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#include "app.hpp"
#include "src/global-coords.hpp"
#include "shaders/shader.hpp"
#include "floormat/main.hpp"
#include "src/RTree-search.hpp"
#include "src/world.hpp"
#include "src/camera-offset.hpp"
#include <algorithm>
namespace floormat {
void app::do_camera(float 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)dt * pixels_per_second;
camera_offset[0] = std::clamp(camera_offset[0], -max_camera_offset[0], max_camera_offset[0]);
camera_offset[1] = std::clamp(camera_offset[1], -max_camera_offset[1], max_camera_offset[1]);
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 = typename rtree_type::Rect;
if (cursor.pixel)
{
auto pos = tile_shader::project(Vector3d{0., 0., -_z_level*dTILE_SIZE[2]});
auto pixel = Vector2d{*cursor.pixel} + pos;
auto coord = M->pixel_to_tile(pixel);
auto tile = global_coords{coord.chunk(), coord.local(), 0};
constexpr auto eps = 1e-6f;
constexpr auto m = TILE_SIZE2 * Vector2(1- eps, 1- eps);
const auto tile_ = Vector2(M->pixel_to_tile_(Vector2d(pixel)));
const auto curchunk = Vector2(tile.chunk()), curtile = Vector2(tile.local());
const auto subpixel_ = Vector2(std::fmod(tile_[0], 1.f), std::fmod(tile_[1], 1.f));
const auto subpixel = m * Vector2(curchunk[0] < 0 ? 1 + subpixel_[0] : subpixel_[0],
curchunk[1] < 0 ? 1 + subpixel_[1] : subpixel_[1]);
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* c_ = world.at(c_pos);
if (!c_)
continue;
auto& c = *c_;
c.ensure_passability();
const with_shifted_camera_offset o{shader, c_pos, {minx, miny}, {maxx, maxy}};
if (floormat_main::check_chunk_visible(shader.camera_offset(), sz))
{
constexpr auto half_tile = TILE_SIZE2/2;
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 - half_tile;
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 coord = M->pixel_to_tile(Vector2d{*pixel});
auto tile = global_coords{coord.chunk(), coord.local(), _z_level};
cursor.tile = tile;
const auto tile_ = Vector2(M->pixel_to_tile_(Vector2d(*pixel)));
const auto curchunk = Vector2(tile.chunk());
const auto subpixel_ = Vector2(std::fmod(tile_.x(), 1.f), std::fmod(tile_.y(), 1.f));
auto subpixel = TILE_SIZE2 * Vector2(curchunk.x() < 0 ? 1 + subpixel_.x() : subpixel_.x(),
curchunk.y() < 0 ? 1 + subpixel_.y() : subpixel_.y());
constexpr auto half_tile = Vector2(iTILE_SIZE2/2);
subpixel -= half_tile;
subpixel.x() = Math::clamp(std::round(subpixel.x()), -half_tile.x(), half_tile.x()-1);
subpixel.y() = Math::clamp(std::round(subpixel.y()), -half_tile.y(), half_tile.y()-1);
cursor.subpixel = Vector2b(subpixel);
}
else
{
cursor.tile = NullOpt;
cursor.subpixel = NullOpt;
}
}
} // namespace floormat
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