2D Game Development 2D Game Optimization and Performance 2

Question 1

What is the benefit of using a fixed-timestep update loop in a 2D game?

Accepted Answer

It makes physics and game logic deterministic and independent of rendering frame rate

Answer

A fixed timestep ensures physics and game logic always advance by the same delta time, making simulations reproducible and preventing instability caused by variable frame times.

Question 2

Which approach best reduces CPU overhead when updating hundreds of similar game entities each frame?

Accepted Answer

Using a Data-Oriented Design (DOD) approach with structs-of-arrays for cache-friendly iteration

Answer

Structs-of-arrays layout keeps the same field type for all entities contiguous in memory, maximizing CPU cache utilization and SIMD vectorization opportunities during mass updates.

Question 3

In 2D games, 'batching' render calls means:

Accepted Answer

Combining multiple sprite draw operations into a single GPU draw call when they share a texture and shader

Answer

Batching merges sprites that share the same texture and material into one draw call, dramatically reducing CPU-to-GPU command overhead.

Question 4

What problem does mipmapping solve in 2D games that use camera zoom-out?

Accepted Answer

It reduces aliasing and texture cache misses when sprites are rendered smaller than their native resolution

Answer

Mipmaps are pre-downscaled versions of a texture; the GPU samples the appropriately sized mip level when a sprite appears small on screen, reducing aliasing and improving texture cache efficiency.

Question 5

Which memory layout concern is most relevant to 2D particle system performance?

Accepted Answer

Keeping particle data in contiguous arrays (SOA) to enable SIMD processing and reduce cache misses

Answer

Struct-of-Arrays layout for particle positions, velocities, and lifetimes enables vectorized (SIMD) updates and keeps accessed data contiguous in the CPU cache.

2D Game Development Practice Test

2D Game Development Practice Test

2D Game Development 2D Game Optimization and Performance 2