ffv1enc: add a Vulkan encoder

This commit implements a standard, compliant, version 3 and version 4
FFv1 encoder, entirely in Vulkan. The encoder is written in standard
GLSL and requires a Vulkan 1.3 supporting GPU with the BDA extension.

The encoder can use any amount of slices, but nominally, should use
32x32 slices (1024 in total) to maximize parallelism.

All features are supported, as well as all pixel formats.
This includes:
 - Rice
 - Range coding with a custom quantization table
 - PCM encoding

CRC calculation is also massively parallelized on the GPU.

Encoding of unaligned dimensions on subsampled data requires
version 4, or requires oversizing the image to 64-pixel alignment
and cropping out the padding via container flags.

Performance-wise, this makes 1080p real-time screen capture possible
at 60fps on even modest GPUs.

0 files changed, 0 insertions, 0 deletions