From da2a96ac10ba865181a0760d1beb45dbeca5cfde Mon Sep 17 00:00:00 2001
From: Ricardo Antunes <me@riscadoa.com>
Date: Tue, 14 Nov 2023 10:52:15 +0000
Subject: [PATCH] feat(platformer): add moving platform

---
 platformer/CMakeLists.txt               |  2 ++
 platformer/assets/scenes/level1.cubos   | 14 +++++++--
 platformer/assets/scenes/platform.cubos |  3 +-
 platformer/src/main.cpp                 |  2 ++
 platformer/src/mover/mover.cpp          | 17 +++++++++++
 platformer/src/mover/mover.hpp          | 19 +++++++++++++
 platformer/src/mover/plugin.cpp         | 38 +++++++++++++++++++++++++
 platformer/src/mover/plugin.hpp         |  8 ++++++
 8 files changed, 100 insertions(+), 3 deletions(-)
 create mode 100644 platformer/src/mover/mover.cpp
 create mode 100644 platformer/src/mover/mover.hpp
 create mode 100644 platformer/src/mover/plugin.cpp
 create mode 100644 platformer/src/mover/plugin.hpp

diff --git a/platformer/CMakeLists.txt b/platformer/CMakeLists.txt
index 3cf6320..99ca9e8 100644
--- a/platformer/CMakeLists.txt
+++ b/platformer/CMakeLists.txt
@@ -18,6 +18,8 @@ add_executable(platformer
     src/offset/offset.cpp
     src/death/plugin.cpp
     src/death/dead.cpp
+    src/mover/plugin.cpp
+    src/mover/mover.cpp
 )
 
 target_link_libraries(platformer tesseratos)
diff --git a/platformer/assets/scenes/level1.cubos b/platformer/assets/scenes/level1.cubos
index 9fd8dc1..efd916f 100644
--- a/platformer/assets/scenes/level1.cubos
+++ b/platformer/assets/scenes/level1.cubos
@@ -25,8 +25,18 @@
             }
         },
         "platform-1.base": {
-            "cubos::engine::Position": {
-                "x": -10
+            "demo::Mover": {
+                "from": {
+                    "x": -10,
+                    "y": -10,
+                    "z": -5
+                },
+                "to": {
+                    "x": -10,
+                    "y": 10,
+                    "z": 5
+                },
+                "duration": 5.0
             }
         },
         "platform-2.base": {
diff --git a/platformer/assets/scenes/platform.cubos b/platformer/assets/scenes/platform.cubos
index ac87a0a..c620262 100644
--- a/platformer/assets/scenes/platform.cubos
+++ b/platformer/assets/scenes/platform.cubos
@@ -16,7 +16,8 @@
                 "y": 0.5,
                 "z": 8
             },
-            "cubos::engine::Collider": {}
+            "cubos::engine::Collider": {},
+            "cubos::engine::PhysicsVelocity": {}
         }
     }
 }
\ No newline at end of file
diff --git a/platformer/src/main.cpp b/platformer/src/main.cpp
index 947a077..a63a209 100644
--- a/platformer/src/main.cpp
+++ b/platformer/src/main.cpp
@@ -18,6 +18,7 @@
 #include "collider_gizmos/plugin.hpp"
 #include "offset/plugin.hpp"
 #include "death/plugin.hpp"
+#include "mover/plugin.hpp"
 
 using cubos::core::ecs::Commands;
 using cubos::core::ecs::Query;
@@ -74,6 +75,7 @@ int main(int argc, char** argv)
     cubos.addPlugin(demo::colliderGizmosPlugin);
     cubos.addPlugin(demo::offsetPlugin);
     cubos.addPlugin(demo::deathPlugin);
+    cubos.addPlugin(demo::moverPlugin);
 
     cubos.startupSystem(settings).tagged("cubos.settings");
     cubos.startupSystem(setup).tagged("cubos.assets").after("cubos.renderer.init");
diff --git a/platformer/src/mover/mover.cpp b/platformer/src/mover/mover.cpp
new file mode 100644
index 0000000..bd58b96
--- /dev/null
+++ b/platformer/src/mover/mover.cpp
@@ -0,0 +1,17 @@
+#include "mover.hpp"
+
+#include <cubos/core/ecs/component/reflection.hpp>
+
+#include <cubos/core/reflection/external/glm.hpp>
+#include <cubos/core/reflection/external/primitives.hpp>
+
+CUBOS_REFLECT_IMPL(demo::Mover)
+{
+    return cubos::core::ecs::ComponentTypeBuilder<Mover>("demo::Mover")
+        .withField("from", &Mover::from)
+        .withField("to", &Mover::to)
+        .withField("duration", &Mover::duration)
+        .withField("time", &Mover::time)
+        .withField("direction", &Mover::direction)
+        .build();
+}
diff --git a/platformer/src/mover/mover.hpp b/platformer/src/mover/mover.hpp
new file mode 100644
index 0000000..b03eac5
--- /dev/null
+++ b/platformer/src/mover/mover.hpp
@@ -0,0 +1,19 @@
+#pragma once
+
+#include <cubos/core/reflection/reflect.hpp>
+
+#include <glm/vec3.hpp>
+
+namespace demo
+{
+    struct [[cubos::component("")]] Mover
+    {
+        CUBOS_REFLECT;
+
+        glm::vec3 from;
+        glm::vec3 to;
+        float duration = 2.0F;
+        float time = 0.0F;
+        bool direction = false;
+    };
+} // namespace demo
diff --git a/platformer/src/mover/plugin.cpp b/platformer/src/mover/plugin.cpp
new file mode 100644
index 0000000..168f0d1
--- /dev/null
+++ b/platformer/src/mover/plugin.cpp
@@ -0,0 +1,38 @@
+#include "plugin.hpp"
+#include "mover.hpp"
+
+#include <cubos/engine/transform/position.hpp>
+#include <cubos/engine/physics/components/physics_velocity.hpp>
+
+#include <glm/gtc/matrix_transform.hpp>
+
+using cubos::core::ecs::Query;
+using cubos::core::ecs::Read;
+using cubos::core::ecs::Write;
+
+using namespace cubos::engine;
+
+using namespace demo;
+
+static void moverSystem(Query<Write<Mover>, Write<Position>, Write<PhysicsVelocity>> movers, Read<DeltaTime> deltaTime)
+{
+    for (auto [entity, mover, position, velocity] : movers)
+    {
+        mover->time += deltaTime->value * (mover->direction ? 1.0F : -1.0F);
+        if (mover->time > mover->duration || mover->time < 0.0F)
+        {
+            mover->time = glm::clamp(mover->time, 0.0F, mover->duration);
+            mover->direction = !mover->direction;
+        }
+
+        auto prev = position->vec;
+        position->vec = glm::mix(mover->from, mover->to, mover->time / mover->duration);
+        velocity->velocity = (position->vec - prev) / deltaTime->value;
+    }
+}
+
+void demo::moverPlugin(Cubos& cubos)
+{
+    cubos.addComponent<Mover>();
+    cubos.system(moverSystem).before("cubos.transform.update");
+}
diff --git a/platformer/src/mover/plugin.hpp b/platformer/src/mover/plugin.hpp
new file mode 100644
index 0000000..6a76d5c
--- /dev/null
+++ b/platformer/src/mover/plugin.hpp
@@ -0,0 +1,8 @@
+#pragma once
+
+#include <cubos/engine/cubos.hpp>
+
+namespace demo
+{
+    void moverPlugin(cubos::engine::Cubos& cubos);
+}