Open GBM main device

Not yet used.

Cargo.lock

@@ -732,6 +732,7 @@ dependencies = [
  "cosmic-client-toolkit",
  "env_logger",
  "futures-channel",
+ "gbm",
  "libcosmic",
  "tokio",
  "wayland-protocols 0.31.0",
@@ -984,6 +985,41 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ea835d29036a4087793836fa931b08837ad5e957da9e23886b29586fb9b6650"
 
+[[package]]
+name = "drm"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97fb1b703ffbc7ebd216eba7900008049a56ace55580ecb2ee7fa801e8d8be87"
+dependencies = [
+ "bitflags 2.4.1",
+ "bytemuck",
+ "drm-ffi",
+ "drm-fourcc",
+ "nix 0.27.1",
+]
+
+[[package]]
+name = "drm-ffi"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba7d1c19c4b6270e89d59fb27dc6d02a317c658a8a54e54781e1db9b5947595d"
+dependencies = [
+ "drm-sys",
+ "nix 0.27.1",
+]
+
+[[package]]
+name = "drm-fourcc"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0aafbcdb8afc29c1a7ee5fbe53b5d62f4565b35a042a662ca9fecd0b54dae6f4"
+
+[[package]]
+name = "drm-sys"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3a4f1c0468062a56cd5705f1e3b5409eb286d5596a2028ec8e947595d7e715ae"
+
 [[package]]
 name = "either"
 version = "1.9.0"
@@ -1376,6 +1412,30 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "gbm"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57c97c1672f2d951da311cd20b148794c4157a8879c7650e65f76c7826e2b1c1"
+dependencies = [
+ "bitflags 1.3.2",
+ "drm",
+ "drm-fourcc",
+ "gbm-sys",
+ "libc",
+ "wayland-backend 0.3.2",
+ "wayland-server",
+]
+
+[[package]]
+name = "gbm-sys"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b63eba9b9b7a231514482deb08759301c9f9f049ac6869403f381834ebfeaf67"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "generic-array"
 version = "0.14.7"
@@ -1989,9 +2049,9 @@ checksum = "03087c2bad5e1034e8cace5926dec053fb3790248370865f5117a7d0213354c8"
 
 [[package]]
 name = "libc"
-version = "0.2.149"
+version = "0.2.150"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a08173bc88b7955d1b3145aa561539096c421ac8debde8cbc3612ec635fee29b"
+checksum = "89d92a4743f9a61002fae18374ed11e7973f530cb3a3255fb354818118b2203c"
 
 [[package]]
 name = "libcosmic"
@@ -2344,6 +2404,17 @@ dependencies = [
  "pin-utils",
 ]
 
+[[package]]
+name = "nix"
+version = "0.27.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2eb04e9c688eff1c89d72b407f168cf79bb9e867a9d3323ed6c01519eb9cc053"
+dependencies = [
+ "bitflags 2.4.1",
+ "cfg-if",
+ "libc",
+]
+
 [[package]]
 name = "nom"
 version = "7.1.3"
@@ -4186,7 +4257,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "15a0c8eaff5216d07f226cb7a549159267f3467b289d9a2e52fd3ef5aae2b7af"
 dependencies = [
  "dlib",
+ "libc",
  "log",
+ "memoffset 0.9.0",
  "pkg-config",
 ]
 

Cargo.toml

@@ -8,6 +8,7 @@ calloop = "0.12.3"
 cctk = { package = "cosmic-client-toolkit", git = "https://github.com/pop-os/cosmic-protocols" }
 env_logger = "0.10.0"
 futures-channel = "0.3.25"
+gbm = "0.13.0"
 libcosmic = { git = "https://github.com/pop-os/libcosmic", default-features = false, features = ["tokio", "wayland"] }
 tokio = "1.23.0"
 wayland-protocols = "0.31.0"

src/wayland/dmabuf.rs

@@ -6,6 +6,8 @@ use cctk::{
     wayland_client::{protocol::wl_buffer, Connection, QueueHandle},
 };
 
+use std::{fs, io, os::unix::fs::MetadataExt};
+
 use wayland_protocols::wp::linux_dmabuf::zv1::client::{
     zwp_linux_buffer_params_v1::ZwpLinuxBufferParamsV1,
     zwp_linux_dmabuf_feedback_v1::ZwpLinuxDmabufFeedbackV1,
@@ -24,6 +26,19 @@ impl DmabufHandler for AppData {
         _proxy: &ZwpLinuxDmabufFeedbackV1,
         feedback: DmabufFeedback,
     ) {
+        if self.gbm.is_none() {
+            match find_gbm_device(feedback.main_device() as u64) {
+                Ok(Some(gbm)) => {
+                    self.gbm = Some(gbm);
+                }
+                Ok(None) => {
+                    eprintln!("Gbm main device '{}' not found", feedback.main_device());
+                }
+                Err(err) => {
+                    eprintln!("Failed to open gbm main device: {}", err);
+                }
+            }
+        }
         self.dmabuf_feedback = Some(feedback);
     }
     fn created(
@@ -50,4 +65,16 @@ impl DmabufHandler for AppData {
     }
 }
 
+fn find_gbm_device(dev: u64) -> io::Result<Option<gbm::Device<fs::File>>> {
+    for i in std::fs::read_dir("/dev/dri")? {
+        let i = i?;
+        if i.metadata()?.rdev() == dev {
+            let file = fs::File::options().read(true).write(true).open(i.path())?;
+            eprintln!("Opened gbm main device '{}'", i.path().display());
+            return Ok(Some(gbm::Device::new(file)?));
+        }
+    }
+    Ok(None)
+}
+
 sctk::delegate_dmabuf!(AppData);

src/wayland/mod.rs

@@ -39,6 +39,7 @@ use futures_channel::mpsc;
 use std::{
     cell::RefCell,
     collections::{HashMap, HashSet},
+    fs,
     sync::Arc,
     thread,
 };
@@ -107,6 +108,7 @@ pub struct AppData {
     capture_filter: CaptureFilter,
     captures: RefCell<HashMap<CaptureSource, Arc<Capture>>>,
     dmabuf_feedback: Option<DmabufFeedback>,
+    gbm: Option<gbm::Device<fs::File>>,
 }
 
 impl AppData {
@@ -247,6 +249,7 @@ fn start(conn: Connection) -> mpsc::Receiver<Event> {
         capture_filter: CaptureFilter::default(),
         captures: RefCell::new(HashMap::new()),
         dmabuf_feedback: None,
+        gbm: None,
     };
 
     app_data.send_event(Event::Seats(app_data.seat_state.seats().collect()));