Main Loop and Frame Rate

[sholloway]

Ensure a stable frame rate.

Goals

• Need a budget based approach to frame design.
• Don't maximize the CPU.
• Avoid sleeping threads.
• The frame rate should be appropriate for the screen display. Typically 60 FPS.
• Event driven rather than looping and calling updates on everything.

Tasks

• [x] Create a scheduler that can invoke callbacks based on time target.
• [x] Create a priority queue to enable scheduling.
• [x] Support a smooth, steady frame rate.
• [x] Display the active FPS in a simulation window.
• [ ] Resources
• Game Programming Patterns: Game Loop
• When should I use Fixed or Variable Time Step
• Efficient Event-based Simulations
• Fix your time step
• CPU Slicing