2D Game Development 2D Game Optimization and Performance

Question 1

What is the primary purpose of a texture atlas (sprite sheet) in 2D game optimization?

Accepted Answer

To reduce draw calls by batching multiple textures into a single GPU bind

Answer

To increase the color depth of sprites

Answer

To enable procedural texture generation at runtime

Answer

To store collision data alongside sprite pixels

Question 2

Which rendering technique minimizes overdraw in a 2D game scene?

Accepted Answer

Drawing opaque sprites front-to-back so the depth buffer rejects hidden pixels early

Answer

Drawing sprites in back-to-front (painter's algorithm) order only

Answer

Using additive blending for all sprites

Answer

Rendering all sprites at half resolution then upscaling

Question 3

What does 'object pooling' solve in 2D game performance?

Accepted Answer

It avoids frequent heap allocations and garbage collection spikes by reusing objects

Answer

It reduces texture memory usage by sharing sprites between objects

Answer

It groups game objects into spatial pools for faster physics

Answer

It batches audio sources to reduce CPU audio thread load

Question 4

In a 2D game, a 'dirty flag' pattern is most useful for:

Accepted Answer

Avoiding redundant transform recalculations on objects that haven't moved

Answer

Marking sprites that need re-rendering after a physics update

Answer

Flagging corrupted save data for recovery

Answer

Tracking which tiles have been visited by the player

Question 5

What is the main advantage of using a quadtree in a 2D game?

Accepted Answer

It partitions space to speed up spatial queries like collision broad-phase detection

Answer

It stores tile UV coordinates for fast texture lookup

Answer

It compresses sprite animation data for faster streaming

Answer

It balances load across multiple CPU cores

Question 6

Which metric most directly measures whether a 2D game is GPU-bound vs. CPU-bound?

Accepted Answer

GPU frame time vs. CPU frame time per frame in a profiler

Answer

Total RAM usage reported by the OS

Answer

Number of active game objects in the scene

Answer

Texture resolution of the largest sprite in memory

Question 7

What is 'frustum culling' adapted to in a 2D game context?

Accepted Answer

Skipping rendering of sprites whose bounding rectangles lie entirely outside the camera viewport

Answer

Removing vertices outside the camera frustum before rasterization

Answer

Cutting audio sources that are outside the audible range of the player

Answer

Disabling physics on objects beyond a certain distance from the origin