gallium: add renderonly library
This a very lightweight library to add basic support for renderonly
GPUs. A kms gallium driver must specify how a renderonly_scanout
objects gets created. Also it must provide file handles to the used
kms device and the used gpu device.
This could look like:
struct renderonly ro = {
.create_for_resource = renderonly_create_gpu_import_for_resource,
.kms_fd = fd,
.gpu_fd = open("/dev/dri/renderD128", O_RDWR | O_CLOEXEC)
};
The renderonly_scanout object exits for two reasons:
- Do any special treatment for a scanout resource like importing the
GPU resource into the scanout hw.
- Make it easier for a gallium driver to detect if anything special
needs to be done in flush_resource(..) like a resolve to linear.
A GPU gallium driver which gets used as renderonly GPU needs to be
aware of the renderonly library.
This library will likely break android support and hopefully will get
replaced with a better solution based on gbm2.
Changes from V1 -> V2:
- reworked the lifecycle of renderonly object (suggested by Nicolai Hähnle)
- killed the midlayer (suggested by Thierry Reding)
- made the API more explicit regarding gpu and kms fd's
- added some docs
Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Acked-by: Emil Velikov <emil.velikov@collabora.com>
Tested-by: Alexandre Courbot <acourbot@nvidia.com>
5 files changed