From 1156c0f58b01ff080b9d9ede15b449a845df6654 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Wed, 11 Mar 2020 01:52:27 +0100
Subject: Starting on entity system...

---
 src/entity/Entity.cpp | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/entity/Entity.cpp

(limited to 'src/entity/Entity.cpp')

diff --git a/src/entity/Entity.cpp b/src/entity/Entity.cpp
new file mode 100644
index 0000000..57f6110
--- /dev/null
+++ b/src/entity/Entity.cpp
@@ -0,0 +1,62 @@
+#include "../../include/entity/Entity.hpp"
+#include <assert.h>
+
+namespace amalgine {
+    EntityWorld::EntityWorld() {
+        for(int i = 0; i < NUM_ENTITIES; ++i) {
+            mask[i] = ENTITY_MASK_NONE;
+            transformation[i] = glm::mat4(1.0f);
+            velocity[i] = glm::vec3(0.0f, 0.0f, 0.0f);
+            mesh_instance[i] = MeshInstance();
+        }
+    }
+
+    Entity EntityWorld::create_entity(EntityMask type) {
+        for(int i = 0; i < NUM_ENTITIES; ++i) {
+            if(mask[i] == ENTITY_MASK_NONE) {
+                mask[i] = type;
+                return i;
+            }
+        }
+        return INVALID_ENTITY;
+    }
+
+    void EntityWorld::remove_entity(Entity entity) {
+        mask[entity] = ENTITY_MASK_NONE;
+    }
+
+    glm::mat4& EntityWorld::get_transformation(Entity entity) {
+        assert(mask[entity] & ENTITY_MASK_TRANSFORMATION);
+        return transformation[entity];
+    }
+
+    glm::vec3& EntityWorld::get_velocity(Entity entity) {
+        assert(mask[entity] & ENTITY_MASK_VELOCITY);
+        return velocity[entity];
+    }
+
+    MeshInstance& EntityWorld::get_mesh_instance(Entity entity) {
+        assert(mask[entity] & ENTITY_MASK_MESH_COMPONENT);
+        return mesh_instance[entity];
+    }
+
+    void EntityWorld::update() {
+        const float gravity = -9.8f;
+        for(int i = 0; i < NUM_ENTITIES; ++i) {
+            velocity[i].z -= gravity;
+        }
+
+        const EntityMaskType transform_velocity_mask = ENTITY_MASK_TRANSFORMATION | ENTITY_MASK_VELOCITY;
+        for(int i = 0; i < NUM_ENTITIES; ++i) {
+            if((mask[i] & transform_velocity_mask) == transform_velocity_mask) {
+                transformation[i][3].x += velocity[i].x;
+                transformation[i][3].y += velocity[i].y;
+                transformation[i][3].z += velocity[i].z;
+            }
+        }
+
+        for(int i = 0; i < NUM_ENTITIES; ++i) {
+            mesh_instance[i].update();
+        }
+    }
+}
\ No newline at end of file
-- 
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