An open source, cross-platform, OpenGL tutor.

Main Window

Below is a screenshot of Glitch. Click on one of the circled numbers to find out more about a given part of the main window.

1. World Space Viewer

Provides more insight on the scene, as it enables you to visually observe the projection frustum and to interact with it, so that you can see the scene from a different angle

Please see World Space Viewer for more details.


2. Screen Space Viewer

Displays the direct scene output, exactly as you would see it if you had written and compiled the program yourself.


3. Documentation Tab

This tab contains the Documentation Browser.

4. Program Mode Tab

This tab enables you to change the program mode into step mode, and provides the controls and feedback information to go with it.

Please see Step Mode for more details.


5. Documentation Browser

This browser contains rich-text, which is used to provide instructions or other information to the user. This text belongs to the current project and may be modified via the project properties dialog, which can be found by clicking File -> Properties...

Please see Project Properties for more details.


6. Variables Instances

This tab contains a table of variable instances that are in use by the commands in the initialization and display sections. Hence, they are created and destroyed automatically when the commands that own them are themselves created and destroyed.

The variables can be selected and modified here. Though, to edit the name of a variable, you will need to locate the actual command that uses it and then edit the name where it is given as a parameter. The variable instance table will be updated to reflect any changes.

Note that the insert, remove, up and down command manipulator button will all be disabled when this tab page is selected.


7. Initialization Commands

This tab contains a table of commands that are to be executed in the initialization section of the OpenGL scene, such as glEnable calls.

Commands can be inserted, removed, moved up, moved down or manipulated.

Once a command has been selected, it can be manipulated. The command can be enabled / disabled, by checking / un-checking the check box that appears at the front of the command. The function that the command is representing can be changed by clicking on the button that is labeled with current function's name (e.g. "glMatrixMode...") and then choosing a different one from the hierarchical list that will pop-up. The parameters may also be edited here.

The OpenGL scene viewers will be updated instantly when any modifications are made.

If the command requires any variable instances, then it / they will be created automatically.

Please see Variable Instances (above) for more details.


8. Display Commands

This tab contains a table of commands that are to be executed in the display section of the OpenGL scene, such as those which actually draw the scene.

Please see Initialization Commands (above) for more details.

The commands in this section can be stepped through, one-by-one, similar in behavior to a debugger. Please see Step Mode for more details.


9. Insert Command Button

Insert a new command into either the initialization or display table, which ever is selected.
It will be inserted directly below the currently selected row, where one already exists.

If the new command requires any variable instances, then it / they will be created automatically.


10. Remove Command Button

Remove the currently selected command from either the initialization or display table, which ever is selected.

If the command used any variable instances, then it / they will be destroyed automatically.


11. Move Command Up Button

Move the currently selected command up, if possible.


12. Move Command Down Button

Move the currently selected command down, if possible.