What is the primary benefit of texture atlasing in rendering?

• A. Reduces draw calls by packing multiple textures into a single atlas, decreasing state changes and memory usage
• B. Increases memory usage significantly
• C. Decreases texture resolution
• D. Increases draw calls

Answer: (A)

Texture atlasing packs many smaller textures into a single large image, so rendering can sample different parts of that one texture without switching textures each time. The main benefit is fewer texture bindings, which reduces state changes and draw calls. When a single bound texture is used to draw many objects by sampling different regions, the GPU spends less time switching textures and can push more geometry per frame, boosting performance. This approach can also trim memory usage by avoiding duplicate texture data when multiple objects share the same image, though the atlas itself may include empty space if not packed perfectly. The other options don’t fit: atlasing does not inherently increase draw calls, nor does it automatically decrease texture resolution, and it isn’t primarily about increasing memory usage.