Add support for external depencencies

tests/basic.d

@@ -1220,4 +1220,279 @@ unittest
     assert(*entity2.getComponent!CInt == 13);
 
     gEM.end();
+}
+
+@("SystemDependencies")
+unittest
+{
+    struct TestSystem
+    {
+        mixin ECS.System;
+
+        struct EntitiesData
+        {
+            uint length;
+            @readonly CInt[] int_;
+        }
+
+        void onUpdate(EntitiesData entities)
+        {
+            
+        }
+    }
+
+    struct TestSystem2
+    {
+        mixin ECS.System;
+
+        struct EntitiesData
+        {
+            uint length;
+            CInt[] int_;
+        }
+
+        void onUpdate(EntitiesData entities)
+        {
+            
+        }
+    }
+
+    struct TestSystem3
+    {
+        mixin ECS.System;
+
+        struct EntitiesData
+        {
+            uint length;
+            @readonly CInt[] int_;
+        }
+
+        void onUpdate(EntitiesData entities)
+        {
+            
+        }
+    }
+
+    struct TestSystem4
+    {
+        mixin ECS.System;
+
+        struct EntitiesData
+        {
+            uint length;
+            CInt[] int_;
+            CLong[] long_;
+        }
+
+        void onUpdate(EntitiesData entities)
+        {
+            
+        }
+    }
+
+    struct TestSystem5
+    {
+        mixin ECS.System;
+
+        struct EntitiesData
+        {
+            uint length;
+            @readonly CLong[] int_;
+        }
+
+        void onUpdate(EntitiesData entities)
+        {
+            
+        }
+    }
+
+    void func1(TestSystem.EntitiesData entities)
+    {
+        foreach(i;0 .. entities.length)
+        {
+            entities.int_[i] += entities.int_[i] / 2;
+        }
+    }
+
+    void func2(TestSystem.EntitiesData entities)
+    {
+        foreach(i;0 .. entities.length)
+        {
+            entities.int_[i] += 8;
+        }
+    }
+
+    gEM.beginRegister();
+
+    gEM.registerSystem!TestSystem(0);
+    gEM.registerSystem!TestSystem2(1);
+    gEM.registerSystem!TestSystem3(2);
+    gEM.registerSystem!TestSystem4(3);
+    gEM.registerSystem!TestSystem5(4);
+
+    gEM.endRegister();
+
+    const (EntityManager.UpdatePass)* pass = gEM.getPass("update");
+    assert(pass != null);
+    assert(pass.system_callers.length == 5);
+    assert(pass.system_callers[0].system_id == TestSystem.system_id);
+    assert(pass.system_callers[1].system_id == TestSystem2.system_id);
+    assert(pass.system_callers[2].system_id == TestSystem3.system_id);
+    assert(pass.system_callers[3].system_id == TestSystem4.system_id);
+    assert(pass.system_callers[4].system_id == TestSystem5.system_id);
+    assert(pass.system_callers[0].dependencies.length == 0);
+    assert(pass.system_callers[1].dependencies.length == 1);
+    assert(pass.system_callers[2].dependencies.length == 1);
+    assert(pass.system_callers[3].dependencies.length == 3);
+    assert(pass.system_callers[4].dependencies.length == 1);
+    assert(pass.system_callers[1].dependencies[0].system_id == TestSystem.system_id);
+    assert(pass.system_callers[2].dependencies[0].system_id == TestSystem2.system_id);
+    assert(pass.system_callers[3].dependencies[0].system_id == TestSystem.system_id);
+    assert(pass.system_callers[3].dependencies[1].system_id == TestSystem2.system_id);
+    assert(pass.system_callers[3].dependencies[2].system_id == TestSystem3.system_id);
+    assert(pass.system_callers[4].dependencies[0].system_id == TestSystem4.system_id);
+}
+
+@("ExternalSystemDependencies")
+unittest
+{
+    enum TestDependency = "TestDepencency";
+    
+    struct TestSystem
+    {
+        mixin ECS.System;
+
+        mixin ECS.ReadOnlyDependencies!(TestDependency);
+
+        struct EntitiesData
+        {
+            uint length;
+            @readonly CInt[] int_;
+        }
+
+        void onUpdate(EntitiesData entities)
+        {
+            
+        }
+    }
+
+    struct TestSystem2
+    {
+        mixin ECS.System;
+
+        mixin ECS.WritableDependencies!(TestDependency);
+
+        struct EntitiesData
+        {
+            uint length;
+            @readonly CInt[] int_;
+        }
+
+        void onUpdate(EntitiesData entities)
+        {
+            
+        }
+    }
+
+    struct TestSystem3
+    {
+        mixin ECS.System;
+        
+        mixin ECS.ReadOnlyDependencies!(TestDependency);
+
+        struct EntitiesData
+        {
+            uint thread_id;
+        }
+
+        void onUpdate(EntitiesData entities)
+        {
+            
+        }
+    }
+
+    struct TestSystem4
+    {
+        mixin ECS.System;
+
+        mixin ECS.WritableDependencies!(TestDependency);
+
+        struct EntitiesData
+        {
+            uint length;
+            @readonly CInt[] int_;
+        }
+
+        void onUpdate(EntitiesData entities)
+        {
+            
+        }
+    }
+
+    struct TestSystem5
+    {
+        mixin ECS.System;
+
+        mixin ECS.ReadOnlyDependencies!(TestDependency);
+
+        struct EntitiesData
+        {
+            uint length;
+            @readonly CLong[] int_;
+        }
+
+        void onUpdate(EntitiesData entities)
+        {
+            
+        }
+    }
+
+    void func1(TestSystem.EntitiesData entities)
+    {
+        foreach(i;0 .. entities.length)
+        {
+            entities.int_[i] += entities.int_[i] / 2;
+        }
+    }
+
+    void func2(TestSystem.EntitiesData entities)
+    {
+        foreach(i;0 .. entities.length)
+        {
+            entities.int_[i] += 8;
+        }
+    }
+
+    gEM.beginRegister();
+
+    gEM.registerDependency(TestDependency);
+
+    gEM.registerSystem!TestSystem(0);
+    gEM.registerSystem!TestSystem2(1);
+    gEM.registerSystem!TestSystem3(2);
+    gEM.registerSystem!TestSystem4(3);
+    gEM.registerSystem!TestSystem5(4);
+
+    gEM.endRegister();
+
+    const (EntityManager.UpdatePass)* pass = gEM.getPass("update");
+    assert(pass != null);
+    assert(pass.system_callers.length == 5);
+    assert(pass.system_callers[0].system_id == TestSystem.system_id);
+    assert(pass.system_callers[1].system_id == TestSystem2.system_id);
+    assert(pass.system_callers[2].system_id == TestSystem3.system_id);
+    assert(pass.system_callers[3].system_id == TestSystem4.system_id);
+    assert(pass.system_callers[4].system_id == TestSystem5.system_id);
+    assert(pass.system_callers[0].dependencies.length == 0);
+    assert(pass.system_callers[1].dependencies.length == 1);
+    assert(pass.system_callers[2].dependencies.length == 1);
+    assert(pass.system_callers[3].dependencies.length == 3);
+    assert(pass.system_callers[4].dependencies.length == 2);
+    assert(pass.system_callers[1].dependencies[0].system_id == TestSystem.system_id);
+    assert(pass.system_callers[2].dependencies[0].system_id == TestSystem2.system_id);
+    assert(pass.system_callers[3].dependencies[0].system_id == TestSystem.system_id);
+    assert(pass.system_callers[3].dependencies[1].system_id == TestSystem2.system_id);
+    assert(pass.system_callers[3].dependencies[2].system_id == TestSystem3.system_id);
+    assert(pass.system_callers[4].dependencies[0].system_id == TestSystem2.system_id);
+    assert(pass.system_callers[4].dependencies[1].system_id == TestSystem4.system_id);
 }