drmkit-gbm

GBM buffer allocation.

A thin layer over libgbm, in the shape the rest of drmkit expects: errors as a typed enum, formats as drmkit FourCCs, and a buffer that hands out the descriptor a scanout path needs.

GBM is how a GPU-rendered surface becomes something KMS can scan out. Where drmkit-dumb allocates plain linear memory the CPU writes, this asks the driver for memory its renderer can target — which on real hardware means tiled or compressed layouts, and a modifier saying which.

On a driver with no render engine the drm backend falls back to dumb allocation, so this still works against vkms: linear, one plane, and a dma-buf that exports. That is what makes it testable without a GPU.

Part of drmkit, a Rust port of drm-cxx. API documentation is on docs.rs.

License

MIT, matching drm-cxx.