diff --git a/src/test_window.cpp b/src/test_window.cpp
index 7137909..69fa79e 100644
--- a/src/test_window.cpp
+++ b/src/test_window.cpp
@@ -4,6 +4,10 @@
 #include <GLFW/glfw3.h>
 #include <glpy.h>
 
+static int CreateShader(const std::string& vertexShader, const std::string& fragmentShader){
+    unsigned int program = glCreateProgram();
+    unsigned int vs = glCreateShader(GL_VERTEX_SHADER);
+}
 
 int tests::glfw_window(unsigned width,unsigned height, std::string title)
 {
@@ -28,17 +32,35 @@ int tests::glfw_window(unsigned width,unsigned height, std::string title)
 
     std::cout<<"-- OPEN_GL_VERSION: "<<glGetString(GL_VERSION)<<std::endl;
 
+    float positions[6] = {
+        -0.5f,-0.5f,
+         0.0f, 0.5f,
+         0.5f,-0.5f,
+    };
+
+    unsigned int buffer;
+    glGenBuffers(1,&buffer);
+    glBindBuffer(GL_ARRAY_BUFFER,buffer);
+    glBufferData(GL_ARRAY_BUFFER,6 * sizeof(float),positions,GL_STATIC_DRAW);
+
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0,2,GL_FLOAT,GL_FALSE,2*sizeof(float),0);
+
+    glBindBuffer(GL_ARRAY_BUFFER,0);
+
     /* Loop until the user closes the window */
     while (!glfwWindowShouldClose(window))
     {
         /* Render here */
         glClear(GL_COLOR_BUFFER_BIT);
 
-        glBegin(GL_TRIANGLES);
-        glVertex2f(-0.5f,-0.5f);
-        glVertex2f(0.0f,0.5f);
-        glVertex2f(0.5f,-0.5f);
-        glEnd();
+        //create a triangle
+        glDrawArrays(GL_TRIANGLES,0, 3);
+        // glBegin(GL_TRIANGLES);
+        // glVertex2f(-0.5f,-0.5f);
+        // glVertex2f(0.0f,0.5f  );
+        // glVertex2f(0.5f,-0.5f);
+        // glEnd();
 
         /* Swap front and back buffers */
         glfwSwapBuffers(window);