Created Index buffer

Window_practice/Debug/Window_practice.log

@@ -1,2 +1,5 @@
   Main.cpp
+LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library
+LINK : warning LNK4098: defaultlib 'LIBCMT' conflicts with use of other libs; use /NODEFAULTLIB:library
+glew32s.lib(glew.obj) : warning LNK4099: PDB '' was not found with 'glew32s.lib(glew.obj)' or at ''; linking object as if no debug info
   Window_practice.vcxproj -> C:\dev\Glfw_Practice\c++\Window_practice\Debug\Window_practice.exe

Window_practice/src/Main.cpp

@@ -112,21 +112,36 @@ int main(void){
     std::cout << "OpenGL version: " << glGetString(GL_VERSION) << std::endl;
 
     //vertex positions
-    float positions[6] = {
-        -0.5f, -0.5f,  //Vertex2f
-         0.0f,  0.5f,  //Vertex2f
-         0.5f, -0.5f   //Vertex2f
+    float positions[] = {
+        -0.5f, -0.5f,
+         0.5f, -0.5f,
+         0.5f,  0.5f,  
+        -0.5f,  0.5f         
     };
 
+    //index buffer
+    unsigned int indecies[]{
+        0, 1, 2,
+        2, 3, 0
+    };
+
+
+
     //Vertex buffer(s)
     unsigned int buffer;
     glGenBuffers(1, &buffer); //number of buffer to generate
     glBindBuffer(GL_ARRAY_BUFFER, buffer); //binding the buffer
-    glBufferData(GL_ARRAY_BUFFER, 6 * sizeof(float), positions, GL_STATIC_DRAW);
+    glBufferData(GL_ARRAY_BUFFER, 6 * 2 * sizeof(float), positions, GL_STATIC_DRAW);
 
     glEnableVertexAttribArray(0);
     glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 2, 0);
 
+    //index buffer setup
+    unsigned int ibo; //index buffer object
+    glGenBuffers(1, &ibo); 
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo); //binding the buffer
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, 6 * sizeof(unsigned int), indecies, GL_STATIC_DRAW);
+
     ShaderProgramSource source = ParseShader("res/shaders/Basic.shader");
     std::cout << "VERTEX" << std::endl;
     std::cout << source.VertexSource << std::endl;
@@ -143,7 +158,7 @@ int main(void){
         /* Render here */
         glClear(GL_COLOR_BUFFER_BIT);
 
-        glDrawArrays(GL_TRIANGLES, 0, 3); //without index buffer 
+        glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, nullptr);
 
         /* Swap front and back buffers */
         glfwSwapBuffers(window);