (i=0 ; i < ll.count ; i++) {
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CM_TestInLeaf( tw, &cm.leafs[leafs[i]] );
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if ( tw->trace.allsolid ) {
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break;
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}
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}
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}
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/*
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===============================================================================
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BOX TRACING
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===============================================================================
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*/
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/*
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================
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CM_TraceThroughPatch
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================
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*/
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void CM_TraceThroughPatch( traceWork_t *tw, cPatch_t *patch ) {
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float oldFrac;
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c_patch_traces++;
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oldFrac = tw->trace.fraction;
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CM_TraceThroughPatchCollide( tw, patch->pc );
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if ( tw->trace.fraction < oldFrac ) {
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tw->trace.surfaceFlags = patch->surfaceFlags;
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tw->trace.contents = patch->contents;
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}
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}
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/*
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================
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CM_TraceThroughBrush
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================
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*/
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void CM_TraceThroughBrush( traceWork_t *tw, cbrush_t *brush ) {
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int i;
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cplane_t *plane, *clipplane;
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float dist;
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float enterFrac, leaveFrac;
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float d1, d2;
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qboolean getout, startout;
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float f;
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cbrushside_t *side, *leadside;
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enterFrac = -1.0;
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leaveFrac = 1.0;
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clipplane = NULL;
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if ( !brush->numsides ) {
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return;
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}
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c_brush_traces++;
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getout = qfalse;
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startout = qfalse;
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leadside = NULL;
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//
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// compare the trace against all planes of the brush
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// find the latest time the trace crosses a plane towards the interior
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// and the earliest time the trace crosses a plane towards the exterior
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//
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for (i=0 ; i<brush->numsides ; i++) {
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side = brush->sides + i;
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plane = side->plane;
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// adjust the plane distance apropriately for mins/maxs
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dist = plane->dist - DotProduct( tw->offsets[ plane->signbits ], plane->normal );
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d1 = DotProduct( tw->start, plane->normal ) - dist;
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d2 = DotProduct( tw->end, plane->normal ) - dist;
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if (d2 > 0) {
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getout = qtrue; // endpoint is not in solid
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}
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if (d1 > 0) {
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startout = qtrue;
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}
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// if completely in front of face, no intersection with the entire brush
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if (d1 > 0 && ( d2 >= SURFACE_CLIP_EPSILON || d2 >= d1 ) ) {
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return;
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}
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// if it doesn't cross the plane, the plane isn't relevent
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if (d1 <= 0 && d2 <= 0 ) {
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continue;
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}
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// crosses face
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if (d1 > d2) { // enter
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f = (d1-SURFACE_CLIP_EPSILON) / (d1-d2);
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if ( f < 0 ) {
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f = 0;
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}
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if (f > enterFrac) {
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enterFrac = f;
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clipplane = plane;
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leadside = side;
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}
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} else { // leave
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f = (d1+SURFACE_CLIP_EPSILON) / (d1-d2);
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if ( f > 1 ) {
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f = 1;
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}
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if (f < leaveFrac) {
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leaveFrac = f;
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}
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}
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}
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//
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// all planes have been checked, and the trace was not
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// completely outside the brush
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//
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if (!startout) { // original point was inside brush
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tw->trace.startsolid = qtrue;
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tw->trace.contents |= brush->contents; //note, we always want to know the contents of something we're inside of
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if (!getout)
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{ //endpoint was inside brush
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tw->trace.allsolid = qtrue;
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tw->trace.fraction = 0;
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}
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return;
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}
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if (enterFrac < leaveFrac) {
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if (enterFrac > -1 && enterFrac < tw->trace.fraction) {
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if (enterFrac < 0) {
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enterFrac = 0;
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}
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tw->trace.fraction = enterFrac;
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tw->trace.plane = *clipplane;
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tw->trace.surfaceFlags = leadside->surfaceFlags;
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tw->trace.contents = brush->contents;
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}
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}
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}
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/*
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================
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CM_TraceToLeaf
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================
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*/
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void CM_TraceToLeaf( traceWork_t *tw, cLeaf_t *leaf ) {
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int k;
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int brushnum;
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cbrush_t *b;
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cPatch_t *patch;
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// trace line against all brushes in the leaf
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for ( k = 0 ; k < leaf->numLeafBrushes ; k++ ) {
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brushnum = cm.leafbrushes[leaf->firstLeafBrush+k];
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b = &cm.brushes[brushnum];
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if ( b->checkcount == cm.checkcount ) {
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continue; // already checked this brush in another leaf
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}
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b->checkcount = cm.checkcount;
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if ( !(b->contents & tw->contents) ) {
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continue;
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}
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//if (b->contents & CONTENTS_PLAYERCLIP) continue;
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CM_TraceThroughBrush( tw, b );
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if ( !tw->trace.fraction ) {
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return;
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}
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}
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// trace line against all patches in the leaf
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#ifdef BSPC
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if (1) {
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#else
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if ( !cm_noCurves->integer ) {
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#endif
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for ( k = 0 ; k < leaf->numLeafSurfaces ; k++ ) {
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patch = cm.surfaces[ cm.leafsurfaces[ leaf->firstLeafSurface + k ] ];
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if ( !patch ) {
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continue;
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}
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if ( patch->checkcount == cm.checkcount ) {
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continue; // already checked this patch in another leaf
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}
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patch->checkcount = cm.checkcount;
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if ( !(patch->contents & tw->contents) ) {
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continue;
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}
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CM_TraceThroughPatch( tw, patch );
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if ( !tw->trace.fraction ) {
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return;
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}
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}
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}
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}
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//=========================================================================================
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/*
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==================
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CM_TraceThroughTree
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Traverse all the contacted leafs from the start to the end position.
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If the trace is a point, they will be exactly in order, but for larger
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trace volumes it is possible to hit something in a later leaf with
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a smaller intercept fraction.
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==================
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*/
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void CM_TraceThroughTree( traceWork_t *tw, int num, float p1f, float p2f, vec3_t p1, vec3_t p2) {
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cNode_t *node;
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cplane_t *plane;
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float t1, t2, offset;
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float frac, frac2;
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float idist;
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vec3_t mid;
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int side;
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float midf;
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if (tw->trace.fraction <= p1f) {
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return; // already hit something nearer
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}
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// if < 0, we are in a leaf node
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if (num < 0) {
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CM_TraceToLeaf( tw, &cm.leafs[-1-num] );
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return;
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}
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//
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// find the point distances to the seperating plane
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// and the offset for the size of the box
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//
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node = cm.nodes + num;
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plane = node->plane;
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#if 0
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// uncomment this to test against every leaf in the world for debugging
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CM_TraceThroughTree( tw, node->children[0], p1f, p2f, p1, p2 );
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CM_TraceThroughTree( tw, node->children[1], p1f, p2f, p1, p2 );
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return;
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#endif
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// adjust the plane distance apropriately for mins/maxs
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if ( plane->type < 3 ) {
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t1 = p1[plane->type] - plane->dist;
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t2 = p2[plane->type] - plane->dist;
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offset = tw->extents[plane->type];
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} else {
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t1 = DotProduct (plane->normal, p1) - plane->dist;
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t2 = DotProduct (plane->normal, p2) - plane->dist;
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if ( tw->isPoint ) {
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offset = 0;
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} else {
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// an axial brush right behind a slanted bsp plane
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// will poke through when expanded, so adjust
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// by sqrt(3)
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offset = fabs(tw->extents[0]*plane->normal[0]) +
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fabs(tw->extents[1]*plane->normal[1]) +
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fabs(tw->extents[2]*plane->normal[2]);
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offset *= 2;
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#if 0
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CM_TraceThroughTree( tw, node->children[0], p1f, p2f, p1, p2 );
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CM_TraceThroughTree( tw, node->children[1], p1f, p2f, p1, p2 );
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return;
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#endif
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offset = tw->maxOffset;
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offset = 2048;
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}
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}
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// see which sides we need to consider
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if ( t1 >= offset + 1 && t2 >= offset + 1 ) {
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CM_TraceThroughTree( tw, node->children[0], p1f, p2f, p1, p2 );
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return;
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}
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if ( t1 < -offset - 1 && t2 < -offset - 1 ) {
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CM_TraceThroughTree( tw, node->children[1], p1f, p2f, p1, p2 );
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return;
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}
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// put the crosspoint SURFACE_CLIP_EPSILON pixels on the near side
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if ( t1 < t2 ) {
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idist = 1.0/(t1-t2);
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side = 1;
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frac2 = (t1 + offset + SURFACE_CLIP_EPSILON)*idist;
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frac = (t1 - offset + SURFACE_CLIP_EPSILON)*idist;
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} else if (t1 > t2) {
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idist = 1.0/(t1-t2);
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side = 0;
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frac2 = (t1 - offset - SURFACE_CLIP_EPSILON)*idist;
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frac = (t1 + offset + SURFACE_CLIP_EPSILON)*idist;
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} else {
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side = 0;
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frac = 1;
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frac2 = 0;
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}
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// move up to the node
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if ( frac < 0 ) {
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frac = 0;
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}
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if ( frac > 1 ) {
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frac = 1;
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}
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midf = p1f + (p2f - p1f)*frac;
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mid[0] = p1[0] + frac*(p2[0] - p1[0]);
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mid[1] = p1[1] + frac*(p2[1] - p1[1]);
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mid[2] = p1[2] + frac*(p2[2] - p1[2]);
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CM_TraceThroughTree( tw, node->children[side], p1f, midf, p1, mid );
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// go past the node
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if ( frac2 < 0 ) {
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frac2 = 0;
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}
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if ( frac2 > 1 ) {
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frac2 = 1;
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}
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midf = p1f + (p2f - p1f)*frac2;
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mid[0] = p1[0] + frac2*(p2[0] - p1[0]);
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mid[1] = p1[1] + frac2*(p2[1] - p1[1]);
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mid[2] = p1[2] + frac2*(p2[2] - p1[2]);
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CM_TraceThroughTree( tw, node->children[side^1], midf, p2f, mid, p2 );
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}
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//======================================================================
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/*
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==================
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CM_BoxTrace
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==================
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*/
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void CM_BoxTrace( trace_t *results, const vec3_t start, const vec3_t end,
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const vec3_t mins, const vec3_t maxs,
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clipHandle_t model, int brushmask) {
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int i;
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traceWork_t tw;
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vec3_t offset;
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cmodel_t *cmod;
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cmod = CM_ClipHandleToModel( model );
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cm.checkcount++; // for multi-check avoidance
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c_traces++; // for statistics, may be zeroed
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// fill in a default trace
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memset( &tw, 0, sizeof(tw) - sizeof(tw.trace.G2CollisionMap));
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tw.trace.fraction = 1; // assume it goes the entire distance until shown otherwise
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if (!cm.numNodes) {
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*results = tw.trace;
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return; // map not loaded, shouldn't happen
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}
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// allow NULL to be passed in for 0,0,0
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if ( !mins ) {
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mins = vec3_origin;
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}
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if ( !maxs ) {
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maxs = vec3_origin;
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}
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// set basic parms
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tw.contents = brushmask;
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// adjust so that mins and maxs are always symetric, which
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// avoids some complications with plane expanding of rotated
|
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// bmodels
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for ( i = 0 ; i < 3 ; i++ ) {
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offset[i] = ( mins[i] + maxs[i] ) * 0.5;
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tw.size[0][i] = mins[i] - offset[i];
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tw.size[1][i] = maxs[i] - offset[i];
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tw.start[i] = start[i] + offset[i];
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tw.end[i] = end[i] + offset[i];
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}
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tw.maxOffset = tw.size[1][0] + tw.size[1][1] + tw.size[1][2];
|
|
|
|
// tw.offsets[signbits] = vector to apropriate corner from origin
|
|
tw.offsets[0][0] = tw.size[0][0];
|
|
tw.offsets[0][1] = tw.size[0][1];
|
|
tw.offsets[0][2] = tw.size[0][2];
|
|
|
|
tw.offsets[1][0] = tw.size[1][0];
|
|
tw.offsets[1][1] = tw.size[0][1];
|
|
tw.offsets[1][2] = tw.size[0][2];
|
|
|
|
tw.offsets[2][0] = tw.size[0][0];
|
|
tw.offsets[2][1] = tw.size[1][1];
|
|
tw.offsets[2][2] = tw.size[0][2];
|
|
|
|
tw.offsets[3][0] = tw.size[1][0];
|
|
tw.offsets[3][1] = tw.size[1][1];
|
|
tw.offsets[3][2] = tw.size[0][2];
|
|
|
|
tw.offsets[4][0] = tw.size[0][0];
|
|
tw.offsets[4][1] = tw.size[0][1];
|
|
tw.offsets[4][2] = tw.size[1][2];
|
|
|
|
tw.offsets[5][0] = tw.size[1][0];
|
|
tw.offsets[5][1] = tw.size[0][1];
|
|
tw.offsets[5][2] = tw.size[1][2];
|
|
|
|
tw.offsets[6][0] = tw.size[0][0];
|
|
tw.offsets[6][1] = tw.size[1][1];
|
|
tw.offsets[6][2] = tw.size[1][2];
|
|
|
|
tw.offsets[7][0] = tw.size[1][0];
|
|
tw.offsets[7][1] = tw.size[1][1];
|
|
tw.offsets[7][2] = tw.size[1][2];
|
|
|
|
|
|
//
|
|
// calculate bounds
|
|
//
|
|
for ( i = 0 ; i < 3 ; i++ ) {
|
|
if ( tw.start[i] < tw.end[i] ) {
|
|
tw.bounds[0][i] = tw.start[i] + tw.size[0][i];
|
|
tw.bounds[1][i] = tw.end[i] + tw.size[1][i];
|
|
} else {
|
|
tw.bounds[0][i] = tw.end[i] + tw.size[0][i];
|
|
tw.bounds[1][i] = tw.start[i] + tw.size[1][i];
|
|
}
|
|
}
|
|
|
|
//
|
|
// check for position test special case
|
|
//
|
|
if (start[0] == end[0] && start[1] == end[1] && start[2] == end[2]) {
|
|
if ( model ) {
|
|
CM_TestInLeaf( &tw, &cmod->leaf );
|
|
} else {
|
|
CM_PositionTest( &tw );
|
|
}
|
|
} else {
|
|
//
|
|
// check for point special case
|
|
//
|
|
if ( tw.size[0][0] == 0 && tw.size[0][1] == 0 && tw.size[0][2] == 0 ) {
|
|
tw.isPoint = qtrue;
|
|
VectorClear( tw.extents );
|
|
} else {
|
|
tw.isPoint = qfalse;
|
|
tw.extents[0] = tw.size[1][0];
|
|
tw.extents[1] = tw.size[1][1];
|
|
tw.extents[2] = tw.size[1][2];
|
|
}
|
|
|
|
//
|
|
// general sweeping through world
|
|
//
|
|
if ( model ) {
|
|
CM_TraceToLeaf( &tw, &cmod->leaf );
|
|
} else {
|
|
CM_TraceThroughTree( &tw, 0, 0, 1, tw.start, tw.end );
|
|
}
|
|
}
|
|
|
|
// generate endpos from the original, unmodified start/end
|
|
if ( tw.trace.fraction == 1 ) {
|
|
VectorCopy (end, tw.trace.endpos);
|
|
} else {
|
|
for ( i=0 ; i<3 ; i++ ) {
|
|
tw.trace.endpos[i] = start[i] + tw.trace.fraction * (end[i] - start[i]);
|
|
}
|
|
}
|
|
|
|
*results = tw.trace;
|
|
}
|
|
|
|
|
|
/*
|
|
==================
|
|
CM_TransformedBoxTrace
|
|
|
|
Handles offseting and rotation of the end points for moving and
|
|
rotating entities
|
|
==================
|
|
*/
|
|
void CM_TransformedBoxTrace( trace_t *results, const vec3_t start, const vec3_t end,
|
|
const vec3_t mins, const vec3_t maxs,
|
|
clipHandle_t model, int brushmask,
|
|
const vec3_t origin, const vec3_t angles) {
|
|
trace_t trace;
|
|
vec3_t start_l, end_l;
|
|
vec3_t a;
|
|
vec3_t forward, right, up;
|
|
vec3_t temp;
|
|
qboolean rotated;
|
|
vec3_t offset;
|
|
vec3_t symetricSize[2];
|
|
int i;
|
|
|
|
if ( !mins ) {
|
|
mins = vec3_origin;
|
|
}
|
|
if ( !maxs ) {
|
|
maxs = vec3_origin;
|
|
}
|
|
|
|
// adjust so that mins and maxs are always symetric, which
|
|
// avoids some complications with plane expanding of rotated
|
|
// bmodels
|
|
for ( i = 0 ; i < 3 ; i++ ) {
|
|
offset[i] = ( mins[i] + maxs[i] ) * 0.5;
|
|
symetricSize[0][i] = mins[i] - offset[i];
|
|
symetricSize[1][i] = maxs[i] - offset[i];
|
|
start_l[i] = start[i] + offset[i];
|
|
end_l[i] = end[i] + offset[i];
|
|
}
|
|
|
|
// subtract origin offset
|
|
VectorSubtract( start_l, origin, start_l );
|
|
VectorSubtract( end_l, origin, end_l );
|
|
|
|
// rotate start and end into the models frame of reference
|
|
if ( model != BOX_MODEL_HANDLE &&
|
|
(angles[0] || angles[1] || angles[2]) ) {
|
|
rotated = qtrue;
|
|
} else {
|
|
rotated = qfalse;
|
|
}
|
|
|
|
if (rotated) {
|
|
AngleVectors (angles, forward, right, up);
|
|
|
|
VectorCopy (start_l, temp);
|
|
start_l[0] = DotProduct (temp, forward);
|
|
start_l[1] = -DotProduct (temp, right);
|
|
start_l[2] = DotProduct (temp, up);
|
|
|
|
VectorCopy (end_l, temp);
|
|
end_l[0] = DotProduct (temp, forward);
|
|
end_l[1] = -DotProduct (temp, right);
|
|
end_l[2] = DotProduct (temp, up);
|
|
}
|
|
|
|
// sweep the box through the model
|
|
CM_BoxTrace( &trace, start_l, end_l, symetricSize[0], symetricSize[1], model, brushmask);
|
|
|
|
if ( rotated && trace.fraction != 1.0 ) {
|
|
// FIXME: figure out how to do this with existing angles
|
|
VectorNegate (angles, a);
|
|
AngleVectors (a, forward, right, up);
|
|
|
|
VectorCopy (trace.plane.normal, temp);
|
|
trace.plane.normal[0] = DotProduct (temp, forward);
|
|
trace.plane.normal[1] = -DotProduct (temp, right);
|
|
trace.plane.normal[2] = DotProduct (temp, up);
|
|
}
|
|
|
|
trace.endpos[0] = start[0] + trace.fraction * (end[0] - start[0]);
|
|
trace.endpos[1] = start[1] + trace.fraction * (end[1] - start[1]);
|
|
trace.endpos[2] = start[2] + trace.fraction * (end[2] - start[2]);
|
|
|
|
*results = trace;
|
|
}
|
|
|