Resource Leak opengl/win32 - c++

Question

Hello I've recently started learning win32/opengl and I managed to write a function that displays a multi colored cube within a window. My problem is there is a resource leak but I'm stumped and not sure what exactly I'm forgetting to delete.
NOTE I have narrowed it down to be within this function
void display()
{
g.hglrc = wglCreateContext(g.hdc);
wglMakeCurrent(g.hdc, g.hglrc);
// make the color a white hue
glClearColor(1.0F, 1.0F, 1.0F, 1.0F);
// Clear screen and Z-buffer
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Reset transformations
glLoadIdentity();
// Rotate when user changes rotate_x and rotate_y
glRotatef(rotate_x, 1.0, 0.0, 0.0);
glRotatef(rotate_y, 0.0, 1.0, 0.0);
//Multi-colored side - FRONT
glBegin(GL_POLYGON);
glColor3f(1.0, 0.0, 0.0); glVertex3f(0.5, -0.5, -0.5); // P1 is red
glColor3f(0.0, 1.0, 0.0); glVertex3f(0.5, 0.5, -0.5); // P2 is green
glColor3f(0.0, 0.0, 1.0); glVertex3f(-0.5, 0.5, -0.5); // P3 is blue
glColor3f(1.0, 0.0, 1.0); glVertex3f(-0.5, -0.5, -0.5); // P4 is purple
glEnd();
// White side - BACK
glBegin(GL_POLYGON);
glColor3f(1.0, 1.0, 1.0);
glVertex3f(0.5, -0.5, 0.5);
glVertex3f(0.5, 0.5, 0.5);
glVertex3f(-0.5, 0.5, 0.5);
glVertex3f(-0.5, -0.5, 0.5);
glEnd();
// Purple side - RIGHT
glBegin(GL_POLYGON);
glColor3f(1.0, 0.0, 1.0);
glVertex3f(0.5, -0.5, -0.5);
glVertex3f(0.5, 0.5, -0.5);
glVertex3f(0.5, 0.5, 0.5);
glVertex3f(0.5, -0.5, 0.5);
glEnd();
// Green side - LEFT
glBegin(GL_POLYGON);
glColor3f(0.0, 1.0, 0.0);
glVertex3f(-0.5, -0.5, 0.5);
glVertex3f(-0.5, 0.5, 0.5);
glVertex3f(-0.5, 0.5, -0.5);
glVertex3f(-0.5, -0.5, -0.5);
glEnd();
// Blue side - TOP
glBegin(GL_POLYGON);
glColor3f(0.0, 0.0, 1.0);
glVertex3f(0.5, 0.5, 0.5);
glVertex3f(0.5, 0.5, -0.5);
glVertex3f(-0.5, 0.5, -0.5);
glVertex3f(-0.5, 0.5, 0.5);
glEnd();
// Red side - BOTTOM
glBegin(GL_POLYGON);
glColor3f(1.0, 0.0, 0.0);
glVertex3f(0.5, -0.5, -0.5);
glVertex3f(0.5, -0.5, 0.5);
glVertex3f(-0.5, -0.5, 0.5);
glVertex3f(-0.5, -0.5, -0.5);
glEnd();
wglMakeCurrent(NULL, NULL);
SwapBuffers(g.hdc);
ReleaseDC(g.hwnd, g.hdc);
wglDeleteContext(g.hglrc);
}

Answer 1

g.hglrc = wglCreateContext(g.hdc);
Don't do that.
You don't create a rendering context every time you need to redraw the screen. You create it once; it should only go away when your window goes away.
Now, that doesn't necessarily justify why creating and destroying a rendering context would leave resources lying around. But that's irrelevant; you shouldn't do it because of performance. Rendering context creation and destruction is not a fast process, nor is it intended to be.