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Give the fields of pstack_t clearer names.
And some comments.
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1ea79e8626
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2 changed files with 36 additions and 31 deletions
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@ -98,10 +98,11 @@ typedef struct cluster_s {
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typedef struct pstack_s {
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struct pstack_s *next; ///< linked list of active stack objects
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cluster_t *cluster;
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portal_t *portal; // portal exiting
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winding_t *source, *pass;
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plane_t portalplane;
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cluster_t *cluster; ///< the cluster being sub-vised
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winding_t *source_winding; ///< clipped source portal winding
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portal_t *pass_portal; ///< the portal exiting from the cluster
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winding_t *pass_winding; ///< clipped pass portal winding
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plane_t pass_plane; ///< plane of the pass portal
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sep_t *separators[2];
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set_t mightsee;
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} pstack_t;
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@ -298,7 +298,7 @@ RecursiveClusterFlow (int clusternum, threaddata_t *thread, pstack_t *prevstack)
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}
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stack->cluster = cluster;
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stack->portal = NULL;
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stack->pass_portal = NULL;
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stack->separators[0] = 0;
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stack->separators[1] = 0;
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might = &stack->mightsee;
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@ -319,37 +319,38 @@ RecursiveClusterFlow (int clusternum, threaddata_t *thread, pstack_t *prevstack)
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}
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// get plane of portal, point normal into the neighbor cluster
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stack->portalplane = portal->plane;
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VectorNegate (portal->plane.normal, backplane.normal);
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backplane.dist = -portal->plane.dist;
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if (_VectorCompare (prevstack->portalplane.normal, backplane.normal))
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if (_VectorCompare (prevstack->pass_plane.normal, backplane.normal))
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continue; // can't go out a coplanar face
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thread->stats.portalcheck++;
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stack->portal = portal;
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target = ClipWinding (portal->winding,
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&thread->pstack_head->portalplane, false);
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&thread->pstack_head->pass_plane, false);
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if (!target)
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continue;
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if (!prevstack->pass) {
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if (!prevstack->pass_winding) {
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// the second cluster can be blocked only if coplanar
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stack->source = prevstack->source;
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stack->pass = target;
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stack->source_winding = prevstack->source_winding;
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stack->pass_winding = target;
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stack->pass_plane = portal->plane;
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stack->pass_portal = portal;
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RecursiveClusterFlow (portal->cluster, thread, stack);
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FreeWinding (target);
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continue;
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}
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target = ClipWinding (target, &prevstack->portalplane, false);
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target = ClipWinding (target, &prevstack->pass_plane, false);
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if (!target)
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continue;
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source = CopyWinding (prevstack->source);
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source = CopyWinding (prevstack->source_winding);
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source = ClipWinding (source, &backplane, false);
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if (!source) {
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@ -363,12 +364,12 @@ RecursiveClusterFlow (int clusternum, threaddata_t *thread, pstack_t *prevstack)
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if (options.level > 0) {
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// clip target to the image that would be formed by a laser
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// pointing from the edges of source passing though the corners of
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// pass
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// pass_winding
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winding_t *old = target;
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if (!stack->separators[0])
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stack->separators[0] = FindSeparators (thread, source,
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thread->pstack_head->portalplane,
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prevstack->pass, 0);
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thread->pstack_head->pass_plane,
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prevstack->pass_winding, 0);
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target = ClipToSeparators (stack->separators[0], target);
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if (!target) {
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thread->stats.targetclipped++;
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@ -380,16 +381,16 @@ RecursiveClusterFlow (int clusternum, threaddata_t *thread, pstack_t *prevstack)
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}
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if (options.level > 1) {
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// now pass the laser along the edges of pass from the corners of
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// now pass the laser along the edges of pass_winding from the corners of
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// source. the resulting image will have a smaller aree. The
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// resulting shape will be the light image produced by a backlit
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// source shining past pass. eg, if source and pass are equilateral
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// source shining past pass_winding. eg, if source and pass_winding are equilateral
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// triangles rotated 60 (or 180) degrees relative to each other,
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// parallel and in line, target will wind up being a hexagon.
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winding_t *old = target;
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if (!stack->separators[1])
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stack->separators[1] = FindSeparators (thread, prevstack->pass,
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prevstack->portalplane,
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stack->separators[1] = FindSeparators (thread, prevstack->pass_winding,
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prevstack->pass_plane,
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source, 1);
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target = ClipToSeparators (stack->separators[1], target);
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if (!target) {
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@ -408,7 +409,7 @@ RecursiveClusterFlow (int clusternum, threaddata_t *thread, pstack_t *prevstack)
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winding_t *old = source;
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sep_t *sep;
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sep = FindSeparators (thread, target, portal->plane,
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prevstack->pass, 0);
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prevstack->pass_winding, 0);
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source = ClipToSeparators (sep, source);
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free_separators (thread, sep);
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if (!source) {
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@ -423,8 +424,8 @@ RecursiveClusterFlow (int clusternum, threaddata_t *thread, pstack_t *prevstack)
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if (options.level > 3) {
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winding_t *old = source;
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sep_t *sep;
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sep = FindSeparators (thread, prevstack->pass,
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prevstack->portalplane, target, 1);
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sep = FindSeparators (thread, prevstack->pass_winding,
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prevstack->pass_plane, target, 1);
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source = ClipToSeparators (sep, source);
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free_separators (thread, sep);
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if (!source) {
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@ -436,8 +437,11 @@ RecursiveClusterFlow (int clusternum, threaddata_t *thread, pstack_t *prevstack)
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thread->stats.sourcetrimmed++;
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}
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stack->source = source;
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stack->pass = target;
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stack->source_winding = source;
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stack->pass_winding = target;
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stack->pass_plane = portal->plane;
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stack->pass_portal = portal;
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thread->stats.portalpass++;
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@ -467,10 +471,10 @@ PortalFlow (threaddata_t *data, portal_t *portal)
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if (!data->pstack_head)
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data->pstack_head = new_stack ();
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data->pstack_head->cluster = 0;
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data->pstack_head->portal = portal;
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data->pstack_head->source = portal->winding;
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data->pstack_head->pass = 0;
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data->pstack_head->portalplane = portal->plane;
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data->pstack_head->pass_portal = portal;
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data->pstack_head->source_winding = portal->winding;
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data->pstack_head->pass_winding = 0;
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data->pstack_head->pass_plane = portal->plane;
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set_assign (&data->pstack_head->mightsee, portal->mightsee);
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data->pstack_head->separators[0] = 0;
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data->pstack_head->separators[1] = 0;
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