feat Add hierarchy to skeletal meshHEADmaster

4 files changed, 37 insertions, 25 deletions

diff --git a/src/blu_cat/gra/animation.cpp b/src/blu_cat/gra/animation.cpp
index dc2c281..062fb48 100644
--- a/src/blu_cat/gra/animation.cpp
+++ b/src/blu_cat/gra/animation.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,8 +19,9 @@
 namespace BluCat::GRA
 {
 
-Bone::Bone(glm::mat4 offset_matrix):
-  offset_matrix{offset_matrix}
+Bone::Bone(glm::mat4 offset_matrix, UI16 parent):
+  offset_matrix{offset_matrix},
+	parent{parent}
 {
 }
 
diff --git a/src/blu_cat/gra/animation.hpp b/src/blu_cat/gra/animation.hpp
index 1275b48..11b1d0a 100644
--- a/src/blu_cat/gra/animation.hpp
+++ b/src/blu_cat/gra/animation.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2024 Frederico de Oliveira Linhares
+ * Copyright 2022-2025 Frederico de Oliveira Linhares
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,15 +28,16 @@ namespace BluCat::GRA
 struct Bone
 {
   glm::mat4x4 offset_matrix;
+	UI16 parent;
 
-  Bone(glm::mat4 offset_matrix);
+  Bone(glm::mat4 offset_matrix, UI16 parent);
 };
 
 struct BoneTransform
 {
   uint32_t bone_id;
-  Channel<glm::vec3> positions;
   Channel<glm::quat> rotations;
+  Channel<glm::vec3> positions;
   Channel<glm::vec3> scales;
 };
 
diff --git a/src/blu_cat/gra/skeletal_mesh.cpp b/src/blu_cat/gra/skeletal_mesh.cpp
index 1515dda..8e2e39f 100644
--- a/src/blu_cat/gra/skeletal_mesh.cpp
+++ b/src/blu_cat/gra/skeletal_mesh.cpp
@@ -86,7 +86,7 @@ load_mesh(void *obj)
 			SKELETAL_MESH_HEADER_SIZE +
 			header.num_vertexes * 16 * SIZE_32_BIT +
 			header.num_indexes * SIZE_32_BIT +
-			header.num_bones * 16 * SIZE_32_BIT +
+			header.num_bones * (16 * SIZE_32_BIT + SIZE_16_BIT) +
 			header.num_animations * (2 * SIZE_64_BIT + SIZE_32_BIT) +
 			header.num_bone_transforms * 4 * SIZE_32_BIT +
 			header.num_bone_positions * (3 * SIZE_32_BIT + SIZE_64_BIT) +
@@ -153,7 +153,11 @@ load_mesh(void *obj)
   { // Load bones
     self->mesh->bones.reserve(header.num_bones);
     for(int i{0}; i < header.num_bones; i++)
-      self->mesh->bones.emplace_back(input.read_mat4());
+		{
+			auto matrix{input.read_mat4()};
+			auto parent{input.read_ui16()};
+      self->mesh->bones.emplace_back(matrix, parent);
+		}
   }
 
   { // Load animations
diff --git a/src/blu_cat/gra/skeletal_model.cpp b/src/blu_cat/gra/skeletal_model.cpp
index 4b44910..726b97e 100644
--- a/src/blu_cat/gra/skeletal_model.cpp
+++ b/src/blu_cat/gra/skeletal_model.cpp
@@ -172,30 +172,30 @@ SkeletalModel::~SkeletalModel()
 void
 SkeletalModel::tick(float delta)
 {
-  BluCat::GRA::Animation *current_animation =
-    &this->skeletal_mesh->animations[this->animation_index];
+  BluCat::GRA::Animation &current_animation =
+    this->skeletal_mesh->animations[this->animation_index];
 
   { // update time
     this->animation_time += delta;
-    if(this->animation_time > current_animation->final_time)
+    if(this->animation_time > current_animation.final_time)
     {
-      this->animation_time -= current_animation->final_time;
+      this->animation_time -= current_animation.final_time;
       for(BluCat::GRA::BoneTransform &bone_transform:
-	    current_animation->bone_transforms)
+						current_animation.bone_transforms)
       {
-	bone_transform.positions.current_index = 0;
-	bone_transform.rotations.current_index = 0;
-	bone_transform.scales.current_index = 0;
+				bone_transform.positions.current_index = 0;
+				bone_transform.rotations.current_index = 0;
+				bone_transform.scales.current_index = 0;
       }
     }
   }
 
-  for(int i{0}; i < current_animation->bone_transforms.size(); i++)
+  for(UI16 i{0}; i < current_animation.bone_transforms.size(); i++)
   {
-    BluCat::GRA::BoneTransform *bone_transform =
-			&current_animation->bone_transforms[i];
+    BluCat::GRA::BoneTransform &bone_transform =
+			current_animation.bone_transforms[i];
 
-    auto position{bone_transform->positions.interpolate(
+    auto position{bone_transform.positions.interpolate(
 				this->animation_time,
 				[](glm::vec3 frame)
 					{
@@ -208,7 +208,7 @@ SkeletalModel::tick(float delta)
 						return glm::translate(glm::mat4(1.0f), final_position);
 					})};
 
-    auto rotation{bone_transform->rotations.interpolate(
+    auto rotation{bone_transform.rotations.interpolate(
 				this->animation_time,
 				[](glm::quat frame)
 					{
@@ -220,7 +220,7 @@ SkeletalModel::tick(float delta)
 																 previous_frame, next_frame, scale_factor));
 					})};
 
-    auto scale{bone_transform->scales.interpolate(
+    auto scale{bone_transform.scales.interpolate(
 				this->animation_time,
 				[](glm::vec3 frame)
 					{
@@ -233,9 +233,15 @@ SkeletalModel::tick(float delta)
 						return glm::scale(glm::mat4(1.0f), scale);
 					})};
 
-    this->bone_transforms[i] =
-			this->skeletal_mesh->bones[i].offset_matrix *
-			(position * rotation * scale);
+		auto parent{this->skeletal_mesh->bones[i].parent};
+		auto node_transform{(this->skeletal_mesh->bones[i].offset_matrix *
+												 (position * rotation * scale))};
+
+		if(parent == i)
+			this->bone_transforms[i] = node_transform;
+		else
+			this->bone_transforms[i] =
+				this->bone_transforms[parent] * node_transform;
   }
 }