mirror of https://github.com/AxioDL/metaforce.git
366 lines
12 KiB
C++
366 lines
12 KiB
C++
#include "CPathFindSearch.hpp"
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#include "Graphics/CGraphics.hpp"
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namespace urde {
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CPathFindSearch::CPathFindSearch(CPFArea* area, u32 flags, u32 index, float chRadius, float chHeight)
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: x0_area(area), xd0_chHeight(chHeight), xd4_chRadius(chRadius), xdc_flags(flags), xe0_indexMask(1u << index) {}
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CPathFindSearch::EResult CPathFindSearch::FindClosestReachablePoint(const zeus::CVector3f& p1,
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zeus::CVector3f& p2) const {
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if (!x0_area)
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return EResult::InvalidArea;
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/* Work in local PFArea coordinates */
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zeus::CVector3f localP1 = x0_area->x188_transform.transposeRotate(p1 - x0_area->x188_transform.origin);
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zeus::CVector3f localP2 = x0_area->x188_transform.transposeRotate(p2 - x0_area->x188_transform.origin);
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/* Raise a bit above ground for step-up resolution */
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if (!(xdc_flags & 0x2) && !(xdc_flags & 0x4)) {
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localP2.z() += 0.3f;
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localP1.z() += 0.3f;
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}
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rstl::reserved_vector<CPFRegion*, 4> regions;
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if (x0_area->FindRegions(regions, localP1, xdc_flags, xe0_indexMask) == 0) {
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/* Point outside PATH; find nearest region point */
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CPFRegion* region = x0_area->FindClosestRegion(localP1, xdc_flags, xe0_indexMask, xd8_padding);
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if (!region)
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return EResult::NoSourcePoint;
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regions.push_back(region);
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}
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/* Override dest point to be reachable */
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zeus::CVector3f closestPoint =
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x0_area->FindClosestReachablePoint(regions, localP2, xdc_flags, xe0_indexMask) + zeus::CVector3f(0.f, 0.f, 3.f);
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p2 = x0_area->x188_transform * closestPoint;
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return EResult::Success;
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}
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CPathFindSearch::EResult CPathFindSearch::PathExists(const zeus::CVector3f& p1, const zeus::CVector3f& p2) const {
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if (!x0_area)
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return EResult::InvalidArea;
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/* Work in local PFArea coordinates */
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zeus::CVector3f localP1 = x0_area->x188_transform.transposeRotate(p1 - x0_area->x188_transform.origin);
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zeus::CVector3f localP2 = x0_area->x188_transform.transposeRotate(p2 - x0_area->x188_transform.origin);
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/* Raise a bit above ground for step-up resolution */
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if (!(xdc_flags & 0x2) && !(xdc_flags & 0x4)) {
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localP2.z() += 0.3f;
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localP1.z() += 0.3f;
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}
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rstl::reserved_vector<CPFRegion*, 4> regions1;
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if (x0_area->FindRegions(regions1, localP1, xdc_flags, xe0_indexMask) == 0)
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return EResult::NoSourcePoint;
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rstl::reserved_vector<CPFRegion*, 4> regions2;
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if (x0_area->FindRegions(regions2, localP2, xdc_flags, xe0_indexMask) == 0)
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return EResult::NoDestPoint;
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for (CPFRegion* reg1 : regions1)
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for (CPFRegion* reg2 : regions2)
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if (reg1 == reg2 || x0_area->PathExists(reg1, reg2, xdc_flags))
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return EResult::Success;
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return EResult::NoPath;
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}
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CPathFindSearch::EResult CPathFindSearch::OnPath(const zeus::CVector3f& p1) const {
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if (!x0_area)
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return EResult::InvalidArea;
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/* Work in local PFArea coordinates */
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zeus::CVector3f localP1 = x0_area->x188_transform.transposeRotate(p1 - x0_area->x188_transform.origin);
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/* Raise a bit above ground for step-up resolution */
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if (!(xdc_flags & 0x2) && !(xdc_flags & 0x4))
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localP1.z() += 0.3f;
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rstl::reserved_vector<CPFRegion*, 4> regions1;
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if (x0_area->FindRegions(regions1, localP1, xdc_flags, xe0_indexMask) == 0)
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return EResult::NoSourcePoint;
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return EResult::Success;
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}
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CPathFindSearch::EResult CPathFindSearch::Search(const zeus::CVector3f& p1, const zeus::CVector3f& p2) {
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u32 firstPoint = 0;
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u32 flyToOutsidePoint = 0;
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x4_waypoints.clear();
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xc8_curWaypoint = 0;
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if (!x0_area || x0_area->x150_regions.size() > 512) {
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xcc_result = EResult::InvalidArea;
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return xcc_result;
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}
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if (zeus::close_enough(p1, p2)) {
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/* That was easy */
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x4_waypoints.push_back(p1);
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xcc_result = EResult::Success;
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return xcc_result;
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}
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/* Work in local PFArea coordinates */
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zeus::CVector3f localP1 = x0_area->x188_transform.transposeRotate(p1 - x0_area->x188_transform.origin);
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zeus::CVector3f localP2 = x0_area->x188_transform.transposeRotate(p2 - x0_area->x188_transform.origin);
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/* Raise a bit above ground for step-up resolution */
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if (!(xdc_flags & 0x2) && !(xdc_flags & 0x4)) {
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localP2.z() += 0.3f;
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localP1.z() += 0.3f;
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}
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rstl::reserved_vector<CPFRegion*, 4> regions1;
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rstl::reserved_vector<zeus::CVector3f, 16> points;
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if (x0_area->FindRegions(regions1, localP1, xdc_flags, xe0_indexMask) == 0) {
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/* Point outside PATH; find nearest region point */
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CPFRegion* region = x0_area->FindClosestRegion(localP1, xdc_flags, xe0_indexMask, xd8_padding);
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if (!region) {
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xcc_result = EResult::NoSourcePoint;
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return xcc_result;
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}
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if (xdc_flags & 0x2 || xdc_flags & 0x4) {
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points.push_back(localP1);
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firstPoint = 1;
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}
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regions1.push_back(region);
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localP1 = x0_area->GetClosestPoint();
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}
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zeus::CVector3f finalP2 = localP2;
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rstl::reserved_vector<CPFRegion*, 4> regions2;
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if (x0_area->FindRegions(regions2, localP2, xdc_flags, xe0_indexMask) == 0) {
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/* Point outside PATH; find nearest region point */
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CPFRegion* region = x0_area->FindClosestRegion(localP2, xdc_flags, xe0_indexMask, xd8_padding);
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if (!region) {
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xcc_result = EResult::NoDestPoint;
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return xcc_result;
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}
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if (xdc_flags & 0x2 || xdc_flags & 0x4) {
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flyToOutsidePoint = 1;
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}
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regions2.push_back(region);
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localP2 = x0_area->GetClosestPoint();
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}
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rstl::reserved_vector<CPFRegion*, 4> regions1Uniq;
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rstl::reserved_vector<CPFRegion*, 4> regions2Uniq;
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bool noPath = true;
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for (CPFRegion* reg1 : regions1) {
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for (CPFRegion* reg2 : regions2) {
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if (reg1 == reg2) {
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/* Route within one region */
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if (!(xdc_flags & 0x2) && !(xdc_flags & 0x4)) {
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reg2->DropToGround(localP1);
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reg2->DropToGround(localP2);
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}
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x4_waypoints.push_back(x0_area->x188_transform * localP1);
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if (!zeus::close_enough(localP1, localP2))
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x4_waypoints.push_back(x0_area->x188_transform * localP2);
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if (flyToOutsidePoint && !zeus::close_enough(localP2, finalP2))
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x4_waypoints.push_back(x0_area->x188_transform * finalP2);
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xcc_result = EResult::Success;
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return xcc_result;
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}
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if (x0_area->PathExists(reg1, reg2, xdc_flags)) {
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/* Build unique source/dest region lists */
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if (std::find(regions1Uniq.rbegin(), regions1Uniq.rend(), reg1) == regions1Uniq.rend())
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regions1Uniq.push_back(reg1);
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if (std::find(regions2Uniq.rbegin(), regions2Uniq.rend(), reg2) == regions2Uniq.rend())
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regions2Uniq.push_back(reg2);
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noPath = false;
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}
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}
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}
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/* Perform A* algorithm if path is known to exist */
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if (noPath || !Search(regions1Uniq, localP1, regions2Uniq, localP2)) {
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xcc_result = EResult::NoPath;
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return xcc_result;
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}
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/* Set forward links with best path */
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CPFRegion* reg = regions2Uniq[0];
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u32 lastPoint = 0;
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do {
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reg->Data()->GetParent()->SetLinkTo(reg->GetIndex());
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reg = reg->Data()->GetParent();
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++lastPoint;
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} while (reg != regions1Uniq[0]);
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/* Setup point range */
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bool includeP2 = true;
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lastPoint -= 1;
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firstPoint += 1;
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lastPoint += firstPoint;
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if (lastPoint > 15)
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lastPoint = 15;
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if (lastPoint + flyToOutsidePoint + 1 > 15)
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includeP2 = false;
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/* Ensure start and finish points are on ground */
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if (!(xdc_flags & 0x2) && !(xdc_flags & 0x4)) {
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regions1Uniq[0]->DropToGround(localP1);
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regions2Uniq[0]->DropToGround(localP2);
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}
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/* Gather link points using midpoints */
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float chHalfHeight = 0.5f * xd0_chHeight;
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points.push_back(localP1);
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reg = regions1Uniq[0];
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for (u32 i = firstPoint; i <= lastPoint; ++i) {
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const CPFLink* link = reg->GetPathLink();
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CPFRegion* linkReg = &x0_area->x150_regions[link->GetRegion()];
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zeus::CVector3f midPoint = reg->GetLinkMidPoint(*link);
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if (xdc_flags & 0x2 || xdc_flags & 0x4) {
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float minHeight = std::min(reg->GetHeight(), linkReg->GetHeight());
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midPoint.z() = zeus::clamp(chHalfHeight + midPoint.z(), p2.z(), minHeight + midPoint.z() - chHalfHeight);
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}
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points.push_back(midPoint);
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reg = linkReg;
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}
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/* Gather finish points */
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if (includeP2) {
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points.push_back(localP2);
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if (flyToOutsidePoint)
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points.push_back(finalP2);
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}
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/* Optimize link points using character radius and height */
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for (int i = 0; i < 2; ++i) {
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reg = regions1Uniq[0];
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for (u32 j = firstPoint; j <= (includeP2 ? lastPoint : lastPoint - 1); ++j) {
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const CPFLink* link = reg->GetPathLink();
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CPFRegion* linkReg = &x0_area->x150_regions[link->GetRegion()];
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if (xdc_flags & 0x2 || xdc_flags & 0x4) {
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float minHeight = std::min(reg->GetHeight(), linkReg->GetHeight());
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points[j] = reg->FitThroughLink3d(points[j - 1], *link, minHeight, points[j + 1], xd4_chRadius, chHalfHeight);
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} else {
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points[j] = reg->FitThroughLink2d(points[j - 1], *link, points[j + 1], xd4_chRadius);
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}
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reg = linkReg;
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}
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}
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/* Write out points */
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for (u32 i = 0; i < points.size(); ++i)
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if (i == points.size() - 1 || !zeus::close_enough(points[i], points[i + 1]))
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x4_waypoints.push_back(x0_area->x188_transform * points[i]);
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/* Done! */
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xcc_result = EResult::Success;
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return xcc_result;
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}
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/* A* search algorithm
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* Reference: https://en.wikipedia.org/wiki/A*_search_algorithm
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*/
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bool CPathFindSearch::Search(rstl::reserved_vector<CPFRegion*, 4>& regs1, const zeus::CVector3f& p1,
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rstl::reserved_vector<CPFRegion*, 4>& regs2, const zeus::CVector3f& p2) {
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/* Reset search sets */
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x0_area->ClosedSet().Clear();
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x0_area->OpenList().Clear();
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/* Backup dest centroids */
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rstl::reserved_vector<zeus::CVector3f, 4> centroidBackup2;
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for (CPFRegion* reg2 : regs2) {
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centroidBackup2.push_back(reg2->GetCentroid());
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reg2->SetCentroid(p2);
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}
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/* Initial heuristic */
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float h = (p2 - p1).magnitude();
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/* Backup source centroids and initialize heuristics */
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rstl::reserved_vector<zeus::CVector3f, 4> centroidBackup1;
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for (CPFRegion* reg1 : regs1) {
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centroidBackup1.push_back(reg1->GetCentroid());
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reg1->SetCentroid(p1);
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reg1->Data()->Setup(nullptr, 0.f, h);
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x0_area->OpenList().Push(reg1);
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}
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/* Resolve path */
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CPFRegion* reg;
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while ((reg = x0_area->OpenList().Pop())) {
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/* Stop if we're at the destination */
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if (std::find(regs2.begin(), regs2.end(), reg) != regs2.end())
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break;
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/* Exclude region from further resolves */
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x0_area->ClosedSet().Add(reg->GetIndex());
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for (u32 i = 0; i < reg->GetNumLinks(); ++i) {
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/* Potential link to follow */
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CPFRegion* linkReg = &x0_area->x150_regions[reg->GetLink(i)->GetRegion()];
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if (linkReg != reg->Data()->GetParent() && linkReg->GetFlags() & 0xff & xdc_flags &&
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(linkReg->GetFlags() >> 16) & 0xff & xe0_indexMask) {
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/* Next G */
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float g = (linkReg->GetCentroid() - reg->GetCentroid()).magnitude() + reg->Data()->GetG();
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if ((!x0_area->ClosedSet().Test(linkReg->GetIndex()) && !x0_area->OpenList().Test(linkReg)) ||
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linkReg->Data()->GetG() > g) {
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if (x0_area->OpenList().Test(linkReg)) {
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/* In rare cases, revisiting a region will yield a lower G (actual cost) */
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x0_area->OpenList().Pop(linkReg);
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linkReg->Data()->Setup(reg, g);
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} else {
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/* Compute next heuristic */
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x0_area->ClosedSet().Rmv(linkReg->GetIndex());
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float h = (p2 - linkReg->GetCentroid()).magnitude();
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linkReg->Data()->Setup(reg, g, h);
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}
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/* Make next potential candidate */
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x0_area->OpenList().Push(linkReg);
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}
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}
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}
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}
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/* Restore source centroids */
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auto p1It = centroidBackup1.begin();
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for (CPFRegion* r : regs1)
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r->SetCentroid(*p1It++);
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/* Restore dest centroids */
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auto p2It = centroidBackup2.begin();
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for (CPFRegion* r : regs2)
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r->SetCentroid(*p2It++);
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/* Best destination region */
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if (reg) {
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regs2.clear();
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regs2.push_back(reg);
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/* Retrace parents to find best source region */
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while (CPFRegion* p = reg->Data()->GetParent())
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reg = p;
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regs1.clear();
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regs1.push_back(reg);
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}
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return reg != nullptr;
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}
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void CPathFindVisualizer::Draw(const CPathFindSearch& path) {
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m_spline.Reset();
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for (const auto& wp : path.GetWaypoints())
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m_spline.AddVertex(wp, zeus::CColor::skBlue, 2.f);
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m_spline.Render();
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}
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void CPathFindSearch::DebugDraw() const {
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if (!m_viz)
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m_viz.emplace();
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m_viz->Draw(*this);
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}
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} // namespace urde
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