58 lines
1.7 KiB
Rust
58 lines
1.7 KiB
Rust
use {
|
|
crate::{gfx_api::GfxContext, utils::oserror::OsError},
|
|
byteorder::{NativeEndian, WriteBytesExt},
|
|
std::{io::Write, rc::Rc},
|
|
thiserror::Error,
|
|
uapi::{c, OwnedFd},
|
|
};
|
|
|
|
pub struct DrmFeedback {
|
|
pub fd: Rc<OwnedFd>,
|
|
pub size: usize,
|
|
pub indices: Vec<u16>,
|
|
pub main_device: c::dev_t,
|
|
}
|
|
|
|
impl DrmFeedback {
|
|
pub fn new(ctx: &dyn GfxContext) -> Result<Self, DrmFeedbackError> {
|
|
let dev_t = uapi::fstat(ctx.gbm().drm.raw())
|
|
.map_err(OsError::from)?
|
|
.st_rdev;
|
|
let data = create_fd_data(ctx);
|
|
let mut memfd =
|
|
uapi::memfd_create("drm_feedback", c::MFD_CLOEXEC | c::MFD_ALLOW_SEALING).unwrap();
|
|
memfd.write_all(&data).unwrap();
|
|
uapi::lseek(memfd.raw(), 0, c::SEEK_SET).unwrap();
|
|
uapi::fcntl_add_seals(
|
|
memfd.raw(),
|
|
c::F_SEAL_SEAL | c::F_SEAL_GROW | c::F_SEAL_SHRINK | c::F_SEAL_WRITE,
|
|
)
|
|
.unwrap();
|
|
let num_indices = data.len() / 16;
|
|
let indices = (0..num_indices).map(|v| v as u16).collect();
|
|
Ok(Self {
|
|
fd: Rc::new(memfd),
|
|
size: data.len(),
|
|
indices,
|
|
main_device: dev_t,
|
|
})
|
|
}
|
|
}
|
|
|
|
fn create_fd_data(ctx: &dyn GfxContext) -> Vec<u8> {
|
|
let mut vec = vec![];
|
|
for (format, info) in &*ctx.formats() {
|
|
for modifier in &info.read_modifiers {
|
|
vec.write_u32::<NativeEndian>(*format).unwrap();
|
|
vec.write_u32::<NativeEndian>(0).unwrap();
|
|
vec.write_u64::<NativeEndian>(*modifier).unwrap();
|
|
}
|
|
}
|
|
vec
|
|
}
|
|
|
|
#[derive(Debug, Error)]
|
|
pub enum DrmFeedbackError {
|
|
#[error("Could not stat drm device")]
|
|
Stat(#[from] OsError),
|
|
}
|