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#include "chunk.hpp"
#include "ground-atlas.hpp"
#include "object.hpp"
#include "src/RTree-search.hpp"
#include "src/chunk-scenery.hpp"
#include "src/tile-bbox.hpp"
#include "src/wall-atlas.hpp"
#include <bit>
#include <Corrade/Containers/StructuredBindings.h>
#include <Corrade/Containers/Pair.h>
namespace floormat {
bool collision_data::operator==(const collision_data&) const noexcept = default;
bool chunk::bbox::operator==(const floormat::chunk::bbox& other) const noexcept = default;
chunk::RTree* chunk::rtree() noexcept { ensure_passability(); return &*_rtree; }
namespace {
constexpr collision_data make_id_(collision_type type, pass_mode p, object_id id)
{
return collision_data { (object_id)type, (object_id)p, id };
}
constexpr object_id make_id(collision_type type, pass_mode p, object_id id)
{
return std::bit_cast<object_id>(make_id_(type, p, id));
}
} // namespace
void chunk::ensure_passability() noexcept
{
fm_assert(_objects_sorted); // not strictly necessary
if (!_pass_modified)
return;
_pass_modified = false;
_rtree->RemoveAll();
for (const std::shared_ptr<object>& s : objects())
{
bbox box;
if (_bbox_for_scenery(*s, box))
_add_bbox(box);
}
for (auto i = 0uz; i < TILE_COUNT; i++)
{
if (const auto* atlas = ground_atlas_at(i))
{
auto [min, max] = whole_tile(i);
auto id = make_id(collision_type::geometry, atlas->pass_mode(), i+1);
_rtree->Insert(min.data(), max.data(), id);
}
}
for (auto i = 0uz; i < TILE_COUNT; i++)
{
auto tile = operator[](i);
if (const auto* atlas = tile.wall_north_atlas().get())
{
auto [min, max] = wall_north(i, (float)atlas->info().depth);
auto id = make_id(collision_type::geometry, atlas->info().passability, TILE_COUNT+i+1);
_rtree->Insert(min.data(), max.data(), id);
}
if (const auto* atlas = tile.wall_west_atlas().get())
{
auto [min, max] = wall_west(i, (float)atlas->info().depth);
auto id = make_id(collision_type::geometry, atlas->info().passability, TILE_COUNT*2+i+1);
_rtree->Insert(min.data(), max.data(), id);
}
}
}
bool chunk::_bbox_for_scenery(const object& s, local_coords local, Vector2b offset, Vector2b bbox_offset, Vector2ub bbox_size, bbox& value) noexcept
{
auto [start, end] = scenery_tile(local, offset, bbox_offset, bbox_size);
auto id = make_id_(collision_type::scenery, s.pass, s.id);
value = { .data = id, .start = start, .end = end };
return s.atlas && !Vector2ui(s.bbox_size).isZero();
}
bool chunk::_bbox_for_scenery(const object& s, bbox& value) noexcept
{
return _bbox_for_scenery(s, s.coord.local(), s.offset, s.bbox_offset, s.bbox_size, value);
}
void chunk::_remove_bbox(const bbox& x)
{
auto start = Vector2(x.start), end = Vector2(x.end);
_rtree->Remove(start.data(), end.data(), std::bit_cast<object_id>(x.data));
}
void chunk::_add_bbox(const bbox& x)
{
auto start = Vector2(x.start), end = Vector2(x.end);
_rtree->Insert(start.data(), end.data(), std::bit_cast<object_id>(x.data));
}
void chunk::_replace_bbox(const bbox& x0, const bbox& x1, bool b0, bool b1)
{
if (_pass_modified)
return;
unsigned i = (unsigned)b1 << 1 | (unsigned)!!b0 << 0;
CORRADE_ASSUME(i < 4u); (void)0;
switch (i)
{
case 1 << 1 | 1 << 0:
if (x1 == x0)
return;
_remove_bbox(x0);
[[fallthrough]];
case 1 << 1 | 0 << 0:
_add_bbox(x1);
return;
case 0 << 1 | 1 << 0:
_remove_bbox(x0);
return;
case 0 << 1 | 0 << 0:
return;
default:
break;
}
std::unreachable();
}
bool chunk::can_place_object(const object_proto& proto, local_coords pos)
{
(void)ensure_scenery_mesh();
switch (proto.pass)
{
default:
case pass_mode::blocked:
case pass_mode::see_through:
break;
case pass_mode::pass:
case pass_mode::shoot_through:
return true;
}
if (!proto.bbox_size.x() || proto.bbox_size.y())
return true;
auto bbox_size = Vector2i(proto.bbox_size);
if (bbox_size.x() > 1)
bbox_size.x() -= 1;
if (bbox_size.y() > 1)
bbox_size.y() -= 1;
const auto center = Vector2(pos)*TILE_SIZE2 + Vector2(proto.offset) + Vector2(proto.bbox_offset),
min = center - Vector2(bbox_size)*.5f, max = min + Vector2(bbox_size);
bool ret = true;
_rtree->Search(min.data(), max.data(), [&](uint64_t data, const auto&) {
[[maybe_unused]] auto x = std::bit_cast<collision_data>(data);
if (x.pass == (uint64_t)pass_mode::pass || x.pass == (uint64_t)pass_mode::shoot_through)
return true;
return ret = false;
});
return ret;
}
} // namespace floormat
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