OpenGL enabled view for MDI

Introduction

CGEnabledView is a view class designed to wrap all OpenGL stuff (initialization, managing of Rendering Contexts and palettes, destruction, etc.) allowing the creation of multiple views in a MDI application.
CGEnabledView also offers these services:

  • a function to get various information about OpenGL implementation.
  • manages internally the creation of up to 20 stock display list and offers a basic interface for display list creation, execution and deletion (this function has been surpassed by CGLDispList child class,see below).
  • let you choose a mouse cursor to use inside the views.

Three child classes offer an object oriented interface to OpenGL tessellation routines, quadrics objects and display lists:

  1. CGLDispList: let you manage display lists individually.
  2. CGLTesselator: let you create tesselator objects by which draw non simple polygons (that is convex or self intersecting ones).
  3. CGLQuadric: let you draw spheres, cylinders and disks specifying draw style, textures coordinates generation, normals generation and orientation.

Basic Use

The minimal setup to start experimenting OpenGL drawing is as follows:
  1. Use AppWizard to geneate an MDI project.
  2. Substitute CView with CGLEnabledView in [YourProject]View.cpp and [YourProject]View.h.
  3. Use ClassWizard to remove the OnDraw and PreCreateWindow functions (delete the bodies too).
  4. Override the VideoMode function if you would like to set the number of colors, the accuracy of the Z-buffer (note that some accelerated video cards don't support 32 bit accurate z-buffer) and activation of double-buffer.
  5. Override the OnDrawGL function and issue some GL commands.
  6. If you must issue GL commands outside overridable functions (e.g. in menu handlers) enclose them in a BeginGLCommands(), EndGLCommands() pair.
Remember to link OpenGL libraries (look at the beginning of GLEnabledView.cpp for explanations). Other details are in the sample project and in the source (wich should be well commented).

Notes

Since it's not adviseable to mix Windows GDI and OpenGL drawing commands some WM message handlers have been made private, use the supplied overridable virtual functions instead (OnDrawGL,OnSizeGL and OnCreateGL).

Download demo project - 133KB

Download source - 13KB

Date Posted: ??/??/98



Comments

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • On-demand Event Event Date: September 10, 2014 Modern mobile applications connect systems-of-engagement (mobile apps) with systems-of-record (traditional IT) to deliver new and innovative business value. But the lifecycle for development of mobile apps is also new and different. Emerging trends in mobile development call for faster delivery of incremental features, coupled with feedback from the users of the app "in the wild." This loop of continuous delivery and continuous feedback is how the best mobile …

  • On-demand Event Event Date: July 22, 2014 In this WhatWorks analysis, John Pescatore examines a use case where end users had local administrative rights on their PCs and it had gotten out of hand for this Fortune 500 Energy and Utilities company. The compelling event that prompted the company to reexamine this situation was the migration to Windows 7. In Windows XP, a custom tool that allowed users one of three levels of administrative rights to their workstations would need to be replaced during the Windows …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds