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#include "app.hpp"
#include "src/tile-constants.hpp"
#include "src/global-coords.hpp"
#include "shaders/shader.hpp"
#include "floormat/main.hpp"
#include "floormat/draw-bounds.hpp"
#include "src/RTree-search.hpp"
#include "src/object.hpp"
#include "src/world.hpp"
#include "src/camera-offset.hpp"
#include "src/timer.hpp"
#include "compat/enum-bitset.hpp"
#include "compat/borrowed-ptr.inl"
#include <bit>
#include <Magnum/Math/Functions.h>
namespace floormat {
void app::do_camera(const Ns& dt, const key_set& cmds, int mods)
{
if (cmds[key_camera_reset])
{
reset_camera_offset();
update_cursor_tile(cursor.pixel);
do_mouse_move(mods);
return;
}
Vector2d dir{};
if (cmds[key_camera_up])
dir += Vector2d{0, -1};
else if (cmds[key_camera_down])
dir += Vector2d{0, 1};
if (cmds[key_camera_left])
dir += Vector2d{-1, 0};
else if (cmds[key_camera_right])
dir += Vector2d{1, 0};
if (dir != Vector2d{})
{
auto& shader = M->shader();
const auto sz = M->window_size();
constexpr double screens_per_second = 0.75;
const double pixels_per_second = sz.length() / screens_per_second;
auto camera_offset = shader.camera_offset();
const auto max_camera_offset = Vector2d(sz * 10);
camera_offset -= dir.normalized() * (double)Time::to_seconds(dt) * pixels_per_second;
camera_offset = Math::clamp(camera_offset, -max_camera_offset, max_camera_offset);
shader.set_camera_offset(camera_offset, shader.depth_offset());
update_cursor_tile(cursor.pixel);
do_mouse_move(mods);
}
}
void app::reset_camera_offset()
{
constexpr Vector3d size = TILE_MAX_DIM20d*dTILE_SIZE*-.5;
constexpr auto projected = tile_shader::project(size);
M->shader().set_camera_offset(projected, 0);
_z_level = 0;
update_cursor_tile(cursor.pixel);
}
object_id app::get_object_colliding_with_cursor()
{
const auto [minx, maxx, miny, maxy] = M->get_draw_bounds();
const auto sz = M->window_size();
auto& world = M->world();
auto& shader = M->shader();
using rtree_type = std::decay_t<decltype(*world[chunk_coords_{}].rtree())>;
using rect_type = rtree_type::Rect;
if (cursor.pixel)
{
auto pos = tile_shader::project(Vector3d{0., 0., -_z_level*dTILE_SIZE[2]});
const auto [tile, subpixelʹ] = M->pixel_to_point(Vector2d{*cursor.pixel} + pos);
const auto curchunk = Vector2(tile.chunk()), curtile = Vector2(tile.local());
const auto subpixel = Vector2(subpixelʹ);
for (int16_t y = miny; y <= maxy; y++)
for (int16_t x = minx; x <= maxx; x++)
{
const chunk_coords_ c_pos{x, y, _z_level};
auto* cʹ = world.at(c_pos);
if (!cʹ)
continue;
auto& c = *cʹ;
c.ensure_passability();
const with_shifted_camera_offset o{shader, c_pos};
if (floormat_main::check_chunk_visible(shader.camera_offset(), sz))
{
constexpr auto chunk_size = TILE_SIZE2 * TILE_MAX_DIM;
auto chunk_dist = (curchunk - Vector2(c_pos.x, c_pos.y))*chunk_size;
auto t0 = chunk_dist + curtile*TILE_SIZE2 + subpixel;
auto t1 = t0+Vector2(1e-4f);
const auto* rtree = c.rtree();
object_id ret = 0;
rtree->Search(t0.data(), t1.data(), [&](uint64_t data, const rect_type& rect) {
[[maybe_unused]] auto x = std::bit_cast<collision_data>(data);
if (x.tag == (uint64_t)collision_type::geometry)
return true;
Vector2 min(rect.m_min[0], rect.m_min[1]), max(rect.m_max[0], rect.m_max[1]);
if (t0 >= min && t0 <= max)
{
if (auto e_ = world.find_object(x.data);
e_ && Vector2ui(e_->bbox_size).product() != 0)
{
ret = x.data;
return false;
}
}
return true;
});
if (ret)
return ret;
}
}
}
return 0;
}
void app::update_cursor_tile(const Optional<Vector2i>& pixel)
{
cursor.pixel = pixel;
// assert_invariant !!cursor.tile == !!cursor.subpixel;
if (pixel)
{
auto [tile, subpixel] = M->pixel_to_point(Vector2d(*pixel), _z_level);
cursor.tile = tile;
cursor.subpixel = subpixel;
}
else
{
cursor.tile = NullOpt;
cursor.subpixel = NullOpt;
}
}
Vector2 app::point_screen_pos(point pt)
{
auto& shader = M->shader();
auto win_size = M->window_size();
auto c3 = pt.chunk3();
with_shifted_camera_offset co{shader, c3};
auto world_pos = TILE_SIZE20 * Vector3(pt.local()) + Vector3(Vector2(pt.offset()), 0);
return Vector2(shader.camera_offset()) + Vector2(win_size)*.5f + shader.project(world_pos);
}
} // namespace floormat
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