initial

modules/client/src/network/EntityPositionInterpolator.cpp

@@ -0,0 +1,57 @@
+#include "EntityPositionInterpolator.hpp"
+
+#include "world/Transform.hpp"
+#include "InterpolatedProperty.hpp"
+#include "EntityInterpolation.hpp"
+
+#include <spdlog/spdlog.h>
+
+namespace tw::net {
+
+EntityPositionInterpolator::EntityPositionInterpolator(
+    entt::registry* registry, entt::entity player_entity, size_t bufferingIntervalInMillis
+) : m_registry(registry),
+    m_player_entity(player_entity),
+    m_bufferingIntervalInMillis(bufferingIntervalInMillis)
+{
+
+}
+
+void EntityPositionInterpolator::register_entity(entt::entity entity) {
+    m_registry->emplace<EntityPositionInterpolation>(entity, glm::vec3());
+}
+
+void EntityPositionInterpolator::add_position_for_entity(entt::entity entity, glm::vec3 position) {
+    auto* interpolation = m_registry->try_get<EntityPositionInterpolation>(entity);
+    if(interpolation == nullptr) {
+        spdlog::warn("Attempt to add position for non-registered entity {}", (uint32_t)entity);
+        return;
+    }
+
+    interpolation->push(Clock::now(), position);
+}
+
+glm::vec3 EntityPositionInterpolator::get_position_for_entity(entt::entity entity) {
+    auto* interpolation = m_registry->try_get<EntityPositionInterpolation>(entity);
+    if(interpolation == nullptr) {
+        spdlog::warn("Attempt to get position for non-registered entity {}", (uint32_t)entity);
+        return glm::vec3();
+    }
+
+    auto now = Clock::now() - std::chrono::milliseconds(m_bufferingIntervalInMillis);
+
+    auto [from, to, value] = interpolation->get_values_around(now);
+    return glm::mix(from, to, value);
+}
+
+void EntityPositionInterpolator::update() {
+    m_registry->view<EntityPositionInterpolation, Transform>()
+        .each([&](const auto entity, const EntityPositionInterpolation& interpolation, Transform& ts) {
+            auto now = Clock::now() - std::chrono::milliseconds(m_bufferingIntervalInMillis);
+
+            auto [from, to, value] = interpolation.get_values_around(now);
+            ts.set_position(glm::mix(from, to, value));
+        });
+}
+
+}