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pandemonium_engine/modules/network_synchronizer/interpolator.cpp

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/*************************************************************************/
/* interpolator.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
/**
@author AndreaCatania
*/
// TODO write unit tests to make sure all cases are covered.
#include "interpolator.h"
#include "core/ustring.h"
void Interpolator::_bind_methods() {
ClassDB::bind_method(D_METHOD("register_variable", "default", "fallback"), &Interpolator::register_variable);
ClassDB::bind_method(D_METHOD("set_variable_default", "var_id", "default"), &Interpolator::set_variable_default);
ClassDB::bind_method(D_METHOD("set_variable_custom_interpolator", "var_id", "object", "function_name"), &Interpolator::set_variable_custom_interpolator);
ClassDB::bind_method(D_METHOD("epoch_insert", "var_id", "value"), &Interpolator::epoch_insert);
ClassDB::bind_method(D_METHOD("pop_epoch", "epoch"), &Interpolator::pop_epoch);
ClassDB::bind_method(D_METHOD("get_last_pop_epoch"), &Interpolator::get_last_pop_epoch);
// TODO used to do the tests.
//ClassDB::bind_method(D_METHOD("terminate_init"), &Interpolator::terminate_init);
//ClassDB::bind_method(D_METHOD("begin_write", "epoch"), &Interpolator::begin_write);
//ClassDB::bind_method(D_METHOD("end_write"), &Interpolator::end_write);
BIND_ENUM_CONSTANT(FALLBACK_INTERPOLATE);
BIND_ENUM_CONSTANT(FALLBACK_DEFAULT);
BIND_ENUM_CONSTANT(FALLBACK_NEW_OR_NEAREST);
BIND_ENUM_CONSTANT(FALLBACK_OLD_OR_NEAREST);
}
void Interpolator::clear() {
epochs.clear();
buffer.clear();
write_position = UINT32_MAX;
}
void Interpolator::reset() {
variables.clear();
epochs.clear();
buffer.clear();
init_phase = true;
write_position = UINT32_MAX;
last_pop_epoch = 0;
}
int Interpolator::register_variable(const Variant &p_default, Fallback p_fallback) {
ERR_FAIL_COND_V_MSG(init_phase == false, -1, "You cannot add another variable at this point.");
const uint32_t id = variables.size();
variables.push_back(VariableInfo{ p_default, p_fallback, ObjectID(), StringName() });
return id;
}
void Interpolator::set_variable_default(int p_var_id, const Variant &p_default) {
ERR_FAIL_INDEX(p_var_id, int(variables.size()));
ERR_FAIL_COND(variables[p_var_id].default_value.get_type() != p_default.get_type());
variables[p_var_id].default_value = p_default;
}
void Interpolator::set_variable_custom_interpolator(int p_var_id, Object *p_object, const StringName &p_function_name) {
ERR_FAIL_COND_MSG(init_phase == false, "You cannot add another variable at this point.");
ERR_FAIL_INDEX_MSG(p_var_id, int(variables.size()), "The variable_id passed is unknown.");
variables[p_var_id].fallback = FALLBACK_CUSTOM_INTERPOLATOR;
variables[p_var_id].custom_interpolator_object = p_object->get_instance_id();
variables[p_var_id].custom_interpolator_function = p_function_name;
}
void Interpolator::terminate_init() {
init_phase = false;
}
uint32_t Interpolator::known_epochs_count() const {
return epochs.size();
}
void Interpolator::begin_write(uint32_t p_epoch) {
ERR_FAIL_COND_MSG(write_position != UINT32_MAX, "You can't call this function twice.");
ERR_FAIL_COND_MSG(init_phase, "You cannot write data while the buffer is not fully initialized, call `terminate_init`.");
// Make room for this epoch.
// Insert the epoch sorted in the buffer.
write_position = UINT32_MAX;
for (uint32_t i = 0; i < epochs.size(); i += 1) {
if (epochs[i] >= p_epoch) {
write_position = i;
break;
}
}
if (write_position < UINT32_MAX) {
if (epochs[write_position] == p_epoch) {
// This epoch already exists, nothing to do.
return;
} else {
// Make room.
epochs.push_back(UINT32_MAX);
buffer.push_back(Vector<Variant>());
// Sort the epochs.
for (int i = epochs.size() - 2; i >= int(write_position); i -= 1) {
epochs[uint32_t(i) + 1] = epochs[uint32_t(i)];
buffer[uint32_t(i) + 1] = buffer[uint32_t(i)];
}
// Init the new epoch.
epochs[write_position] = p_epoch;
buffer[write_position].clear();
buffer[write_position].resize(variables.size());
}
} else {
// No sort needed.
write_position = epochs.size();
epochs.push_back(p_epoch);
buffer.push_back(Vector<Variant>());
buffer[write_position].resize(variables.size());
}
// Set defaults.
Variant *ptr = buffer[write_position].ptrw();
for (uint32_t i = 0; i < variables.size(); i += 1) {
ptr[i] = variables[i].default_value;
}
}
void Interpolator::epoch_insert(int p_var_id, const Variant &p_value) {
ERR_FAIL_COND_MSG(write_position == UINT32_MAX, "Please call `begin_write` before.");
ERR_FAIL_INDEX_MSG(p_var_id, int(variables.size()), "The variable_id passed is unknown.");
const uint32_t var_id(p_var_id);
ERR_FAIL_COND_MSG(variables[var_id].default_value.get_type() != p_value.get_type(), "The variable: " + itos(p_var_id) + " expects the variable type: " + Variant::get_type_name(variables[var_id].default_value.get_type()) + ", and not: " + Variant::get_type_name(p_value.get_type()));
buffer[write_position].write[var_id] = p_value;
}
void Interpolator::end_write() {
ERR_FAIL_COND_MSG(write_position == UINT32_MAX, "You can't call this function before starting the epoch with `begin_write`.");
write_position = UINT32_MAX;
}
Vector<Variant> Interpolator::pop_epoch(uint32_t p_epoch, real_t p_fraction) {
ERR_FAIL_COND_V_MSG(init_phase, Vector<Variant>(), "You can't pop data if the interpolator is not fully initialized.");
ERR_FAIL_COND_V_MSG(write_position != UINT32_MAX, Vector<Variant>(), "You can't pop data while writing the epoch");
double epoch = double(p_epoch) + double(p_fraction);
// Search the epoch.
uint32_t position = UINT32_MAX;
for (uint32_t i = 0; i < epochs.size(); i += 1) {
if (static_cast<double>(epochs[i]) >= epoch) {
position = i;
break;
}
}
ObjectID cache_object_id = 0;
Object *cache_object = nullptr;
Vector<Variant> data;
if (unlikely(position == UINT32_MAX)) {
data.resize(variables.size());
Variant *ptr = data.ptrw();
if (buffer.size() == 0) {
// No data found, set all to default.
for (uint32_t i = 0; i < variables.size(); i += 1) {
ptr[i] = variables[i].default_value;
}
} else {
// No new data.
for (uint32_t i = 0; i < variables.size(); i += 1) {
switch (variables[i].fallback) {
case FALLBACK_DEFAULT:
ptr[i] = variables[i].default_value;
break;
case FALLBACK_INTERPOLATE: // No way to interpolate, so just send the nearest.
case FALLBACK_NEW_OR_NEAREST: // No new data, so send the nearest.
case FALLBACK_OLD_OR_NEAREST: // Just send the oldest, as desired.
ptr[i] = buffer[buffer.size() - 1][i];
break;
case FALLBACK_CUSTOM_INTERPOLATOR:
ptr[i] = variables[i].default_value;
if (cache_object_id != variables[i].custom_interpolator_object) {
ERR_CONTINUE_MSG(!variables[i].custom_interpolator_object, "The variable: " + itos(i) + " has a custom interpolator, but the function is invalid.");
Object *o = ObjectDB::get_instance(variables[i].custom_interpolator_object);
ERR_CONTINUE_MSG(o == nullptr, "The variable: " + itos(i) + " has a custom interpolator, but the function is invalid.");
cache_object_id = variables[i].custom_interpolator_object;
cache_object = o;
}
ptr[i] = cache_object->call(
variables[i].custom_interpolator_function,
epochs[buffer.size() - 1],
buffer[buffer.size() - 1][i],
-1,
variables[i].default_value,
0.0);
if (ptr[i].get_type() != variables[i].default_value.get_type()) {
ERR_PRINT("The variable: " + itos(i) + " custom interpolator [" + variables[i].custom_interpolator_function + "], returned a different variant type. Expected: " + Variant::get_type_name(variables[i].default_value.get_type()) + ", returned: " + Variant::get_type_name(ptr[i].get_type()));
ptr[i] = variables[i].default_value;
}
break;
}
}
}
} else if (unlikely(ABS(epochs[position] - epoch) <= CMP_EPSILON)) {
// Precise data.
data = buffer[position];
} else if (unlikely(position == 0)) {
// No old data.
data.resize(variables.size());
Variant *ptr = data.ptrw();
for (uint32_t i = 0; i < variables.size(); i += 1) {
switch (variables[i].fallback) {
case FALLBACK_DEFAULT:
ptr[i] = variables[i].default_value;
break;
case FALLBACK_INTERPOLATE: // No way to interpolate, so just send the nearest.
case FALLBACK_NEW_OR_NEAREST: // Just send the newer data as desired.
case FALLBACK_OLD_OR_NEAREST: // No old data, so send nearest.
ptr[i] = buffer[0][i];
break;
case FALLBACK_CUSTOM_INTERPOLATOR:
ptr[i] = variables[i].default_value;
if (cache_object_id != variables[i].custom_interpolator_object) {
ERR_CONTINUE_MSG(!variables[i].custom_interpolator_object, "The variable: " + itos(i) + " has a custom interpolator, but the function is invalid.");
Object *o = ObjectDB::get_instance(variables[i].custom_interpolator_object);
ERR_CONTINUE_MSG(o == nullptr, "The variable: " + itos(i) + " has a custom interpolator, but the function is invalid.");
cache_object_id = variables[i].custom_interpolator_object;
cache_object = o;
}
ptr[i] = cache_object->call(
variables[i].custom_interpolator_function,
-1,
variables[i].default_value,
epochs[0],
buffer[0][i],
1.0);
if (ptr[i].get_type() != variables[i].default_value.get_type()) {
ERR_PRINT("The variable: " + itos(i) + " custom interpolator [" + variables[i].custom_interpolator_function + "], returned a different variant type. Expected: " + Variant::get_type_name(variables[i].default_value.get_type()) + ", returned: " + Variant::get_type_name(ptr[i].get_type()));
ptr[i] = variables[i].default_value;
}
break;
}
}
} else {
// Enought data to do anything needed.
data.resize(variables.size());
Variant *ptr = data.ptrw();
for (uint32_t i = 0; i < variables.size(); i += 1) {
switch (variables[i].fallback) {
case FALLBACK_DEFAULT:
ptr[i] = variables[i].default_value;
break;
case FALLBACK_INTERPOLATE: {
const real_t delta = (epoch - double(epochs[position - 1])) / double(epochs[position] - epochs[position - 1]);
ptr[i] = interpolate(
buffer[position - 1][i],
buffer[position][i],
delta);
} break;
case FALLBACK_NEW_OR_NEAREST:
ptr[i] = buffer[position][i];
break;
case FALLBACK_OLD_OR_NEAREST:
ptr[i] = buffer[position - 1][i];
break;
case FALLBACK_CUSTOM_INTERPOLATOR: {
ptr[i] = variables[i].default_value;
if (cache_object_id != variables[i].custom_interpolator_object) {
ERR_CONTINUE_MSG(!variables[i].custom_interpolator_object, "The variable: " + itos(i) + " has a custom interpolator, but the function is invalid.");
Object *o = ObjectDB::get_instance(variables[i].custom_interpolator_object);
ERR_CONTINUE_MSG(o == nullptr, "The variable: " + itos(i) + " has a custom interpolator, but the function is invalid.");
cache_object_id = variables[i].custom_interpolator_object;
cache_object = o;
}
const real_t delta = (epoch - double(epochs[position - 1])) / double(epochs[position] - epochs[position - 1]);
ptr[i] = cache_object->call(
variables[i].custom_interpolator_function,
epochs[position - 1],
buffer[position - 1][i],
epochs[position],
buffer[position][i],
delta);
if (ptr[i].get_type() != variables[i].default_value.get_type()) {
ERR_PRINT("The variable: " + itos(i) + " custom interpolator [" + variables[i].custom_interpolator_function + "], returned a different variant type. Expected: " + Variant::get_type_name(variables[i].default_value.get_type()) + ", returned: " + Variant::get_type_name(ptr[i].get_type()));
ptr[i] = variables[i].default_value;
}
} break;
}
}
}
if (unlikely(position == UINT32_MAX)) {
if (buffer.size() > 1) {
// Remove all the elements but last. This happens when the p_epoch is
// bigger than the one already stored into the queue.
epochs[0] = epochs[buffer.size() - 1];
buffer[0] = buffer[buffer.size() - 1];
epochs.resize(1);
buffer.resize(1);
}
} else if (position >= 2) {
// TODO improve this by performing first the shifting then the resizing.
// Remove the old elements, but leave the one used to interpolate.
for (uint32_t i = 0; i < position - 1; i += 1) {
epochs.remove(0);
buffer.remove(0);
}
}
// TODO this is no more valid since I'm using the fractional part.
last_pop_epoch = MAX(p_epoch, last_pop_epoch);
return data;
}
uint32_t Interpolator::get_last_pop_epoch() const {
return last_pop_epoch;
}
uint32_t Interpolator::get_youngest_epoch() const {
if (epochs.size() <= 0) {
return UINT32_MAX;
}
return epochs[0];
}
uint32_t Interpolator::get_oldest_epoch() const {
if (epochs.size() <= 0) {
return UINT32_MAX;
}
return epochs[epochs.size() - 1];
}
uint32_t Interpolator::epochs_between_last_time_window() const {
if (epochs.size() <= 1) {
return 0;
}
return epochs[epochs.size() - 1] - epochs[epochs.size() - 2];
}
Variant Interpolator::interpolate(const Variant &p_v1, const Variant &p_v2, real_t p_delta) {
ERR_FAIL_COND_V(p_v1.get_type() != p_v2.get_type(), p_v1);
switch (p_v1.get_type()) {
case Variant::Type::INT:
return int(Math::round(Math::lerp(p_v1.operator real_t(), p_v2.operator real_t(), p_delta)));
case Variant::Type::REAL:
return Math::lerp(p_v1, p_v2, p_delta);
case Variant::Type::VECTOR2:
return p_v1.operator Vector2().linear_interpolate(p_v2.operator Vector2(), p_delta);
case Variant::Type::VECTOR2I:
return Vector2i(
int(Math::round(Math::lerp(p_v1.operator Vector2i()[0], p_v2.operator Vector2i()[0], p_delta))),
int(Math::round(Math::lerp(p_v1.operator Vector2i()[1], p_v2.operator Vector2i()[1], p_delta))));
case Variant::Type::TRANSFORM2D:
return p_v1.operator Transform2D().interpolate_with(p_v2.operator Transform2D(), p_delta);
case Variant::Type::VECTOR3:
return p_v1.operator Vector3().linear_interpolate(p_v2.operator Vector3(), p_delta);
case Variant::Type::VECTOR3I:
return Vector3i(
int(Math::round(Math::lerp(p_v1.operator Vector3i()[0], p_v2.operator Vector3i()[0], p_delta))),
int(Math::round(Math::lerp(p_v1.operator Vector3i()[1], p_v2.operator Vector3i()[1], p_delta))),
int(Math::round(Math::lerp(p_v1.operator Vector3i()[2], p_v2.operator Vector3i()[2], p_delta))));
case Variant::Type::QUAT:
return p_v1.operator Quat().slerp(p_v2.operator Quat(), p_delta);
case Variant::Type::BASIS:
return p_v1.operator Basis().slerp(p_v2.operator Basis(), p_delta);
case Variant::Type::TRANSFORM:
return p_v1.operator Transform().interpolate_with(p_v2.operator Transform(), p_delta);
default:
return p_delta > 0.5 ? p_v2 : p_v1;
}
}
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