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  • Your email address will not be published.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

  • Learn How A Global Entertainment Company Saw a 448% ROI Every business today uses software to manage systems, deliver products, and empower employees to do their jobs. But software inevitably breaks, and when it does, businesses lose money -- in the form of dissatisfied customers, missed SLAs or lost productivity. PagerDuty, an operations performance platform, solves this problem by helping operations engineers and developers more effectively manage and resolve incidents across a company's global operations. …

  • Live Event Date: December 18, 2014 @ 2:00 p.m. ET / 11:00 a.m. PT The Internet of Things (IoT) incorporates physical devices into business processes using predictive analytics. While it relies heavily on existing Internet technologies, it differs by including physical devices, specialized protocols, physical analytics, and a unique partner network. To capture the real business value of IoT, the industry must move beyond customized projects to general patterns and platforms. Check out this upcoming webcast …

Most Popular Programming Stories

More for Developers

RSS Feeds