refactor: state into namespace

src/mesh.cpp

@@ -13,15 +13,15 @@ void Mesh::add_buffer(const std::shared_ptr<Buffer>& buffer,
 void Mesh::draw()
 {
 	// Calculate MVP matrix
-	glm::mat4 mvp = State::projection_matrix_ * State::view_matrix_
-	    * State::model_matrix_;
+	glm::mat4 mvp = state::projection_matrix * state::view_matrix
+	    * state::model_matrix;
 
 	// Draw each buffer with its shader
 	for (size_t i = 0; i < buffers_.size(); ++i) {
 		// Use buffer's shader if available, otherwise use default
 		// shader
 		std::shared_ptr<Shader> shader =
-		    shaders_[i] ? shaders_[i] : State::default_shader_;
+		    shaders_[i] ? shaders_[i] : state::default_shader;
 
 		if (shader) {
 			shader->use();