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diff --git a/src/blu_cat/gra/uniform_data_object.hpp b/src/blu_cat/gra/uniform_data_object.hpp
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+++ b/src/blu_cat/gra/uniform_data_object.hpp
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+/*
+ * Copyright 2022-2024 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.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BLU_CAT_GRA_UNIFORM_DATA_OBJECT_H
+#define BLU_CAT_GRA_UNIFORM_DATA_OBJECT_H 1
+
+#include "vulkan.hpp"
+#include "skeletal_mesh_vertex.hpp"
+
+namespace BluCat::GRA
+{
+
+// UDO = "uniform data object"
+
+struct UDOView2D
+{
+  glm::mat4 proj;
+};
+
+struct UDOView3D
+{
+  glm::mat4 view;
+  glm::mat4 proj;
+};
+
+struct UDOWorld3D_Vert
+{
+  glm::vec4 ambient_light_color;
+};
+
+struct UDOWorld3D_Frag
+{
+  glm::vec3 directional_light_direction;
+  glm::vec4 directional_light_color;
+};
+
+struct UDOStaticModel
+{
+  glm::mat4 base_matrix;
+};
+
+struct UDOSkeletalModel
+{
+  glm::mat4 base_matrix;
+  glm::mat4 bone_matrices[SKELETAL_MESH_MAX_NUM_OF_BONES];
+};
+
+struct UDOVector4D
+{
+  glm::vec4 vector;
+};
+
+struct UDOVector3D
+{
+  glm::vec3 vectors;
+};
+
+struct UDOSprite3D
+{
+  glm::vec3 position;
+  uint32_t padding;
+  glm::vec2 size;
+};
+
+}
+
+#endif /* BLU_CAT_GRA_UNIFORM_DATA_OBJECT_H */