fix: fixed transform updating and scale transformation

src/core/camera_node.c

@@ -54,7 +54,7 @@ Camera3D CameraNodeGetCamera(CameraNode *self) {
         .fovy = 90,
         .position = global_transform.translation,
         .projection = CAMERA_PERSPECTIVE,
-        .target = Vector3Add(global_transform.translation, Vector3Scale(forward, 1000.f)),
+        .target = Vector3Add(global_transform.translation, forward),
-        .up = (Vector3){mat.m4, mat.m5, mat.m6}
+        .up = MATRIX_UP(mat)
     };
 }

src/core/scene.c

@@ -28,6 +28,23 @@ void Internal_SceneNodeUpdateTransform(SceneNode *self) {
     }
 }
 
+//! Update global transforms of all children recursively
+static
+void Internal_SceneNodeUpdateTransformRecursive(SceneNode *self, bool is_dirty) {
+    if(TC_MIRRORS(self->entity, Transformable)) {
+        Transformable transformable = TC_CAST(self->entity, Transformable);
+        is_dirty = is_dirty || transformable.tc->get_dirty_bit(transformable.data);
+        if(is_dirty) {
+            transformable.tc->force_update(transformable.data);
+            transformable.tc->clear_dirty_bit(transformable.data);
+        }
+    } else {
+        is_dirty = false;
+    }
+    list_foreach(SceneNode **,child, &self->children)
+        Internal_SceneNodeUpdateTransformRecursive(*child, is_dirty);
+}
+
 //! Remove a single node (does NOT recurse to children children) from this scene.
 static
 void Internal_SceneRemoveNode(Scene *self, SceneNode *node) {
@@ -73,14 +90,6 @@ void Internal_SceneAddNode(Scene *self, SceneNode *node) {
         Internal_SceneAddNode(self, *child);
 }
 
-//! Update global transforms of all children recursively
-static
-void Internal_SceneNodeUpdateTransformRecursive(SceneNode *self) {
-    Internal_SceneNodeUpdateTransform(self);
-    list_foreach(SceneNode **,child, &self->children)
-        Internal_SceneNodeUpdateTransformRecursive(*child);
-}
-
 SceneNode *CreateSceneNode(SceneNodeEntity entity) {
     // initialize memory
     SceneNode *self = new(SceneNode);
@@ -173,5 +182,5 @@ void DestroyScene(Scene *self) {
 
 void SceneTick(Scene* self, double delta_time) {
     Internal_SceneNodeTick(self->root, delta_time);
-    Internal_SceneNodeUpdateTransformRecursive(self->root);
+    Internal_SceneNodeUpdateTransformRecursive(self->root, false);
 }

src/core/transform_node.c

@@ -20,7 +20,7 @@ impl_SceneNodeEntity_for(TransformNode,
 
 SceneNode *CreateTransformNode() {
     TransformNode *self = new(TransformNode);
-    self->dirty_bit = 0x0;
+    self->dirty_bit = 1;
     self->node = NULL;
     self->parent_transformable = tc_null(Transformable);
     self->global_transform = TransformIdentity();

src/core/transformable.c

@@ -25,7 +25,7 @@ Vector3 TransformDirection(Transform self, Vector3 local_direction) {
 }
 
 Vector3 TransformScale(Transform self, Vector3 local_scale) {
-    return Vector3Multiply(self.scale, TransformDirection(self, local_scale));
+    return Vector3Multiply(local_scale, self.scale);
 }
 
 Quaternion TransformRotation(Transform self, Quaternion local_rotation) {
@@ -54,11 +54,11 @@ Vector3 InverseTransformDirection(Transform self, Vector3 global_direction) {
 }
 
 Vector3 InverseTransformScale(Transform self, Vector3 global_scale) {
-    return Vector3Multiply(Vector3Invert(self.scale), InverseTransformDirection(self, global_scale));
+    return Vector3Multiply(global_scale, Vector3Invert(self.scale));
 }
 
 Quaternion InverseTransformRotation(Transform self, Quaternion global_rotation) {
-    return QuaternionDivide(self.rotation, global_rotation);
+    return QuaternionMultiply(QuaternionInvert(self.rotation), global_rotation);
 }
 
 Transform InverseTransformTransform(Transform self, Transform other) {

src/core/transformable.h

@@ -17,6 +17,7 @@ typedef struct ITransformable {
     void (*const set_global_transform)(void*, Transform);
     void (*const force_update)(void*);
     unsigned char (*const get_dirty_bit)(void*);
+    void (*const clear_dirty_bit)(void*);
     struct Transformable (*const get_parent_transformable)(void*);
 } ITransformable;
 
@@ -58,26 +59,29 @@ extern Transform InverseTransformTransform(Transform self, Transform other);
 //! Macro implements the interface functions itself to ensure consistent behaviour.
 #define impl_Transformable_for(T)\
 static Transform T##_get_transform_GEN_(T* self) { return self->transform; }\
-static void T##_set_transform_GEN_(T* self, Transform value) { self->transform = value; self->dirty_bit |= 1u; } /*!< sets dirty bit */\
+static void T##_set_transform_GEN_(T* self, Transform value) { self->transform = value; self->dirty_bit = 1; } /*!< sets dirty bit */\
 static Transform T##_get_global_transform_GEN_(T* self) { return self->global_transform; }\
 static void T##_set_global_transform_GEN_(T* self, Transform value) {\
-    self->global_transform = value;\
     if(tc_is_null(self->parent_transformable)) {\
         self->transform = value;\
     } else {\
+        if(self->parent_transformable.tc->get_dirty_bit(self->parent_transformable.data))\
+            self->parent_transformable.tc->force_update(self->parent_transformable.data);\
         Transform parent_global = self->parent_transformable.tc->get_global_transform(self->parent_transformable.data);\
         self->transform = InverseTransformTransform(parent_global, value); /* Use parent transform to transform the local transform to the new global transform */\
+        self->dirty_bit = 1;\
     }\
 }\
 static void T##_force_update_GEN_(T *self) {\
     if(tc_is_null(self->parent_transformable)) {\
         self->global_transform = self->transform;\
-        return;\
+    } else {\
+        Transform parent_global = self->parent_transformable.tc->get_global_transform(self->parent_transformable.data);\
+        self->global_transform = TransformTransform(parent_global, self->transform);\
     }\
-    Transform parent_global = self->parent_transformable.tc->get_global_transform(self->parent_transformable.data);\
-    self->global_transform = TransformTransform(parent_global, self->transform);\
 }\
 static unsigned char T##_get_dirty_bit_GEN_(T *self) { return self->dirty_bit; }\
+static void T##_clear_dirty_bit_GEN_(T *self) { self->dirty_bit = 0; }\
 static Transformable T##_get_parent_transformable_GEN_(T *self) { return self->parent_transformable; }\
 Transformable T##_as_Transformable(T *x) {\
     static ITransformable const tc = {\
@@ -87,6 +91,7 @@ Transformable T##_as_Transformable(T *x) {\
         .set_global_transform     = (void (*const)(void*,Transform)) T##_set_global_transform_GEN_,\
         .force_update             = (void (*const)(void*)) T##_force_update_GEN_,\
         .get_dirty_bit            = (unsigned char (*const)(void*)) T##_get_dirty_bit_GEN_,\
+        .clear_dirty_bit          = (void (*const)(void*)) T##_clear_dirty_bit_GEN_,\
         .get_parent_transformable = (Transformable (*const)(void*)) T##_get_parent_transformable_GEN_\
     };\
     return (Transformable){ .tc = &tc, .data = x, .scene_node_entity = T##_as_SceneNodeEntity(x).tc, .mirror = T##_as_Mirror(x).tc };\

src/main.c

@@ -10,17 +10,19 @@
 
 Scene *CreateInitialScene() {
     SceneNode *root = CreateTransformNode();
+    SceneNode *model_parent = CreateTransformNode();
+    SceneNodeAddChild(root, model_parent);
+
     SceneNode *camera_parent = CreateTransformNode();
+    SceneNodeAddChild(model_parent, camera_parent);
     // set camera parent location
         Transformable transformable = TC_CAST(camera_parent->entity, Transformable);
         Transform transform = transformable.tc->get_transform(transformable.data);
         transform.translation = (Vector3){0.f, 10.f, -10.f};
         transform.rotation = QuaternionFromEuler(45.f * DEG2RAD, 0.f, 0.f);
         transformable.tc->set_transform(transformable.data, transform);
+
     SceneNodeAddChild(camera_parent, CreateCameraNode());
-    SceneNode *model_parent = CreateTransformNode();
-    SceneNodeAddChild(root, model_parent);
-    SceneNodeAddChild(model_parent, camera_parent);
     SceneNodeAddChild(model_parent, CreateMeshRenderEntity("spacefighter.glb"));
     SceneNodeAddChild(model_parent, CreateTestObject());
     return CreateScene(root);