How do you make a loading bar?

All loading bars to is present the internal state of the program to the player. Store the percentage of completion in a variable somewhere and then read this when your rendering the bar to see how much you should fill in.

Make a texture for your loading bar and then when drawing it, multiply the width of the bar at 100% completion by the current percentage. Like so:

[source lang="csharp"]Texture loadingTexture = LoadTexture("loadingBar");

float completionPercent = loader.PercentComplete;

Draw(loadingTexture, x, y, loadingTexture.Width * completionPercent, loadingTexture.Height);[/source]