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#include "critter.hpp"
#include "src/anim-atlas.hpp"
#include "loader/loader.hpp"
#include "src/world.hpp"
#include "src/object.hpp"
#include "shaders/shader.hpp"
#include "compat/exception.hpp"
#include <cmath>
#include <utility>
#include <algorithm>
#include <Magnum/Math/Functions.h>
namespace floormat {
namespace {
constexpr double framerate = 96 * 3, move_speed = Vector2d(TILE_SIZE2).length() * 4.25;
constexpr double frame_time = 1/framerate;
constexpr auto arrows_to_dir(bool left, bool right, bool up, bool down)
{
if (left == right)
left = right = false;
if (up == down)
up = down = false;
const auto bits = unsigned(left << 3 | right << 2 | up << 1 | down << 0);
constexpr unsigned L = 1 << 3, R = 1 << 2, U = 1 << 1, D = 1 << 0;
CORRADE_ASSUME(bits <= 0xff);
switch (bits)
{
using enum rotation;
case 0: return rotation{rotation_COUNT};
case L | U: return W;
case L | D: return S;
case R | U: return N;
case R | D: return E;
case L: return SW;
case D: return SE;
case R: return NE;
case U: return NW;
default: std::unreachable();
}
}
constexpr Vector2i rotation_to_vec(rotation r)
{
CORRADE_ASSUME(r < rotation_COUNT);
switch (r)
{
using enum rotation;
case N: return { 0, -1 };
case NE: return { 1, -1 };
case E: return { 1, 0 };
case SE: return { 1, 1 };
case S: return { 0, 1 };
case SW: return { -1, 1 };
case W: return { -1, 0 };
case NW: return { -1, -1 };
default: std::unreachable();
}
}
constexpr std::array<rotation, 3> rotation_to_similar(rotation r)
{
CORRADE_ASSUME(r < rotation_COUNT);
switch (r)
{
using enum rotation;
case N: return { N, NW, NE };
case NE: return { NE, N, E };
case E: return { E, NE, SE };
case SE: return { SE, E, S };
case S: return { S, SE, SW };
case SW: return { SW, S, W };
case W: return { W, SW, NW };
case NW: return { NW, W, N };
}
std::unreachable();
}
} // namespace
critter_proto::critter_proto(const critter_proto&) = default;
critter_proto::~critter_proto() noexcept = default;
critter_proto& critter_proto::operator=(const critter_proto&) = default;
critter_proto::critter_proto()
{
type = object_type::critter;
atlas = loader.anim_atlas("npc-walk", loader.ANIM_PATH);
}
bool critter_proto::operator==(const object_proto& e0) const
{
if (type != e0.type)
return false;
if (!object_proto::operator==(e0))
return false;
const auto& s0 = static_cast<const critter_proto&>(e0);
return name == s0.name && playable == s0.playable;
}
int critter::allocate_frame_time(float dt)
{
auto d = (double)delta / 65535. + (double)dt;
d = std::min(1., d);
auto ret = (int)(d / frame_time);
d -= ret;
d = std::max(0., d);
delta = (uint16_t)(d * 65535);
return ret;
}
constexpr Vector2 move_vec(Vector2i vec)
{
const int left_right = vec[0], top_bottom = vec[1];
constexpr auto c = (float)move_speed * (float)frame_time;
auto dir = Vector2((float)Math::sign(left_right), (float)Math::sign(top_bottom));
auto inv_norm = 1.f/dir.length();
return c * dir * inv_norm;
}
void critter::set_keys(bool L, bool R, bool U, bool D)
{
b_L = L;
b_R = R;
b_U = U;
b_D = D;
}
float critter::depth_offset() const
{
return tile_shader::character_depth_offset;
}
Vector2 critter::ordinal_offset(Vector2b offset) const
{
(void)offset;
return Vector2(offset);
}
constexpr auto make_move_vec(rotation r)
{
auto [_0, _1, _2] = rotation_to_similar(r);
return std::array<Vector2, 3>{{
move_vec(rotation_to_vec(_0)),
move_vec(rotation_to_vec(_1)),
move_vec(rotation_to_vec(_2)),
}};
}
template<size_t... Index>
constexpr auto make_move_vecs(std::index_sequence<Index...>)
{
return std::array<std::array<Vector2, 3>, (size_t)rotation_COUNT>{{
make_move_vec((rotation)Index)...,
}};
}
void critter::update(size_t i, float dt)
{
const auto new_r = arrows_to_dir(b_L, b_R, b_U, b_D);
if (new_r == rotation_COUNT)
{
offset_frac = {};
delta = 0;
return;
}
int nframes = allocate_frame_time(dt);
if (nframes == 0)
return;
constexpr auto move_vecs_ = make_move_vecs(std::make_index_sequence<(size_t)rotation_COUNT>{});
const auto& move_vecs = move_vecs_[(size_t)r];
if (r != new_r)
if (is_dynamic())
rotate(i, new_r);
c->ensure_passability();
for (int k = 0; k < nframes; k++)
{
for (auto j = 0uz; j < 3; j++)
{
auto vec = move_vecs[j];
constexpr auto frac = 65535u;
constexpr auto inv_frac = 1.f / (float)frac;
const auto sign_vec = Vector2(Math::sign(vec[0]), Math::sign(vec[1]));
auto offset_ = vec + Vector2(offset_frac) * sign_vec * inv_frac;
offset_frac = Vector2us(Vector2(std::fabs(std::fmod(offset_[0], 1.f)), std::fabs(std::fmod(offset_[1], 1.f))) * frac);
auto off_i = Vector2i(offset_);
if (!off_i.isZero())
{
if (can_move_to(off_i))
{
move_to(i, off_i, new_r);
++frame %= atlas->info().nframes;
goto done;
}
else
{
offset_frac = {};
delta = 0;
return;
}
}
}
delta = 0;
break;
done:
(void)0;
}
}
object_type critter::type() const noexcept { return object_type::critter; }
critter::operator critter_proto() const
{
critter_proto ret;
static_cast<object_proto&>(ret) = object::operator object_proto();
ret.name = name;
ret.playable = playable;
return ret;
}
critter::critter(object_id id, struct chunk& c, const critter_proto& proto) :
object{id, c, proto},
name{proto.name},
playable{proto.playable}
{
if (!name)
name = "(Unnamed)"_s;
fm_soft_assert(atlas->check_rotation(r));
object::set_bbox_(offset, bbox_offset, Vector2ub(iTILE_SIZE2/2), pass);
}
} // namespace floormat
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