Add basic node for model

src/basic.h

@@ -1,7 +1,10 @@
 #pragma once
 
+#define GLM_ENABLE_EXPERIMENTAL
+
 #include <string>
 #include <glm/glm.hpp>
+#include <glm/gtx/quaternion.hpp>
 
 typedef unsigned char      u8;
 typedef unsigned short     u16;
@@ -25,4 +28,5 @@ typedef std::string string;
 using Vector2 = glm::vec2;
 using Vector3 = glm::vec3;
 using Matrix4 = glm::mat4;
+using Quaternion = glm::quat;
 

src/model.cpp

@@ -38,6 +38,11 @@ bool load_model(Model *model, Render_Data *render_data, string model_filepath, s
 
   glBindVertexArray(0);
 
+
+  s32 root_node_id = model->gltf_model->scenes.at(0).nodes.at(0);
+   create_root(model->root_node, root_node_id);
+  
+
   render_data->triangle_count = get_model_triangle_count(model);
 
   return true;

src/model.h

@@ -7,6 +7,7 @@
 #include <tiny_gltf/tiny_gltf.h>
 #include "texture.h"
 #include "render_data.h"
+#include "node.h"
 
 struct Model {
   tinygltf::Model* gltf_model = nullptr;
@@ -15,6 +16,7 @@ struct Model {
   u32 index_vbo = 0;
   std::map<string, s32> attributes = {{"POSITION", 0}, {"NORMAL", 1}, {"TEXCOORD_0", 2}};
   Texture texture;
+  Node* root_node = nullptr;
 };
 
 

src/node.cpp

@@ -0,0 +1,14 @@
+#include "node.h"
+
+void calculate_local_trs_matrix(Node *node) {
+  Matrix4 scale_matrix = glm::scale(Matrix4(1.0f), node->scale);
+  Matrix4 rotation_matrix = glm::mat4_cast(node->rotation);
+  Matrix4 translation_matrix = glm::translate(Matrix4(1.0f), node->translation);
+
+  node->local_trs_matrix = translation_matrix * rotation_matrix * scale_matrix;
+}
+
+void create_root_node(Node *node, s32 root_node_id) {
+  
+}
+

src/node.h

@@ -0,0 +1,16 @@
+#include "basic.h"
+#include <vector>
+
+struct Node {
+  std::vector<Node*> children;
+  Vector3 scale = Vector3(1.0f);
+  Vector3 translation = Vector3(0.0f);
+  Quaternion rotation = Quaternion(1.0f, 0.0f, 0.0f, 0.0f);
+
+  Matrix4 local_trs_matrix = Matrix4(1.0f);
+  Matrix4 node_matrix = Matrix4(1.0f);
+  Matrix4 inverse_bind_matrix = Matrix4(1.0f);
+};
+
+void calculate_local_trs_matrix(Node *node);
+void create_root_node(Node *node, s32 root_node_id);