Lesson01: Initializing OpenGL Context

Overview 

This post discusses  implementing the basic operations of creating a hosting window, Initializing it with OpenGL context, rendering and handle mouse/keyboard inputs. 

Details

This purpose of  Lesson01 is to create a Host Window, initialized with OpenGL context and fill it  with fuchsia color.

System  class diagram

The functionality is implemented in the Scene class derived from BaseScene class.

Implementation

Scene

The three methods Init,DrawScene and Cleanup are overridden as below.

The Init method calls BaseScene::Init to create hosting window and OpenGL Context.

The DrawScene method clears the window and paints it with fuchsia color.

The Cleanup method does not do anything.

The BaseCamera::camera is not initialized and stays as nullptr hence no keyboard or mouse inputs are processed other than Escape key.

Finally, the WM_CLOSE  event is handled in OnCloseWindow function, and the window is destroyed and application is shutdown when the window is closed or Escape key is pressed. 

Application

Scene class is hosted main.cpp. which creates the scene object and displays it. Message pump is added to process windows messages.

Output

The output looks as shown in the top.

The Source Code can be accessed from Lesson01 Initializing OpenGL Context

The binaries can be accessed from here.