forge-atlas-rendering

Remapping UVs to a single texture atlas reduces texture binds in SDL GPU projects by replacing multiple material textures with one atlas. The fragment shader uses per-entry UV transforms and atlas metadata offsets to sample the correct region.

Atlas UV remapping for real-time rendering is the process of mapping multiple materials onto a single atlas texture. It applies per-object UV transforms in the fragment shader using metadata offsets and scales, enabling single-texture sampling instead of swapping textures per object.

To sample a specific material region from a texture atlas in a fragment shader, you load atlas metadata containing offsets and scales, then apply per-object UV transforms. This remaps the original UV coordinates to the correct sub-region within the single bound atlas texture.

Yes, single-texture sampling in SDL GPU requires loading atlas metadata from an atlas.json file via the forge_pipeline_load_atlas function. This metadata provides the per-entry UV transform data, such as offsets and scales, needed for the fragment shader to sample the correct atlas region.

Yes, you can use a texture atlas to reduce draw calls in an SDL GPU scene with many objects. By packing multiple materials into one atlas and remapping UVs in the fragment shader, you avoid swapping textures per object, significantly reducing texture binds.

A limitation of using a single atlas texture for all materials in SDL GPU is the requirement for precise atlas metadata. You must provide accurate per-entry UV transform data for shader sampling, and all materials must be packed into the atlas prior to rendering.