How do I show and control a cube in this opengl example?

[SwissProgrammer]

How do I show and control a cube in this opengl example?

Hello.

I have the following that works with XP 32 bit and CodeBlocks 17.12 and minGW.

In the following, where it says, "OpenGL animation code goes here", how do I place a cube there that I can zoom in and out and move up, down, left, right via my program code and via the keyboard?

I do not want sound and other stuff. Just a very very simple example.


>>>>> please! No Visual Studio please! <<<<<

Thank you.



This uses gl.h which I did not include since it has 1,476 lines. If you need it, I can post it.

//   main.cpp

using namespace std;

#include <windows.h>
#include "gl.h"

LRESULT CALLBACK WindowProc(HWND, UINT, WPARAM, LPARAM);

void EnableOpenGL(HWND hwnd, HDC*, HGLRC*);

void DisableOpenGL(HWND, HDC, HGLRC);


int WINAPI WinMain ( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow )
    {
        WNDCLASSEX wcex;
        HWND hwnd;
        HDC hDC;
        HGLRC hRC;
        MSG msg;
        BOOL bQuit = FALSE;
        float theta = 0.0f;

        /* register window class */
        wcex.cbSize = sizeof(WNDCLASSEX);
        wcex.style = CS_OWNDC;
        wcex.lpfnWndProc = WindowProc;
        wcex.cbClsExtra = 0;
        wcex.cbWndExtra = 0;
        wcex.hInstance = hInstance;
        wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION);
        wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
        wcex.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
        wcex.lpszMenuName = NULL;
        wcex.lpszClassName = "GLSample";
        wcex.hIconSm = LoadIcon(NULL, IDI_APPLICATION);;


        if (!RegisterClassEx(&wcex))
            {
                return 0;
            }

        /* create main window */
        hwnd = CreateWindowEx(0,
                              "GLSample",
                              "OpenGL Sample",
                              WS_OVERLAPPEDWINDOW,
                              CW_USEDEFAULT,
                              CW_USEDEFAULT,
                              256,
                              256,
                              NULL,
                              NULL,
                              hInstance,
                              NULL);

        ShowWindow(hwnd, nCmdShow);

        /* enable OpenGL for the window */
        EnableOpenGL(hwnd, &hDC, &hRC);

        /* program main loop */
        while (!bQuit)
            {
                /* check for messages */
                if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
                    {
                        /* handle or dispatch messages */
                        if (msg.message == WM_QUIT)
                            {
                                bQuit = TRUE;
                            }
                        else
                            {
                                TranslateMessage(&msg);
                                DispatchMessage(&msg);
                            }
                    }
                else
                    {
                        /* OpenGL animation code goes here */

                        glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
                        glClear(GL_COLOR_BUFFER_BIT);

                        glPushMatrix();
                        glRotatef(theta, 0.0f, 0.0f, 1.0f);
                        //glRotatef(theta, 1.0f, 1.0f, 1.0f);

                        glBegin(GL_TRIANGLES);

                            glColor3f(1.0f, 0.0f, 0.0f);   glVertex2f(0.0f,   1.0f);
                            glColor3f(0.0f, 1.0f, 0.0f);   glVertex2f(0.87f,  -0.5f);
                            glColor3f(0.0f, 0.0f, 1.0f);   glVertex2f(-0.87f, -0.5f);

                        glEnd();

                        glPopMatrix();

                        SwapBuffers(hDC);

                        theta += 1.0f;
                        Sleep (1);
                    }
            }

        /* shutdown OpenGL */
        DisableOpenGL(hwnd, hDC, hRC);

        /* destroy the window explicitly */
        DestroyWindow(hwnd);

        return msg.wParam;
    }

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
    {
        switch (uMsg)
        {
            case WM_CLOSE:
                {
                    PostQuitMessage(0);
                }
                break;

            case WM_DESTROY:
                {
                    return 0;
                }

            case WM_KEYDOWN:
                {
                    switch (wParam)
                        {
                            case VK_ESCAPE:
                                {
                                    PostQuitMessage(0);
                                }
                            break;
                        }
                }
            break;

            default:
                {
                    return DefWindowProc(hwnd, uMsg, wParam, lParam);
                }
        }

        return 0;
    }

void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC)
    {
        PIXELFORMATDESCRIPTOR pfd;

        int iFormat;

        /* get the device context (DC) */
        *hDC = GetDC(hwnd);

        /* set the pixel format for the DC */
        ZeroMemory(&pfd, sizeof(pfd));

        pfd.nSize = sizeof(pfd);
        pfd.nVersion = 1;
        pfd.dwFlags = PFD_DRAW_TO_WINDOW |
                      PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
        pfd.iPixelType = PFD_TYPE_RGBA;
        pfd.cColorBits = 24;
        pfd.cDepthBits = 16;
        pfd.iLayerType = PFD_MAIN_PLANE;

        iFormat = ChoosePixelFormat(*hDC, &pfd);

        SetPixelFormat(*hDC, iFormat, &pfd);

        /* create and enable the render context (RC) */
        *hRC = wglCreateContext(*hDC);

        wglMakeCurrent(*hDC, *hRC);
    }

void DisableOpenGL (HWND hwnd, HDC hDC, HGLRC hRC)
    {
        wglMakeCurrent(NULL, NULL);
        wglDeleteContext(hRC);
        ReleaseDC(hwnd, hDC);
    }