OpenGL enabled view for MDI

WEBINAR: On-demand webcast

How to Boost Database Development Productivity on Linux, Docker, and Kubernetes with Microsoft SQL Server 2017 REGISTER >

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

  • As all sorts of data becomes available for storage, analysis and retrieval - so called 'Big Data' - there are potentially huge benefits, but equally huge challenges...
  • The agile organization needs knowledge to act on, quickly and effectively. Though many organizations are clamouring for "Big Data", not nearly as many know what to do with it...
  • Cloud-based integration solutions can be confusing. Adding to the confusion are the multiple ways IT departments can deliver such integration...

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date