Implemented missing heirarchical transforms functionality

orgfile.org

@@ -238,6 +238,8 @@ x Font atlas proper cleanup
 ** DONE Array-based Hashmaps
 - State "DONE"       from "TODO"       [2017-05-07 Sun 18:42]
 ** TODO Sprite sheet animations
+** DONE Fix bugs with heirarchical transformations
+- State "DONE"       from "TODO"       [2017-06-01 Thu 00:20]
 ** TODO Replace orgfile with simple text readme and reduce duplication?
 ** TODO Ray picking
 ** TODO Remove reduntant "settings" structures and move all configuration stuff to config variables

src/scene.c

@@ -24,12 +24,7 @@ struct Entity* scene_add_new(const char* name, const int type)
 struct Entity* scene_add_as_child(const char* name, const int type, int parent_id)
 {
 	assert(parent_id > -1);
-	struct Entity* new_entity = NULL;
-	new_entity = entity_create(name, type, parent_id);
-	struct Entity* parent = entity_get(parent_id);
-	new_entity->transform.parent = parent->id;
-	transform_update_transmat(new_entity);
-	return new_entity;
+	return entity_create(name, type, parent_id);
 }
 
 void scene_remove(struct Entity* entity)

src/transform.c

@@ -12,11 +12,60 @@ void transform_create(struct Entity* entity, int parent_entity)
 	vec3_fill(&transform->scale, 1.f, 1.f, 1.f);
 	quat_identity(&transform->rotation);
 	mat4_identity(&transform->trans_mat);
-	transform->parent   = parent_entity;
 	transform->children = array_new(int);
+	transform->parent   = -1;
+	if(parent_entity != -1)
+		transform_parent_set(entity, entity_get(parent_entity), false);
 	transform_update_transmat(entity);
 }
 
+void transform_child_add(struct Entity* parent, struct Entity* child, bool update_transmat)
+{
+	struct Transform* parent_transform = &parent->transform;
+	struct Transform* child_transform  = &child->transform;
+
+    /* Check if already added */
+	for(int i = 0; i < array_len(parent_transform->children); i++)
+		if(parent_transform->children[i] == child->id) return;
+	
+	int* new_child_loc = array_grow(parent_transform->children, int);
+	*new_child_loc = child->id;
+	child_transform->parent = parent->id;
+	if(update_transmat) transform_update_transmat(child);
+}
+
+bool transform_child_remove(struct Entity* parent, struct Entity* child)
+{
+	bool success = false;
+	struct Transform* parent_transform = &parent->transform;
+	for(int i = 0; i < array_len(parent_transform->children); i++)
+	{
+		if(parent_transform->children[i] == child->id)
+		{
+			array_remove_at(parent_transform, i);
+			child->transform.parent = -1;
+			success = true;
+			return success;
+		};
+	}
+	return success;
+}
+
+void transform_parent_set(struct Entity* child, struct Entity* parent, bool update_transmat)
+{
+	if(child->transform.parent == -1)
+	{
+		transform_child_add(parent, child, false);
+	}
+	else
+	{
+		transform_child_remove(parent, child);
+		transform_child_add(parent, child, false);
+	}
+
+	if(update_transmat) transform_update_transmat(child);
+}
+
 void transform_translate(struct Entity* entity, vec3* amount, enum Transform_Space space)
 {
 	struct Transform* transform = &entity->transform;

src/transform.h

@@ -2,31 +2,35 @@
 #define TRANSFORM_H
 
 #include "linmath.h"
+#include "num_types.h"
 
 enum Transform_Space { TS_LOCAL, TS_PARENT, TS_WORLD};
 
 struct Entity;
 
-void transform_create(struct Entity* transform, int parent_entity);
-void transform_destroy(struct Entity* transform);
-void transform_translate(struct Entity* transform, vec3* amount, enum Transform_Space space);
+void transform_create(struct Entity* entity, int parent_entity);
+void transform_destroy(struct Entity* entity);
+void transform_translate(struct Entity* entity, vec3* amount, enum Transform_Space space);
 void transform_rotate(struct Entity*    transform,
 					  vec3*                axis,
 					  float                angle,
 					  enum Transform_Space space);
-void transform_scale(struct Entity* transform, vec3* scale);
-void transform_set_position(struct Entity* transform, vec3* new_position);
-void transform_get_forward(struct Entity* transform, vec3* res);
-void transform_get_lookat(struct Entity* transform, vec3* res);
-void transform_get_up(struct Entity* transform, vec3* res);
-void transform_get_right(struct Entity* transform, vec3* res);
-void transform_update_transmat(struct Entity* transform);
-void transform_get_absolute_pos(struct Entity* transform, vec3* res);
-void transform_get_absolute_rot(struct Entity* transform, quat* res);
-void transform_get_absolute_scale(struct Entity* transform, vec3* res);
-void transform_get_absolute_lookat(struct Entity* transform, vec3* res);
-void transform_get_absolute_up(struct Entity* transform, vec3* res);
-void transform_get_absolute_right(struct Entity* transform, vec3* res);
-void transform_get_absolute_forward(struct Entity* transform, vec3* res);
+void transform_scale(struct Entity* entity, vec3* scale);
+void transform_set_position(struct Entity* entity, vec3* new_position);
+void transform_get_forward(struct Entity* entity, vec3* res);
+void transform_get_lookat(struct Entity* entity, vec3* res);
+void transform_get_up(struct Entity* entity, vec3* res);
+void transform_get_right(struct Entity* entity, vec3* res);
+void transform_update_transmat(struct Entity* entity);
+void transform_get_absolute_pos(struct Entity* entity, vec3* res);
+void transform_get_absolute_rot(struct Entity* entity, quat* res);
+void transform_get_absolute_scale(struct Entity* entity, vec3* res);
+void transform_get_absolute_lookat(struct Entity* entity, vec3* res);
+void transform_get_absolute_up(struct Entity* entity, vec3* res);
+void transform_get_absolute_right(struct Entity* entity, vec3* res);
+void transform_get_absolute_forward(struct Entity* entity, vec3* res);
+void transform_child_add(struct Entity* entity, struct Entity* child, bool update_transmat);
+bool transform_child_remove(struct Entity* entity, struct Entity* child);
+void transform_parent_set(struct Entity* entity, struct Entity* parent, bool update_transmat);
 
 #endif