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#include "chunk-scenery.hpp"
#include "tile-constants.hpp"
#include "shaders/shader.hpp"
#include "object.hpp"
#include "anim-atlas.hpp"
#include "scenery.hpp"
#include "quads.hpp"
#include <bit>
#include <Corrade/Containers/ArrayView.h>
#include <Magnum/GL/Buffer.h>
namespace floormat {
using namespace floormat::Quads;
using topo_sort_data = chunk::topo_sort_data;
namespace {
auto make_topo_sort_data(object& e, uint32_t mesh_idx) -> topo_sort_data
{
const auto& a = *e.atlas;
const auto& f = a.frame(e.r, e.frame);
const auto world_pos = TILE_SIZE20 * Vector3(e.coord.local()) + Vector3(Vector2(e.offset) + Vector2(e.bbox_offset), 0);
const auto pos = tile_shader::project(world_pos);
const auto px_start = pos - Vector2(e.bbox_offset) - Vector2(f.ground), px_end = px_start + Vector2(f.size);
topo_sort_data data = {
.in = &e,
.min = Vector2i(px_start),
.max = Vector2i(px_end),
.center = Vector2i(pos),
.in_mesh_idx = mesh_idx,
.ord = e.ordinal(),
};
if (e.type() == object_type::scenery && !e.is_dynamic())
{
const auto bb_min_ = world_pos - Vector3(Vector2(e.bbox_size/2), 0);
const auto bb_max_ = bb_min_ + Vector3(Vector2(e.bbox_size), 0);
const auto& sc = static_cast<scenery&>(e);
switch (e.r)
{
using enum rotation;
default:
break;
case N:
case S:
case W:
case E:
const auto bb_min = tile_shader::project(Vector3(Vector2(bb_min_[0], bb_max_[1]), 0));
const auto bb_max = tile_shader::project(Vector3(Vector2(bb_max_[0], bb_min_[1]), 0));
const auto bb_len = bb_max[0] - bb_min[0];
if (bb_len >= 1 && f.size[0] > (unsigned)iTILE_SIZE[0])
{
data.slope = (bb_max[1]-bb_min[1])/bb_len;
data.bb_min = Vector2s(bb_min - px_start);
data.bb_max = Vector2s(bb_max - px_start);
if (sc.scenery_type() != scenery_type::door)
data.mode = topo_sort_data::mode_static;
}
break;
}
}
else if (e.type() == object_type::critter)
data.mode = topo_sort_data::mode_character;
return data;
}
void topo_dfs(Array<chunk::object_draw_order>& array, size_t& output, size_t i, size_t size) // NOLINT(misc-no-recursion)
{
using m = typename chunk::topo_sort_data::m;
if (array[i].data.visited)
return;
array[i].data.visited = true;
const auto& data_i = array[i].data;
for (auto j = 0u; j < size; j++)
{
if (i == j)
continue;
const auto& data_j = array[j].data;
if (data_j.visited)
continue;
if (data_j.mode == m::mode_static && data_i.mode == m::mode_character)
{
if (!data_i.intersects(data_j))
continue;
const auto &c = data_i, &s = data_j;
auto off = c.center.x() - s.center.x();
auto y = s.center.y() + s.slope * off;
if (y < c.center.y())
topo_dfs(array, output, j, size);
}
else if (data_i.mode == m::mode_static && data_j.mode == m::mode_character)
{
if (!data_i.intersects(data_j))
continue;
const auto &c = data_j, &s = data_i;
auto off = c.center.x() - s.center.x();
auto y = s.center.y() + s.slope * off;
if (y >= c.center.y())
topo_dfs(array, output, j, size);
}
else if (data_i.ord > data_j.ord)
topo_dfs(array, output, j, size);
}
fm_assert(output < size);
array[output].e = data_i.in;
array[output].mesh_idx = data_i.in_mesh_idx;
output++;
}
void topological_sort(Array<chunk::object_draw_order>& array, size_t size)
{
size_t output = 0;
for (auto i = 0u; i < size; i++)
if (!array[i].data.visited)
topo_dfs(array, output, i, size);
fm_assert(output == size);
}
} // namespace
auto chunk::ensure_scenery_mesh() noexcept -> scenery_mesh_tuple
{
Array<object_draw_order> array;
Array<std::array<vertex, 4>> scenery_vertexes;
Array<std::array<UnsignedShort, 6>> scenery_indexes;
return ensure_scenery_mesh({array, scenery_vertexes, scenery_indexes});
}
bool chunk::topo_sort_data::intersects(const topo_sort_data& o) const
{
return min.x() <= o.max.x() && max.x() >= o.min.x() &&
min.y() <= o.max.y() && max.y() >= o.min.y();
}
auto chunk::ensure_scenery_mesh(scenery_scratch_buffers buffers) noexcept -> scenery_mesh_tuple
{
ensure_scenery_buffers(buffers);
fm_assert(_objects_sorted);
if (_scenery_modified)
{
_scenery_modified = false;
const auto count = [this] {
uint32_t ret = 0;
for (const auto& e : _objects)
ret += !e->is_dynamic();
return ret;
}();
auto& scenery_vertexes = buffers.scenery_vertexes;
auto& scenery_indexes = buffers.scenery_indexes;
for (auto i = 0u; const auto& e : _objects)
{
if (e->is_dynamic())
continue;
const auto& atlas = e->atlas;
fm_debug_assert(atlas != nullptr);
const auto& fr = *e;
const auto pos = e->coord.local();
const auto coord = Vector3(pos) * TILE_SIZE + Vector3(Vector2(fr.offset), 0);
const auto quad = atlas->frame_quad(coord, fr.r, fr.frame);
const auto& group = atlas->group(fr.r);
const auto texcoords = atlas->texcoords_for_frame(fr.r, fr.frame, !group.mirror_from.isEmpty());
const auto d = e->depth_offset();
const float depth = tile_shader::depth_value(pos, d);
for (auto j = 0u; j < 4; j++)
scenery_vertexes[i][j] = { quad[j], texcoords[j], depth };
scenery_indexes[i] = quad_indexes(i);
i++;
}
GL::Mesh mesh{GL::MeshPrimitive::Triangles};
auto vert_view = ArrayView<const std::array<vertex, 4>>{scenery_vertexes, count};
auto index_view = ArrayView<const std::array<UnsignedShort, 6>>{scenery_indexes, count};
mesh.addVertexBuffer(GL::Buffer{vert_view}, 0, tile_shader::Position{}, tile_shader::TextureCoordinates{}, tile_shader::Depth{})
.setIndexBuffer(GL::Buffer{index_view}, 0, GL::MeshIndexType::UnsignedShort)
.setCount(int32_t(6 * count));
scenery_mesh = move(mesh);
}
const auto size = _objects.size();
auto& array = buffers.array;
uint32_t j = 0, i = 0;
for (const auto& e : _objects)
{
auto index = e->is_dynamic() ? (uint32_t)-1 : j++;
array[i++] = { e.get(), (uint32_t)-1, e->ordinal(), make_topo_sort_data(*e, index) };
}
topological_sort(array, i);
return { scenery_mesh, ArrayView<object_draw_order>{array, size}, j };
}
void chunk::ensure_scenery_buffers(scenery_scratch_buffers bufs)
{
const size_t lenʹ = _objects.size();
if (lenʹ <= bufs.array.size())
return;
size_t len;
if (lenʹ > 1 << 20)
len = lenʹ;
else
len = std::bit_ceil(lenʹ);
bufs.array = Array<object_draw_order>{NoInit, len};
bufs.scenery_vertexes = Array<std::array<vertex, 4>>{NoInit, len};
bufs.scenery_indexes = Array<std::array<UnsignedShort, 6>>{NoInit, len};
}
} // namespace floormat
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