metaforce/Runtime/Collision/COBBTree.cpp

#include "COBBTree.hpp"
#include "CCollidableOBBTreeGroup.hpp"

namespace urde {
/* This is exactly what retro did >.< */
u32 verify_deaf_babe(CInputStream& in) { return in.readUint32Big(); }

/* This is exactly what retro did >.< */
u32 verify_version(CInputStream& in) { return in.readUint32Big(); }

COBBTree::COBBTree(const SIndexData& indexData, const CNode* root) : x18_indexData(indexData), x88_root((CNode*)root) {}

COBBTree::COBBTree(CInputStream& in)
: x0_magic(verify_deaf_babe(in))
, x4_version(verify_version(in))
, x8_memsize(in.readUint32())
, x18_indexData(in)
, x88_root(new CNode(in)) {}

std::unique_ptr<CCollidableOBBTreeGroupContainer> COBBTree::BuildOrientedBoundingBoxTree(const zeus::CVector3f& a,
                                                                                         const zeus::CVector3f& b) {
  return std::make_unique<CCollidableOBBTreeGroupContainer>(a, b);
}

CCollisionSurface COBBTree::GetSurface(u16 idx) const {
  int surfIdx = idx * 3;
  CCollisionEdge e0 = x18_indexData.x40_edges[x18_indexData.x50_surfaceIndices[surfIdx]];
  CCollisionEdge e1 = x18_indexData.x40_edges[x18_indexData.x50_surfaceIndices[surfIdx + 1]];
  u16 vert1 = e0.GetVertIndex1();
  u16 vert2 = e0.GetVertIndex2();
  u16 vert3 = e1.GetVertIndex1();

  if (vert3 == vert1 || vert3 == vert2)
    vert3 = e1.GetVertIndex2();

  u32 mat = x18_indexData.x0_materials[x18_indexData.x30_surfaceMaterials[idx]];

  if ((mat & 0x2000000) != 0) {
    return CCollisionSurface(x18_indexData.x60_vertices[vert2], x18_indexData.x60_vertices[vert1],
                             x18_indexData.x60_vertices[vert3], mat);
  }
  return CCollisionSurface(x18_indexData.x60_vertices[vert1], x18_indexData.x60_vertices[vert2],
                           x18_indexData.x60_vertices[vert3], mat);
}

void COBBTree::GetTriangleVertexIndices(u16 idx, u16 indicesOut[3]) const {
  const CCollisionEdge& e0 = x18_indexData.x40_edges[x18_indexData.x50_surfaceIndices[idx * 3]];
  const CCollisionEdge& e1 = x18_indexData.x40_edges[x18_indexData.x50_surfaceIndices[idx * 3 + 1]];
  indicesOut[2] = (e1.GetVertIndex1() != e0.GetVertIndex1() && e1.GetVertIndex1() != e0.GetVertIndex2())
                      ? e1.GetVertIndex1()
                      : e1.GetVertIndex2();

  u32 material = x18_indexData.x0_materials[x18_indexData.x30_surfaceMaterials[idx]];
  if (material & 0x2000000) {
    indicesOut[0] = e0.GetVertIndex2();
    indicesOut[1] = e0.GetVertIndex1();
  } else {
    indicesOut[0] = e0.GetVertIndex1();
    indicesOut[1] = e0.GetVertIndex2();
  }
}

CCollisionSurface COBBTree::GetTransformedSurface(u16 idx, const zeus::CTransform& xf) const {
  int surfIdx = idx * 3;
  CCollisionEdge e0 = x18_indexData.x40_edges[x18_indexData.x50_surfaceIndices[surfIdx]];
  CCollisionEdge e1 = x18_indexData.x40_edges[x18_indexData.x50_surfaceIndices[surfIdx + 1]];
  u16 vert1 = e0.GetVertIndex1();
  u16 vert2 = e0.GetVertIndex2();
  u16 vert3 = e1.GetVertIndex1();

  if (vert3 == vert1 || vert3 == vert2)
    vert3 = e1.GetVertIndex2();

  u32 mat = x18_indexData.x0_materials[x18_indexData.x30_surfaceMaterials[idx]];

  if ((mat & 0x2000000) != 0) {
    return CCollisionSurface(xf * x18_indexData.x60_vertices[vert2], xf * x18_indexData.x60_vertices[vert1],
                             xf * x18_indexData.x60_vertices[vert3], mat);
  }
  return CCollisionSurface(xf * x18_indexData.x60_vertices[vert1], xf * x18_indexData.x60_vertices[vert2],
                           xf * x18_indexData.x60_vertices[vert3], mat);
}

zeus::CAABox COBBTree::CalculateLocalAABox() const { return CalculateAABox(zeus::CTransform::Identity()); }

zeus::CAABox COBBTree::CalculateAABox(const zeus::CTransform& xf) const {
  if (x88_root)
    return x88_root->GetOBB().calculateAABox(xf);
  return zeus::CAABox::skInvertedBox;
}

COBBTree::SIndexData::SIndexData(CInputStream& in) {
  u32 count = in.readUint32Big();
  x0_materials.reserve(count);
  for (u32 i = 0; i < count; i++)
    x0_materials.push_back(in.readUint32Big());

  count = in.readUint32Big();
  for (u32 i = 0; i < count; i++)
    x10_vertMaterials.push_back(in.readUByte());
  count = in.readUint32Big();
  for (u32 i = 0; i < count; i++)
    x20_edgeMaterials.push_back(in.readUByte());
  count = in.readUint32Big();
  for (u32 i = 0; i < count; i++)
    x30_surfaceMaterials.push_back(in.readUByte());

  count = in.readUint32Big();
  for (u32 i = 0; i < count; i++)
    x40_edges.push_back(in);

  count = in.readUint32Big();
  for (u32 i = 0; i < count; i++)
    x50_surfaceIndices.push_back(in.readUint16Big());

  count = in.readUint32Big();
  for (u32 i = 0; i < count; i++)
    x60_vertices.push_back(zeus::CVector3f::ReadBig(in));
}

COBBTree::CNode::CNode(const zeus::CTransform& xf, const zeus::CVector3f& point, const COBBTree::CNode* left,
                       const COBBTree::CNode* right, const COBBTree::CLeafData* leaf)
: x0_obb(xf, point), x3c_isLeaf(leaf != nullptr) {
  x40_left.reset((CNode*)left);
  x44_right.reset((CNode*)right);
  x48_leaf.reset((CLeafData*)leaf);
}

COBBTree::CNode::CNode(CInputStream& in) {
  x0_obb = zeus::COBBox::ReadBig(in);
  x3c_isLeaf = in.readBool();
  if (x3c_isLeaf)
    x48_leaf.reset(new CLeafData(in));
  else {
    x40_left.reset(new CNode(in));
    x44_right.reset(new CNode(in));
  }
}

size_t COBBTree::CNode::GetMemoryUsage() const {
  size_t ret = 0;
  if (x3c_isLeaf)
    ret = x48_leaf->GetMemoryUsage() + /*sizeof(CNode)*/ 80;
  else {
    if (x40_left)
      ret = x40_left->GetMemoryUsage() + /*sizeof(CNode)*/ 80;
    if (x44_right)
      ret += x44_right->GetMemoryUsage();
  }

  return (ret + 3) & ~3;
}

COBBTree::CLeafData::CLeafData(const std::vector<u16>& surface) : x0_surface(surface) {}

const std::vector<u16>& COBBTree::CLeafData::GetSurfaceVector() const { return x0_surface; }

size_t COBBTree::CLeafData::GetMemoryUsage() const {
  size_t ret = (x0_surface.size() * 2) + /*sizeof(CLeafData)*/ 16;
  return (ret + 3) & ~3;
}

COBBTree::CLeafData::CLeafData(CInputStream& in) {
  u32 edgeCount = in.readUint32Big();
  for (u32 i = 0; i < edgeCount; i++)
    x0_surface.push_back(in.readUint16Big());
}

} // namespace urde